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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Total internal reflection
(b) Refraction
(c) Interference
(d) Polarisation
The correct answers to the above question in:
Answer: (a)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Suppose a rocketship is proceeding from the Earth at a speed of 2/10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth?
a) Yellow
b) Orange
c) Blue
d) Yellow-Orange
Answer »Answer: (a)
Question : 2
By the first law of thermodynamics, for solids
a) δQ = δW + dU
b) dQ = dU + dW
c) dQ = dU
d) δQ = δU / dW
Answer »Answer: (a)
Question : 3
In human eye, image of object forms at
a) Pupil
b) Iris
c) Cornea
d) Retina
Answer »Answer: (d)
Question : 4
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 »Answer: (b)
Question : 5
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 »Answer: (b)
Question : 6
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 »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.
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