|Physics MCQ Questions with Answer|
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 vapor 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?
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
(d) All of them, will reach the room temperature at the same time
Q98. Which electromagnetic radiation is used for satellite communication?
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