Question 1.
What is the reason for twinkling of stars ?
A. Dispersion of light
B. Total internal reflection
C. Atmospheric reflection
D. Atmospheric refraction
Ans: D. Atmospheric refraction
Question 2.
The absolute refractive index of any medium is always:
A. More than one
B. 0
C. 1
D. Less than one
Ans: A. More than one
Question 3.
The phenomenon of change in direction of light when it passes from one medium to another is called
A. Propagation
B. Reflection
C. Refraction
D. Dispersion
Ans: C. Refraction
Question 4.
Which one of the following processes is responsible for the glittering of air bubble rising through water?
A. Reflection of light
B. Refraction of light
C. Total internal reflection of light
D. Scattering of light
Ans: C. Total internal reflection of light
Question 5.
The basic reason for the extraordinary sparkle of suitably cut diamond is that
A. It has well defined cleavage planes
B. It has a very high transparency
C. It has a very high refractive index
D. It is very hard
Ans: C. It has a very high refractive index
Question 6.
Lens is made up of
A. Pyrex glass
B. Flint glass
C. Ordinary glass
D. Cobalt glass
Ans: B. Flint glass
Question 7.
The refractive index of a transparent medium is maximum for
A. Red light
B. Violet light
C. Yellow light
D. Green light
Ans: B. Violet light
Question 8.
The increasing order of the refractive index of certain materials is (left to right) __
A. Rocksalt, Benzene, Kerosene, Ice
B. Rock Salt, Ice, Benzene, Kerosene
C. Ice, Kerosene, Benzene, Rock Salt
D. Kerosene, Ice, Benzene, Rock Salt
Ans: C. Ice, Kerosene, Benzene, Rock Salt
Question 9.
Refractive Index of glass with respect to water is
A. 4/3
B. 9/8
C. 2/3
D. 8/9
Ans: B. 9/8
Question 10.
‘Mirage’ is an example of
A. Refraction of light only
B. Total internal reflection of light only
C. Refraction and total internal reflection of light
D. Dispersion of light only
Ans: C. Refraction and total internal reflection of light
Question 11.
What type of lens is a magnifying glass?
A. Diverging
B. Spherical
C. Converging
D. Achromatic
Ans: C. Converging
Question 12.
Which color deviates least when passing through a Prism
A. Blue
B. Green
C. Yellow
D. Red
Ans: D. Red
Question 13.
Which of the following colour of light deviates least through the prism?
A. Yellow
B. Green
C. Violet
D. Red
Ans: D. Red
Question 14.
Mirage is due to
A. Magnetic disturbances in the atmosphere
B. Equal heating of different parts of the atmosphere
C. Unequal heating of different parts of the atmosphere
D. Depletion of ozone layer in the atmosphere
Ans: C. Unequal heating of different parts of the atmosphere
Question 15.
Which of the following is not caused by atmospheric refraction of light ?
A. Sun appearing red at sunset
B. Twinkling of stars at night
C. Sun appearing higher in the sky than it actually is
D. Sun becoming visible two or three minutes before actual sunrise
Ans: C. Sun appearing higher in the sky than it actually is
Question 16.
Which color deviates highest when passing through a Prism
A. Indigo
B. Green
C. Violet
D. Orange
Ans: C. Violet
Question 17.
Bending of light rays in denser medium is termed as:
A. Reflection
B. Dispersion
C. Refraction
D. Deflection
Ans: C. Refraction
Question 18.
A water tank appears shallower when it is viewed from top due to
A. Rectilinear propagation of light
B. Reflection
C. Total internal reflection
D. Refraction
Ans: D. Refraction
Question 19.
Why does water tank appear shallower when viewed from the top?
A. Due to reflection
B. Due to refraction
C. Due to diffraction
D. Due to total internal reflection
Ans: B. Due to refraction
Question 20.
A pond of water appears less deep due to
A. Reflection
B. Diffraction
C. Refraction
D. Polarisation
Ans: C. Refraction
Physics GK MCQs all set
- Physics MCQs Set-1
- Physics MCQs Set-2
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- Physics MCQs Set-74
- Physics MCQs Set-75
- Physics MCQs Set-76
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