Physics - Questions and Answers, General Study (GK)

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191.

Sound moves with higher velocity if

(a)pressure of the medium is decreased

(b)temperature of the medium is increased

(c)humidity of the medium

(d)both (b) and (c)

Comment

Answer is: DNA

192.

Radar waves are sent towards a moving aeroplane and the reflected waves are received. When the aeroplane is moving towards the radar, the wavelength of the wave

(a)decreases

(b)increases

(c)remains the same

(d)sometimes increases or decreases

Comment

Answer is: ANA

193.

An echo will be heard if the minimum distance between the source of sound and obstacle is

(a)10 m

(b)1 m

(d)17 m

Comment

Answer is: DNA

194.

Which of the following types of wave is used by computed tomography employed for visualization of the internal structure of human body?

(a)X-rays

(b)Sound waves

(c)Magnetic resonance

(d)Radioisotopes

Comment

Answer is: ANA

195.

Consider the following statements
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal waves only.
Which of the statement(s) given above is/are correct?

(a)only 1

(b)only 2

(c)both 1 and 2

(d)neither 1 and 2

Comment

Answer is: BNA

196.

The light wave is

(a)mechanical wave

(b)non-mechanical wave

(c)either mechanical or non-mechanical wave depends upon the medium through which it passes

(d)none of these

Comment

Answer is: ANA

197.

When a stone is dropped on the surface of still water, the waves produced are

(a)longitudinal

(b)transverse

(c)stationary

(d)partly transverse and partly longitudinal

Comment

Answer is: DNA

198.

Velocity of sound in air
1. Decreases with temperature
2. Increases with temperature
3. Increases with pressure
4. is independent of pressure
5. is independent of temperature
Which of the above are true?

(a)2 and 3

(b)1, 2 and 3

(d)1, 2, 3 and 4

Comment

Answer is: CNA

199.

Which one of the following does TV remote control unit use to operate a TV set?

(a)Light waves

(b)Sound waves

(c)Microwaves

(d)Radio waves

Comment

Answer is: DNA

200.

A noise level of 100 decibel would correspond to

(a)sound from a noisy street

(b)just audible sound

(c)noise from a machine shop

(d)ordinary conversation

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 20

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