24-05-2014, 11:12 AM
Physics-II Question Wave Theory Of Light
Wave Theory .docx (Size: 54.5 KB / Downloads: 17)
Q.] Select & write the most appropriate answer from the given Alternatives for
each sub-question.
1) In vacuum, speed of light does not depends on------------------------
a) frequency b) speed of observer c) speed of source d) All of the above.
2) luminiferous ether medium was suggested by the scientist--------------------
a) Newton b) Young c) Maxwell d) Huygen’s
3) Which of the following does not support the wave nature of light-------------
a) Polarisation b) diffraction c) Photoelectric effect d) Interfecence
4) According to Huygen’s wave theory, the locus of the point in the same state
of vibration is called--
a) ray of light b) wavenormal c) wavelength d) wavefront.
5) If the angle of incidence & angle of refraction are same, then ratio of size of
incident & refracted
Wavefront is-------------------
a) 2:1 b) 1:1 c) 1) 1:2 d) 1:3
6) A ray is incident at an angle with the surface is 380The angle between
normal & reflected ray is----
a) 350 b) 550 c) 900 d) 520
7) A ray is reflected at an angle of 300,if the angle of incidence becomes
doubled, the angle of Reflection will be-------------------
a) 160 B) 600 C ) 300 D) 1200
8) The intensity at point is directly proportional to-----------------
b) amplitude b) Inversely proportional to amplitude c) square of amplitude
d) Inversely proportional to square of amplitude .
9) Wavelength of light of frequency 100Hz is (Ca=3X108 m/s)-----------------------
a) 2X106m b) 4X106m c) 3X106m d) 5X106m
10) The velocity of light is maximum in----------------------
a) air b) vacuum c) diamond d) water.
11) When a ray of light is passes form denser to rarer then, it’s Velocity is------------------
a) increases b) decreases c) remains constant d) zero
12) The critical angle is minimum when a ray passes from-------------------
a) glass to water b) air to glass c) water to glass d) glass to air
13) In case of refraction of light for normal incidence-----------------
a) I=0 then r=900 b) I=900 then r=0 c) I= 0 then r=0 d) I=900 then r=900
14) A normal drawn to the surface of wavefront in a direction of propagation is called-----
a) wavefront b) spherical wavefornt c) plane wavefront d) wavenormal
15) The Brewster’s law is given by----------------------
a) µ=tan2ip b) µ=tanip c) µ=√tanip d) µ=sinip
16) The wavelength of light in water is 4000A0 & in glass is 2500A0 the R.I. of glass
w.r.t. water is----
a) 1.8 b) 1.6 c) 0.625 d) 1.1
17) The red light of wavelength of 6400 A0 in air has wavelength of 4000A0 in glass. If
the wavelength Violet in air is 4400A0 it’s wavelength of light in glass is--------------
a) 3750 A0 b) 2500 A0 c) 2750 A0 d) 4000 A0
18) The wave number of light in the medium of R.I. 1.6 is 2.5X106m-1 the wavelength in
air is-----------
a) 5000A0 b) 6400 A0 c) 6000A0 d) 5600 A0
19) Which of the following properties exhibit that light waves are transverse in nature?---
a) interference b) diffraction c) polarization d) all of the above.
20) The phenomenon which does not take place in sound waves---------------
a) interference b) diffraction c) polarization d) Scattering of light.
21) The R.I. of glass w.r.t. air is 1.5 what is the R.I. of air w.r.t. glass?--------------
a) 1.3 b) 1.5 c) 1.1 d) 0.6667
22) The wavelength of monochromatic ray of light is 4560 A0 in air & 3638A0 in a
medium the ratio of Velocities of light in air & medium is-------------------------
a) 1/25 b) 4/5 c) 5/4 d) 9/8
23) An unpolarised bean of transverse waves is one whose vibrations-------------------
a) confined to a single plane b) occur in all directions c) occur in all directions
perpendicular totheir direction of motion. D) occur parallel to the direction of
propagation.
24) The restriction of vibration confined only in direction is called as-----------------
a) interference b) diffraction c) polarization d) wavenormal
25) When the light source is moving towards an observer-----------------
a) wavelength of light decreases b) Wave of light increases c) remains
unchanged d) zero.
26) A wave originating from a infinite source of light is called------------------
a) spherical wavefront b) plane wavefront c) cylindrical wavefront
d) wavenormal
27) If the critical angle of medium is sin-1(3/5), the angle of polarization is--------------
a) 5002’ b) 5803’ c) 5902’ d) 5303’
28) The plane in which vibration of plane polarized take place is called-------
a) Wavenormal b) plane of polarization c) plane of vibration d) wavefront.
29) A light in vibration of electric vector take place in all possible direction is called------
a) plane wavefornt b) plane polarized light c) unpolarised light d) none of these.
30) If plane wavefront propagates , it’s radius of curvature is------------------
a) increases b) decreases c) first increase & then Decreases d) remains constant.
31) A ray of light is incident at an angle of incidence 350 the angle between reflecting
Surface & reflected ray is-----------------
a) 350 b) 550 c) 900 d) 580
32) We can see the object due to-----------------
a) refraction b) reflection c) diffraction d) interference
33) Huygen’s theory cannot explain the phenomenon of-------------------
a) reflection b) refraction c) interference d) Compton effect.
34) polarides glass is used in sun glasses because-------------------
a) it is cheaper b) it is fashionable c) it has good colour d) it decreases the
intensities of light.
35) The Doppler’s effect is used for----------------------
a) sound waves only b) light waves only c) both a & b d) Neither a nor b
36) Which of the following cannot be polarized--------------------
a) Radio waves b) X-rays c) Ultraviolet rays d) Ultrasonic waves
37) When light travels from rarer to denser medium the width of wavefront is-------------
a) decreases b) increases c) remains constant d) both a & b
38) The R.I. of water & glass w.r.t. air is 1.3 & 1.5 respectively, then R.I. of glass w.r.t.
Water is----------------
a) 15/26 b) 15/13 c) 26/15 d) 13/15
39) R.I. diamond w.r.t. Acohol is denoted by---------------------
a) aµd b) dµAl c) dµg d) Alµd
40) According to wave theory of light, different colours of light is due different--------
a) amplitudes b) frequency c) wavelength d) Phase.
41) The intensity of beam of light is obtained by it’s-------------------
a) velocity b) amplitude c) wavelength d) frequency
42) The wavefront originating from a point source of light at finite distance is called as--
a) plane wavefornt b) cylindrical wavefront c) Spherical wavfront
d) wavenormal
43) When the light source is moving towards an observer then wavelength of light is-----
a) decreases b) increases c) remains constant d) finite.
44) Which of the following material is used for producing polariods---------------------
a) Quartz b) Calcite c) tourmaline crystal d) Quinine iodosulphate.
45) The light in which vibration of electric vector take place in one plane is called as-----
a) unpolarised light b) plane polarized light c) reflection of light d) none of these.
46) The angle of incidence at which reflected light is completely polarized is called-------
a) polarizing angle b) plane angle c) solid angle d) none of these
47) The direction of wave normal along which light travel is called-------------------
a) reflection of light b) refraction of light c) diffraction of light d) ray of light.
48) When a ray of light passes air medium to denser medium then it’s speed &
Wavelength is------------------------
a) Increases b) decreases c) remain constant d) increases then decreases
49) The R.I. of glass & water w.r.t. air is 3/2 & 4/3 respectively. The R.I. of glass w.r.t.
Water is---------------------
a) 8/9 b) 9/8 c) 7/8 d) 5/4
50) In vacuum, speed of light depends upon---------------------------
a) frequency b) wavelength c) intensity of light d) none of these.