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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
MCQ Questions for CBSE Class 5 with Answers
MCQ Questions for CBSE Class 4 with Answers
MCQ Questions for CBSE Class 3 with Answers
MCQ Questions for CBSE Class 2 with Answers
MCQ Questions for CBSE Class 1 with Answers
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Wave Optics Class 12 MCQ Questions With Answers
1.
A diffraction grating that has 2000 slits per centimetre is used to measure the wavelengths emitted by hydrogen gas. At what angle in the first order spectrum would you expect to find the violet line that has a wavelength of 434 nm?
3°3\degree3°
5°5\degree5°
7°7\degree7°
9°9\degree9°
2.
Total internal reflection only occurs when light tries to travels from a medium with a _____ index to ____ index
lower to higher
higher to lower
same to same
3.
Dimensions for a point source are important.
True
False
4.
If it takes a waves 2.0 s to travel a distance of 10 meters, what is the wave speed?
0.2 m/s
5 m/s
12 m/s
20 m/s
5.
What must be true about waves which reflect off of fixed boundaries?
Their amplitude increases.
Their wavelength increases.
They become inverted.
They remain erect.
6.
If a wave from one slit of a Young's double-slit experiment set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point?
dark fringe
bright fringe
multi-colored fringe
gray fringe, neither bright nor dark
7.
When light travels from air into another medium with a higher index of refraction, what happens to the speed at which it travels.
it increases
it decreases
it remains constant
this is impossible
8.
______________________ occurs when waves combine to create a wave with a LOWER amplitude.
Diffraction
Constructive interference
Destructive interference
Refraction
9.
For diffraction at a single Slit, the angular position for nth secondary maxima is
θ=nλ\theta=n\lambdaθ=nλ
θ= nλa\theta=\ \frac{n\lambda}{a}θ= anλ
θ= (n+12)λa\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}θ= (n+21)aλ
θ= naλ\theta=\ \frac{na}{\lambda}θ= λna
10.
Bending of light at sharp edges of obstacles is due to
polarization
diffraction
refraction
interference
11.
A point source of light creates..... ........... wavefront
cylindrical
plane
spherical
parabolic
12.
As per Huygens principle, wavelets originating on a wavefront grow with
slow speed
same speed
more speed
none of these
13.
LCD uses the phenomenon of
dispersion
diffraction
interference
polarization
14.
In youngs double slit experiment if entire apparatus is immersed in water the fridge width would
decrease
increase
not change
none of the above
15.
If on rotating an analyser there no variation in the intensity of light then the light is
plane polarized
unpolarized
partially polarized
extra ordinary
16.
The height of a wave from the undisturbed state is called
frequency
amplitude
period
crest
17.
The dual nature of light is exhibited?
diffraction and photoelectric effect
photoelectric effect
refraction & interference
diffraction & reflection
18.
Superposition of family of waves originating from a slit forms......... pattern
interference
diffraction
polarization
dispersion
19.
The angle of incidence at which reflected light is totally polarised for reflection from air to glass ( refractive index n)
sin-1 (n)
sin-1 (1 / n)
tan-1 (1 / n)
tan-1 (n)
20.
What is path difference for destructive interference?
(a) nλ
(b) n(λ +1)
(c) (2n + 1)λ/2
(d) (n +1)λ/2
21.
Which of the following phenomenon is not explained by Huygen’s wave theory?
Diffraction
Interference
Polarisation
Photoelectric effect
22.
For diffraction at a single Slit, the angular position for nth minimum is
θ=nλ\theta=n\lambdaθ=nλ
θ= nλa\theta=\ \frac{n\lambda}{a}θ= anλ
θ= (n+12)λa\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}θ= (n+21)aλ
θ= naλ\theta=\ \frac{na}{\lambda}θ= λna
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