Light, Sound and Heat TNPSC Group 2 2A Questions

Physics

Light, Sound and Heat MCQ Questions

1.
The speed of light will be minimum while passing through
A.
glass
B.
vacuum
C.
water
D.
air
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ANSWER :
A. glass
2.
"Decibal" is a unit of
A.
sound intensity
B.
Light
C.
Heat
D.
Electricity
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ANSWER :
A. sound intensity
3.
The unit of refractive index is
A.
Metre
B.
Degree
C.
No unit
D.
Second
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ANSWER :
C. No unit
4.
Light year is the unit of
A.
distance
B.
time
C.
weight
D.
intensity of light
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ANSWER :
A. distance
5.
The unit of power of a lens is
A.
decibal
B.
pascal
C.
diopter
D.
stoke
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ANSWER :
C. diopter
6.
Doppler effect in sound produces apparent change in
A.
amplitude
B.
frequency
C.
wavelength
D.
intensity
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ANSWER :
B. frequency