light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 21 [BPSC (Pre) 1997]

The velocity of sound in air is approximately

a) 10 mile/min

b) 330 m/s

c) 10 km/s

d) 3 × $10^10$ m/s

Answer: (b)

Question : 22

Resonance is an example of

a) free vibration

b) tuning fork

c) forced vibration

d) damped vibration

Answer: (c)

Question : 23

When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of

a) diffraction and transmission

b) reflection and diffraction

c) reflection and transmission

d) refraction, diffraction and transmission

Answer: (d)

The reason CDs reflect rainbow colours is because they have a clear plastic coating on top of a mirrored surface.

Light refracts (bends) when it moves from one medium (such as air) to another with a different optical density (such as the clear plastic surface of a CD).

Different wavelengths of light (every colour has a different wavelength) travel at different speeds so that the full spectrum appears when white light passes from the air through the plastic surface of a CD, separating light rays which are then reflected back to us by the mirrored centre surface of a CD.

Here the diffraction and transmission also take place because diffraction of light rays occurs when it strikes the surface of CD and transmission is obvious when light enters from one medium to another.

The thickness of the different optical media, angle of source light, and brightness of source light all affect which rainbow patterns are visible on a CD.

Question : 24 [BPSC (Pre) 1995]r

Sea seems blue due to

a) Blue colour of water

b) Reflection of sky and scattering of light by the drops of water

c) Excess deepness

d) Upper layer of wate

Answer: (b)

Question : 25 [UPPCS (Mains) 2013]

An astronaut cannot hear his companion at the surface of the Moon because

a) Temperature is too low during night and too high during day

b) There is no medium for sound propagation

c) Produced frequencies are above the audio frequency

d) There are many craters on the surface of the Moon

Answer: (b)

IMPORTANT general science mcq EXERCISES

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1647 light thermodynamics sound optics and oscillations based general science mcq set 9 question answer pdf
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