Waves And Motions(General Knowledge > General Science ) Questions and answers for exam Preparation

General Knowledge > General Science

WAVES AND MOTIONS MCQs

Laws Of Motion, Second Law Motion, Uniform Circular Motion, First Law Of Motion, Third Law Motion, Horizontal Projectile Motion, Oscillations And Waves, Radio Wave Propagation, Wave Optics

Total Questions : 131 | Page 11 of 14 pages

Question 101. What is Newton's second law of motion?

For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by an unbalanced force.

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Answer: Option B. -> The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Question 102. What is the accelerating force on the Diwali rocket if it ejects 0

20 N
20 dynes
1000 N
22 dynes

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Answer: Option A. -> 20 N

Question 103. What is the velocity of a body of mass 5 gm if a force of 100 dynes acts on the body for 10 seconds?

2 cm/sec
20 cm/sec
200 cm/sec
2000 cm/sec

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Answer: Option C. -> 200 cm/sec

Question 104. Mass of the object is quantitative measure of its inertia stated law is newton's

first law
second law
third law
fourth law

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Answer: Option A. -> first law

Question 105. "Every action has an equal and opposite reaction" is newton's

first law
second law
third law
fourth law

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Answer: Option C. -> third law

Question 106. Newton’s second law of motion gives us a measure of:

force
momentum
inertia
acceleration

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Answer: Option A. -> force

Question 107. When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s)

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Answer: Option B. -> 4

Question 108. What force can change the velocity of a body of mass 1kg from 20 m/s to 30m/s in 2 seconds?

5 N
10 N
15 N
25 N

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Answer: Option A. -> 5 N

Question 109. Which of the following situations involves Newton’s second law of motion?

A force can stop a lighter vehicle as well as a heavier vehicle which are moving
A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the (vehicles coming to a standstill
A force can accelerate a lighter vehicle more easily than a heavier vehicle which is moving
A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards

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Answer: Option C. -> A force can accelerate a lighter vehicle more easily than a heavier vehicle which is moving

Question 110. He seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured