1. Diffusion of light in the atmosphere takes place due to ( UPPSC PYQ 2021)
a) Carbon dioxide
b) Dust particles
c) Helium
d) Water vapors
Answer. b) Dust particles;
.
2. Which of the following types of glass can cut off ultraviolet rays? ( UPPSC PYQ 2021)
a) Soda glass
b) Pyrex glass
c) Jena glass
d) Crookes glass
Answer. d) Crookes glass can be cut off ultraviolet rays.
.
3. Sunglasses are made up of glass?
a) Soda glass
b) Pyrex glass
c) Jena glass
d) Crookes glass
Answer. d) Crookes glass;
.
4. Mirage formations are an example of- ( UPPSC PYQ)
a) Refraction
b) Diffraction
c) Total internal reflection
d) Dispersion
Answer. c) Total internal reflection;
.
5. A Black body does NOT ( UPPSC PYQ)
a) Emit radiation
b) Absorb radiation
c) Refract radiation
d) None of the above
Answer. a) Emit radiation
6. A soap bubble seen under white light shows color. The phenomenon responsible for this is as follows? ( UPPSC PYQ)
a) Scattering
b) Interference
c) Dispersion
d) Diffraction
Answer. b) Interference;
.
7. In a Sitar, which type of sound vibrations are produced?
a) Progressive and Longitudinal
b) Progressive and Transverse
c) Stationery and Longitudinal
d) Stationery and Transverse
Answer. d) Stationery and Transverse;
8. Optical Fibre works on the principle of
a) Total internal reflections
b) Refraction
c) Scattering
d) Interference
Answer. a) Total internal reflections;
.
9. Which one of the following phenomena is used in optical fibers?
a) Interference
b) Refraction
c) Total internal reflection
d) Polarisation
Answer. c) Total internal reflection
10. Consider the following statements-
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fiber communication system, power consumption is extremely low.
3. Optical fiber communications are free from radio frequency interference.
4. In India, Reliance Group of Industries engages in the manufacture of optical fiber.
Which of the statements is correct-
a) 1,2, and 3
b) 1,2 and 4
c) 1,3, and 4
d) 2,3, and 4
Answer. a) 1,2, and 3
11. The reason of Mirage is
a) Interference of light
b) Diffraction of light
c) Polarization of light
d) Total internal reflection of light
Answer. d) Total internal reflection of light;
.
12. A shredded diamond shines with twinkling-
a) Due to total internal reflection
b) Due to light absorption
c) Due to some natural qualities
d) Due to its molecular structure
Answer. a) Due to total internal reflection;
.
13. Which of the following is used to take 3-dimensional pictures.
a) Photography
b) Holography
c) Radiography
d) None of the above
Answer. b) Holography;
.
14. Television signals can't be received beyond a certain distance because-
a) Signals are weak
b) Antenna is weak
c) Air absorbs signals
d) The surface of the earth is curved
Answer. d) The surface of the earth is curved;
15. The technique used to transmit audio signals in television broadcasts is -
a) Amplitude Modulation
b) Frequency Modulation
c) Pulse code modulation
d) Time division Multiplexing
Answer. b) Frequency Modulation;
.
15. The image formed on the Retina is -
a) Equal to object but inverted
b) Smaller than an object but straight
c) Smaller than an object but inverted
d) Equal to object but straight
Answer. c) Smaller than an object but inverted;
.
16. The blue color of the ocean is due to -
a) Scattering of light
b) Dispersion of light
c) Light interference
d) The sun emits more light than other colors.
Answer. a) Scattering of light due to scattering of light from water particles.
The blue color of the ocean is primarily due to a phenomenon called Rayleigh scattering.
17. Bats can fly during dark nights and also prey. This is because
a) The pupil of their eyes is large
b) Their night vision is very good
c) Every bird can do this
d) They produce ultrasonic waves and are guided by them
Answer. d) They produce ultrasonic waves and are guided by them;
.
18. A decibel unit is used to measure the
a) In measuring the intense of light
b) To measure the intensity of sound
c) To measure the magnitude of the earthquake
d) None of the above
Answer. b) To measure the intensity of sound;
.
19. As per the WHO, the safe noise level for a city is
a) 45 db
b) 50 db
c) 55 db
d) 60 db
Answer. c) 55 db;
.
20. Sound above what level is considered hazardous noise pollution?
a) 30 db
b) 100 db
c) 80 db
d) 120 db
Answer. c) 80 db;
.
