General Science | Physics | Light
General Science | Physics | Light
1. The wavelength extension of visible light is
Between 200-900 nm
Between 250-850 nm
Between 300-800 nm
Between 390-780 nm
Correct Answer
Wrong Answer
2. Human eye is most sensitive to visible light of the wavelength
6050 Å
5500 Å
4500 Å
7500 Å
Correct Answer
Wrong Answer
3. Which of the following radiations has the highest energy per quantum?
320-400 nm
200-280 nm
280-320 nm
400-600 nm
Correct Answer
Wrong Answer
4. The visible range of solar radiation is
100-400 nm
400-700 nm
740-10000 nm
None of the above
Correct Answer
Wrong Answer
5. The nature of radiation of light is
Like wave
Like particle
Like both of wave and particle
Like neither of wave nor of particle
Correct Answer
Wrong Answer
6. Light appears to travel in a straight line because
It consists of small particles
The velocity of light is very large
The wavelength of light is very small
Light is reflected by the surroundings
Correct Answer
Wrong Answer
7. Velocity of light is maximum in
Diamond
Water
Vacuum
Hydrogen
Correct Answer
Wrong Answer
8. The speed of light will be minimum while passing through
Glass
Vacuum
Water
Air
Correct Answer
Wrong Answer
9. The time taken to reach the Sunlight up to the surface of Earth is approximately
4.2 sec
4.8 sec
8.5 minutes
3.6 hours
Correct Answer
Wrong Answer
10. When light waves pass from air to glass the variable affected are
Wavelength, frequency and velocity
Velocity and frequency
Wavelength and frequency
Wavelength and velocity
Correct Answer
Wrong Answer
11. When light passes from one medium to another medium, which one of the following does not change?
Intensity
Velocity
Wavelength
Frequency
Correct Answer
Wrong Answer
12. Which one of the following energy conversions takes place in carrying out the process of photosynthesis?
Light to chemical energy
Light to thermal energy
Thermal to biochemical energy
Heat to kinetic energy
Correct Answer
Wrong Answer
13. The gas used in discharge tubes for optical decoration and advertising is
Carbon dioxide
Ammonia
Sulphur dioxide
Neon
Correct Answer
Wrong Answer
14. The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?
Total reflection and interference
Total refraction and dispersion
Diffraction and dispersion
Polarization and interference
Correct Answer
Wrong Answer
15. Total internal reflection can take place when light travels from
Diamond to glass
Water to glass
Air to water
Air to glass
Correct Answer
Wrong Answer
16. A cut diamond shines brilliantly due to
Some inherent property
Total internal reflection
Its molecular structure
Absorption of light
Correct Answer
Wrong Answer
17. Optical fibre works on the principle of
Total internal reflection
Refraction
Scattering
Interference
Correct Answer
Wrong Answer
18. In fibre optics communication, the signal travels in the form of
Light wave
Radio wave
Micro wave
Electric wave
Correct Answer
Wrong Answer
19. 'Endoscope' used by the doctors for examining the inside of patient's stomach, works on the principle of
Reflection of light
Dispersion of light
Refraction of light
Total internal reflection of light
Correct Answer
Wrong Answer
20. An endoscope is a
Narrow telescope
Type of camera
Simple microscope
None of the above
Correct Answer
Wrong Answer
21. The reason of mirage is
Interference of light
Diffraction of light
Polarization of light
Total internal reflection of light Mirage formation
Correct Answer
Wrong Answer
22. A cut diamond shines brilliantly due to
Total internal reflection
Absorption of light
Some inherent property
Its molecular structure
Correct Answer
Wrong Answer
23. The technique to integrate and mark the image of a three dimensional object is
Audiography
Lexieography
Photography
Holography
Correct Answer
Wrong Answer
24. Which of the following is used to take 3-dimensional pictures?
Photography
Holography
Radiography
None of these
Correct Answer
Wrong Answer
25. The generating images on a screen by focusing an electronic beam on phosphorus coated screen is called
Master Scan
Total Scan
Roster Scan
Radar Scan
Correct Answer
Wrong Answer
26. 'Raman effect' deals with the light rays passing through
Only fluids
Only prisms
Only diamonds
All transparent medium
Correct Answer
Wrong Answer
27. For reproducing sound, a CD (Compact Disc) audio player uses a
Quartz crystal
Titanium needle
Laser beam
Barium titanic ceramic
Correct Answer
Wrong Answer
28. When a CD (Compact disc used in audio and video systems) is seen in Sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of
Reflection and diffraction
Reflection and transmission
Diffraction and transmission
Refraction, diffraction and transmission
Correct Answer
Wrong Answer
29. Television signals cannot be received beyond a certain distance because
Signals are weak
Antenna is weak
Air absorbs signals
The surface of the Earth is curved
Correct Answer
Wrong Answer
30. The technique used to transmit auto signals in television broadcasts is
Amplitude Modulation
Frequency Modulation
Pulse Code Modulation
Time Division Multiplexing
Correct Answer
Wrong Answer
31. The image formed on Retina is
Equal to object but inverted
Smaller than object but straight
Smaller than object but inverted
Equal to object but straight
Correct Answer
Wrong Answer
32. Which type of image of an object is formed by eye lens of the retina?
Erect and Real
Erect and Virtual
Inverted and Real
Inverted and Virtual
Correct Answer
Wrong Answer
33. Direct viewing of Sun during total solar eclipse causes irreversible damage to eyes. The retinal burn is caused by which one of the following components of the Sun rays?
