1000+ TNPSC Physics Gk Questions and Answers - 1

Question: 1

Audio frequency range

(A) lies below 20 HZ

(B) lies above 20,000 HZ

(C) lies between 20-2000 Hz

(D) lies between 20-20000 kHz

Ans: C

lies between 20-2000 Hz

Question: 2

A receiving antenna converts

(A) electromagnetic energy into electrical energy

(B) electrical signal into electromagnetic energy

(C) electrical signal into sound energy

(D) sound energy into electromagnetic energy

Ans: A

electromagnetic energy into electrical energy

Question: 3

An important term in amplitude modulation is

(A) audio signal factor

(B) carrier wave factor

(C) modulation factor

(D) none of the above

Ans: C

modulation factor

Question: 4

Which part of the electromagnetic wave is used for communication purpose?

(A) Radiowaves only

(B) Microwaves only

(C) Both a and b

(D) Infrared rays only

Ans: C

Both a and b

Question: 5

In amplitude modulation

(A) modulating frequency lies in the audio range

(B) the amplitude of the carrier varies in accordance with the frequency of the modulating signal.

(C) the amplitude of the carrier wave remains constant.

(D) the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal.

Ans: D

the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal.

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