set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Repeaters used in telephone links are:

a) Oscillators

b) Amplifiers

c) Rectifiers

d) Transformers

Question : 2

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 : 3

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 : 4

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 : 5

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.

Question : 6

The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called

a) visible radiation

b) infrared radiation

c) ultraviolet radiation

d) microwave radiation