NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 397 - 400 of 2184

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Question number: 397

» Laws of Motion » Force and Inertia

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MCQ▾

Question

In the arrangement shown in fig. the ends P and Q of an un stretchable string move downwards with a uniform speed U. Pulleys A and B are fixed. Mass M moves upwards with a speed of

Pulley system with mass is M and speed is U

Pulley System with Mass is M and Speed is U

In this figure we show the pulleys system, mass is M and speed is U.

Choices

Choice (4) Response

a.

2U cos θ

b.

2U/cos θ

c.

U cos θ

d.

U/cos θ

Question number: 398

» Laws of Motion » Momentum

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Question

A particle of mass 3 kg is moving under the action of a central force whose potential energy is given by U (r) = 10r 3 joule. For what energy and angular momentum will the orbit be a circle of radius 10 m?

Choices

Choice (4) Response

a.

2.5 x 104 J, 3000 kgm 2 /sec

b.

2.5 x 103 I, 300 kgm 2 /sec

c.

3.5 x 104 I, 2000 kgm 2 /sec

d.

3.5 x 103 J, 300 kgm 2 /sec

Question number: 399

» Electrostatics » Electric Field Due to a Point Charge

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MCQ▾

Question

Electric field at point P is given as

Choices

Choice (4) Response

a.

r -4

b.

r -2

c.

r -3

d.

r -1

Question number: 400

» Laws of Motion » Force and Inertia

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MCQ▾

Question

In figure ABCDE is a channel in the vertical plane, part BCDE being circular with radius r. A ball is released from A and slides without friction and without rolling. It vr”- complete the loop path when

Motion graph explained by ABCDE

Motion Graph Explained by ABCDE

In this fig we show the motion of ball as ABCDE is a vertical plane and BCDE with circular path with radius r

Choices

Choice (4) Response

a.

h > 5r/2

b.

h < 2r/5

c.

h < 5 r/2

d.

h > 2r/5