NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 197 - 200 of 2184

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Question number: 197

» Kinematics » Motion in a Straight Line

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MCQ▾

Question

If t 1 be the time taken by a body to clear the top of a building and be the time spent in air, then t 2: t 1 will be -

Choices

Choice (4) Response

a.

1: 4

b.

1: 2

c.

2: 1

d.

1: 1

Question number: 198

» Laws of Motion » Centripetal Force

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MCQ▾

Question

Choose the correct statements

(1) Centripetal force is not a real force. It is only the requirement for circular motion.

(2) Work done by centripetal force may or may not be zero.

(3) Work done by centripetal force is always zero.

(4) Centripetal force is a fundamental force.

Choices

Choice (4) Response

a.

1 and 3

b.

2 and 4

c.

1,2 and 3

d.

1 and 2

Question number: 199

» Kinematics » Motion in a Straight Line

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Assertion-Reason▾

Question

Assertion (Ꭺ)

A cyclist is cycling on rough horizontal circular track with increasing speed. Then the frictional force on cycle is always directed towards center of the circular track.

Reason (Ꭱ)

For a particle moving in a circle, radial component of net force should be directed towards center. You have to select the correct choice.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 200

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

The angular speed with which the earth would have to rotate on its axis so that a person on the equator would weigh (3/5) th as much as present, will be: (Take the equatorial radius as 6400 km)

Choices

Choice (4) Response

a.

7.8 x 10 3 rad/sec

b.

7.8 x 10 4 rad/sec

c.

8.7 x 10 3 rad/sec

d.

8.7 x 10 4 rad/sec