NEET Physics: Questions 357 - 361 of 2098

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Question number: 357

» Kinematics » Uniform and Non-Uniform Motion

Assertion-Reason▾

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.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 358

» Laws of Motion » Force and Inertia

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.

85R

b.

23R

c.

32R

d.

58R

Question number: 359

» Kinematics » Uniformly Accelerated Motion

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.

78 N, 624 N

b.

624 N, 78 N

c.

624 N, 7800 N

d.

7800 N, 624 N

Question number: 360

» Rotational Motion » Angular Momentum

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.

πMR25T

b.

4πMR25T

c.

πMR2T

d.

πMR3T

Question number: 361

» Rotational Motion » Angular Momentum

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 and L

b.

a

c.

L Only

d.

All of the above

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