set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Solar cells generate little amount of electricity, but are becoming popular because

a) it can be set up in remote and inaccessible hamlets without laying transmission lines

b) electricity generated from solar cells can be stored and used when required

c) its raw material Silicon is available in large quantities in India

d) All of these

Question : 3

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 : 4

Which one among the following radiations carries maximum energy?

a) Gamma-rays

b) X-rays

c) Ultraviolet rays

d) Infra-red rays

Question : 5

Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas?

a) It’s portable

b) It’s cleaner

c) It’s safer

d) It’s cheaper

Question : 6

In the photoelectric effect, electrons are emitted:

a) With a maximum velocity proportional to the frequency of the incident radiation.

b) At a rate that is independent of the emitter.

c) At a rate that is proportional to the amplitude of the incident radiation.

d) Only if the frequency of the incident radiations is above a certain threshold value.