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52-year-old millionaire mayor came to give the matriculation examination

At a time when people discontinue studies for various reasons, 59-year-old Mayor Shiv Singh of Bharatpur set an amazing example before the world ! Mayor Shiv Singh arrived at the first examination center where students and administrators stirred in. But as a student when they set their seat so everyone understood the matter.

bharatpur_mayorHe explains that in the years 1971-72 he stopped studying for any reason, and it always aggrieved him.

Flying squad

When the flying squad arrived for checking in the middle of exams, they asked him to remove the shoe. Mayer took shoes off without any argument to support them.

Mayor Shiv Singh is a millionaire …

Shiv Singh of 59 years, Mayor of Bharatpur are among the richest people and has many business in the city including petrol pumps.


Cbse Class XII AISSCE 2015 date sheet published

CBSE published the datesheet for class XII for AISSCE 2015. Download it here

Click to access 12d_2015.pdf

Get free help in physics at www.plustwophysics.com

Random collection of Physics Viva Questions

  1. State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
  2. How can we increase the sensitivity of a potentiometer?
  3. Define figure of merit of a galvanometer.
  4. Which has more resistance – a galvanometer or a milliammeter?
  5. How does an LED emit light?
  6. What is the difference between an ordinary diode and an LED?
  7. Define principal axis of a convex lens?
  8. What happens to the focal length of a concave mirror if it is immersed in water?
  9. What are the factors affecting the internal resistance of a cell?
  10. What are the difference between primary and secondary cell?
  11. Why can’t we use a dry cell for starting a car?
  12. What happens to the resistivity of a wire when it is doublefolded?
  13. How does the resistance of a wire depend on its dimensions?
  14. Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 etc?
  15. Why constantan or manganin wires are used for making the resistance coils in resistance box?
  16. What is a standard resistance?
  17. What are the characteristics of a standard resistance?
  18. What are the precautions to be observed while doing electricity experiments in general?
  19. What is a galvanometer?
  20. What is the resistance of an ideal ammeter?
  21. Why is ammeter always connected in series and voltmeter always connected in parallel?
  22. How can we convert a galvanometer into an ammeter or a voltmeter?
  23. What is shunt?
  24. What is AVO meter?
  25. What is the effect of temperature on the resistance of a conductor?
  26. Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
  27. What is conductance?
  28. What are non ohmic devices? give an example.
  29. What are superconductors?
  30. Define emf
  31. Why emf is said to be a misnomer?
  32. What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
  33. If you find that the galvanometer reading is shaky, what error can you expect?
  34. What do you mean by figure of merit of a galvanometer?
  35. Why a moving coil galvanometer is called so?
  36. What is the principle of a galvanometer?

Which way is better for giving AIEEE exam? ONLINE or OFFLINE.

Which way is better for giving AIEEE exam? ONLINE or OFFLINE.

-Yash asked –


I would personally recommend online. But the choice is up to you.

Please follow the following check to decide. Try to identify for yourself the plus points and negative points of writing AIEEE online and OFFLINE.

The most important disadvantage of choosing the OFFLINE version is the rarity of choices. You may have to travel long if you are not nearby the centre.

The decision is yours. But, think well before you decide.

Does gravity travel instantaneously?

Does gravity travels instantaneously? Or it travels equal to the speed of light.


No clear answer now. If we believe in the Theory of relativity, Gravity (Gravitational Waves travel with the same speed as that of light in vacuum. If gravitons are like photons, then it makes sense too.

However I invite you to think more and post your thoughts as comments here. Let the discussion begin.

I found the following links to know more

  • http://metaresearch.org/cosmology/speed_of_gravity.asp
  • http://en.wikipedia.org/wiki/Speed_of_gravity
  • http://www.desy.de/user/projects/Physics/Relativity/GR/grav_speed.html

Speed of sound

Why sound travels faster in humid air than normal air as humid air is denser than normal air? (Akash asked)


The speed of sound in a medium is inversely proportional to the square root of its density. Humid air is less dense than dry air. Therefore the speed of sounf in humid air is greater than that in dry air.


Are you thinking why dry air is more than that of humid air? This is a common misconception. Students used to think that humid air is denser than dry air. But it is not so. Just like skimmed milk (milk removed off its cream) is more dense than normal milk (with cream). Density of cream is much less than that of the rest of milk. So when it is removed, the residual milk becomes denser.

Humid air contains water vapor content. Water vapor is lighter than air. So when air contains water vapor, its density is less. When the water content is removed, it becomes denser.

For more details refer:

What is present in between the atoms of gases?

What is present in between the atoms of gases?

(Aniket Mukherjee asks)

Answer: Nothing. Vacuum

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