set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

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 : 3

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 : 4

Consider the following statements in respect of India advanced satellite INSAT–4A:

1. INSAT-4A was launched in December, 2005 from New Mexico.
2. The European Commercial Launch Service Provider Arianespace was associated with the launch of INSA T-4A.
3. Tata-Sky; a digital cable service provider; is associated with DTH television broadcasting service from INSA T 4A.

a) 1 and 2

b) 2 and 3

c) 1, 2 and 3

d) 1 and 3

Question : 5

Repeaters used in telephone links are:

a) Oscillators

b) Amplifiers

c) Rectifiers

d) Transformers

Question : 6

Which one among the following radiations carries maximum energy?

a) Gamma-rays

b) X-rays

c) Ultraviolet rays

d) Infra-red rays