tag:blogger.com,1999:blog-79231712101203105632024-03-06T11:03:30.513+05:30Plus Two PhysicsFree Help in PhysicsUnknownnoreply@blogger.comBlogger898125tag:blogger.com,1999:blog-7923171210120310563.post-58829072068437076362016-03-05T13:00:00.000+05:302016-03-05T13:00:16.764+05:30How was CBSE Physics question paper<div dir="ltr" style="text-align: left;" trbidi="on">
Hello everyone! Today CBSE conducted Physics exam. How was the question paper? Was it easy, tough or very tough ? <br />
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Just speak out your reactions. The more people react in case of any trouble the more benefit you will be getting in valuation. Let us know the problems faced by the students and we can also inform through several media about the problems faced by the students to CBSE. So leave your problems and suggestions as comments to this post.</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-74792368450717665902016-03-04T15:55:00.000+05:302016-03-04T15:55:01.455+05:30How was your CBSE Business Studies paper 2016?<div dir="ltr" style="text-align: left;" trbidi="on">
Many said complaints about the business Studies paper this year. What's your opinion?</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-61989577866003541272015-03-21T06:05:00.001+05:302015-03-21T06:05:45.404+05:30How was class 10 and 12 mathematics question paper cbse<p dir="ltr">Many commented that mathematics exam class 10 and class 12 was difficult. How did you feel?</p>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-87967283282845342452015-03-15T19:10:00.000+05:302015-03-15T19:28:50.715+05:30Chapter wise solutions to H C Verma’s Concepts of Physics Part 1<div dir="ltr" style="text-align: left;" trbidi="on">
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Problems from <strong>H C Verma</strong>‘s <strong>Concepts of Physics</strong> is considered a must work out assignment by most of the <strong>IIT </strong>aspirants.</div>
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Here you can find the solutions to the problems chapterwise. The downloads are based on the old edition of HC Verma’s Concepts of Physics. In case the book is revised, the answers and solutions may not match. Students will have to use your senses to find out. We cannot reproduce the questions for reasons known to all.</div>
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If you donot have a copy of HC Verma’s concepts of Physics, <strong style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;"><a href="http://www.flipkart.com/concepts-physics-set-2-volume/p/itmdepgn3pgefp4g?pid=9785111128705&affid=anitha1231" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="Buy HC Verma's Concepts of Physics Online - Lowest Price on net">Buy it here at the lowest price.</a> </strong></div>
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The solutions can be downloaded in pdf format by clicking on the links below.</div>
<ol style="background-color: white; border: 0px; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 18px; margin: 0px 0px 5px; overflow: auto; padding: 0px; vertical-align: baseline; zoom: 1;">
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/01.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 1">CHAPTER 1</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/03/02.SOLUTIONSTOCONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 2">CHAPTER 2</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/03.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 3">CHAPTER 3</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/04.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 4">CHAPTER 4</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/05.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 5">CHAPTER 5<a name='more'></a></a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/06.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 6">CHAPTER 6</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/07.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 7">CHAPTER 7</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/08.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 8">CHAPTER 8</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/09.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 9">CHAPTER 9</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/10.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 10">CHAPTER 10</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/11.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 11">CHAPTER 11</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/12.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 12">CHAPTER 12</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/13.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 13">CHAPTER 13</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/14.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 14">CHAPTER 14</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/15.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 15">CHAPTER 15</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/16.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 16">CHAPTER 16</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/17.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 17">CHAPTER 17</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/18.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 18">CHAPTER 18</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/19.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 19">CHAPTER 19</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/20.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 20">CHAPTER 20</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/21.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 21">CHAPTER 21</a></li>
<li style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; list-style-type: decimal; margin: 0px 0px 0px 2em; padding: 0px; vertical-align: baseline;"><a href="http://plustwophysics.com/wp-content/uploads/2010/02/22.SOLUTIONS-TO-CONCEPTS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 22">CHAPTER 22</a></li>
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<strong><a href="http://blog.plustwophysics.com/2015/03/solutions-to-hc-vermas-concepts-of_15.html" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_self" title="H C VERMA PART II">SEE PART TWO FOR MORE</a></strong></div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-54864922685570702312015-03-15T19:02:00.000+05:302015-03-15T19:29:01.890+05:30Solutions to HC Verma's Concepts of Physics :: PART II<div dir="ltr" style="text-align: left;" trbidi="on">
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CHAPTER <a href="http://plustwophysics.com/wp-content/uploads/2010/02/23.HEAT-AND-TEMPERATURE.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="23.HEAT AND TEMPERATURE">23.HEAT AND TEMPERATURE</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/24.KINETIC-THEORY-OF-GASES.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 24.KINETIC THEORY OF GASES">CHAPTER 24.KINETIC THEORY OF GASES</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/25.CALORIMETRY.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 25.CALORIMETRY">CHAPTER 25.CALORIMETRY</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/26.LAWS-OF-THERMODYNAMICS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 26.LAWS OF THERMODYNAMICS">CHAPTER 26.LAWS OF THERMODYNAMICS</a><br />
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/27.SPECIFIC-HEAT-CAPACITIES-OF-GASES.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="CHAPTER 27.SPECIFIC HEAT CAPACITIES OF GASES">CHAPTER 27.SPECIFIC HEAT CAPACITIES OF GASES</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/27.SPECIFIC-HEAT-CAPACITIES-OF-GASES2.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="27.SPECIFIC HEAT CAPACITIES OF GASES(2)">27.SPECIFIC HEAT CAPACITIES OF GASES(2)</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/28.HEAT-TRANSFER.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="28.HEAT TRANSFER">28.HEAT TRANSFER</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/29.ELECTRIC-FIELD-AND-POTENTIAL.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="29.ELECTRIC FIELD AND POTENTIAL">29.ELECTRIC FIELD AND POTENTIAL</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/30.GAUSSS-LAW.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="30.GAUSS’S LAW">30.GAUSS’S LAW</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/31.CAPACITOR.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="31.CAPACITOR">31.CAPACITOR</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/32.Electric-current-in-conductors.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="32.Electric current in conductors">32.Electric current in conductors</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/33.ELECTRIC-CURRENT.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="33.ELECTRIC CURRENT">33.ELECTRIC CURRENT</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/34.MAGNETIC-FIELD.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="34.MAGNETIC FIELD">34.MAGNETIC FIELD</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/35.-MAGNETIC-FIELD-DUE-TO-CURRENT.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="35. MAGNETIC FIELD DUE TO CURRENT">35. MAGNETIC FIELD DUE TO CURRENT</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/36.PERMANENT-MAGNETS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="36.PERMANENT MAGNETS">36.PERMANENT MAGNETS</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/37.MAGNETIC-PROPERTIES-OF-MATTER.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="37.MAGNETIC PROPERTIES OF MATTER">37.MAGNETIC PROPERTIES OF MATTER</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/38.Electromagnetic-induction.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="38.Electromagnetic induction">38.Electromagnetic induction</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/39.Alternating-current.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="39.Alternating current">39.Alternating current</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/40.Electromagnetic-waves.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="40.Electromagnetic waves">40.Electromagnetic waves</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/41.electric-current-through-gases.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="41.electric current through gases">41.electric current through gases</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/42.photo-electric-effect.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="42.photo electric effect">42.photo electric effect</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/43.Bohrs-theory-and-physics-of-atom.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="43.Bohr’s theory and physics of atom">43.Bohr’s theory and physics of atom</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/44.X-RAYS.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="44.X-RAYS">44.X-RAYS</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/45.Semiconductor-and-semiconductor-devices.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="45.Semiconductor and semiconductor devices">45.Semiconductor and semiconductor devices</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/46.The-Nucleus.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="46.The Nucleus">46.The Nucleus</a></div>