21. What type of legitimate magnetic radiation is used under the remote control of a television receiver?
a) Visible
b) Ultraviolet
c) Infrared
d) None of the above
Answer. c) Infrared;
.
22. Which of the following radiation types has the most energy?
a) Invisible rays
b) X-ray
c) Ultraviolet
d) Infrared
Answer. b) X-ray
23. Which of the following electrical radiations has maximum energy?
a) Visible light
b) Infrared rays
c) Ultraviolet
d) X-Rays
Answer. d) X-Rays;
24. A laser is a device for producing
a) Spontaneous radiation
b) Dispersed radiation
c) Scattered Radiation
d) Stimulated radiation
Answer. d) Stimulated radiation;
.
25. Bacteria can be seen by
a) Naked eye
b) Compound microscope
c) Hand lens
d) Electron microscope
Answer. b) Compound microscope;
.
26. The speed of light will be minimal while passing through
a) Water
b) Vacuum
c) Air
d) Glass
Answer. d) Glass
27. Consider the following statements
Assertion A During sleep, bright light is undesirable
Reason R: In bright light, the production of melatonin in the body is considerably increased
Select your answer using the codes given below:
a) (A) and (R) are both correct, and (R) is the correct explanation of (A)
a) (A) and (R) are both correct, and (R) is not the correct explanation of (A)
c) (A) is true, but (R) is false
d) (A) is false, but (R) is true
Answer. c) (A) is true, but (R) is false
28. Which light is most effective in photosynthesis?
a) Red
b) Blue
c) Green
d) Violet
Answer. a) Red;
.
29. The sky appears blue due to
a) Diffraction of light
b) Reflection of light
c) Refraction of light
d) Scattering of light
Answer. d) Scattering of light;
.
30. The sun appears red during sunset
a) Reflection of light
b) Scattering of light
c) Refraction of light
d) Diffraction of light
Answer. b) Scattering of light;
The sun appears red during sunset (and sunrise) primarily due to a phenomenon known as atmospheric scattering.
31. The red color of the sun at sunset and sunrise is due to
a) Scattering of light
b) Refraction of light
c) Total internal reflection of light
d) Dispersion of light
Answer. a) Scattering of light
32. An Astronaut sees the color of the sky as
a) Blue
b) White
c) Black
d) Red
Answer. c) Black;
An astronaut in space, beyond Earth's atmosphere, would not see a blue sky like we do on Earth. Instead, the sky would appear completely black. This is because there is no atmosphere in space to scatter sunlight and create the blue appearance we see on our planet.
33. When we see the sky from a plane at high altitude, then it seems-
a) Blue
b) Black
c) White
d) Red
Answer. b) Black
34. The ( Green) Grass appears green to us because
a) It reflects green color light to our eyes
b) It absorbs green color light
c) It reflects all other color lights except that of green color
d) None of the above
Answer. a) It reflects green color light to our eyes;
.
35. The concept of an expanding universe is based on -
a) Doppler effect
b) Stark effect
c) Zeeman effect
d) Raman effect
Answer. a) Doppler effect;
.
36. In driving a car which type of mirror would you like to use for observing traffic at your back?
a) Concave mirror
b) Spherical Mirror
c) Convex mirror
d) Plain Mirror
Answer. c) Convex mirror;
.
38. Which of the following types of mirrors are used to view the traffic behind a car?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror
Answer. a) Convex mirror;
.
39. Which mirror is used as a rearview mirror in vehicles?
a) Plain
b) Convex
c) Concave
d) Cylindrical
Answer. b) Convex
40. In order to avoid sunlight, which of the following color combinations for an Umbrella is most appropriate?
a) Top black and bottom white
b) Top white and bottom black
c) Only black
d) Only white
Answer. b) Top white and bottom black
41. The image formed by the astronomical telescope is
a) Virtual and diminished
b) Virtual and magnified
c) Real and diminished
d) Real and magnified
Answer. b) Virtual, inverted, and magnified;
.
42. The number of images of an object placed between two parallel is -
a) Two
b) One
c) Six
d) Infinite
Answer. d) Infinite;
.
43. How many images will be formed if a point light source is placed between parallel plane mirrors?
a) Two
b) four
c) Eight
d) Infinite
Answer. d) Infinite
44. Which one of the following colors is seen in the middle of the rainbow?
a) Blue
b) Green
c) Red
d) Yellow
Answer. b) Green;
.
45. An air bubble in water will act like a
a) Convex mirror
b) Convex lens
c) Concave mirror
d) Concave lens
Answer. d) Concave lens;
Convex Mirror:
.