Heat
Rainbow light
Ultra-violet light
Infra-red light
Correct Answer
Wrong Answer
34. The colour of the star is an indication of its
Distance from the Earth
Temperature
Luminosity
Distance from the Sun
Correct Answer
Wrong Answer
35. Diffusion of light in the atmosphere takes place due to
Carbon dioxide
Dust particles
Helium
Water vapours
Correct Answer
Wrong Answer
36. For the myopic eye, the defect is cured by
Convex lens
Concave lens
Cylindrical lens
Toric lens
Correct Answer
Wrong Answer
37. The colour of light is determined by its
Amplitude
Wavelength
Intensity
Velocity
Correct Answer
Wrong Answer
38. Which one of the colours has the longest wavelength?
Green
Yellow
Blue
Red
Correct Answer
Wrong Answer
39. In the visible spectrum, the colour having the shortest wavelength is
Red
Yellow
Blue
Violet
Correct Answer
Wrong Answer
40. Which one among the following has the highest energy?
Blue light
Green light
Red light
Yellow light
Correct Answer
Wrong Answer
41. The Sun is visible to us a few minutes before the actual sunrise because of
Scattering of light
Diffraction of light
Total internal reflection of light
Refraction of light
Correct Answer
Wrong Answer
42. The Sun and the Moon appear elliptical near the horizon because of
Refraction
Optical illusion
Interference phenomenon
Their actual shape
Correct Answer
Wrong Answer
43. Photosynthesis using the invisible part of the Sunlight is done by some
Trees
Algae
Bacteria
Fungi
Correct Answer
Wrong Answer
44. Red light is used in traffic signals because
It has the longest wavelength
It is beautiful
It is visible to people even with bad eyesight
None of the above
Correct Answer
Wrong Answer
45. The Sky appears blue due to
Blue colour is scattered most
The red colour is scattered most
Blue light is minimum absorbed by atmosphere
Red light is ultimately absorbed by atmosphere
Correct Answer
Wrong Answer
46. Sky is blue because
Blue colour in the Sunlight is more than other colours
Short waves are scattered more than long waves by atmosphere
Blue colour is more absorbing to eyes
Atmosphere absorbs long wavelength more than short wavelength
Correct Answer
Wrong Answer
47. Red light signal is used as a danger signal because
Red light is scattered least
This is comfortable for eyes
It produces least chemical reaction
It is least absorbed in air
Correct Answer
Wrong Answer
48. Blue colour of the sky is due to
Scattering of light
Dispersion of light
Interference of light
Emission of more blue light as compared to other colours by the Sun
Correct Answer
Wrong Answer
49. The Sun appears red during Sunset
Reflection of light
Scattering of light
Refraction of light
Diffraction of light
Correct Answer
Wrong Answer
50. The red colour of the Sun at Sunset and Sunrise is due to
Scattering of light
Refraction of light
Total internal reflection of light
Dispersion of light
Correct Answer
Wrong Answer
51. An astronaut sees the colour of the sky as
Blue
White
Black
Red
Correct Answer
Wrong Answer
52. When we see the sky from a plane in high altitude, then it seems
Blue
Black
White
Red
Correct Answer
Wrong Answer
53. Sea seems blue due to
Excess deepness
Reflection of sky and scattering of light by the drops of water
Blue colour of water
Upper layer of water
Correct Answer
Wrong Answer
54. The concept of expanding universe is based on
Doppler effect
Stark effect
Zeeman effect
Raman effect
Correct Answer
Wrong Answer
55. Suppose a rocketship is proceeding from the Earth at a speed of 2/10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth?