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<a href="http://plustwophysics.com/wp-content/uploads/2010/02/47.The-special-theory-of-relativity.pdf" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="47.The special theory of relativity">47.The special theory of relativity</a></div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-39331698633907460682015-03-15T18:06:00.000+05:302015-03-15T19:29:12.820+05:30Rotational Mechanics – HC Verma’s Concepts of Physics – Solution<div dir="ltr" style="text-align: left;" trbidi="on">
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<strong>HC Verma’s Concepts of Physics - Chapter 10 - Question 15</strong></div>
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Find the moment of inertia of a uniform square plate of mass <strong>m</strong> and edge <strong>a</strong> about one of its diagonals.</div>
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The question was posted by Ankit</div>
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Solution:</div>
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Let the moment of inertia about the axis through the centre of the square plate perpendicular to the plane, assumed to be along Z axis, be I. Now the square plate will be in the XY plane. Let the X axis and Y axis be parallel to the edges and passing through the centre.</div>
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Then, we know that Ix = Iy = ma<sup style="line-height: 0;">2</sup>/12</div>
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Then, according to perpendicular axis theorem,<br />
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Iz = Ix + Iy = 2Ix=2ma<sup style="line-height: 0;">2</sup>/12=ma<sup style="line-height: 0;">2</sup>/6</div>
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Now, imagine that X and Y axes are along the diagonals. (The diagonals of a square are also mutually perpendicular.)</div>
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Again, according to perpendicular axis theorem, Iz = Ix + Iy = 2Ix</div>
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The MI about the diagonal about its diagonal, Ix = Iz/2 = <strong>ma<sup style="line-height: 0;">2</sup>/12</strong></div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-16548132025997047502015-03-15T18:04:00.000+05:302015-03-15T19:29:35.037+05:30Solutions to HC Verma’s Concepts of Physics – Weblinks<div dir="ltr" style="text-align: left;" trbidi="on">
We found the following website links which offer solutions to HC Verma’s Concepts of Physics.<br />
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Though there are some errors and omissions, these links will help at least get ideas which lead towards the solution. Students are advised to try to solve the problems themselves and consult the solution only if they are not getting the correct answer. Please satisfy your own knowledge and understanding before believing on any online solutions.<br />
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Please bring to our notice if you find any error in these online solutions.<br />
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Weblinks for Solutions to H C Verma’s Concepts of Physics<br />
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<ol style="text-align: left;">
<li><a href="http://www.scribd.com/doc/52121841/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-5">http://www.scribd.com/doc/52121841/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-5<a name='more'></a></a></li>
<li><a href="http://www.scribd.com/doc/61351669/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-6">http://www.scribd.com/doc/61351669/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-6</a></li>
<li><a href="http://www.scribd.com/doc/61351011/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-8">http://www.scribd.com/doc/61351011/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-8</a></li>
<li><a href="http://www.scribd.com/doc/43123490/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-10">http://www.scribd.com/doc/43123490/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-10</a></li>
<li><a href="http://www.scribd.com/doc/49080270/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-12">http://www.scribd.com/doc/49080270/Solutions-to-Concepts-of-Physics-by-HC-Verma-Chapter-12</a></li>
<li><a href="https://sites.google.com/site/physicsclassroomonline/h-c-verma-concepts-of-physics-chapter-wise-solutions">https://sites.google.com/site/physicsclassroomonline/h-c-verma-concepts-of-physics-chapter-wise-solutions</a></li>
<li><a href="http://www.youtube.com/playlist?list=PLDF8104B8EFE417FC">http://www.youtube.com/playlist?list=PLDF8104B8EFE417FC</a></li>
</ol>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-60800777342809965692015-03-15T17:57:00.000+05:302015-03-15T18:01:14.505+05:30Reference Books in Physics Suggested by CBSE for class XI and XII students<div dir="ltr" style="text-align: left;" trbidi="on">
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<i>1. </i><i style="background-color: transparent;">Fundamentals of Physics</i></div>
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- <i>David Halliday, Robert Resnick, Jearl Walker </i><i style="line-height: 1.3em;"> Asian Books Pvt. Ltd., </i><i style="line-height: 1.3em;">New Delhi</i></div>
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<i>2. </i><i><span style="border: 0px; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; text-decoration: underline; vertical-align: baseline;">Facets</span> of Physics : A conceptual Approach</i><i> </i><i style="line-height: 1.3em;"> West Publishing Company</i></div>
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<i>3. </i><i>University Physic</i></div>
<div align="left" style="background-color: white; border: 0px; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 1.3em; margin-bottom: 0.8em; padding: 0px; vertical-align: baseline;">
- <i>H.D Young, M.W.Zemansky and F.W.Sears </i><i style="line-height: 1.3em;"> Narosa Pub. House</i></div>
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<i>4. </i><i>Physics – Foundations and Frontiers</i></div>
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- <i>George Gamow and J.M.Clearland </i><i style="line-height: 1.3em;"> Tata Mcgraw Hill</i><br />
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<i>5. </i><i>College Physics</i></div>
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- <i>R L Weber, K.V Manning, M.W.White & G.A Weygard </i><i style="line-height: 1.3em;"> Tata Mcgraw Hill</i></div>
<div align="left" style="background-color: white; border: 0px; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 1.3em; margin-bottom: 0.8em; padding: 0px; vertical-align: baseline;">
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<i>6. </i><i>College Physics</i></div>
<div align="left" style="background-color: white; border: 0px; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 1.3em; margin-bottom: 0.8em; padding: 0px; vertical-align: baseline;">
- <i>Reymond A.Sarvey and Jerry S.Fanghan </i><i style="line-height: 1.3em;"> Harcourt Brace & Co.</i></div>
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<i>7. </i><i>Principles of Physics</i></div>
<div align="left" style="background-color: white; border: 0px; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 1.3em; margin-bottom: 0.8em; padding: 0px; vertical-align: baseline;">
<i> - Raymond A.Serway & John W.Jewett, Jr. </i><i style="line-height: 1.3em;"> </i></div>
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<i>8. </i><i>The Elements of Physics</i></div>
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<i> I.S Grant & W.R. Phillips</i></div>
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<i>9. </i><i>Physics can be fun</i></div>
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- <i>Y. Perelman, Mir Publishers</i></div>
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<i>10. </i><i>Advanced level Physics M.Nelkon & P.Parker</i></div>
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- <i>Arnold – Heinemann</i></div>
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<i>11. </i><i>Success in Physics – Tom Duncan</i></div>
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<i> John Murray Publications Ltd.</i></div>
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<i>12. </i><i>Success in Electronics – Tom Duncan</i></div>
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- <i>John Murray Publications Ltd.</i></div>
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<i>13. </i><i>Concepts of Physics – H.C.Verma</i></div>
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<i> Bharti Bhawan Publishers</i></div>
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<i>14. </i><i>3000 Solved Problems in Physics</i></div>
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<i> Alvin Halpern</i></div>
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<i> Schaum’s solved problem series</i></div>
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<i> Tata Mcgraw Hill</i></div>
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<i>15. </i><i>Mcgraw Hill’s Dictionary of Physics</i></div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-19848063890061274262015-03-15T17:55:00.000+05:302015-03-15T18:01:31.207+05:30How evolution has shaped our lungs? A physics perspective<div dir="ltr" style="text-align: left;" trbidi="on">
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In a study published in European Physical Journal E how evolution has shaped our lungs through successive optimizations of physical parameters such as conservation of energy and speed of delivery. Two French Physicists, Bernard Sapoval and Marcel Filoche from École Polytechnique in Palaiseau, France, are involved in the research.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhO74YOYQJte876lsdQYJdessIosomn9d18o2sbRyqVZUD-vxvGLKxepVcj-luOW3X8LewSPjmCiDxQlHNiEd1utF-ysH6URsYXJHDCHUJMVQbGW1lSsKZps1UL1mu1ji8S5Ntm9dCcLdtg/s1600/300px-Bronchi_lungs_ru.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhO74YOYQJte876lsdQYJdessIosomn9d18o2sbRyqVZUD-vxvGLKxepVcj-luOW3X8LewSPjmCiDxQlHNiEd1utF-ysH6URsYXJHDCHUJMVQbGW1lSsKZps1UL1mu1ji8S5Ntm9dCcLdtg/s1600/300px-Bronchi_lungs_ru.jpg" /></a></div>
Our system is made from bronchial tree meant to move air flow through the lungs joined with associate alveolar method meant to catch your air. each equally are usually afflicted by diverse form of optimisations. merely tree-like set ups, your paper shows, are ready to effectively nourish parts above a small size, below which sometimes parts are usually alone feasted by merely diffusion. Specially, your authors initial display of which electricity losses regarding liquids through transport are usually minimised within a tree-like composition regarding form dimensions 3. Minute, they show that this optimised tree can be ‘space-filling’ for you to optimise proximity towards the operational alveolae. Finally, they display that your method meant to scale back the time period place in to <br />
<a name='more'></a>move liquids during associate appendage has got the precise same form seo.</div>
