set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Television signal cannot be received generally beyond a particular distance due to

a) weakness of antenna

b) weakness of signal

c) curvature of the Earth

d) absorption of signal in air

Question : 2

The phenomenon of high and low tides and the difference in sea levels give________.

a) Tidal energy

b) Wave energy

c) Hydel energy

d) Thermal energy

Question : 3

Which among the following statements are the requirements of good source of energy?

1. It should do a large amount of work per unit volume or mass.
2. It should be easily accessible.
3. It should be easy to store and transport.
4. It should be economical.

a) A, B, C

b) B, C, D

c) A, B

d) All of thesegenerator.

Question : 4

Which one of the following is the correct sequence of the wavelengths of radiations ?

a) IR > Green > UV > Hard X-rays

b) UV > Hard X-rays > IR > Green

c) UV > Green > IR > Hard X-rays

d) IR > Hard X-rays > Green> UV

Question : 5

Match the Column I and Column II.

a) (A) → (2); (B) → (1); (C) → (4); (D) → (3)

b) (A) → (1); (B) → (2); (C) → (3); (D) → (4)

c) (A) → (3); (B) → (1); (C) → (2); (D) → (4)

d) (A) → (1); (B) → (3); (C) → (2); (D) → (4)

Question : 6

Select the correct statement(s) from the following.

1. In conductors, the valence and conduction bands may overlap.
2. Substances with energy gap of the order of 10 eV are insulators.
3. The resistivity of a semiconductor increases with increase in temperature.
4. The conductivity of a semiconductor increases with increase in temperature.

a) I and III only

b) I, II and IV

c) I and II only

d) I, II, III and IV