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JEE • PHYSICS • LAWS OF MOTION

Laws of motion practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Hard

1 of 6

Application +4 | -1

A body of mass

0.4 \mathrm{~kg}

starting at origin at

t=0

with a speed of

10 \mathrm{~m} / \mathrm{s}

in the positive

x

-axis direction is subjected to a constant force

F=8 N

towards negative

x

-axis. Calculate the position of the particle after 25 seconds

View answer and explanation

Correct option: A

-6000 \mathrm{~m}

Option A (-6000 m) is correct because the position is calculated using kinematic equations with constant acceleration, considering the initial velocity and the constant force.

2 Hard

2 of 6

Application +4 | -1

Two guns A and B can fire bullets at speeds 1 km/s and 2 km/s, respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by the bullets on the ground fired by the two guns is

View answer and explanation

Correct option: B

0.052777778

Option B (01:16) is correct because the ratio of areas is proportional to the fourth power of the ratio of their velocities.

3 Hard

3 of 6

Application +4 | -1

The velocity of a body of mass

20\,kg

decreases from

20\,m/s

5\,m/s

in a distance of

100\,\,\,m

Force on the body is

View answer and explanation

Correct option: C

- 37.5\,N

Option C (-37.5 N) is correct because it is the force calculated using the work-energy theorem or kinematic equations to find the acceleration and then applying Newton's second law.

4 Hard

4 of 6

Application +4 | -1

View answer and explanation

Correct option: B

01:16

Option B (01:16) is correct because the ratio of areas is proportional to the fourth power of the ratio of their velocities.

5 Hard

5 of 6

Understanding +4 | -1

A metre scale is moving with uniform velocity. This implies

View answer and explanation

Correct option: B

the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero

Option B is correct because uniform velocity implies zero net force and zero net torque acting on the meter scale.

6 Hard

6 of 6

Analyzing +4 | -1

A body of mass M is kept on a rough horizontal surface (friction coefficient

\mu

). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is F, where

View answer and explanation

Correct option: C

Mg \le F \le Mg\sqrt {1 + {\mu ^2}}

Option C (

Mg \le F \le Mg\sqrt {1 + {\mu ^2}}

) is correct because the force by the surface ranges from the weight to the maximum force including friction.

Revision notes and key takeaways

Review LAWS OF MOTION in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 6 single-correct-answer MCQs on LAWS OF MOTION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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