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In associate biological process perspective, how huge is primitive multi-cellular species gave the impression to be necessarily restricted to nutrients’ diffusion pace. One particular theory sorted during this review is really of which larger primitive animals get thus been conditioned by the modern Darwinian giving of tree-like ‘space-filling’ wholesome submission techniques. subsequently, their own hereditary stuff gave the impression to be willing to be contributed allowing class taking in element. Effective inspirations similarly as expirations series had to be optimised to ensure that external air flow can reach your alveoli previous end begins. This specific form of biological process tinkering, your authors imagine, might have granted your beginning regarding class respiration-as against fish-style eupneic and breathing by means of gills.<br />
Also, your paper demonstrates your composition on the alveolar method is so optimum allowing productive transport regarding air within the air flow towards the blood. This specific utterly new perception in to the lung’s biological process procedure stems from your actual physical principles underlying your beaux arts mastery regarding residing techniques.</div>
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Read more at: <a href="http://phys.org/news/2013-10-fluid-dynamics-lungs-evolution.html#jCp">http://phys.org/news/2013-10-fluid-dynamics-lungs-evolution.html#jCp</a></div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-29479444004891014062015-03-15T17:51:00.000+05:302015-03-15T19:33:35.622+05:30Quick Revision Study Materials for Class XII<div dir="ltr" style="text-align: left;" trbidi="on">
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Quick Revision Study Materials for Class XII<div id="chitikaSelectBeacon0" style="border: 0px; float: left; font-family: inherit; font-size: 21.6000003814697px; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-4664683339043799412015-03-15T17:42:00.000+05:302015-03-15T17:42:11.325+05:30Online practice tests for JEE 2014<div dir="ltr" style="text-align: left;" trbidi="on">
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Online practice tests for JEE 2014 ">Online practice tests for JEE 2014</a></h2>
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<span style="border: 0px; color: navy; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; vertical-align: baseline;"><b>Mock Test for Practicing of Computer Based Examination of JEE (Main) 2014 </b></span><span style="line-height: 1.3em;"> | </span><a href="http://www.digialm.com/EForms/Mock/Template/index.html?223@@101" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="Test 1"><span style="border: 0px; color: navy; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><b>Test 1</b></span></a><span style="line-height: 1.3em;"> | </span><a href="http://www.digialm.com/EForms/Mock/Template/index.html?223@@102" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="Test 2"><span style="border: 0px; color: navy; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><b>Test 2</b></span></a><span style="line-height: 1.3em;"> | </span><a href="http://www.digialm.com/EForms/Mock/Template/index.html?223@@103" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="Test 3"><span style="border: 0px; color: navy; font-family: inherit; font-style: inherit; font-weight: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><b>Test 3</b></span></a><span style="line-height: 1.3em;"> | </span><span style="border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border: 0px; color: navy; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;"><b><a href="http://www.digialm.com/EForms/Mock/Template/index.html?223@@104" style="border: 0px; color: blue; font-family: inherit; font-style: inherit; font-weight: inherit; line-height: 1.3em; margin: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank" title="Test 4">Test 4</a></b></span></div>
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What are the advantages in opting for Computer Based Examination?</div>
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a) The candidate can review or re-answer any question at any point of time during the examination.</div>
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b) The candidate can change the option of the answer during the exam duration and it is one of the most important feature of computer based examination</div>
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c) The candidate also has the option to mark any answer for review at later stage during the examination.</div>
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d) There will be a panel on computer screen showing all the question nos in different colour scheme which will indicate which are the questions answered, left un answered and marked for review</div>
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e) Candidate gets the flexibility in choosing the exam date of his/her choice as per his/her convenience.</div>
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f) It will make Candidate feel confident on use of Information technology.</div>
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g) You can also save upto Rs. 400 in Exam fees compare to Pen/Paper mode.</div>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-38639959904071276882015-03-15T17:38:00.001+05:302015-03-15T17:38:56.233+05:30Latest Board Sample Papers and Guess Papers<div dir="ltr" style="text-align: left;" trbidi="on">
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-59619420660986909092015-03-15T15:36:00.000+05:302015-03-15T17:29:09.650+05:30Semiconductor Devices :: Some Questions for Practice<div dir="ltr" style="text-align: left;" trbidi="on">
<strong>SEMICONDUCTORS</strong>
<br />
<ol style="text-align: left;">
<li>Draw a circuit diagram of OR gate.</li>
<li>What is a logic gate?</li>
<li>What types of charge-carriers are there in a n-type semi conductor?</li>
<li>Give the logical symbol of an AND gate. Mark the inputs and outputs.</li>
<li>Draw the logic symbol for a NAND gate.</li>
<li>Which biasing will make the resistance of p-n junction high?</li>
<li>Write the truth table for OR gate.</li>
<li>What is the change in the collector current, in a transistor of a.c. current gain 150, for a 100µA change in its base current?</li>
<li>When the voltage drop across a p-n junction diode is increased from 0.65V to 0.70V, the change in the diode current is 5mA. What is the dynamic resistance of the diode?</li>
<li>How does conductivity of a semiconductor change with rise in its temperature?</li>
<li>Draw a p-n junction with reverse bias.</li>
<li>What is the order of energy gap in a semiconductor?</li>
<li>Give the ratio of the number of holes and the number of conduction electrons in an intrinsic semiconductor.</li>
<li>In the given diagram, is the diode D forward or reversed biased?<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_1.jpg"><img alt="" class="alignnone size-full wp-image-207" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_1.jpg" height="49" width="239" /></a></li>
<li>Convert the number 39 into binary system.<a name='more'></a></li>
<li>Write the truth table for the combination of gates shown here. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_2.jpg"><img alt="" class="alignnone size-full wp-image-208" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_2.jpg" height="53" width="239" /></a></li>
<li>How does the conductance of a semi conducting material change with rise in temperature?</li>
<li>Draw energy band diagram for (i) p- type extrinsic semiconductor (ii) n-type extrinsic semiconductor (iii) intrinsic semiconductors</li>
<li>Write the truth table for the following combination of gates: <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_3.jpg"><img alt="" class="alignnone size-full wp-image-209" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_3.jpg" height="206" width="330" /></a></li>
<li>How does the collector current change in a junction transistor, if the base region has larger width?</li>
<li>How does the thickness of the depletion layer in a p-n junction vary with increase in reverse bias?</li>
<li>How does the energy gap in an intrinsic semiconductor vary, when doped with a pentavalent impurity?</li>
<li>Name the logic gate realized using p-n junction diodes in the given diagram. Give its logic symbol. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_4.jpg"><img alt="" class="alignnone size-full wp-image-210" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_4.jpg" height="108" width="240" /></a></li>
<li>How does the energy gap in an intrinsic semiconductor vary, when doped with a trivalent impurity?</li>
<li>How does the width of the depletion region of a p-n junction vary, if the reverse bias applied to it increases?</li>
<li>What is a solar cell? How does it work? Give its one use.</li>
<li>Frequency of input voltage to a half –wave rectifier is 50 Hz. What will be the frequency of the output voltage?</li>
<li>Draw the graph showing the variation of current with voltage for a p-n junction diode.</li>
<li>The output of an AND gate is connected to both the inputs of NAND gate. Draw the logic circuit of this combination of gates and write its truth table.</li>
<li>Derive a relationship between current gain of common base amplifier and current emitter amplifier.</li>
<li>Draw a circuit for p-n junction diode in forward bias. Sketch the voltage versus current graph for the same.</li>
<li>In the following diagrams, indicate which of the diodes are forward biased and which are reverse biased. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_5.jpg"><img alt="" class="alignnone size-full wp-image-211" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_5.jpg" height="108" width="533" /></a> </li>
<li>If the emitter and base of n-p-n transistor have same doping concentration, explain how will the collector and base-currents be affected?</li>
<li>What is an intrinsic semiconductor? How can you convert an intrinsic semiconductor into N-type extrinsic semiconductor?</li>
<li>Distinguish between n-type and p-type semiconductors on the basis of energy band diagram.</li>
<li>What is an ideal diode? Draw the output waveform across the load resistor R, if the input waveform is as shown in the figure.<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_6.jpg"><img alt="" class="alignnone size-full wp-image-212" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_6.jpg" height="110" width="357" /></a></li>
<li>Write the function of base region of a transistor. Why is this region made thin and slightly doped?</li>
<li>The output of a two input NAND gate is fed to a NOT gate. Write down the truth table for the final output of the combination.</li>
<li><table border="1" cellpadding="0" cellspacing="0" style="text-align: left;"><tbody>
<tr><td valign="top" width="45">A</td><td valign="top" width="45">B</td><td valign="top" width="50">Output</td></tr>
<tr><td valign="top" width="45">0 0 1 1</td><td valign="top" width="45">0 1 0 1</td><td valign="top" width="50">1 1 1 0</td></tr>
</tbody></table>
</li>
<li>The input resistance of a CE amplifier is 2K? and a current gain is 20. If the load resistance is 5 k?, Calculate: (i) the voltage gain of the amplifier and (ii) the trans-conductance of transistor used.</li>