46. An air bubble inside water behaves as
a) Bifocal lens
b) Convergent Lens
c) Divergent lens
d) Cylindrical lens
Answer. c) Divergent lens;
.
47. The height of a plane mirror to see the full-size image of a person is equal to
a) The height of the person
b) Half of the height of the person
c) One-fourth the height of the person
d) Double the height of the person
Answer. b) Half of the height of the person;
.
48. The minimum height of the mirror required to see the whole stand-up image of a man of height 1.50 meters shall be
a) 0.75 metre
b) 1.00 metre
c) 1.50 metre
d) 3.00 metre
Answer. a) 0.75 metre
49. Which one of the following statements is not true for a person suffering from hypermetropia?
a) The person can see objects distinctly
b) The focal length of the lens is large
c) The image of the close objects focussed behind the retina
d) A concave lens is used to correct this defect.
Answer. d) A concave lens is used to correct this defect.
.
50. Which of the following lenses is used to correct myopia?
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) None of these
Answer. b) Concave lens;
51. A myopic eye can be corrected by using a
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) Plane convex lens
Answer. b) Concave lens;
52. For the myopic eye, the defect is cured by
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) None of the above
Answer. b) Concave lens
53. The focusing in the eye is done by -
a) Change in the convexity of the lens
b) To and from the movement of the lens
c) To and from the movement of the retina
d) Change in the refractive index of the eye fluid
Answer. a) Change in the convexity of the lens
54. Which one of the following statements is not correct?
a) Mirage is an optical illusion arising due to the total internal reflection of light
b) Concave mirrors are used in searchlights.
c) In summer, white or light-colored clothes are preferred to dark-colored clothes generally
d) A convex mirror with a small aperture is used by doctors to examine the ears, nose, or throat of patients.
Answer. d) A convex mirror with a small aperture is used by doctors to examine the ears, nose, or throat of patients.
55. In Mirror, which is used in searchlights is-
a) Concave mirror
b) Convex mirror
c) Simple mirror
d) None of these
Answer. a) Concave mirror
56. The least distance of distinct vision is ( cm)
a) 25
b) 5
c) 75
d) 100
Answer. a) 25;
.
57. The minimum distance of clear vision for a normal healthy eye of the human being is supposed to be
a) 50 cm
b) 10 cm
c) 15 cm
d) 25 cm
Answer. d) 25 cm
58. Power of the Sunglass is
a) 0 dioptre
b) 1 dioptre
c) 2 dioptre
d) 4 dioptre
Answer. a) 0 dioptre;
Sunglasses are eyewear designed to protect the eyes from bright sunlight and harmful ultraviolet (UV) radiation. They serve both functional and aesthetic purposes
59. Retina of the eye is comparable to which of the following parts of a traditional Camera?
a) Film
b) Lens
c) Shutter
d) Cover
Answer. a) Film;
.
60. The number of colors contained in the sunlight is
a) 3
b) 5
c) 6
d) 7
Answer. d) 7
61. Long radio waves are reflected by which of the following layers of Earth's surface-
a) Troposphere
b) Ionosphere
c) Troposphere
d) Stratosphere
Answer. b) Ionosphere;
.
62. Wireless communication is reflected back to the earth's surface by the
a) Troposphere
b) Stratosphere
c) Ionosphere
d) Exosphere
Answer. c) Ionosphere
63. Which one of the following statements is not true about cosmic rays?
a) They are electromagnetic waves
b) They have a very short wavelength
c) They are made of highly energetic charged particles
d) They originate from the sun
Answer. a) They are electromagnetic waves;
.
64. Waves used for telecommunication are
a) Visible light
b) Infrared
c) Ultraviolet
d) Microwave
Answer. d) Microwave;
.
65. A CT Scan is done by using
a) Infrared Rays
b) Ultrasonic Waves
c) Visible light
d) X-Rays
Answer. d) X-Rays;
66. The sound will have the highest velocity in
a) Vacuum
b) Air
c) Water
d) Steel
Answer. d) Steel
67. Sound waves-
a) Can travel in a vacuum
b) Can travel only in solid
c) Can travel only in gases
d) Can travel both in solid and gaseous medium
Answer. d) Can travel both in solid and gaseous medium;
.
68. In which of the following options, can sound not travel?
a) Water
b) Vacuum
c) Iron
d) Air
Answer. b) Vacuum
a) Amplify sound
b) Transmit sound
c) Reflect Sound
d) Absorb sound
Answer. d) Absorb sound;
.
