set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which gas is filled in normal tubelights?

a) Mercury vapour with argon

b) Sodium vapour with argon

c) Sodium vapour with neon

d) Mercury vapour with neon

Question : 2

Regarding a semiconductor which one of the following is wrong?

a) There are no free electrons at 0K

b) The number of free electrons increases with rise of temperature

c) There are no free electrons at room temperature

d) The charge carriers are electrons and holes

Question : 3

The energy band gap is maximum in

a) superconductors

b) insulators

c) metals

d) semiconductors

Question : 4

Consider the following statements

1. Clear sky appears blue due to poor scattering of blue wavelength of visible light.
2. Red part of light shows more scattering than blue light in the atmosphere.
3. In the absence of atmosphere, there would be no scattering of light and sky will look black.

a) Only 3

b) Only 1

c) 1 and 2

d) All of these

Question : 5

When an iron bar is moved over a bar magnet along its length the attractive force

a) remains same

b) increases first and then decreases

c) decreases first and then increases

d) cannot say

Question : 6

Magnetic meridian is a

a) vertical plane

b) point

c) horizontal plane

d) line along N-S