NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 357 - 361 of 2320

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Question number: 357

» Kinematics » Uniform and Non-Uniform Motion

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MCQ▾

Question

A block of metal weighing 5 kg is resting on a frictionless plane. It is stack by a jet releasing water at a rate of 1 kg/s and at a speed of 10 m/s. The initial acceleration of the block will be –

Choices

Choice (4)Response

a.

0

b.

2 m/s 2

c.

5 m/s 2

d.

2.5 m/s 2

Question number: 358

» Kinematics » Uniform and Non-Uniform Motion

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Assertion-Reason▾

Question

Assertion (Ꭺ)

If the net external force on the body is zero then its acceleration is zero.

Reason (Ꭱ)

Acceleration does not depend on force.

Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

Question number: 359

» Laws of Motion » Force and Inertia

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MCQ▾

Question

A particle of mass m slides down from the vertex of semi-hemisphere, without any initial velocity. At what height from horizontal will the particle leave the sphere-

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 360

» Kinematics » Uniformly Accelerated Motion

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MCQ▾

Question

The total mass of an elevator with a 80 kg man in it is 1000 kg. This elevator moving upward with a speed of 8 m/sec, is brought to rest over a distance of 16m. The tension T in the cables supporting the elevator and the force exerted on the man by the elevator floor will respectively be

Choices

Choice (4)Response

a.

624 N, 78 N

b.

624 N, 7800 N

c.

78 N, 624 N

d.

7800 N, 624 N

Question number: 361

» Rotational Motion » Angular Momentum

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MCQ▾

Question

If the earth is treated as a sphere of radius R and mass M. Its angular momentum about the axis of rotation with period T is

Choices

Choice (4)Response

a.

b.

c.

d.

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