<li>Draw the logic symbol of a 2-input NAND gate. Write down its truth table.</li>
<li>Draw the logic symbol of a 2-input NOR gate. Write down its truth table.</li>
<li>Give the logic symbol of AND gate. Explain with the help of circuit diagram, how this gate is realized in practice.</li>
<li>Give the logic symbol of OR gate. Explain with the help of circuit diagram, how this gate is realized in practice.</li>
<li>What is meant by the term, dopping of an intrinsic semiconductor? How does it affect the conductivity of a semiconductor?</li>
<li>If the output of a 2-input NAND gate is fed a the input to a NOT gate (i) name the new logic gate obtained and (ii) write down its truth table.</li>
<li>Explain briefly why the output and input signals of a common-emitter amplifier differ in phase by 180<sup>0</sup>.</li>
<li>In only one of the circuits given below the lamp L lights. Which circuit is it? Give reason for your answer.<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_7.jpg"><img alt="" class="alignnone size-full wp-image-213" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_7.jpg" height="162" width="586" /></a></li>
<li>In the circuit diagram given, a voltmeter V is connected across a lamp L. What changes would occur at lamp L and voltmeter V, if the resistor R is reduced in value? Give reason for your answer. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_8.jpg"><img alt="" class="alignnone size-full wp-image-214" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_8.jpg" height="162" width="285" /></a></li>
<li>Draw the energy band diagram of an N-type semiconductor. How does the forbidden energy gap of an intrinsic semiconductor vary with increase in temperature?</li>
<li>If the emitter and base region of a transistor have same doping concentration, state how (i) collector current and (ii) d.c. current gain of the transistor will change.</li>
<li>Determine the currents through the resistance ‘R’ of the circuits (i) and (ii), when similar diodes D<sub>1</sub> and D<sub>2</sub> are connected as shown below. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_9.jpg"><img alt="" class="alignnone size-full wp-image-215" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_9.jpg" height="116" width="422" /></a></li>
<li>Pure silicon at 300 K has equal electron and hole concentrations of 1.5 x 10<sup>16</sup>/m<sup>3</sup>. Doping by Indium   increases the hole concentration to 4.5 x 10<sup>22</sup>/m<sup>3</sup>. Calculate the new electron concentration in the doped silicon.</li>
<li>Distinguish between n-type and p-type semiconductors on the basis of energy band diagram.</li>
<li>The output of an OR gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of gates and write its truth table.</li>
<li>Draw a circuit diagram to show the biasing of a n-p-n transistor. Explain the transistor action.</li>
<li>Define the terms 'potential barrier' and ‘depletion region’ for a p-n junction diode. State how the thickness of depletion region will change when the p.n junction diode is (i) forward biased. (ii) reverse biased.</li>
<li>With the help of labelled circuit diagram, explain the rectification action of a full wave rectifier.</li>
<li>If the base region of a transistor is made large, as compared to a usual transistor, how does it affect (i) the collector current, and (ii)current gain of this transistor? What is the phase difference between the input and output signals of a common emitter amplifier?</li>
<li>Explain how the depletion layer and barrier potential are formed in a p-n junction diode.</li>
<li>The output of an OR gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of gates and write its truth table.</li>
<li>Symbolically represent a pnp transistor. Show the biasing of a pnp transistor and explain the transistor action.</li>
<li>Distinguish between conductors, semiconductors and insulators on the basis of band theory of solids.</li>
<li>Draw the circuit diagram of a common-emitter amplifier, with appropriate baising. What is the phase difference between the input and output signals ?State two reasons why a common-emitter-amplifier is preferred to a common base amplifier.,</li>
<li>Draw the energy band diagram of a p-type semiconductor. Deduce an expression for the conductivity of a p-type semiconductor.</li>
<li>Draw a circuit diagram to obtain the characteristics of a npn transistor in emitter configuration. Describe   how you will obtain input and output characteristics. Give shape of the curves.</li>
<li>Draw the circuit diagram of a full-wave rectifier and briefly explain its working principle.</li>
<li>Identify the logic gates marked X and Y in the figure given. Write the truth-table to find the. output at Z for all values of A and B. <a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_10.jpg"><img alt="" class="alignnone size-full wp-image-216" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_10.jpg" height="76" width="330" /></a></li>
<li><table cellpadding="0" cellspacing="0" style="height: 29px; text-align: left; width: 25px;"><tbody>
<tr><td height="8" width="96"></td></tr>
<tr><td></td><td></td></tr>
</tbody></table>
</li>
<li></li>
<li>Explain how the depletion region and barrier potential are formed in a p-n junction diode.</li>
<li>Identify the logic gates marked X and Y in the figure given. Write the truth-table to find the. output at Z for all values of A and B.<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_11.jpg"><img alt="" class="alignnone size-full wp-image-217" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_11.jpg" height="76" width="330" /></a></li>
<li><table cellpadding="0" cellspacing="0" style="height: 32px; text-align: left; width: 1px;"><tbody>
<tr><td height="10" width="108"></td></tr>
<tr><td></td><td></td></tr>
</tbody></table>
</li>
<li></li>
<li>With a circuit diagram, briefly explain how a zener diode can be used as a voltage regulator.</li>
<li>In the figure given below is (i) the emitter, and (ii) the collector forward or reverse biased? With the help of a circuit diagram, explain the action of a n-p-n transistor.</li>
<li><div style="text-align: left;">
<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_12.jpg"><img alt="" class="alignnone size-full wp-image-218" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_12.jpg" height="110" width="161" /></a> </div>
</li>
<li>Explain how an intrinsic semiconductor can be converted into (i)n-type and (ii) p-type semiconductor. Give one example of each and their energy band diagrams.</li>
<li>Draw the circuit diagram to show the use of a transistor as an oscillator. State how the positive feedback is provided in the circuit.</li>
<li>In the figure below, circuit symbol of a logic gate and two input waveforms 'A' and 'B' are shown.</li>
<li><div style="text-align: left;">
<a href="http://plustwophysics.com/wp-content/uploads/2010/02/fig_13.jpg"><img alt="" class="alignnone size-full wp-image-219" src="http://plustwophysics.com/wp-content/uploads/2010/02/fig_13.jpg" height="150" width="194" /></a> (i) Name the logic gate. (ii) Write its truth table. (iii) Give the output waveform. </div>
</li>
<li>A semiconductor has the electron concentration 0.45 x 10<sup>12</sup>/m<sup>3</sup> and hole concentration 5 x 10<sup>20</sup> m<sup>-3</sup>. Find its conductivity. Given electron mobility = 0.135m<sup>2</sup> V<sup>-l</sup>s<sup>-1</sup> and hole mobility 0.048 m<sup>2</sup>V<sup>-l</sup>s<sup>-1</sup> .</li>
<li>A semiconductor has equal electron and hole concentrations of 2 x 10<sup>8</sup>/m<sup>3</sup>. On doping with a certain impurity, the hole concentration increases to 4 x 10<sup>10</sup>/m<sup>3</sup>. (i) What type of semiconductor is obtained on doping?(ii) Calculate the new electron hole concentration of the semiconductor. (iii) How does the energy gap vary with doping?</li>
<li>In a transistor, the base current is changed by 30 ?A. This results in a change of 0.03 V in base to emitter voltage and a change of 3 mA in the collector current.(i) Find (a) current gain '?<sub>ac</sub>' and (b) transconductance 'gm', (ii) If this transistor is used as an amplifier with the load resistance 7.5 k?, calculate voltage gain of amplifier.</li>
<li>The input resistance of a silicon transistor is 665 ?. Its base current is changed by 15 ?A which results in change of collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 5 k ?.Calculate(i) current gain '?a.c.', (ii) trans-conductance 'g<sub>m</sub>', and (iii) voltage gain 'Av' of the amplifier.</li>
<li>In a transistor a change of base current by 20 ?A, results in a change of 0.02V in base emitter voltage and a change of 2mA in the collector current, Find (i) current gain '?a.c.', (ii) trans-conductance 'g<sub>m</sub>'. Also calculate the voltage gain of this transistor when used as a common emitter amplifier with a load resistance of 5 k?.</li>
<li>How a pn junction can be used as a (a) half wave rectifier (b) full-wave rectifier?</li>
<li>What is a pn junction? Explain with the help of a diagram, how depletion layer is formed near the junction. Explain also what happens to this layer when the junction is (i) forward biased and (ii) reverse biased.</li>
<li>What do you understand by the term “holes†in a semiconductor. Discuss how they move under the influence of electric field.</li>
<li>What is a pn junction? How is a pn junction made? How potential barrier is caused into it?</li>
<li>By drawing a labeled circuit diagram, explain how a NPN transistor can be used as an amplifier in common base configuration. Find its current gain, voltage gain and power gain.</li>
<li>Define the terms “potential barrier†and ‘depletion region’ for a pn junction. Explain with the help of a circuit diagram, the use of a pn junction as a full wave rectifier. Draw the input and output waveforms.</li>
<li>Frequency of input voltage to a half wave rectifier is 50Hz. What will be the frequency of the output voltage?</li>
<li>In a n type semiconductor, the number of free electron is greater than the number of holes. Does it have net negative charge? Why?</li>
<li>Write short note on LED.</li>
</ol>
<ul style="text-align: left;">
</ul>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-49310237732983209482015-03-15T15:25:00.001+05:302015-03-15T17:30:02.985+05:30Revision Questions for AISSE Physics for SA 1<div dir="ltr" style="text-align: left;" trbidi="on">
<strong><span style="text-decoration: underline;"><span style="font-family: Times New Roman;">ELECTRICITY </span></span></strong><br />
<ol style="text-align: left;">
<li> Define electric potential difference?</li>
<li>Why is an ammeter connected in series in a circuit?</li>
<li>Why is a voltmeter connected in parallel in a circuit?</li>
<li>State the law that governs the strength of the current passing through a metallic conductor when a p.d is applied across its end. Illustrate this law graphically? </li>
<li>State the law which governs the amount of heat produced in a metallic conductor when current is passed through it for a given time. Express this law mathematically? </li>
<li>Define resistance. What are the factors on which it depends? </li>
<li>A copper wire of resitivity P is stretched to reduce its diameter to half its previous value. What is the new resistivity?</li>
<li>Define the S I unit of electric current and potential difference. </li>
<li>Derive expressions for equivalent resistance of resistors connected in a. series combination b. parallel. combination </li>
