Circular Motion : General Science MCQ Practice Questions & Answers (Hindi)

1.

Which of the following statements is not true for a stone attached to a string and swung in a uniform vertical circular motion?

A

The magnitude of resultant force acting on the stone changes depending on the position of the stone in the circle.

B

The tension in the string is lowest when the stone is at the highest point of the circular motion.

C

The kinetic energy of the stone is constant throughout the entire circular motion.

D

The resultant acceleration is always directed towards the centre of the circle.

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2.

Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

A

The inside horse

B

The outside horse

C

Neither—they both have the same linear speed.

General ScienceEasyCircular Motion

3.

When particle revolves with uniform speed on a circular path

A

no force acts on it

B

no acceleration acts on it

C

no work is done by it

D

its velocity is constant

General ScienceEasyCircular Motion

4.

What is the direction of the force that acts on clothes in the spin cycle of a washing machine?

A

Inward

B

Down

C

Outward

D

Up

General ScienceEasyCircular Motion

5.

The clock on Big Ben has a minute hand of length 4.3 m and an hour hand of length 2.7 m. What is the ratio of the centripetal acceleration of a point on the tip of the minute hand to a point on the tip of the hour hand?

A

1.6

B

150

C

230

D

5700

General ScienceEasyCircular Motion

6.

The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is

A

friction.

B

his weight.

C

the normal force.

D

none of the above

General ScienceEasyCircular Motion

7.

In a vertical circle of radius r at what point in its path, a particle has a tension equal to zero?

A

Highest point

B

Lowest point

C

Any point

D

A horizontal point

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8.

If you whirl a tin can on the end of a string and the string suddenly breaks, the can will

A

fly directly away from you.

B

fly off, tangent to its circular path.

C

fly directly toward you.

D

spiral in toward your hand.

General ScienceEasyCircular Motion

9.

For a particle performing a U.C.M. the acceleration is

A

constant in direction

B

constant in magnitude but not in the direction

C

constant in magnitude and direction

D

constant in neither magnitude nor in direction

General ScienceEasyCircular Motion

10.

Earth rotates and revolves through space. Earth rotates about the ............., which is an..............axis. Earth revolves about the................, which is an..............axis.

A

sun, external, North/South pole, internal

B

North/South pole, external, sun, internal

C

sun, internal, North/South pole, external

D

North/South pole, internal, sun, external

General ScienceEasyCircular Motion

11.

Decreasing the mass of an object on a circular path but keeping its velocity and radius constant

A

increases the centripetal force on the object

B

decreases the centripetal force on the object

C

does not affect the centripetal force on the object

D

depends on the specific situation

General ScienceEasyCircular Motion

12.

Applying a force to an object perpendicular to its direction of motion will cause the object to

A

change speed but not direction

B

change direction but not speed

C

change the magnitude of its acceleration

D

not change its speed or direction

General ScienceEasyCircular Motion

13.

An object moves in a circle with a period of 0.025 hours. What is its frequency in Hz?

A

90 Hz

B

263 Hz

C

0.1 Hz

D

0.01 Hz

General ScienceEasyCircular Motion

14.

An airplane is taking a turn in a horizontal plane

A

its remains horizontal

B

it inclines inward

C

it inclines outward

D

its wings become vertical

General ScienceEasyCircular Motion

15.

After closing a deal with a client, Kent leans back in his swivel chair and spins around with a frequency of 0.8 Hz. What is the period of Kents spin?

A

0.8 s

B

2 Hz

C

1.25 s

D

1 Hz

General ScienceEasyCircular Motion

16.

A tin can whirled on the end of a string moves ina circle because

A

once the can starts moving, that is its natural tendency.

B

there is a force on the can pulling it outward.

C

there is an inward force acting on the can.

D

the can continually pulls on the string.

General ScienceEasyCircular Motion

17.

A stone is tied to one end of a string. Holding the other end, the string is whirled in a horizontal plane with progressively increasing speed. It breaks at some speed because

A

The required centripetal force is greater than the tension sustained by the string.

B

The required centripetal force is less than the tension in the string.

C

The centripetal force is greater than the weight of the stone.

D

Gravitational forces of the earth are greater than the tension in the string.

General ScienceEasyCircular Motion

18.

A small car is being driven in a circular path at constant speed on a horizontal surface. What is the direction of the frictional force that keeps the car from skidding as it travels along this path?

A

in the same direction as the velocity of the car

B

toward the center of the circle

C

outward from the center of the circle

D

opposite the direction of the velocity of the car

General ScienceEasyCircular Motion

19.

A satellite moving in a circular orbit around Earth and maintaining a constant speed will experience a

A

net gravitational force towards Earth.

B

changing acceleration away from Earth.

C

net acceleration away from Earth.

D

changing gravitational force towards Earth.

General ScienceEasyCircular Motion

20.

A rock attached to a string swings in a vertical circle. At the highest point,

A

only one force acts on the rock.

B

two forces act on the rock and their resultant is zero.

C

two forces act on the rock and their resultant is not zero.

D

no forces act on the rock.

Circular Motion in General Science : Practice MCQ Questions & Answers with Explanations

Circular Motion in General Science : Practice MCQ Questions & Answers with Explanations