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 : Heat travels through vacuum by

(a) Radiation

(b) Conduction

(c) Convection

(d) Both (a) and (b)

The correct answers to the above question in:

Answer: (a)

Heat radiations are electromagnetic waves of high wavelength.

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

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 : 2

Resonance is an example of

a) free vibration

b) tuning fork

c) forced vibration

d) damped vibration

Answer: (c)

Question : 3

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 : 4

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.

Question : 5

Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then

a) solid sphere will expand more than the hollow one

b) both spheres will expand equally

c) hollow sphere will expand more than the solid one

d) None of the above

Answer: (b)

Question : 6

The Sun is visible to us a few minutes before the actual sunrise because of

a) Total internal reflection of light

b) Diffraction of light

c) Scattering of light

d) Refraction of light

Answer: (d)

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