NEET Physics: Questions 936 - 938 of 2098

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Question number: 936

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

Question

In an inelastic collision-

Choices

Choice (4) Response

a.

the momentum and kinetic energy are conserved

b.

neither momentum nor kinetic energy is conserved

c.

momentum is not conserved but kinetic energy is conserved

d.

Momentum is conserved but kinetic energy is not conserved

Question number: 937

» Kinematics » Average Speed and Instantaneous Velocity

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.

tan1(e(tanθ)) , 1ve2sin2θ+cos2θ

b.

tan1(etanθ) , vsin2θ+e2

c.

tan1(etanθ) , vetanθ

d.

tan1(tanθe) , vsin2θ+e2cos2θ

Question number: 938

» Work, Energy and Power » Elastic and Inelastic Collisions

Assertion-Reason▾

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 and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

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