MCQ On Class 12 Physics Chapter 10 Wave Optics

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Questions
1 The velocity of light in air is 3 * 108 ms-1 and that in water is 2.2 * 108 ms” . The polarising angle of incidence is
A 45°
B 50°
C 53.74°
D 63

Answer:53.74°
2 To observe diffraction, the size of the obstacle
A should beX/2, where X is the wavelength.
B should be of the order of wavelength.
C has no relation to wavelength.
D should be much larger than the wavelength.

Answer:should be of the order of wavelength.
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3 Two slits in Young’s double slit experiment have widths in the ratio 81 :1. The ratio of the amplitudes of light waves is
A 3 :1
B 3 : 2
C 9 :1
D 6:1

Answer:9 :1
4 The phenomena which is not explained by Huygen’s construction of wavefront
A reflection
B diffraction
C refraction
D origin of spectra

Answer:origin of spectra
5 Which of the following is correct for light diverging from a point source?
A The intensity decreases in proportion with the distance squared.
B The wavefront is parabolic.
C The intensity at the wavelength does not depend on the distance.
D None of these.

Answer:The intensity decreases in proportion with the distance squared.
6 The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of
A 106 rad
B 10-2 rad
C 10-4 rad
D 10-6 rad

Answer:10-6 rad
7 A laser beam is used for locating distant objects because
A it is monochromatic
B it is not chromatic
C it is not observed
D it has small angular spread.

Answer:it has small angular spread.
8 Light propagates rectilinearly, due to
A wave nature
B wavelengths
C velocity
D frequency

Answer:wave nature
9 When interference of light takes place
A energy is created in the region of maximum intensity
B energy is destroyed in the region of maximum intensity
C conservation of energy holds good and energy is redistributed
D conservation of energy does not hold good

Answer:conservation of energy holds good and energy is redistributed
10 The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is
A 2000 Å
B 4000 Å
C 1000 Å
D 3000 Å

Answer:4000 Å
11 In a double slit interference pattern, the first maxima for infrared light would be
A at the same place as the first maxima for green light
B closer to the centre than the first maxima for green light
C farther from the centre than the first maxima for green light
D infrared light does not produce an interference pattern

Answer:farther from the centre than the first maxima for green light
12 The idea of secondary wavelets for the. propagation of a wave was first given by
A Newton
B Huygens
C Maxwell
D Fresnel

Answer:Huygens
13 In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:
A 0.4 mm
B 0.5 mm
C 0.6 mm
D 0.8 mm

Answer:0.6 mm
14 In Young’s double slit experiment, the central point on the screen is:
A bright
B dark
C first bright and later dark
D first dark and later bright

Answer:bright
15 In vacuum, the speed of light depends upon :
A frequency
B velocity
C wave length
D None of these

Answer:None of these
16 Polarization of light prove the :
A corpuscular nature of light
B quantum nature of light
C Transverse wave nature of light
D Longitudinal wave nature of light

Answer:Transverse wave nature of light
17 The angle of minimum deviation of a prism depends upon the aggie of:
A incidence
B reflection
C prism
D none of these

Answer:prism
18 Polaroid glasses is used in sun glasses because :
A It reduces the light intensity to half on account of polarization
B It is fashionable
C It has good colour
D It is cheaper

Answer:It reduces the light intensity to half on account of polarization
19 The minimum value of the refractive index is:
A zero
B 1
C less than 1 but not zero
D more than 1

Answer:less than 1 but not zero
20 C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?
A scattering
B diffraction
C interference
D polarisation

Answer:scattering

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