set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The transistor are usually made of

a) metals with high temperature coefficient of resistivity

b) metals with low temperature coefficient of resistivity

c) metal oxides with high temperature coefficient of resistivity

d) semiconducting materials having low temperature coefficient of resistivity

Question : 2

The waves used in telecommunication are

a) UV

b) Microwave

c) IR

d) Cosmic rays

Question : 3

Consider the following statements: At the present level of technology available in India, solar energy can be conveniently used to :

1. Supply hot water to residential buildings.
2. Supply water for minor irrigation projects.
3. Provide street lighting.
4. Electrify a cluster of villages and small towns.

a) 2 and 4 are correct

b) 1 and 3 are correct

c) 1, 2, 3 and 4 are correct

d) 1, 2 and 3 are correct

Question : 4

Space wave propagation is:

1. tropospherical propagation
2. sky wave propagation
3. line of sight propagation

a) 1 and 3

b) 2 only

c) 1 only

d) 2, 3 and 4

Question : 5

At absolute zero, Si acts as

a) metal

b) insulator

c) non-metal

d) None of these

Question : 6

Light Emitting Diode (LED) converts

a) electrical energy into light energy

b) thermal energy into light energy

c) light energy into electrical energy

d) mechanical energy into electrical energy