Physics MCQs GK objective Questions GK test Set – 63

Question 1.

If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to __.

A. 300 m
B. 30 m
C. 3 m
D. 0.3 m

Ans: A. 300 m

Question 2.

The waveform of a certain signal can be studied by

A. Spectrometer
B. Cathode ray oscilloscope
C. P – n junction diode
D. Sonometer

Ans: D. Sonometer

Question 3.

Quality of transmission depends upon

A. Nature of signal only
B. Nature of medium only
C. Both (A) and (B)
D. Neither A nor B

Ans: C. Both (A) and (B)

Question 4.

Waves that are required for long distance wireless communication are

A. Infrared rays
B. Ultraviolet rays
C. Radio waves
D. Microwaves

Ans: C. Radio waves

Question 5.

The GPS device in an automobile uses which communication channel?

A. Satellite
B. Microwave
C. Radio frequency
D. Infrared

Ans: A. Satellite

Question 6.

Circuit breaker usually operate under

A. After D. C. component has ceased
B. Transient state of short-circuit current
C. Sub-transient state of short-circuit current
D. Steady state of short-circuit current

Ans: B. Transient state of short-circuit current

Question 7.

A television channel is characterised by

A. Frequency of transmitted signal
B. Velocity of transmitted signal
C. Physical dimension of television screen
D. Size of picture tube

Ans: A. Frequency of transmitted signal

Question 8.

In a optical fibre cable, the signal is propagated along the

A. Inner Core
B. Cladding
C. Both core and cladding
D. Surface and cladding

Ans: A. Inner Core

Question 9.

The resistance of the human body (dry condition) is of the order of

A. 101 Ohm
B. 102 Ohm
C. 103 Ohm
D. None of these

Ans: D. None of these

Question 10.

What is found in frequency modulation ?

A. Fixed frequency
B. Fixed dimension
C. Change in frequency and dimension
D. Change in dimension only

Ans: A. Fixed frequency

Question 11.

The audio signals of TV are

A. Amplitude modulated
B. Frequency modulated
C. Unmodulated
D. Velocity modulated

Ans: B. Frequency modulated

Question 12.

Which component of an IED creates an electrical charge?

B. Fuse
C. Explosive
D. Power source

Ans: D. Power source

Question 13.

Positive feedback is used in

A. Amplifiers
B. Rectifiers
C. Oscillators
D. None of these

Ans: C. Oscillators

Question 14.

In radio-communication, the signals emitted by transmitting antenna are reflected on

A. Stratosphere
B. Ozonosphere
C. Ionosphere

Ans: C. Ionosphere

Question 15.

A multimeter is used to measure

A. Current
B. Voltage
C. Resistance
D. All of the above

Ans: D. All of the above

Physics GK MCQs all set

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