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NEET Practice Questions (MCQs) with Answers & Solutions

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A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is

A. 40 J B. 60 J C. 100J D. 140 J

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Explanation

By low of conservation of momentum $ 2 \times 10 = (2+3) v $ $ \therefore v = 4 m/s $ Loss in K.E = $ { 1 \over 2} (2) (10)^2 - { 1 \over 2} (5) (4) ^2 $

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A billiard ball moving with a speed of 8 m/s collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of..... (elastic collision)

A. 8 m/s B. 4 m/s C. 16 m/s D. 1.0 m/s

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Explanation

In elastic head on collision velocites gets interchanged.

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A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be

A. $ { 1 \over 2} mv^2 \times { M \over ( m+m ) } $ B. $ { 1 \over 2} mv^2 \times { (m+m) \over M} $ C. $ { 1 \over 2} MV^2 \times { m \over (m+M) } $ D. $ { 1 \over 2} mv^2 \times { m \over (m+M) } $

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Explanation

By conservation of momentum, mv + M(o) = (m+M) v Velocity of composite block $ V = \left ( { m \over m+M} \right) v $ K.E. of composite block = $ { 1 \over 2} (M+ m)v^2 $

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A body of mass m1 is moving with a velocity v. It collides with another stationary body of mass m1. They get embeded. At the point of collision, the velocity of the system

A. Increases B. Decreases but does not become zero C. Remains same D. Become zero

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Explanation

By conservation of momentum, $ m_1 V+ m_2 (0) = (m_1 +m_2) V$

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : A light body and heavy body have same momemtum. Then they also have same kinetic energy. Reason : Kinetic energy does not depend on mass of the body.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : Mountain roads rarely go straight up the slope. Reason : slope of mountains are large, therefore, more chances of vehicle to slip from roads.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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Explanation

The assertion is true because mountain roads rarely go straight up the slope due to safety and practical considerations. The reason is also true and is the correct explanation for the assertion. Steep slopes increase the risk of vehicles slipping due to reduced friction, which is why mountain roads are often designed with gradual inclines and curves.

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : The change in kinetic energy of a particle is equal to the work done on it by the net force. Reason : Change in kinetic energy of particle is equal to the work done only in case of a system of one particle.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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Explanation

The change in kinetic energy of a particle is indeed equal to the work done on it by the net force, according to the work-energy theorem. However, this is not limited to a system of one particle; it applies to systems with multiple particles as well. Hence, both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : Work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : A weight lifter does no work in holding the weight up. Reason : Work done is zero because distance moved is zero.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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Explanation

When a weight lifter holds a weight up without moving it, no work is done because work is defined as the product of the force and the distance moved in the direction of the force. Since the distance moved is zero, the work done is zero. Hence, both the assertion and the reason are true, and the reason correctly explains the assertion.

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(ASSERTION & REASON) Assertion and Reason are given in following questions. Each question have four option. One of them is correct it. Assertion : stopping distance = Kinetic energy / Stopping force Reason : Work done in stopping a body is equal to K.E. of the body.

A. If both assertion and reason and the reason is the correct explanation of the Assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If the assertion is true but reason is false. D. If the assertion and reason both are false.

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Explanation

The assertion states that the stopping distance is equal to the kinetic energy divided by the stopping force, which is correct. The reason provided is that work done in stopping a body is equal to its kinetic energy, which also is correct. Since work done (W) is equal to force (F) times distance (d), and it equals the initial kinetic energy (K.E.), the stopping distance (d) can be derived as K.E. divided by the stopping force (F). Hence, both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

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