Electronics and Communications TNPSC Group 2 2A Questions

Electronics and Communications MCQ Questions

1.
Which of the following electronic devices is used for digital displays in electronic calculators?
A.
photo diodes
B.
Zener diodes
C.
LCDs
D.
None of these
ANSWER :
C. LCDs
2.

Given below are two statements, an Assertion (A) and Reason(R ).

Assertion (A) : Transformer is useful for stepping up or stepping down voltages.

Reason(R ): Transformer is a device used in D.C. circuits.

A.

Both A and R are true, and R is the correct explanation of A

B.

Both A and R are true, but R is not the correct explanation of A

C.

A is true, but R is false

D.

A is false but R is true

ANSWER :

C. A is true, but R is false

3.
Pure silicon is used in
A.
Electronics industry
B.
Textile industry
C.
Paint industry
D.
Pharmaceuticals
ANSWER :
A. Electronics industry
4.
An antenna
A.
converts short waves into long waves
B.
absorbs heat
C.
converts heat into light
D.
converts radio waves into electrical signals and vice versa
ANSWER :
D. converts radio waves into electrical signals and vice versa
5.

Analyse the statements and choose the correct answer:

Assertion (A): A particle moves along a circle.

Resertion (R-I ): speed is uniform.

                 (R-II ): Velocity is changing

A.

R-I is correct, R-II is wrong

B.

R-I is wrong R-II is correct

C.

R-I and R-II are wrong

D.

Both are correct

ANSWER :

D. Both are correct

6.

A fuse is used in mains electric supply as a safety device.

Which one of the following statements about the fuse is correct?

A.

It is connected in parallel with the main switch

B.

It is made mainly from silver alloys

C.

It must have a low melting point

D.

It must have a very low resistance

ANSWER :

C. It must have a low melting point