<li>What is an electric fuse? Explain its function.<a name='more'></a> </li>
<li>Explain, how the heating effect of electric current is made use in the functioning of an electric bulb? </li>
<li>State the relation between the commercial and SI unit of electric energy. </li>
<li>Write the advantages of connecting electrical appliances in parallel and disadvantages of connecting them in series in a household circuit. </li>
<li>Why is tungsten used almost exclusively for making the filaments of electric lamps? </li>
<li> A piece of wire is redrawn by pulling it until its length is doubled .Compare the new resistance with the original value. </li>
<li>An electric geyser has rating 2000 w, 220 v marked on it. What should be the minimum rating in whole number of a fuse wire that may be required for safe use with the geyser? </li>
<li> Three resistors each of resistance 10 ohm are connected, in turn, to obtain a. minimum resistance b. Maximum resistance. Compute a) The effective resistance in each case b) The ratio of minimum to maximum resistance so obtained. </li>
<li>Two resistors of resistance 2 ohms and 4 ohms are, in turn connected a) In series b) In parallel to a given battery for same interval. Compute the ratio of the total quantity of heat produced in the combination in the two cases. </li>
<li> Two metallic wires A and B are connected in parallel. Wire A has length L and radius R wire B has a length 2L and radius 2r. Compute the ratio of the total resistance of parallel combination and resistance of wire A.</li>
<li>In a house three bulb of 100w each are lighted for 4 hours daily and six tube lights of 20w each are lighted for 5 hours daily and a refrigerator of 400w is worked for 10 hours daily for a month of 30 days. Calculate the electricity bill if the cost of one unit is Rs 4.00.</li>
<li>Three resistors of 4ohms, 6ohms and 12 ohms are connected in parallel. The combination of above resistors is connected in series to a resistance of 2 ohms and then to a battery of 6 volts. Draw a circuit diagram and calculate a) Current in main circuit b) Current flowing through each of the resistors in parallel c) P.d and the power used by the 2 ohm resistor.</li>
<li> Two lamps, one rated 100 W at 220 V and the other 60W at 220 V, are connected in Parallel to a 220 volt supply. What current is drawn from the supply line? </li>
</ol>
<strong>Magnetic Effects of Current</strong> <br />
<ol style="text-align: left;">
<li>What is a magnetic field? What are field lines around a magnet? </li>
<li> List the characteristic properties of magnetic field lines. </li>
<li> Sketch the pattern of magnetic field lines around a bar magnet.</li>
<li> Sketch the pattern of magnetic field lines around a current-carrying straight conductor and state the factors on which the strength of magnetic field depends. </li>
<li>State right hand thumb rule to find the direction of magnetic field around a current –carrying straight conductor. How will this magnetic field be affected on (a) Increasing the current through the conductor. (b) Changing the direction of flow of current in the conductor. </li>
<li>A student performs an experiment to study the magnetic effect of current around a current-carrying straight conductor. He reports that (a) The direction of deflection of thenorth pole of the compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are interchanged. (b) For a give battery, the degree of deflection of N pole decreases when the compass is kept at a farther away from the conductor. Which of the above observations of the student is incorrect and why?</li>
<li> Describe with a neat diagram an activity to show that a straight conductor carrying direct current produces a magnetic field around it. State the rule which determines the direction of magnetic field thus produced. </li>
<li>Draw the lines of force (indicating the direction) of magnetic field through and around (a) a single loop of wire carrying direct current. (b) a solenoid carrying direct current. </li>
<li>What are the factors on which the magnetic field due to a current-carrying circular coil depends? Also explain the pattern of field lines produced in and around a circular coil. </li>
<li> Draw the pattern of magnetic field lines of a current-carrying solenoid. What does the pattern of field lines inside a solenoid indicate? Write one application of magnetic field of current-carrying solenoid. </li>
<li> What is an electro-magnet? Draw a diagram showing an electro-magnet. </li>
<li> The magnetic field in a given region is uniform. Draw a diagram to represent it. </li>
<li> (a) Describe with diagram an experiment to show that a force is exerted on a current-carrying conductor when placed perpendicular in amagnetic field. (b) State the rule to find the direction of the force exerted on a current-carrying conductor in a magnetic field . (c) A current-carrying straight conductor is placed in the East-West direction. What will the direction experienced by the conductor due to earth’smagnetic field? </li>
<li> Why does a current-carrying conductor kept in a magnetic field experience force? On what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force. </li>
<li> With a labeled diagram, describe the construction and working of an electric motor. What is the function of split ring commutator in a motor? </li>
<li> What is the use of a commutator? Name the component in an electric motor which acts as a commutator. </li>
<li>What is an armature? Mention the alternative methods adopted in commercial motors to enhance their power. </li>
<li>. Explain the principle of an electric motor. Name some appliances in which the electric motor is used. </li>
<li>A positively charged particle projected towards West is deflected towards North by a magnetic field. What is the direction of the magnetic field? </li>
<li>. Explain the meaning of the word “electro-magnetic†and “induction†in the term electro-magnetic induction. On what factors does the value of induced current produced in a circuit depend? Name and state the rule used for determination of direction of induced current. State one practical application of this phenomenon in everyday life. </li>
<li>. Why is electro-magnetic induction so called? A coil connected to a sensitive galvanometer is held stationary. A bar magnet with its North Pole facing coil is moving towards the coil at a certain speed. The galvano meter needle shows deflection of 10 divisions to towards right of the centre of the scale. How will the reading on the galvanometer scale be affected if the south pole of the bar magnet facing the coil is moved away at the same speed? </li>
<li> Describe an activity to demonstrate the phenomenon of electro-magnetic induction. </li>
<li> State Fleming’s right hand rule. How is this rule useful?</li>
<li>Explain different ways to induce current in a coil. </li>
<li>(a) With the help of a neat labeled diagram, explain the construction and working of an electric generator. What is the function of bushes? (b) How does a D.C generator differ from that of A.C generator? </li>
<li> How does A.C differ from D.C? Which sources produce alternating current? What is the frequency of alternating current in India </li>
<li> Draw a schematic labeled diagram of a domestic electric circuit which includes a mains fuse, a power meter, a light point, a fan and a power plug. </li>
<li> What do you mean by (a) short circuit and (b) overloading? What are the safety precautions taken to avoid these problems in domestic electric circuits? </li>
<li>(a) An electrician put a fuse rating of 5A in that part of domestic electric circuit in which an electric heater of rating 1.5kW, 220V is operating. What is likely to happen in this and why? What change, if any, needs to be made? (b) You are given the following current time graphs from two different sources. (i) Name the type of current in two cases. (ii) Identify any one source for each type of these currents. (iii) What is the frequency of current in case II in India? (iv)Use above graphs to write two differences between the current in two cases. </li>
<li> An electrician assembling a household circuit uses a long thick copper wire with green insulation and a short wire made up of copper-tin alloy. What are the two wires called? Mention the importance of each wire in an electric circuit. How are the two wires connected in the circuit?</li>
</ol>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-74046191421713355382015-03-15T15:06:00.001+05:302015-03-15T17:31:11.643+05:30Revision Questions for AISSE Physics SA 2<div dir="ltr" style="text-align: left;" trbidi="on">
<strong>LIGHT - REFLECTION AND REFRACTION</strong>
<br />
<ol style="text-align: left;">
<li>
What are the differences between real image and virtual image?
</li>
<li>The radius of curvature of a concave mirror is -46cm.What is its focal length?
</li>
<li>How will you identify a plane mirror, a concave mirror and a convex mirror without touching their surface?
</li>
<li>Which mirror has a wider field of view? Why?</li>
<li>What happens to a ray of light when it travels from a rarer medium to a denser medium?
</li>
<li>What will be the signs of u, v and f for a convex lens as per sign convention?
</li>
<li>State Snell's law of refraction?
</li>
<li> A lens always forms a diminished, erect and virtual image .Identify the nature of the lens?</li>
<li>Where should an object be placed so that a real and inverted image of the same size is formed using a convex lens?
</li>
<li>How is the power of a lens related to its focal length?
</li>
<li>What is the S I unit of power of a lens? Define.<a name='more'></a>
</li>
<li> Two lenses having power P1 and P2 are placed in contact. What is the net power of the combination?
</li>
<li>Two lenses of powers 4D and -5D are kept in contact. Find the focal length of the combination. What is the nature of the combination?
</li>
<li>What do you understand by the term refractive index?
</li>
<li> The image of our face is viewed in and out of the curved surface of a spoon. What change in the image is observed? How will you explain this?
</li>
<li> You should not look at the sun directly or even into a mirror reflecting the light from the sun. Justify.
</li>
<li>You need an erect and enlarged image of on object on a mirror. Which mirror would you choose?
</li>
<li> You need to get an image of the size as that of the object using a lens. What is the suitable lens to be used?</li>
<li> The image of an object at a distance of 20 cm from a mirror is formed at the object itself.
1) Identify the mirror 2) The nature of the image
3) size of the image 4) the focal length of the mirror
5) radius of curvature of the mirror
Draw the corresponding ray diagram.
</li>
<li> Draw a ray diagram to show the formation of the image of an object placed at the centre of curvature of a concave mirror.
</li>
<li>A convex mirror used on an automobile has radius of curvature of 2 m .If a car is located at 4 m from the mirror, find the position nature and size of the image
</li>
<li>Why is convex mirror preferred to be used as a driver's rear-view mirror?
</li>
<li> For what position of an object, a virtual image is formed by a convex lens? Draw a ray diagram to show the formation of a virtual image by a convex lens. What are the other characteristics of the image?
