Physics – Objective questions –Light -For SSC/Rail/Postal

 

Dear Readers,We are presenting Physics Questions for upcoming  Rail/Postal/SSC Exams. We will more questions in forthcoming posts.

PHYSICS – Topic wise objective questions on  Light   – Set-3

 

SL NO.
QUESTIONS
Answers
1
The wave length of visible light are between
.4 micrometer to .7 micrometer
2
What is the nature of light
Both wave and particle nature
3
The transverse nature of light is shown by
Polarization of light
4
Longitudinal waves do not exhibit which phenomenon
Polarization
5
Which types of waves are used in a night vision apparatus ?
Infra-red-waves
6
Velocity of light is maximum in
Vaccum
7
The focal length of a plane mirror is
infinity
8
An observer moves towards a plane mirror with a speed of 2 m/s. The speed of the image with respect to the observer is

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4 m/sec
9
A boy is placed between two plane mirror inclined at angle of 60 degree . The number of image formed is
5
10
An object is placed between two parallel mirrors . The number of images formed i
Infinity
11
The nature of image formed by a plane mirror is
 
12
A virtual image larger than the object can be formed by which mirror or lens
Concave mirror
13
Which mirror or lens produce a virtual image smaller in size than the objects ?
Concave lens & Convex mirror
14
Which produce a virtual image longer in size than the object ?
Convex lens & concave mirror
15
A person standing in front of mirror finds his image thinner but with normal height.

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Convex and cylindrical with axis vertical
16
A real image is formed by a convex lens. If we put a concave lens in contact with it, the combination again forms a real image . The new image will be
Is farther from the lens system
17
In the case of hypermetropia , where is image will be formed
The image of a near object is formed behind the retina
18
An object is placed 10 cm in front of convex mirror of focal length 20 cm . The distance of he image from the mirror is
20/3 cm
19
A convex mirror is used to form an image or a real object .What is the features will be image
Always lies between the pole and the focus, is diminished in size, is erect
20
The image of a object formed by device is always virtual and small . The device may be
Concave lens
21
As an object gets closer to the focal point  of a converging lens from infinity , its image  will be formed
Gets farther from the lense
22
Image formed by a convex spherical mirror is
Virtual
23
Which form a virtual and erect image for all position of the object
Concave lens & Convex mirror
24
An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm the image produced is
Real, inverted and of the same size as the object
25
How many image will be formed if two mirror are fitted adjacent walls and one mirror on ceiling
7
26
In a compound microscope , the intermediate image is
Real, inverted and magnified
27
The image formed on the retina of human eye is
Real and inverted
28
When light passes from one medium to another, which  physical quantity  remain unchanged
frequency
29
When a monochromatic beam of light passes from a denser to a rarer medium ,then what is effect
Velocity increases
30
A well cut diamond appears bright because
Of total reflection
31
Total internal reflection can occur when light tends to pass from
A denser to a rare medium
32
Mirage is observed in a desert due to the phenomenon of
Total reflection
33
Chromatic aberration in a lens is caused by which phenomenon
Dispersion
34
The phenomenon of splitting white light into seven colours is called
Dispersion
35
A water tank appears shallower when it is viewed from top due to
refraction
36
Which phenomenon is used in optical fibres
Total internal reflection
37
Splitting of white light into seven colours is due to
Refraction
38
Blue colour of the sky is consequence of
Scattering
39
Colours of thin films are due to
Interference of light
40
When viewed in white light , soap bubbles show colours because of
Interference of light
41
Rainbow is formed due to a combination of
Dispersion and total internal reflection
42
Which phenomenon can be attributed to the refraction of light ?
Twinkling of stars, mirage ,rainbow
43
Light waves projected on oil show colours due to
Interference
44
To an observer  on the earth the stars appear to twinkle . This can be described to  which features
The refractive index fluctuations in earth’s atmosphere
45
A lens, immersed in a liquid becomes in visible when
the refractive index of the lens is equal to the refractive index of the liquid
46
Total internal reflection can take place  when light travels from
Diamond to glass
47
Diffusion of light in the atmosphere take place due to
Dust particles
48
Critical angle of light passing from glass to water is minimum for which colour
Violet
49
For an austronaut in a space ship, the sky appears
Black
50
A red flower kept in green light will appear
Black
51
Focal length of a convex lens is maximum for which light
Red light
52
Which type of lights are are strongly absorbed by plants ?
Blue and red
53
When seen in green light , the saffron and green portions of our national flag will appear as
Black and green respectively
54
To an observer on h lunar surface the day times the sky will appear to be
Black
55
The primary colours in photography are
Red, blue , green
56
Why is red light employed for  danger signals
Red light is scattered least
57
Which light  has the longest wavelengh
Red light
58
Which light has the highest energy ?
Blue light
59
When lights enters from air to water , then its
Frequency is same but the wavelength is smaller
In water than in air
60
Total internal reflection of light is possible when the light enters from
Water to air
61
One cannot see through fog because
Light is scattered by the droplets in fog
62
If there were no atmosphere , the length of the day on the earth will
Decrease
63
The power of lens is 4 diopters at focal length is
25 cm
64
The focal length of a convex lens is 50 cm . Its power is
+2D
65
The power of lens is -2D.What is its focal length
.5 m
66
The focal length of the lens in a photographic camera is 5 cm. What is the power of  lens ?
+20 D
67
A far sighted person has a near point at 100 cm .What must be the power of the correcting lens ?
+3D
68
An object is kept 5 cm in front of a concave mirror of focal length 15 cm .What will be the nature of the image ?
Virtual, magnified
69
The maginifying power of a telescope can be increased by
Reducing the focal length of the eye piece
Astigmatism for a human eye can be removed by using
Cylindrical lens
70
The head mirror used by E.N.T doctors is
Concave
71
A convex lens is immersed in a liquid of refractive index greater than that of glass . It will behave as a
Divergent lens
72
Air bubble in water behaves as a
Divergent lens
73
The illumination from the sun is greater at noon than in evening because
The rays of the sun are less oblique at noon that in the morning
74
Candela is unit of
Luminous intensity
75
The unit of luminous efficiency of an electric bulb is
Lumen /watt
76
When  a coin placed in a bowl of water is seen from above , it appears
Raised from its position
77
In which part of the eye lies the pigment, that decide the colour of the eyes of a person ?
Choroid

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