Tuesday, March 29, 2011

Investigatory Project reintroduced in CBSE Physics Curriculum

CBSE has reintroduced Investigatory Projects in Physics wef AISSCE 2013. This would be applicable for students who are in class XI during the academic year 2011 - 12 and writing the Board Exam in 2013.

The activities are now for demonstration purpose only. A student is supposed to perform a minimum of 15 experiments in a year.

For exam, he/she has to perform 2 experiments; one from section A and one from section B.


 1 To study various factors on which the internal resistance/emf of a cell depends.

2. To study the variations, in current flowing, in a circuit containing a LDR, because of a variation. (a) in the power of the incandescent lamp, used to 'illuminate' the LDR. (Keeping all the lamps at a fixed distance). (b) in the distance of a incandescent lamp, (of fixed power), used to 'illuminate' the LDR.

3. To find the refractive indices of (a) water (b) oil (transparent) using a plane mirror, a equiconvex lens, (made from a glass of known refractive index) and an adjustable object needle.

4. To design an appropriate logic gate combinatin for a given truth table.

5. To investigate the relation between the ratio of (i) output and input voltage and (ii) number of turns in the secondary coil and primary coil of a self designed transformer.

6. To investigate the dependence, of the angle of deviation, on the angle of incidence, using a hollow prism filled, one by one, with different transparent fluids.

7. To estimate the charge induced on each one of the two identical styro foam (or pith) balls suspended in a vertical plane by making use of Coulomb's law.

8. To set up a common base transistor circuit and to study its input and output characteristic and to calculate its current gain.

9. To study the factor, on which the self inductance, of a coil, depends, by observing the effect of this coil, when put in series with a resistor/(bulb) in a circuit fed up by an a.c. source of adjustable frequency.

10. To construct a switch using a transistor and to draw the graph between the input and output voltage and mark the cut-off, saturation and active regions.

11. To study the earth's magnatic field using a tangent galvanometer.

Thursday, March 17, 2011

Physics Tutors register now to get listed here!

We are starting a Physics Tutor section soon.

The Physics tutors all over India  (as well as those outside India) can now send their details along with a nominal fee for permanent listing with us.

Further details and address for communication will be intimated after verification.


Apply with details now to admin@plustwophysics.com

Tuesday, March 15, 2011

Beautiful Carving on Watermelon

See the beautiful carvings made on watermelon

If you're going through hell, keep going








"If you're
going through hell, keep going"

- Winston Churchill

The innovative ideas  are brought into practice by entrepreneurs, but to bring their dream and imagination to reality is a difficult task. They are literally going through hell while they try to realize their dreams and imaginations. Many withdraw and dispose off the already begun business when difficulties arise. Success goes to those who go on, despite the hardships.

"When you live for a strong purpose, then hard work isn’t an option. It’s a necessity."

Says Steve Pavlina

IIM Students Received Fat Pay Cheques In 2011

At the conclusion of final IIM placements, students heaved a sigh of relief as a number of them underwent month-long procedure to secure job offers. This year, the graph of job offers rose with better salary packages. IIM-Kozhikode saw the total number of offers increasing to 305 from 265 last year. On the other hand, IIM Indore saw its offers increase to 241 this year, from 235 in the last year. The ‘Finance Campus of India’ IIM Calcutta got 31.3% of job offers from the finance sector.

Harvard University Ranked First, Oxford Second In The World


According to a research, Harvard University has been given the top rank and Oxford stands second in the list. Cambridge still enjoys the reputation of one of the most esteemed universities in the world. Japan’s Tokyo University landed at eighth position in the list. As per the latest figures of The Times Higher Education, none of the Indian Universities found place in top 100.

No MBBS Entrance Exam For Students In Tamil Nadu

The Tamil Nadu Government said there would be no entrance exams for MBBS in the state for 2011-12. Students will be considered only on the basis of the marks obtained by them at 10+2 level. Previously, Supreme Court had given its approval to the Medical Council of India (MCI) to conduct Common Entrance Examination for admission to MBBS across the country. However, state government challenged Madras High Court MCI notification which was willing to make all entrance test compulsory for admission to MBBS and got a stay on January 6 this year.

21 Fake Universities And 350 Educational Institutions Identified By UGC

UGC or University Grants Commission has identified 21 fake universities and educational institutions running across India. Out of these 21 institutes, 8 are in U.P., 6 in Delhi and one each in Madhya Pradesh, Karnataka, Bihar, Kerala, Maharashtra, Tamil Nadu and West Bengal. Apart from this, AICTE has brought to light 350 unapproved institutions running technical and management courses against AICTE regulations. The lists of such institutions have been updated at the official websites of UGC and AICTE.


Monday, March 14, 2011

Download Social Science Study materials for Class X CBSE

CBSE Class X Social Science Study materials.