70. To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
a) 165 feet
b) 165 meter
c) 16.5 feet
d) 16.5 meter
Answer. d) 16.5 meter
71. An astronaut cannot hear his companion at the surface of the moon because
a) Produced frequencies are above the audio
b) Temperature is too low during the night and too high during the day
c) There is so medium for sound propagation
d) There are many craters on the surface of the moon
Answer. c) There is so medium for sound propagation;
Astronauts on the surface of the Moon cannot hear their companions or any other sounds in the traditional sense due to the lack of a medium for sound to travel through.
72. Consider the following statements about ultrasonic waves-
1. They can destroy insects
2. They can clean clothes by removing dust
3. They can be used to treat diseases
4. They can control automatic doors.
Of the above statements-
a) 1 and 2 are correct
b) 3 and 4 are correct
c) 1,2, and 3 are correct
d) All are correct
Answer. d) All are correct;
.
73. Ultrasonics are sound waves of frequency-
a) Greater than 20000 Hz
b) Less than 10000 Hz
c) Equal to 1000 Hz
d) None of these
Answer. a) Greater than 20000 Hz;
74. In SONAR, we use ( UPPSC PYQ)
a) Radio waves
b) Audio Sound Waves
c) Ultrasonic Waves
d) Infrasonic Waves
Answer. c) Ultrasonic Waves;
75. The wavelength extension of visible light is
a) Between 200-900 nm
b) Between 250-850 nm
c) Between 300-800 nm
d) Between 390-780 nm
Answer. d) Between 390-780 nm
76. The human eye is most sensitive to visible light of the wavelength.
a) 6050 A'
b) 5500 A'
c) 4500 A'
d) 7500 A'
Answer. b) 5500 A'
77. Light appears to travel in a straight line because-
a) It consists of small particles
b) The velocity of light is very large
c) The wavelength of light is very small
d) Light is reflected by the surroundings
Answer. c) The wavelength of light is very small
78. Which of the following has the highest velocity?
a) Cosmic rays
b) Light
c) Electron
d) Supersonic wave
Answer. b) Light;
.
79. Velocity of light is maximum is
a) Diamond
b) Water
c) Vacuum
d) Hydrogen
Answer. c) Vacuum
80. Light from the sun reaches Earth in about
a) 2 minutes
b) 4 minutes
c) 8 minutes
d) 16 minutes
Answer. c) 8 minutes;
.
81. When light passes from one medium to another medium, which one of the following does not change-
a) Intensity
b) Velocity
c) Wavelength
d) Frequency
Answer. d) Frequency
82. Which one of the following energy conversions takes place in carrying out photosynthesis?
a) Light to chemical energy
b) Light to thermal energy
c) Thermal to biochemical energy
d) Heat to kinetic energy
Answer. a) Light to chemical energy
83. Direct viewing of the sun during a total solar eclipse causes irreversible damage to the eyes. The retinal burn is caused by one of the following components of the sun rays?
a) Heat
b) Rainbow light
c) Ultraviolet light
d) Infrared light
Answer. c) Ultraviolet light
84. The color of the star is an indication of its-
a) Distance from the earth
b) Temperature
c) Luminosity
d) Distance from the sun
Answer. b) Temperature;
.
85. The color of light is determined by its
a) Amplitude
b) Wavelength
c) Intensity
d) Velocity
Answer. b) Wavelength
86. The light with the shortest wavelength is
a) Red
b) Yellow
c) Blue
d) Violet
Answer. d) Violet;
.
87. The sun and the moon appear elliptical near the horizon because of
a) Refraction
b) Optical Illusion
c) Interference Phenomenon
d) Their actual shape
Answer. a) Refraction;
.
88. Red light is used in traffic signals because-
a) It has the longest wavelength ( length)
b) It is beautiful
c) It is also visible to poorly lit people.
d) None of the above reasons
Answer. a) It has the longest wavelength ( length)
.
89. Assertion A- The danger signal is made up of red color.
Reason R- The red color is scattered the least.
Select the correct answer using the codes given below:
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer. a) Both A and R are true and R is the correct explanation of A.
90. A red light signal is used as a danger signal because-
a) It is scattered least
b) This is comfortable for the eyes
c) It produces the least chemical reaction
d) It is least absorbed in air
Answer. a) It is scattered least
91. The blue color of the sky is due to - ( UPPSC PYQ 2021)
a) Scattering of light
b) Dispersion of light
c) Light interference
d) The sun emits more light than other colors.
Answer. a) Scattering of light due to dust particle
92.
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