NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 397 - 400 of 2142

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Question number: 397

» Laws of Motion » Momentum

MCQ▾

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.

3.5 x 104 I, 2000 kgm 2 /sec

b.

2.5 x 103 I, 300 kgm 2 /sec

c.

2.5 x 104 J, 3000 kgm 2 /sec

d.

3.5 x 103 J, 300 kgm 2 /sec

Question number: 398

» Electrostatics » Electric Field Due to a Point Charge

MCQ▾

Question

Electric field at point P is given as

Choices

Choice (4) Response

a.

r -3

b.

r -1

c.

r -4

d.

r -2

Question number: 399

» Laws of Motion » Force and Inertia

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

Question number: 400

» Electrostatics » Capacitors

Assertion-Reason▾

Assertion (Ꭺ)

If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.

Reason (Ꭱ)

Capacity of the capacitor does not depend upon the nature of the material of plates.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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