Laws of Motion (NEET Physics): Questions 1 - 4 of 116

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Question number: 1

» Laws of Motion » Centripetal Force

MCQ▾

Question

A body of mass 0.2 kg is moving on circular path of diameter 2.0 m at the rate of 10 revolutions per 31.4 seconds. The centripetal force acting on the body is -

Choices

Choice (4) Response

a.

2N

b.

4N

c.

0.4 N

d.

0.8 N

Question number: 2

» Laws of Motion » Centripetal Force

MCQ▾

Question

A body of mass 0.1 kg is moving on circular path of diameter 1.0 m at the rate of 10 revolutions per 31.4 seconds. The centripetal force acting on the body is -

Choices

Choice (4) Response

a.

0.2 N

b.

4N

c.

2N

d.

0.4 N

Question number: 3

» Laws of Motion » Centripetal Force

Assertion-Reason▾

Assertion (Ꭺ)

If net force F acting on a system is changing in direction only, the linear momentum (p) of system changes in direction.

Reason (Ꭱ)

In case of uniform circular motion, magnitude of linear momentum is constant but direction of centripetal force changes at every instant. You have to select the correct choice.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

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: 4

» Laws of Motion » Centripetal Force

MCQ▾

Question

An electron is moving in a circular orbit of radius 5.3 x 10 -11 metre around the atomic nucleus at a rate of 6.6 x 1015 revolutions per second. The centripetal force acting on the electron will be -

(The mass of the electron is 9.1 x 10 - 31kg)

Choices

Choice (4) Response

a.

b.

c.

d.

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