Physics MCQ Questions with Answer | ||||
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Q76. A ‘black hole’ is a body in space that does not allow any radiation to come out. This property is due to its:
(a) Very small size
(b) Very large size
(c) Very high density
(d) Very low size
Q77. When a ray of light enters a glass slab, then
(a) Only the frequency changes
(b) Frequency and velocity change
(c) Frequency does not change
(d) Frequency and wavelength change
Q78. Match List I with List-II and select the correct answer using the code given below the Lists:
| List-I (Physical quantity) | List-II (Unit) |
| A. Distance | 1. Mole |
| B. Amount of material | 2. Coulomb |
| C. Amount of electrical charge | 3. Light year |
| D. energy | 4. Watt-hour |
Code: A B C D
(a) 3 1 2 4
(b) 3 2 1 4
(c) 4 2 1 3
(d) 4 1 2 3
Q79. The ozone layer above the surface of Earth provides a shield against
(a) X-rays
(b) Ultra Violet Rays
(c) Gamma Rays
(d) Infrared Rays
Q80. Which of the following is not a part of a CRT?
(a) Phosphor Screen
(b) Shadow Mask
(c) Electron Gun
(d) Gas Plasma
Q81.
The displacement (x)-time (t) graph given above approximately represents the motion of a
(a) Simple pendulum placed in a vacuum
(b) Simple pendulum immersed in water
(c) Simple pendulum placed in outer space
(d) Point mass moving in the air
Q82. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then
(a) remains horizontal.
(b) is inclined to the horizontal with smaller depth at the rear end.
(c) is inclined to the horizontal with a larger depth at the rear end.
(d) Assumes parabolic curves.
Q83. Consider the following statements:
1. Light of a longer wavelength is scattered much more than the light of a shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in a vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding of vehicles, police use the Doppler Effect to reflected short radio waves.
Which of these statements are correct?
(a) 1 and 2
(b) 1 and 3
(c) 2 and 4
(d) 3 and 4
Q84. Light travels fastest in
(a) Nitrogen
(b) Air
(c) Steel
(d) Vacuum
Q85. The spokes used in the wheel of a bicycle increase its
(a) Moment of inertia
(b) Velocity
(c) Acceleration
(d) Momentum
Q86. Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece.
Reason (R): The density of copper is more than that orgies
Codes:
(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 a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Q87. Consider the following statements:
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statement(s) given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Q88. The function of ball bearings in a wheel is:
(a) To increase friction
(b) To convert kinetic friction into rolling friction
(c) To convert static friction into kinetic friction
(d) Just for convenience
Q89. Action and reaction _____.
(a) Always act on the same body
(b) Are equal in magnitude
(c) Are in the same direction
(d) Always act independently
Q90. Which mirror is used as a rearview mirror in the vehicles?
(a) Plane
(b) Convex
(c) Concave
(d) Inverted
Q91. The Law of Inertia is also known as _____.
(a) Newton’s first law of motion
(b) Newton’s second law of motion
(c) Newton’s third law of motion
(d) None of these
Q92. What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
(a) The liquid cools
(b) The liquid boils
(c) No change
(d) The liquid evaporates
Q93. Assertion (A): The boiling point of water decreases as the altitude increases.
Reason (R): The atmospheric pressure increases with altitude.
Codes: (a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but it is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Q94. Ultrasonics is sound waves of frequency
(a) Greater than 20,000 Hz
(b) Less than 10,000 Hz
(c) Equal to 1000 Hz
(d) None of these
Q95. Which of the following is not scalar quantity?
(a) Time
(b) Volume
(c) Density
(d) Momentum
Q96. An image formed by a concave mirror on a screen is called __________?
(a) Virtual image
(b) Real image
(c) Inverted image
(d) Erect image
Q97. A hollow sphere of radius R, a hollow cube of side 12, and a thin circular plate of radius R, made up of the fame material, are all heated to 20°C above room temperature. When left to cool in the room, which of them will reach the room temperature first?
(a) Circular plate
(b) Cube
(c) Sphere
(d) All of them, will reach room temperature at the same time
Q98. Which electromagnetic radiation is used for satellite communication?
(a) Ultraviolet
(b) Infrared
(c) Microwave
(d) Millimeter-wave
Q99. Cloudy nights are warmer compared to clear cloudless nights because clouds:
(a) Prevent clod waves from the sky from descending on earth
(b) Reflect back the heat given off by the earth
(c) Produce heat and radiate it towards the earth
(d) Absorb heat from the atmosphere and send it towards the earth
Q100. When we hear a sound, we can identify its source from
(a) Wavelength of sound
(b) The overtones present in the sound
(c) The intensity of sound
(d) The amplitude of the sound
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