</li>
<li>Why is a concave lens is called diverging lens, whereas a convex lens a converging lens? Explain with the help of ray diagrams.
</li>
<li>Why the apparent depth of a swimming pool is less than its real depth? On what factors does the difference between the two depend?
</li>
<li> Two lenses having power of 2.0D and 0.25D are combined together. What is the
(a) net power of combination?
(b) focal length of the combination?
</li>
<li> Give two uses of convex lens.
</li>
<li> Give two uses of convex mirrors
</li>
<li>Give two uses of concave mirror.
</li>
<li> Give two uses of concave lens
</li>
<li>Give two uses of plane mirror.
</li>
<li> Show the path of a ray of light through a rectangular glass slab. Label incident ray, refracted ray, emergent ray, the angle of incidence and angle of emergence and lateral displacement. Why is angle of incidence equal to the angle of emergence?
</li>
<li>Drawing ray diagrams for an object at infinity and by using the new sign convention show that the focal length of a concave mirror is negative and that of convex mirror is positive.
</li>
<li>State three rules for drawing geometric images in concave lens.
</li>
<li> A reflected ray of light makes an angle of 900 with the incident ray of light. What are the angle of incidence and the angle of reflection? Draw a diagram to illustrate these rays.
</li>
<li> State the laws of refraction.
</li>
<li>An object 4cm high is placed 15cm away from a concave lens of focal length 10cm. Draw a ray diagram and find the position, size and nature of the image formed</li>
<li> An object is kept in front of a concave mirror of focal length 20cm.The image formed is three times the size of the object. Calculate the two possible distances of the object from the mirror.
</li>
<li> An object 0.4m high is placed at a distance of 0.8m from a concave mirror of radius curvature 0.4m. Find the position, nature and size of the image formed?
</li>
<li>Two thin converging lenses of focal length 15cm and 30cm are held in contact with each other. Calculate the power and focal length of combination.</li>
<li>Find the position of an object which when placed in front of a concave mirror of focal length 20cm, produces a virtual image, which is twice the size of the object.</li>
<li> Draw a ray diagram to show the formation of an object placed between the pole and focus of a concave mirror.
</li>
<li>What is a lens? Distinguish between a convex and concave lens.
</li>
<li> What do you understand by the power of a lens? Define magnification in case of spherical mirror and lens. Mention the new Cartesian sign convention applicable to in this case.
</li>
<li>Draw a ray diagram to show the formation of the image of an object placed between optical centre and focus of a convex lens.</li>
<li>. You are required to obtain an erect image of an object placed in front of a concave mirror of focal length 15cm.What should be the approximate distance of the object from the pole of the mirror? What is the nature of the image? Is the image larger of smaller in size than the object? Draw a ray diagram to show the formation of image.
</li>
<li> An object of size 5cm is placed at a distance of 25cm from the pole of a concave mirror of radius of curvature 30cm.Calculate the distance and size of the image so formed. What will be the nature of the image?</li>
<li>An object of size 3cm is placed at a distance of 15cm from a convex lens of focal length 10cm.Calculate the distance and size of the image so formed. What will be the nature of the image?
</li>
<li>Determine the speed of light in glass which has refractive index of 1.5, if the speed of light in vacuum is 3x108m/s.
</li>
<li> A 1cm high image is obtained on a screen a t a distance of 20cm from a convex lens of focal length 10cm.What is the size the object?</li>
<li> The radius of curvature of a convex mirror is used on a moving automobile is 2.0 m. A truck is coming behind it at a constant distance of 3.5 m. Calculate (1) the position, and (2) the size of image relative to the size of the truck. What will be the nature of the image?
</li>
<li>(a) Draw a ray diagram to show passage of two rays of light through a rectangular slab of glass, when the angle of incidence is zero in one case and a littler less than 900 in the other case.
50. A transparent medium A floats on another transparent medium B .When a ray of light travels obliquely from A into B the reflected ray bends away from the normal. Which of the media A and B is optically denser and why?
</li>
<li> Where will the image is formed by a convex mirror if the object is placed between infinity and the pole of the mirror?</li>
<li> A convex lens has a focal length of 50cm. Calculate its power.
</li>
<li> IDENTIFY THE LENS/MIRROR
i) Focal length positive
ii) Focal length negative
iii) Power positive
iv) Power negative
v) Forms virtual image always magnified
vi) Forms only diminished virtual images
vii) Magnification always positive
viii) Magnification always less than one
ix) Can produce image of the same size
x) Forms real point sized image
xi) Forms virtual point sized image
xii) Used as shaving mirror
xiii) Used as rear view mirror
xiv) Have wide field of view
xv) Converges the incident rays
xvi) Diverges the incident rays
</li>
</ol>
<strong>SOURCES OF ENERGY</strong><br />
<ol style="text-align: left;">
<li> What are the properties of a good fuel?
A good fuel is the one which can produce
i) large amount of heat
ii) less amount of smoke and
iii) easily available
</li>
<li>List the properties of a good source of energy
A good source of energy is the one which
i. would do a large amount of work per unit volume or mass
ii. can be easily accessible
iii. can be easily stored and transported and
iv. is economical
</li>
<li>If you could use any source of energy for heating your food, which one would you use and why?
Good fuel. For reasons refer Qn. No.1
</li>
<li>What are fossil Fuels? Discuss the advantages and disadvantages of a fossil fuel?
The non – renewable sources of energy which was formed over millions of years ago underground in the form of coal and petroleum are called fossil fuels.
Advantages
Fast growing global demand for energy for industrialization was met by fossil fuels. It can be used for the generation of electricity.
Disadvantages
Burning fuels cause air pollution due to the oxides of carbon, nitrogen and sulphur that are released on burning fossil fuels. As these are acidic oxides, they lead to acid rain which affects our water and soil resources.
</li>
<li> How has the traditional use of wind and water energy been modified for our convenience?
Wind energy which was used initially for lifting water are now used for generating electricity.
Water energy which was used for transportation before is now a good source to generate electricity.
</li>
<li>Why are we looking for alternate source of energy?
Because fossil fuels are exhaustible.
</li>
<li>What measures are to be taken to reduce air pollution caused due to fossil fuel?
Pollution can be reduced by increasing the efficiency of the combustion process and using clean fuel thereby reducing the escape of harmful gases.
</li>
<li> Brief the basic construction of an electric generator.
The simplest device used for generating electricity has one moving part, a rotor-blade assembly. The moving water or wind or steam acts on the blades to spin it which impart energy to the rotor. This turns the shaft of the dynamo and converts mechanical energy into the electrical energy.</li>
<li>How is electricity generated in thermal Power plants?
Fossils fuels are burnt in large amount to heat up water and to produce steam. The steam turns the turbine to generate electricity.
Many thermal power plants are set up near coal or oil fields because transmitting electricity is more efficient than transporting coal and petroleum over the same distance.
</li>
<li> Write a note on the functioning of hydro power plants
The kinetic energy of flowing water or the potential energy of water at a height is used to rotate the turbine and generate electricity. This energy thus generated is hydel energy.
High – rise dams are constructed on the river to collect water in large reservoirs. The water from high level in the dam is carried through pipes to turbine at the bottom of the dam. The potential energy of the high level water is converted into kinetic energy and used to rotate the turbine to produce electricity.
</li>
<li>What are the advantages of hydel energy?
It is a renewable source of energy. Huge amount of energy can be harnessed through hydel power plants.
</li>
<li>What are the limitations in using hydel energy in spite of its huge generation of electricity?
The limitations are
a) Difficulty in building big dams
b) Non - availability of places, hilly terrains to construct dams
c) Large area of land is sacrificed
d) Large eco-systems are destroyed
e) The rotten vegetation under water produces methane a green- house gas
f) Danger to the people living nearby
g) Difficulty in the rehabilitation of the affected.
</li>
<li> What is meant by bio-mass?
The source of fuels obtained from plant and animal products like wood and cow dung is called bio – mass</li>
<li> What are the disadvantages of using bio-mass as a fuel?
i. They do not produce much heat on burning
ii. Lot of smoke is given out when burned which causes air pollution.
</li>
<li> How can you obtain charcoal from wood? In what way is it better than wood as a fuel?
When wood is burnt in limited supply of oxygen, water and volatile materials in it get removed, the residue left behind is called charcoal. It is smokeless and has higher heat generation efficiency (calorific value).</li>
<li>How is bio gas formed? Name the gases it contains.
The gas produced when cow dung, various plant materials like the residue after harvesting the crops, vegetable waste and sewage are decomposed in the absence of oxygen is called bio gas.
Biogas is the combination of gases like methane carbon dioxide, hydrogen and hydrogen sulphide.</li>
<li> Explain the construction and working of biogas plant.
Refer text Page 247
</li>
<li>What are the advantages of using biogas?
- Excellent fuel which burns without smoke and leaving no residue
- High heating capacity
- Also used for lighting
- The slurry left behind is an excellent manure
- Safe and efficient method of waste disposal
</li>
<li>How is wind energy harnessed?
Kinetic energy of wind is used to generate electricity using windmills. It consists of a large electric fan which is erected at some height. This fan is rotated by the wind which in turn rotates the turbine of an electric generator.
</li>
<li>What is a wind farm?