Social Science for Class X

1. Who followed the policy of Golden Mean?a. Matternich b. Mazzini  c. Louis Philippe d. Duke of Orleans

2. Napoleonic Code was introduced in the year ofa.1809 b.1807b.1805 d.1804

3. What was Helairia Philike ?a. A Secret Society b. A Political Partyc. A custom Union d. An  Allegori

4. Who founded the revolutionary militia ‗Red Shirt‘?a. Wilson b. Tsar Alexander IIc. Garibaldi d. Matternich

5. Who was Frederick Sorrieu?a. A Revolutionary b. Chancellor of Austriac. King of Frame d. French Artist

6. Vienna Congress was convened in 1815 for what purpose?a. To declare completion of German Unification.b. To restore conservative regime in Europe.c. To declare war against France.d. To start the process of Italian unification.

7. Which year was known as the year of dear bread?a. 1830 b. 1848 c. 1789 d. 1815

8. Name the state which led the process of Italian unification?a. Rome b. Prussiac. Sardinia Piedmont d. Vienna

9. Who said Cavour, Mazzini, Garibaldi: three her brain, her soul, her sword ?a. Victor Emmannual b. George Meredithc. Louis XVIII d. Guizot

10. Zollverein was aa. Diplomatic institution b. Custom unionc. Administrative union d. Trade union

11. Who followed the policy of Blood and Iron for national unification?a. Garibaldi b. Otto Von Bismarkc. Mazzini d. Matternich

12. United Kingdom of Great Britain came into existence in the year -a. 1789 b. 17984 | P a g ec. 1707 d. 1801

13. Who said that, Italy was merely a geographical expression?a. Cavour b. Napoleonc. Matternich d. Guizot

14. Which one was not included in the Balkan Region?a. Croatia b. Bosnia Harzegovinac. Serbia d. Spain

15. In which century nationalism emerged in Europea. 16thcentury b. 20thcenturyc. 19thcentury d. 17thcentury

16. Who was the king of France at the time of French Revolution?a. Marie Antoniate b.  Louis XVIc. Czar   Nicolas d.  Edward  II



1. c

2. d

3. a

4. c

5.  d

6. b

7. b

8. c

9. b


11. b

12. c

13. c

14.  d

15.  c

16. b

Sunday, March 13, 2011

India Has An Efficient System To Provide Tsunami Warnings: Official

India has introduced an effective system to provide tsunami warnings after the disaster struck the country in 2004, a senior government official said.
Excluding the lack of tsunami warning system in the country, Secretary Ministry of Earth Sciences Secretary Shailesh Naik said the Indian National Centre for Ocean Information Services (INCOIS) is a world-class tsunami warning system.
"This has proven to be a time when we were able to make his first run, just seven minutes after the earthquake ground in Japan exclude the threat of tsunamis in the Indian Ocean, when the U.S. tsunami warning system, the National Oceanic and Atmospheric Administration (NOAA)) gave the first alarm for 12 minutes after a strong earthquake near the coast of Honshu, "he said.
India tsunami warning system, which was established after the devastating Indian Ocean tsunami in 2004, will assess the information received seismic stations, sea-level, bottom pressure recorders (tsunami buoys), and to anticipate changes water level provided in various locations.
"When a large earthquake, the tsunami warning system can provide in 10 minutes, not only in India but also in other neighboring countries," said Naik.
Rs 125 crore tsunami warning center system was established in 2007 in Hyderabad INCOIS is estimated at 25 to 30 earthquakes in the last three years.

Kungfu Originated in Kerala, IN

Wednesday, March 9, 2011

Can mobile phone cause Cancer?

The city is flooded with mobile phones and no one will be happy without a mobile phone. The news coming in newspapers and from other sources warn us about the disasters caused by the overuse of mobile phones.

But so far there is no convincing evidence in this regard.

Have some evidence? Post here as comment

Class XI Physics Chapter wise Revision Test - Gravitation and Waves






Questions 1 to 5 carries one mark each

Questions 5 to 10 carries 2 marks each

Questions 10 to 15 carries 3 marks each

Questions 16 and 17 carries 5 marks each


  1. What are mechanical waves?

  2. The time period of a vibrating source producing sound is 0.01 s. If the velocity of sound is 340 ms -1 calculate wave length

  3. State the principle of superposition of waves

  4. Why is gravitational potential energy negative?

  5. What is geosynchronous satellite?

  6. Derive a relation between wave velocity, frequency and wavelength

  7. What are transverse and longitudinal wave motions? Give an example for each type

  8. What is the effect of pressure on the speed of sound? Justify your answer.

  9. What is a progressive wave? Write an expression which represents a progressive wave.

  10. State the conditions necessary for a satellite to appear stationary.

  11. Define orbital velocity. Derive an expression for it.

  12. Define acceleration due to gravity. Show that the value of ‘g’  decreases with altitude or height

  13. State the laws of vibrations of stretched strings.

  14. Derive an expression for the escape velocity of a satellite projected from the surface of the earth.

  15. What is the maximum value of potential energy that can be possessed by a heavenly body? Give the general expression for potential energy of an object  near the surface of earth

  16. State Kepler’s law of planetary motion. Deduce Newton’s law of gravitation from Kepler’s law.

  17. (a)What is Doppler Effect?  (b) Derive an expression for the apparent frequency when a source moves towards a stationary observer.  (c) A policeman on duty detects a drop of 15% in the pitch of the horn of a motor car as it crosses him. Calculate the speed of car, if the velocity of sound is 330 m/s