Blue
Orange
Yellow
Yellow-Orange
Correct Answer
Wrong Answer
56. In driving a car which type of mirror would you like to use for observing traffic at your back?
Concave mirror
Spherical mirror
Convex mirror
Plain mirror
Correct Answer
Wrong Answer
57. For shaving, one uses
Concave mirror
Plain mirror
Convex mirror
None of the above
Correct Answer
Wrong Answer
58. In order to avoid Sunlight, which of the following colour combination for an umbrella is most appropriate?
Top black and bottom white
Top white and bottom black
Only black
Only white
Correct Answer
Wrong Answer
59. The image formed by astronomical telescope is
Virtual and diminished
Virtual and magnified
Real and diminished
Real and magnified
Correct Answer
Wrong Answer
60. Light is made of seven colours. What is the method of separating the colours?
The colours can be separated by a prism
The colours can be separated by a filter
The colours can be separated by plants
The colours cannot be separated
Correct Answer
Wrong Answer
61. Which one of the following colours is seen in the middle of a Rainbow?
Blue
Green
Red
Yellow
Correct Answer
Wrong Answer
62. The terminal colour bands of the rainbow are
Blue and Orange
Green and Red
Yellow and Green
Violet and Red
Correct Answer
Wrong Answer
63. In which direction the rainbow is seen at 12 noon?
In the West
In the South
In the East
It cannot be seen
Correct Answer
Wrong Answer
64. An air bubble in water will act like a
Convex mirror
Convex lens
Concave mirror
Concave lens
Correct Answer
Wrong Answer
65. An air bubble inside water behaves as a
Bifocal lens
Convergent lens
Divergent lens
Cylindrical lens
Correct Answer
Wrong Answer
66. The minimum height of a plane mirror to see the full size image of a person is equal to
The height of the person
Half the height of the person
One-fourth the height of the person
Double the height of the person
Correct Answer
Wrong Answer
67. The radius of curvatute of the plane mirror is
Zero
One
Infinity
Between one and infinity
Correct Answer
Wrong Answer
68. The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be
0.75 metre
1.00 metre
1.50 metre
3.00 metre
Correct Answer
Wrong Answer
69. To remove the defect of long sightedness one uses
Concave lens
Convex mirror
Convex lens
Concave mirror
Correct Answer
Wrong Answer
70. Which of the following lens is used to minimize Myopia?
Convex lens
Concave lens
Cylindrical lens
None of the above
Correct Answer
Wrong Answer
71. Reading glasses are made from which type of lenses?
Concave
Convex
Plain
None of these
Correct Answer
Wrong Answer
72. The focusing in the eye is done by
Change in the convexity of the lens
To and fro movement of the lens
To and fro movement of the retina
Change in the refractive index of the eye fluid
Correct Answer
Wrong Answer
73. The mirror, which is used in searchlights, is
Concave mirror
Convex mirror
Simple mirror
None of the above
Correct Answer
Wrong Answer
74. The least distance (in cm) of distinct vision in
25
5
75
100
Correct Answer
Wrong Answer
75. For normal eyes what is the minimum distance for clear vision?
10 cm
15 cm
20 cm
25 cm
Correct Answer
Wrong Answer
76. When beams of red, blue and green lights fall on the same spot, the colour of the light becomes
Violet
Red
Yellow
White
Correct Answer
Wrong Answer
77. The change of focal length of an eye lense is caused by action of the
Pupil
Retina
Ciliary muscles
Iris
Correct Answer
Wrong Answer
78. If the lens power of glass is +2 dioptre, its focal length will be
200 cm
100 cm
50 cm
2 cm
Correct Answer
Wrong Answer
79. Power of Sunglass is
0 dioptre
1 dioptre
2 dioptre
4 dioptre
Correct Answer
Wrong Answer
80. The power of a lens is measured in
Dioptre
Aeon
Lumen
Candela
Correct Answer
Wrong Answer
81. Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?
f-22, 1/60
f-16, 1/125
f-8, 1/250
f-5.6, 1/1000
Correct Answer
Wrong Answer
82. Retina of the eye is comparable to which of the following parts of a traditional camera?
Film
Lens
Shutter
Cover
Correct Answer
Wrong Answer
83. In human eye, image of object forms at
Cornea
Iris
Pupil
Retina
Correct Answer
Wrong Answer
84. The colour of an opaque object is due to the colour it
Absorbs
Refracts
Reflects
Scatters
Correct Answer
Wrong Answer
85. Colour in a colour television is produced by a combination of three basic colours, they are
Red, blue and orange
Red, green and blue
Red, yellow and green
Red, green and brown
Correct Answer
Wrong Answer
86. The minimum distance of clear vision for a normal healthy eye of human being is supposed to be
50 cm
10 cm
15 cm
25 cm
Correct Answer
Wrong Answer
87. Which is not a primary colour?
Black
Yellow
Red
Blue
Correct Answer
Wrong Answer
88. Three colours are the primary colours. These are
Blue, Yellow and Red
Blue, Green and Red
Yellow, Green and Red
Blue, Yellow and Red
Correct Answer
Wrong Answer
89. The number of colours contained in: the Sunlight is
3
5
6
7
Correct Answer
Wrong Answer
90. Find out the odd colour from the following options.
Green
Brown
Red
Yellow
