set 9 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Resonance is an example of

(a) free vibration

(b) tuning fork

(c) forced vibration

(d) damped vibration

The correct answers to the above question in:

Answer: (c)

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Question : 1

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 : 2

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 : 3

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)

Question : 4

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 : 5

Heat travels through vacuum by

a) Radiation

b) Conduction

c) Convection

d) Both (a) and (b)

Answer: (a)

Heat radiations are electromagnetic waves of high wavelength.

Question : 6

The fine powder of a coloured glass is seen as

a) black

b) coloured

c) white

d) that of the glass colour

Answer: (c)

All colours are reflected.

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