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JEE • PHYSICS • LAWS OF MOTION

Laws of motion practice · Mixed difficulty

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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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Showing 421-426 of 426 questions

421 Medium

421 of 426

Application +4 | -1

Two skaters

A

and

B

of masses

50 \mathrm{~kg}

and

70 \mathrm{~kg}

respectively stand facing each other

6 \mathrm{~m}

apart. Then they pull on a rope stretched between them. How far has each moved when they meet?

View answer and explanation

Correct option: C

A

moves

3.5 \mathrm{~m}

and

B \,2.5 \mathrm{~m}

Option C (

A

moves

3.5 \mathrm{~m}

and

B \,2.5 \mathrm{~m}

) is correct because they meet at their center of mass.

422 Medium

422 of 426

Understanding +4 | -1

A person is measuring his weight by standing on a weighing machine inside a lift. When the lift is at rest, the machine shows his weight to be 55 kg. In between the floor when the lift is moving up with a constant speed of 10 km/hr, he again measures his weight, which is

View answer and explanation

Correct option: A

55 kg

Option A (55 kg) is correct because the weight measured by the weighing machine is the same as the actual weight when the lift moves with constant velocity.

423 Medium

423 of 426

Application +4 | -1

A body of mass 0.05 kg is observed to fall with an acceleration of 9.5

m{s^{ - 2}}

. The opposing force of
air on the body is

\left( {9.8\,\,m{s^{ - 2}}} \right)

View answer and explanation

Correct option: A

0.015\mathrm{ }N

Option A (

0.015\mathrm{ }N

) is correct because it is calculated by subtracting the observed force from the expected gravitational force.

424 Medium

424 of 426

Understanding +4 | -1

Statement I: Newton's second law is applicable on a body with respect to an inertial frame of reference.
Statement II: In order to apply Newton's second law on a body observed from a non-inertial frame of reference. We apply line pseudo force an imaginary force.

View answer and explanation

Correct option: A

Statement I is true, Statement II is true, Statement II is the correct explanation for Statement I

Option A (Statement I is true, Statement II is true, Statement II is the correct explanation for Statement I) is correct because Newton's second law is valid in inertial frames, and pseudo forces are used in non-inertial frames to apply it.

425 Medium

425 of 426

Application +4 | -1

A force of

0.03 {~N}

acts on a body of mass

0.5 {~kg}

. which is initially at rest for a duration of 10 seconds. Then find the momentum acquired by the body.

View answer and explanation

Correct option: B

0.3 {~kg} \cdot {m} \cdot {s}^{-1}

Option B (

0.3 {~kg} \cdot {m} \cdot {s}^{-1}

) is correct because it is calculated using the impulse-momentum theorem.

426 Medium

426 of 426

Understanding +4 | -1

In the above Question, if the string C is stretched slowly, then

View answer and explanation

Correct option: A

The portion AB of the string will break

Option A (The portion AB of the string will break) is correct because the tension in AB is greater due to the weight mg, causing it to reach the breaking point earlier.

Revision notes and key takeaways

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

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