NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 358 - 362 of 2184

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Question number: 358

» Kinematics » Uniform and Non-Uniform Motion

Edit
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.

Question number: 362

» Rotational Motion » Angular Momentum

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MCQ▾

Question

A uniform heavy disc is rotating at constant angular velocity about a vertical axis through its center and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticize is dropped vertically on the disc and sticks to it. Which of the following will be constant?

Choices

Choice (4) Response

a.

a

b.

a and L

c.

L Only

d.

None of the above