NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 937 - 939 of 2320

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Question number: 937

» Work, Energy and Power » Elastic and Inelastic Collisions

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MCQ▾

Question

In an inelastic collision-

Choices

Choice (4)Response

a.

Momentum is conserved but kinetic energy is not conserved

b.

neither momentum nor kinetic energy is conserved

c.

momentum is not conserved but kinetic energy is conserved

d.

the momentum and kinetic energy are conserved

Question number: 938

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –

Choices

Choice (4)Response

a.

,

b.

,

c.

,

d.

,

Question number: 939

» Work, Energy and Power » Elastic and Inelastic Collisions

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Assertion-Reason▾

Question

Assertion (Ꭺ)

In an elastic collision in one dimension between two bodies, total momentum remains the same before, during and after the collision.

Reason (Ꭱ)

In an elastic collision in one dimension between two bodies, total kinetic energy remains the same before, during and after the collision. [Assume external forces are absent in both the above statements],

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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