Laws of motion MCQs for NEET Physics Class 11

Newton’s laws of motion are the fundamental laws that are used for describing the motion of the body. There are three laws of motion and they are as follows:

  • An object continues to be in the state of uniform motion or in the state of rest unless an external force acts on it. (Also known as the law of inertia)
  • Force is a product of mass and acceleration.
  • For every action, there is an equal and opposite reaction. (Also known as conservation of momentum)

1. A particle of mass m is given an impulse such that the velocity of the particle changes from v1 to v2. The impulse is equal to

(a) m(v2 + v1)

(b) m (v2 – v1)

(c) m (|v2|-|v1|)

(d)

\(\begin{array}{l}\frac{1}{2}(v_{2}^{2}-v_{1}^{2})\end{array} \)

Answer: (b) m (v2 – v1)

2.What is the time taken by the body to slide down an inclined plane if the length of the inclined plane is L, a as the retardation, and Ө is the angle of inclination.

(a)

\(\begin{array}{l}\sqrt{\frac{2L}{g\;sin\theta }}\end{array} \)

(b)

\(\begin{array}{l}\sqrt{\frac{2L}{a\;sin\theta }}\end{array} \)

(c)

\(\begin{array}{l}\sqrt{\frac{2L}{(g+a)\;sin\theta }}\end{array} \)

(d)

\(\begin{array}{l}\sqrt{\frac{2L}{(g-a)\;sin\theta }}\end{array} \)

Answer: (c)

\(\begin{array}{l}\sqrt{\frac{2L}{(g+a)\;sin\theta }}\end{array} \)

3. Choose the correct statement

(a) A body can be accelerated by frictional force

(b) There can be zero friction

(c) Kinetic friction is greater than rolling friction

(d) Frictional force and area of contact between the two surfaces are proportional

Answer: (c) Kinetic friction is greater than rolling friction

4. Consider a car that overturns while taking a turn. Select the option that is experienced by the wheels of the car.

(a) First, both inner, as well as the outer wheel, leave the ground

(b) First, the inner wheel leaves the ground

(c) The inner wheel experiences no change

(d) None of the above

Answer: (b) First, the inner wheel leaves the ground

5. Let two bodies be with masses 2kg and 5kg respectively. Let these bodies be at rest with the same force acting on them. Calculate the ratio of times that is required by both the bodies to reach the final velocity.

(a) 2:5

(b) 25:4

(c) 5:3

(d) 4:25

Answer: (a) 2:5

6. What is the force acting on the particle if the motion of the particle is given as

\(\begin{array}{l}y=ut+\frac{1}{2}gt^{2}\end{array} \)

(a) F = ma

(b) F = 0

(c) F = mg

(d) F ≠ 0

Answer: (c) F = mg

7. Consider two bodies of masses A and B such that these two bodies are connected by using a massless spring. Also, force F is acting on the body B. What will be the acceleration of B if A has an acceleration of a?

Newton’s laws of motion are the fundamental laws that are used for describing the motion of the body. There are three laws of motion and they are as follows:

(a) a

(b) F – T

(c)

\(\begin{array}{l}(\frac{F}{m}-a)\end{array} \)

(d)

\(\begin{array}{l}(a-\frac{F}{m})\end{array} \)

Answer: (c)

\(\begin{array}{l}(\frac{F}{m}-a)\end{array} \)

8. Let A, B, and C be the three blocks of mass 2kg each. These blocks are hanging over a pulley with the help of a string. What is the tension produced by the string connecting B and C?

Newton’s laws of motion are the fundamental laws that are used for describing the motion of the body. There are three laws of motion and they are as follows:

(a) 3.3N

(b) 0

(c) 13.1N

(d) 19.6N

Answer: (c) 13.1N

9. Consider three masses of 1kg, 3kg and 6kg which are connected to each other and are placed horizontally on the table. Calculate the acceleration of this system. Consider g = 10m/s.

Newton’s laws of motion are the fundamental laws that are used for describing the motion of the body. There are three laws of motion and they are as follows:

(a) 3

(b) 0

(c) 1

(d) 2

Answer: (d) 2

10. From the following diagram, select the correct diagram when a vessel containing water is given a constant acceleration towards the right along the straight line.

Newton’s laws of motion are the fundamental laws that are used for describing the motion of the body. There are three laws of motion and they are as follows:

Answer: (c)

11. Consider a man standing on the spring balance such that the reading on the spring balance is 60kg. If the man jumps out of the spring balance what will be the final reading of the spring balance?(a) Remains unchanged

(b) Increases

(c) Decreases

(d) First increases then decrease to zero

Answer: (d) First increases then decreases to zero

12.Which of the following should be constant for a body to have a constant momentum?

(a) Acceleration

(b) Force

(c) Velocity

(d) All of the above

Answer: (d) All of the above

Er. Neeraj K.Anand is a freelance mentor and writer who specializes in Engineering & Science subjects. Neeraj Anand received a B.Tech degree in Electronics and Communication Engineering from N.I.T Warangal & M.Tech Post Graduation from IETE, New Delhi. He has over 30 years of teaching experience and serves as the Head of Department of ANAND CLASSES. He concentrated all his energy and experiences in academics and subsequently grew up as one of the best mentors in the country for students aspiring for success in competitive examinations. In parallel, he started a Technical Publication "ANAND TECHNICAL PUBLISHERS" in 2002 and Educational Newspaper "NATIONAL EDUCATION NEWS" in 2014 at Jalandhar. Now he is a Director of leading publication "ANAND TECHNICAL PUBLISHERS", "ANAND CLASSES" and "NATIONAL EDUCATION NEWS". He has published more than hundred books in the field of Physics, Mathematics, Computers and Information Technology. Besides this he has written many books to help students prepare for IIT-JEE and AIPMT entrance exams. He is an executive member of the IEEE (Institute of Electrical & Electronics Engineers. USA) and honorary member of many Indian scientific societies such as Institution of Electronics & Telecommunication Engineers, Aeronautical Society of India, Bioinformatics Institute of India, Institution of Engineers. He has got award from American Biographical Institute Board of International Research in the year 2005.