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Q.1
The unit of magnetic flux is the
Henry
Tesla
Faraday
Weber
Q.2
Resolving power of a telescope is
1.22λ2a\frac{1.22λ}{2a}2a1.22λ
2a1.22 λ\frac{2a}{1.22\ \lambda}1.22 λ2a
(2nsinβ)1.22λ\frac{\left(2n\sin\beta\right)}{1.22\lambda}1.22λ(2nsinβ)
1.22λ2n sinβ\frac{1.22\lambda}{2n\ \sin\beta}2n sinβ1.22λ
Q.3
Two light sources are coherent when:
their amplitudes are same
their frequencies are same
their wavelengths are same
their frequencies are equal and their phase difference is constant
Q.4
In young's double slit experiment
all fringes have same thickness
central bright is of double width
central fringe is intense
thickness of fringes decreases gradually
Q.5
Resolving power of microscope depends upon
(a) wavelength of light used (directly proportional)
b) wavelength of light used (inversely proportional)
(c) frequency of light used
d) focal length of objective
Q.6
Surrounding every moving electron is
(a) a magnetic field
(b) an electric field
(c) both of these
(d) none of these
Q.7
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
Q.8
Two coherent sources of light can be obtained from
Two different lamps
Two different lamps but of the same colour
Two different lamps of the same colour and having the same colour
None of these
Q.9
Resolving power of a microscope is
1.22λ2a\frac{1.22λ}{2a}2a1.22λ
2a1.22 λ\frac{2a}{1.22\ \lambda}1.22 λ2a
(2nsinβ)1.22λ\frac{\left(2n\sin\beta\right)}{1.22\lambda}1.22λ(2nsinβ)
1.22λ2n sinβ\frac{1.22\lambda}{2n\ \sin\beta}2n sinβ1.22λ
Q.10
Coherent sources have
same frequency
constant or zero phase difference
both a and b
none of these
Q.11
In the young's double slit experiment, if monochromatic light is replaced by white light , then
no fringes are observed
all bright fringes become white
all bright fringes have colours between violet and red
only central fringe is white and all other fringes are coloured
Q.12
The fringe width in YDS expt on a screen which is placed at a distance offrom the slits 10-apart when light used has wavelength 6 X 10-7 m , is equal to :
3 X 10-10 m
3 X 10-4 m
6 X 10-10 m
6 X 10-4 m
Q.13
If the ratio of amplitudes of two interfering waves is 4 : 3 , then the ratio of maximum and minimum intensity is :
16 : 18
18 : 16
49 : 1
94 : 1
Q.14
In YDS expt , the intensity on the screen at a point where path difference is λ is K. what will be the intensity at the point where path difference is ( λ /4)
K / 4
K / 2
K
zero
Q.15
The phenomenon of diffraction can be exhibited by :
Infrared waves
microwaves
X - rays
all of these
Q.16
Light of wavelength 2 X 10-3 m falls on a slit of width 4 X 10-3 m. The angular dispersion of the central maximum will be :
300
600
900
1800
Q.17
Waves that cannot be polarised are:
light waves
electromagnetic waves
transverse waves
longitudinal waves
Q.18
Two polaroids are kept crossed to each other. Now one of them is rotated through an angle ofThe percentage of incident light now transmitted through the system is:
15 %
25 %
50 %
60 %
Q.19
The fringe width of bands in YDS expt can be increased by:
decreasing the wavelength of light used.
decreasing the distance between the two sources
increasing the distance between the two sources
dipping the apparatus into water
Q.20
The dual nature of light is exhibited?
diffraction and photoelectric effect
photoelectric effect
refraction & interference
diffraction & reflection
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