# Laws of Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 116

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## Question number: 1

» Laws of Motion » Centripetal Force

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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.

0.4 N

b.

2N

c.

4N

d.

0.8 N

## Question number: 2

» Laws of Motion » Centripetal Force

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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.

2N

b.

4N

c.

0.2 N

d.

0.4 N

## Question number: 3

» Laws of Motion » Centripetal Force

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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 but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is false but Ꭱ is true

## Question number: 4

» Laws of Motion » Centripetal Force

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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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