Class XI Physics Revision Tests - Thermodynamics



Max marks 35

Time 1 ½ hrs

Questions 1 to 5: 1 mark  each

Questions 6 to 10: 2 marks each

Questions 11 to 15: 3 marks each

Question 16: 5 marks

  1. What is an isochoric process?

  2. On what factors does the efficiency of a Carnot engine depend?

  3. State second law of thermodynamics. (Any one statement)

  4. State zeroth law of thermodynamics.

  5. What is a heat engine?

  6. State first law of thermodynamics and apply it to an isothermal process.

  7. Explain why a balloon is cooler after it bursts.

  8. What is a PV diagram? What does the area between the PV curve and the volume axis signify?

  9. State the conditions for two bodies to be in thermal equilibrium.

  10. State Carnot’s theorem and explain its significance.

  11. What is a cyclic process? Show that the work done in a cyclic process is equal to the area enclosed by the loop representing the cyclic process.

  12. Why gases have two principal specific heat capacities? Define them

  13. Why Cp > Cv? Prove that Cp - Cv = R

  14. Define the coefficient of performance of a heat pump. (refrigerator) and obtain a relation for it in terms of temperature T1 and T2

  15. A sample of gas (γ = 1.5) is compressed adiabatically from a volume of 1600 cm3 to 400 cm3.  If the initial pressure is 150 kPa, what is the final pressure and how much work is done on the gas in the process?

  16. Explain the construction and various operations involved in a Carnot’s heat engine with neat labeled diagram. Draw Carnot’s cycle and write expression for efficiency of a Carnot’s heat engine.



Sunday, March 6, 2011

Now a site for PlusTwo Chemistry too ...

How was the CBSE Chemistry Paper 2011 ? Click Here to respond
Visit http://chemistry.2lv.in for Free help in Chemistry.

The site is just started and aims at helping students up to plus Two to get free online help in Chemistry.

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Latest post at chemistry.2lv.in

AISSCE Chemistry 2008 question paper and marking scheme


Physicist turns to arts - Prof. Walter Lewin

In the Video below, famous Physicist and teacher Professor Walter Lewin shares his personal insights on arts of 2oth century.


“At the turn of the century we’ve reached a point that beauty is no longer an issue. Now you may find some of these works beautiful, but the intention of the artists that you’ve just seen, was definitely not to paint something that was beautiful. They wanted to introduce a new way of looking at the world, and they did that in different ways.

Friday, March 4, 2011

MBA CET 2011 Strayed From Its Traditional Format

In a surprise move, Maharashtra’s management common entrance test (MBACET) changed its pattern this year. Normally, considered a simpler option to the Common Admission Test (CAT) and the Management Entrance Test (MET), MBA CET 2011 was overall difficult with lots of changes in the ways questions are generally asked in the paper. It is expected that qualifying scores for the exam will also drop this year.

AIEEE 2011 Is Rescheduled From April 24 to May 1

The Central Board of Secondary Education (CBSE) that conducts the All India Engineering/Architecture Entrance Examination (offline/pen & paper), 2011 has rescheduled the exam from April 24, 2011 to May 1, 2011 due to the festival of Easter.

Finance Minister Rains Hefty Grants To Leading Academic Institutions In India

Finance Minister, Mr. Pranab Mukherjee has granted special grants to following universities and institutions for academic year 2011-12:
    Rs 10 crore each for setting up Kolkata and Allahabad Centres of Mahatma Gandhi Antarrashtriya Hindi Vishwavidyalaya, Wardha;

    Rs 10 crore for Centre for Development Economics and Ratan Tata Library, Delhi School of Economics, Delhi;

    Rs 10 crore for Madras School of Economics;

    Rs 100 crore as one-time grant to the Kerala Veterinary and Animal Sciences University at Pookode, Kerala;

    Rs 20 crore for IIM, Kolkata, to set up its Financial Research and Trading Laboratory;

    Rs 20 crore for Rajiv Gandhi National Institute of Youth Development, Sriperumbudur, Tamil Nadu;

    Rs 200 crore as one time grant to IIT, Kharagpur;

    Rs 200 crore for Maulana Azad Education Foundation; and

    Rs 50 crore each for Aligarh Muslim University’s upcoming centres at Murshidabad in West Bengal and Malappuram in Kerala.


Video : The art of physics demonstrations

Tuesday, March 1, 2011

How was the CBSE PlusTwo Physics Question paper (AISSCE 2011)

Dear all students who wrote AISSCE Physics 2011,

How was the Physics Question paper?

Was it difficult? Very easy?

Were there questions out of syllabus?

Were there any errors?

Whatever be your opinion, post them as comments here; It will certainly reach the concerned authorities.

So, be quick, post your response now!

You can also post the questions from the question paper which you consider erroneous or out of course.

The pages 2 to 15 of set 1 are given here for easy reference

Page 2

Page 3

Page 4

Page 5

Page 6

Page 7

Page 8

Page 9

Page 10

Page 11

Page 12

Page 13

Page 14

Page 15