Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

The average momentum of a molecule in a sample of an ideal gas depends on:

1. Temperature.
2. Number of moles.
3. Volume.
4. None of these.

Force between the protons and neutrons in a nucleus is:

The bit rate for a signal, which has a sampling rate of 8 kHz and where 16 quantisation levels have been used is (a) 32000 bits/sec(b) 16000 bits/sec(c) 64000 bits/sec(d) 72000 bits/sec

A proton and an α -  particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ  sec to make 5 revolutions, then the periodic time for the α -  particle would be(a) 50 μ  sec(b) 25 μ sec(c) 10 μ  sec(d) 5 μ  sec

When electron beam passes through an electric field, they gain kinetic energy. If the same beam passes through magnetic field, then(a) Their energy increases(b) Their momentum increases (c) Their potential energy increases(d) Energy and momentum both remains unchanged

To produce magnified erect image of a far object, we will be required along with a convex lens, is(a) Another convex lens(b)  Concave lens  (c) A plane mirror (d)  A concave mirror 

Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is (a) F(b) 3F/4(c) F/2     (d) F/4

Antimony and bismuth are usually used in a thermocouple, because(a) Negative thermal e.m.f. produced(b) Constant thermal e.m.f. produced(c) Lower thermal e.m.f. produced(d) Higher thermal e.m.f. produced

If a star is moving towards the earth, then the lines are shifted towards (a) Red   (b) Infrared(c) Blue   (d) Green