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Q.1
If a wave's speed is 5m/s and it has a wavelength of 2.5m, what is it's frequency?
12.5Hz
2.5Hz
7.5Hz
2Hz
Q.2
Twinkling of stars is due to
Scattering of light
Reflection of light
Refraction of light
All of above
Q.3
A real image is formed by a a convex lens, then it is put in contact with a concave lens and again a real image is formed. This image is : ______________
shift towards the lens system
shift away from the lens system
remain in its original position
shift to infinity
Q.4
Magnification of lens can be represented as M = .......
h'/h
-v/u
h/h'
either (a) or (b)
Q.5
A mirror used as surveillance mirrors in groceries and parking spaces
concave
convex
Q.6
For total internal reflection to take place ray of light should go from
Rarer to denser medium
Denser to rarer medium
Q.7
Which colour of light travels fastest in any medium except air ?
yellow
red
violet
white
Q.8
A boy uses blue colour of light to find the refractive index of glass. He then repeats the experiment using red colour of light.How will the refractive index of glass be ?
the same
μ decreases
μ increases
same as speed of light
Q.9
As the ray of light passes from air to glass, state how the wavelength of light changes.
wavelength increases
wavelength decreases
wavelength remains constant
wavelength decreases and then increases
Q.10
A monochromatic beam of light of wavelength λ passes from air into a glass block. choose the correct relation.
v = c / λ
v = λ / λ'
μ = c / v
λ / λ' = μ
Q.11
How is scattering of light proportional to wavelength
Directly
Inversely
Does not depend
Q.12
The speed of light in glass is 2 ×km/s. What is the refractive index of glass?
3 / 2
1.5
2 / 3
Both A & B
Q.13
Name the factors that affect the lateral displacement of light as it passes through a rectangular glass slab.
thickness of block
angle of incidence
refractive index of glass
All of above
Q.14
A plano convex lens (f = 20cm) is silvered at plane surface. Now f will be
20 cm
40 cm
10 cm
30 cm
Q.15
A ray of light is incident on a glass sphere of refractive index 1.5 . What should be the angle of incidence so that the ray which enters the sphere does not come out of the sphere?
Tan-1(2/3)
sin-1(2/3)
900
cos-1(2/3)
Q.16
Focal length of a convex lens will be maximum for
Blue light
Yellow light
Green light
Red light
Q.17
A double convex thin lens made of glass (refractive index = 1.has both radii of curvature of magnitudecm. Incident light rays parallel to the axis of the lens will converge at a distance L such that
L = 20 cm
L = 10 cm
L = 40 cm
L = 20 / 3 cm
Q.18
If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is _______________
4 cm
(√2 +1) cm
2√2 cm
( 2 + √2 ) cm
Q.19
The angle of incidence for an equilateral prism isWhat should be the refractive index of prism so that the ray is parallel to the base inside the prism?
1.414
1.732
1.33
9/8
Q.20
An object is held 9cm from a convex mirror and produces an image 6cm tall that is 4cm away from the mirror. What is the height of the object?
-13.5 cm
13 cm
2.7 cm
-2.7 cm
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