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Old June 5th, 2016, 10:22 AM
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Default Re: KVPY Class 12 Sample Papers

Hey as per your demand here I am providing you KVPY Class 12 Sample Papers for practice

Here I am giving you qus paper for physics
What are the orders of drift velocity for normally applied potentials (0 to 5V) and that of random thermalspeed at room temperature say (300 K).
The drift velocity is of the order of 10m per second whereas random thermal velocity of electrons is ofthe order of 10
5metre per second.
What is the conventional direction of flow of current in a metallic conductor ?
The conventional direction of flow of current is taken as the direction of flow of positive charge fromhigher potential to lower potential.
What is meant by ampere hour capacity of a cell ?
It is a measure of the electricity capacity of a cell, i.e., how much quantity of electricity, a cell is capableof supplying. It is measured by the product amperes x hours.
What do you mean by 10 A× h ?
10 A× h means, the cell will supply 1 A current upto 10 hours. 2 A current upto 5 hours or 0.5 A current upto 20 hours.
Which one is greater e.m.f. or terminal voltage across the cell ?
The e.m.f. is greater than the terminal voltage across the cell
Is it possible in any case where p.d. > e.m.f. of the cell ?Ans.Yes, at the time of charging of the cell
Can you measure e.m.f. of a cell with a voltmeter ?
No, because it requires some current from the cell for its reading. (it is measured by potentiometer)

When is the Wheatstones bridge said to be most sensitive ?
When all the four resistances P, Q, R and S are of nearly the same order of magnitude.

How can you measure alternating current ?
Heating effect of current, Q =2
Rt is independent of the direction of flow of current because would always be positive. Therefore, Hot Wire ammeter is used for this purpose.
Suppose you have been given two tuning forks of the same metal on which marks of the frequency have disappeared. How will you detect the one with higher frequency ?
The one which has smaller prongs will be of higher frequency.
What do you mean by a note ? How does it differ from a tone ?
A tone is simple sound resulting from a pure simple harmonic motion. On the other hand a note is acomplex sound made up of a complex periodic motion as obtained by the superpositions of a number ofpure simple harmonic motions.
If the prongs of a fork are rubbed with a file slightly or prong of tuning fork is loaded with wax than whatwill be the change in frequency in both the cases.
Frequency will decreases in both the cases
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