A large number of wind mills erected over large area is known as wind energy farm. The energy output of each wind mill is coupled together to get more electricity.
</li>
<li>What are the advantages of using wind mills to harness energy? What are the difficulties in constructing wind farms?
It is an environment friendly and efficient renewable source. No recurring expenses while using it.
The limitations faced are
a. Windmills can be erected only at those places where wind blows at a minimum speed of 15 km/h
b. Back up facilities are to be made in case of no wind
c. Required a large area of land for establishment
d. Initial cost of establishment is high and a high level of maintenance is required</li>
<li>Name some devices used for harnessing solar energy.
Solar heater, solar cooker, solar cell etc.
</li>
<li>What is the principle behind the working of a solar cooker?
The principles used are black body absorption and green house effect.
</li>
<li>. Explain how a solar cooker is constructed.
A box type solar cooker is made of a non conducting material with thick walls and its inner walls painted black. With the help of a plane mirror hinged on the top of the box, sunlight is reflected into the box. The box is covered with a glass sheet for the retention of heat inside due to green house effect. The range of heat inside is 100 degree Celsius to 140 degree Celsius, if kept for two to three hours. Keeping black containers in the box help us to cook food items that require slow heating. The limitations of using solar cooker are that it can be used only at certain times during a day.
Refer text for diagram fig14.6 page 249
</li>
<li> What kind of mirror – concave, convex or plain – would be best suited for use in solar cooker? Why?
Concave mirror is used in concentration type solar cookers to focus the heat radiation from sun to a particular point.
Plane mirror is used to reflect light into the box in the box type solar cooker.</li>
<li> Write a note on solar cells and its advantages and disadvantages.
Solar cells convert solar energy into electrical energy. It is made up of a material called silicon. Each cell can produce a voltage of 0.5 to 1 V and can produce about 0.7 W of electricity. Arrangement in which a large number of silicon cells are combined to get electricity in high level is called solar panel. They are mounted on specially designed inclined roof tops exposed to the solar radiation.
Advantages
- Need little maintenance and no focusing devices
- Can be useful in remote and inaccessible places where the power transmission is difficult.
Disadvantages
- Availability of special grade silicon is limited
- Manufacturing is expensive as silver is used for interconnecting cells
</li>
<li>What are the applications of solar cell?
1. Used in artificial satellites and spacecrafts
2. Used in radio or wireless transmission system or TV relay stations
3. Used in traffic signals, calculators and toys</li>
<li>What is meant by tidal energy? How is it used to generate electricity?
Due to the gravitational pull of the moon on the earth, the level of water in the sea rises and falls. This phenomenon is called high tide and low tide. The difference in sea level gives tidal energy. Tidal energy is harnessed by constructing a dam across a narrow opening to the sea. A turbine fixed at the opening converts tidal energy into electricity</li>
<li>What is wave energy?
The kinetic energy possessed by huge waves near the seashore can be used to operate the rotor of the generator and electricity is generated.
</li>
<li>Give the source of ocean thermal energy (OTE). Describe briefly the working of a Ocean Thermal Energy Plant (OTEP)
The water at the surface of the sea is heated more by the sun than that at the deep sea. The difference in temperature is exploited as ocean thermal energy. The ocean thermal energy plants, OTEC, work if this temperature difference is about 20 degree Celsius. The warm surface water is used to boil a volatile liquid like ammonia. This vapor is used to the run the turbine of a generator to get electricity. The cold water from the depth is pumped up to condense the vapor again to liquid ammonia.
</li>
<li>. What are the limitations of the energy that can be obtained from the oceans?
- Initial cost is high.
- No continuous supply of energy
- Difficulty in constructing power plants near the ocean.
</li>
<li> Identify the terms ‘hot spots’ and ‘hot springs’.
Due geological changes, molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called ‘hot spots’.
Hot water from hot spots finds outlets at the surface. Such outlets are known as"hot springs".
</li>
<li>Explain how geothermal energy can be harnessed. What is the limitation in harnessing it?
Refer text
</li>
<li>What are the two processes by which the nuclear energy is released?
Nuclear fission and nuclear fusion
</li>
<li> How the energy released by nuclear fission is made use of in generating electricity?
The nucleus of a heavy atom such as uranium can be split apart into lighter nuclei. Tremendous energy is released during this process. Nuclear reaction is used to harness this energy. Self sustaining chain reaction of the fuel ( uranium) releases energy in a controlled rate. This energy produces steam by heating water which rotate turbine to generate electricity.
Advantage: The amount of energy released is tremendous. Energy is supplied for a longer period of time from the source.
Disadvantages:
· Improper fuel storage and disposal of nuclear waste results in environmental contamination
· Possibility of risk of accidental leakage of nuclear radiation
· High cost of installation
· Limited availability of fuel.</li>
<li>Hydrogen has been used as a rocket fuel. Would you consider it as a cleaner fuel than CNG (Compressed Natural Gas)?
Yes. Because when hydrogen is burnt the byproduct is only water. So it is cleaner fuel compared to CNG.
</li>
<li>Can any source of energy be pollution free?
No. Although some sources are not producing any by - products causing pollution the construction or assembly of such devices produces some environmental damage. In this sense we can say no source of energy is pollution free.
<strong></strong></li>
</ol>
<br /></div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-19492885242433095962015-03-15T14:12:00.000+05:302015-03-15T17:31:35.933+05:30Clear your concepts - 1 (plus two - electrostatics)<div dir="ltr" style="text-align: left;" trbidi="on">
If you are preparing for entrance exams like AIEEE, IIT-JEE, AIIMS, etc. then your concepts should be very very clear. To clarify your concepts keep answering the questions that will appear in this series of clear your concepts.<br />
<br />
1. What is the minimum value of permitivity?<br />
2. What is the minimum value of relative permitivity?<br />
3. Does coulomb force between two charges depends upon the presence of other charges in their neighbourhood?<br />
4. Can the charge distribution be really continuous in strictest sense of term?<br />
5. It is difficult to carry out electrostatic experiments on humid days. Why?<br />
6. A negatively charged rod attracts a suspended object. Can we conclude that the object is positively charged?<br />
7. Repulsion is the sure test of electrification. Explain.<br />
<a name='more'></a><br />
8. Name the properties of charge in which it differs from mass.<br />
9. What is the value of 4πε<sub>0</sub>?<br />
10. What is the value of 1/4πε<sub>0</sub>?</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-45244055043558334342015-03-15T14:07:00.001+05:302015-03-15T17:13:21.598+05:30Plus one question paper for practice<div dir="ltr" style="text-align: left;" trbidi="on">
Download plus one <a href="http://sanjaymodi.files.wordpress.com/2007/02/1_december_test_2006.doc">question paper</a> for practice.</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-54076246453053470372015-03-15T14:05:00.003+05:302015-03-15T14:05:37.454+05:30Physics question paper for plus two students<div dir="ltr" style="text-align: left;" trbidi="on">
To download the question paper click this link <a href="http://sanjaymodi.files.wordpress.com/2007/02/2_december_test_2006.doc" title="+2_question paper">+2_question paper</a><br />
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-68771259134839682232015-03-15T14:01:00.000+05:302015-03-15T17:13:34.633+05:30Bad Handwriting? Don't worry ! Here are some tips.<div dir="ltr" style="text-align: left;" trbidi="on">
Bad hand writing is a cause of worry for many. They think that it cannot be improved easily.
But, you can make your hand writing attractive with a little care and following the three precautions
<br />
<ol>
<li>Keep the same size (Take care to write letters of same size)</li>
<li>Keep the same level (All letters should come in the same level.)<a name='more'></a></li>
<li>Keep the same inclination. (all letters must be equally inclined .. preferably forward)</li>
</ol>
Come back soon for more tips ..<br />
<ol>
</ol>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-9420110500548189742015-03-09T16:03:00.000+05:302015-03-18T11:21:53.397+05:30How was the physics question paper?How was the AISSCE physics question paper 2015? Were there questions outside syllabus. Was it too tough? Respond now to let your voice heard.<br/><br/><span class="post_sig">...<br/>Get free help in physics at www.plustwophysics.com</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-42475909648041706312015-03-07T21:25:00.000+05:302015-03-18T11:21:53.369+05:30A Question from OpticsIn method of determining refractive index of transparent liquid with help of convex lens and plane mirror ,an equi double convex lens of refractive index 1.5 has been taken….<br/>Sir plzzzz tell what is the relation for refractive index of liquid of convex lens and that of combination<br/><br/> <br/><br/>Can you answer?<br/><br/> Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-67174595729188271472015-02-02T20:48:00.000+05:302015-03-18T11:21:53.340+05:30The Coriolis force and a bit of equatorial flimflamGot by Mail from Jearl Walker<br/><br/>************************************<br/><br/>You have spent a lifetime on a rotating planet but the only frequent and obvious clues about the rotation are the apparent motion of the Sun during the day and the stars and Moon during the night. Otherwise, the rotation is not noticeable. However, there is one common feature that you probably have heard about. Because of the rotation, water will swirl in the counterclockwise direction when draining from a bathtub in the Northern Hemisphere and in the clockwise direction in the Southern Hemisphere. Right at the equator, on the line separating the two hemispheres, the water will drain without swirling.<br/><br/><a href="http://commons.wikipedia.org/wiki/File:Coriolis-force-globe.svg" target="_blank"><img class="zemanta-img-inserted zemanta-img-configured alignleft" title="coriolis force on earth" src="http://www.plustwophysics.com//upload.wikimedia.org/wikipedia/commons/thumb/5/58/Coriolis-force-globe.svg/350px-Coriolis-force-globe.svg.png" alt="coriolis force on earth" width="350" height="377" /></a><br/><br/>Here is a video proof of these draining results … well, the video <em>seems</em> to prove them and with stunning ease. The demonstrator first drains water from a small tub placed right on the equator, marked with stones as you can see. There is no swirling. Then she moves the demonstration a short distance south of the equator, and the water drains with clockwise swirling. Finally she moves the demonstration a short distance north of the equator, and the water drains with counterclockwise swirling.<br/><br/><a href="https://www.youtube.com/watch?v=4IIVfoDuVIw">https://www.youtube.com/watch?v=4IIVfoDuVIw</a><br/><br/>However, what you see in the video is at best a magic trick and at worst a scam. Before I explain the video, let me set you up about the physics of a strange effect due to Earth’s rotation.<br/><br/>Because we rotate along with the ground, there seems to be a force called the Coriolis force that can cause a deflection in material (such as water) that moves over Earth’s surface. The deflection occurs because the speed of the ground around Earth’s rotation axis differs with latitude. The speed is greatest at the equator. If you stand there, you, the ground, and the air are moving eastward with speed of about 1000 miles per hour (1600 kilometers per hour) around a huge circle every 24 hours. If you stand at a higher latitude, you will travel eastward around a smaller circle every 24 hours, so the speed is less. The greater the latitude, the slower the eastward speed.<br/><br/>Suppose you had a very slippery ice lane that extended northward from, say, the middle of the United States. Send an ice puck northward along the center of the lane. When you release it, the puck has a certain speed northward --- say, 5 meters per second. It also has a large eastward speed because of Earth’s rotation.<br/><br/>As the puck moves northward, its eastward speed does not change because it is not attached to the ground but the eastward speed of the ice lane beneath it, which is attached to the ground, steadily decreases. If we watched this process from space, we would see that the center of the lane fails to keep up with the puck as they both move eastward. However, from the ground view, we interpret the situation differently --- the puck would seem to be deflected to the right, away from the center line and toward the right side of the lane. This would be strange because there is no apparent force causing the deflection. That imaginary force is the Coriolis force.<br/><br/>This rightward deflection is easier to see on a rotating merry-go-round instead of a sphere:<br/><br/><a href="https://www.youtube.com/watch?v=mPsLanVS1Q8">https://www.youtube.com/watch?v=mPsLanVS1Q8</a><br/><br/>If the merry-go-round rotates counterclockwise, the strange deflection is rightward. Clockwise rotation gives a leftward deflection. In the Northern Hemisphere, there is rightward deflection on flowing air and water. In a large storm system, such as a hurricane, air flowing toward the low pressure center (eye) from any direction is deflected rightward, setting up a counterclockwise rotation. In the Southern Hemisphere the deflection is leftward and the storms swirl clockwise.<br/><br/><a href="https://www.youtube.com/watch?v=i2mec3vgeaI">https://www.youtube.com/watch?v=i2mec3vgeaI</a><br/><br/>According to popular belief, the same deflection and swirling should occur in a draining bathtub. However, any Coriolis deflection of the water moving toward the drain is so tiny that the turbulence already in the water dominates the drainage, and it can cause swirling in either direction. If you give the water near the plug a clockwise swirl with your hand and then pull the plug, the water will drain while swirling clockwise. A counterclockwise swirl with your hand results in a counterclockwise swirling. If you let the water stand for a while, the turbulence can die out and then you might have a shot at seeing the Coriolis effect. For a large tub, the water needs to be undisturbed for at least a day.<br/><br/>How does the woman pull off the Coriolis scam? She uses a small tub with only a bucket-full of water, puts it on the equator, and then leaves the water undisturbed for a while to get rid of any turbulence. When she pulls the plug, the water flows directly to the drain and out. Then she moves the demonstration to the south. The Coriolis force and deflection are zero exactly on the equator. At the new location they are so tiny that they can be approximated as being zero and absolutely cannot affect the water drainage.<br/><br/>So, how does she get the anticipated clockwise swirling? She pours in the water on the <em>left</em> side of the tub so that it swirls clockwise around the tub. The swirling near the surface and side walls quickly decreases but the swirling near the center remains. A few seconds later, after she pulls the plug, the swirling becomes apparent, especially when she throws in the floaters near the top of the swirl.<br/><br/>When she moves the demonstration to the north side of the equator, she pours in the water on the <em>right</em> side of the tub so that it swirls counterclockwise. It is still swirling that way when she pulls the plug and throws in the floaters.<br/><br/>Who thought of this trick? I don’t know but I bet it was a physics student who knew about the Coriolis force from class and who needed some extra money from the tourists.<br/><br/>My favorite demonstration of the Coriolis force is already at the FCP site. A man pours tea from a container into a cup while standing on a rotating platform. From practice the man has learned to anticipate the strange deflection of the falling tea stream so that he has the cup in the correct position to catch the tea. Moreover, he can catch the tea while spinning in either direction. This man has an intuitive feel for the Coriolis effect.<br/><br/><a href="http://www.wimp.com/icedtea/">http://www.wimp.com/icedtea/</a><br/><br/>When bullets or artillery shells are fired over a long range, Earth’s rotation during the object’s flight must be taken into account. Here is a video that shows the effect on rifle shots at targets at a distance of 1000 yards (914 meters). When the target is directly eastward, the bullets hit higher than center (bull’s eyes) because Earth’s rotation toward the east moves the target downward during the flight. Shooting westward, the bullets hit low.<br/><br/><a href="https://www.youtube.com/watch?v=jX7dcl_ERNs">https://www.youtube.com/watch?v=jX7dcl_ERNs</a><br/><br/>If you have the time, here is a 1960 movie about frames of reference that move relative to each other. I remember very little about my high school days (far too much teenage angst clouds my memory), but I distinctly remember this movie. In fact, it was probably one of the reasons I went into physics.<br/><br/><a href="https://www.youtube.com/watch?v=aRDOqiqBUQY">https://www.youtube.com/watch?v=aRDOqiqBUQY</a>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-68763257340186723582015-01-14T21:04:00.000+05:302015-03-18T11:20:34.226+05:30Physics Videos<div><iframe id="dm_jukebox_iframe" style="overflow:hidden; margin:0; padding:0; width: 480px; height: 365px;" width="480" align="center" frameborder="0" marginwidth="0" marginheight="0" src="http://www.dailymotion.com/widget/jukebox?list[]=/en/relevance/creative-official/search/physics&skin=default&autoplay=1&logo=0&no_tabs=1&syndication=234175"></iframe><br/><a style="font-size: 10px; color: #193D5E; text-decoration: none;" href="http://www.dailymotion.com" target="_blank" title="Powered by Dailymotion">Powered by <span style=" text-decoration: underline;">Dailymotion</span></a></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-38220934768880810742015-01-01T18:30:00.000+05:302015-03-18T11:21:53.312+05:30Cbse Class XII AISSCE 2015 date sheet publishedCBSE published the datesheet for class XII for AISSCE 2015. Download it <a title="CBSE Class XII datesheet 2015" href="http://cbse.nic.in/attach/12d_2015.pdf" target="_blank">here</a>...<br/>http://cbse.nic.in/attach/12d_2015.pdf<br/><span class="post_sig"> Get free help in physics at www.plustwophysics.com</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-7923171210120310563.post-43880642163518764792014-11-30T17:38:00.000+05:302015-03-18T11:21:53.284+05:30Magnetic memory filmed in slow motion by ScientistsThe scientists at DESY (<b>Deutsches Elektronen-Synchrotron</b>) used high-speed photography to film one of the candidates for the magnetic data storage devices of the future in action. The film was taken using an X-ray microscope and shows magnetic vortices being formed in ultrafast memory cells.<br/><br/><a href="http://commons.wikipedia.org/wiki/File:Vxa-tape-v17-top-front.jpg" target="_blank"><img class="zemanta-img-inserted zemanta-img-configured" title="English: VXA V17 tape cartridge for magnetic t..." src="http://www.plustwophysics.com//upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Vxa-tape-v17-top-front.jpg/350px-Vxa-tape-v17-top-front.jpg" alt="English: VXA V17 tape cartridge for magnetic t..." width="350" height="329" /></a><br/><br/>Their work, which has been reported by the scientists surrounding Dr. Philipp Wessels of the University of Hamburg in the journal <i>Physical Review B</i>, provides a better understanding of the dynamics of magnetic storage materials. Magnetic memory cells are found in every computer hard drive.<br/><br/>Read more at <a href="http://phys.org/news/2014-11-scientists-magnetic-memory-super-slow-motion.html" target="_blank">http://phys.org/news/2014-11-scientists-magnetic-memory-super-slow-motion.html</a>Unknownnoreply@blogger.com0