Circular Motion MCQs Quiz Multiple Choice Questions & Answers

1. A body is moving along a circular path with variable speed, it has

1. A radical acceleration
2. A tangential acceleration
3. Zero acceleration
4. Both radical and tangential acceleration

2. A body is traveling in a circle at a constant speed. It

1. has a constant velocity
2. has no acceleration
3. has an inward acceleration
4. has an outward radial acceleration

3. A body of mass m moves in a horizontal circle of radius r at constant speed v for one complete revolution. Which of the following statements is incorrect?

1. The angular velocity of body is directed perpendicular to the plane of circular motion.
2. The work done by the centripetal force is 2 pi m v².
3. The change in linear momentum of the body is zero.
4. The total energy of the body is constant.

4. A car is making a turn at speed v. The radius of the turn is r and the centripetal force on the car is F. If the car rounds the same curve at speed 2v, the required centripetal force is

1. 1/2 F
2. F
3. 2F
4. 4F

5. A car sometimes overturns while taking a turn. When it overturns, it is

1. The inner wheel which leaves the ground first
2. The outer wheel which leaves the ground first
3. both the wheel leave the ground simultaneously
4. Either inner wheel or the outer wheel leaves the ground

6. A car travels in a circle with constant speed. The net force on the car

1. is zero because the car is not accelerating.
2. is directed forward, in the direction of travel.
3. is directed toward the center of the curve.
4. none of the above

7. A communication satellite is in a circular orbit around Earth. If the speed of the satellite is constant, the force acting on the satellite

1. is zero.
2. is decreasing.
3. points toward the center of the Earth at all times.
4. points in the direction that the satellite is moving.

8. A ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force?

1. Gravity
2. The string
3. There is no force acting on it.
4. The can

9. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle? The motion takes place in a plane. It follows that

1. its velocity is constant
2. its acceleration is constant
3. its motion is linear
4. its motion is circular

10. A particle is performing a U.C.M. Which is the wrong statement regarding its motion?

1. The velocity vector is tangential to the circle
2. The acceleration vector is tangential to the circle
3. The acceleration vector is directed towards the center of the circle
4. The velocity and acceleration vectors are perpendicular to each other

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

1. no forces act on the rock.
2. only one force acts on the rock.
3. two forces act on the rock and their resultant is zero.
4. two forces act on the rock and their resultant is not zero.

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

1. changing gravitational force towards Earth.
2. net gravitational force towards Earth.
3. changing acceleration away from Earth.
4. net acceleration away from Earth.

13. 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?

1. opposite the direction of the velocity of the car
2. in the same direction as the velocity of the car
3. toward the center of the circle
4. outward from the center of the circle

14. 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

1. Gravitational forces of the earth are greater than the tension in the string.
2. The required centripetal force is greater than the tension sustained by the string.
3. The required centripetal force is less than the tension in the string.
4. The centripetal force is greater than the weight of the stone.

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

1. the can continually pulls on the string.
2. once the can starts moving, that is its natural tendency.
3. there is a force on the can pulling it outward.
4. there is an inward force acting on the can.

16. 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?

1. 0.8 s
2. 2 Hz
3. 1.25 s
4. 1 Hz

17. An airplane is taking a turn in a horizontal plane

1. its remains horizontal
2. it inclines inward
3. it inclines outward
4. its wings become vertical

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

1. 90 Hz
2. 263 Hz
3. 0.1 Hz
4. 0.01 Hz

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

1. change speed but not direction
2. change direction but not speed
3. change the magnitude of its acceleration
4. not change its speed or direction

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

1. increases the centripetal force on the object
2. decreases the centripetal force on the object
3. does not affect the centripetal force on the object
4. depends on the specific situation

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

1. sun, external, North/South pole, internal
2. North/South pole, external, sun, internal
3. sun, internal, North/South pole, external
4. North/South pole, internal, sun, external

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

1. constant in direction
2. constant in magnitude but not in the direction
3. constant in magnitude and direction
4. constant in neither magnitude nor in direction

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

1. fly directly away from you.
2. fly off, tangent to its circular path.
3. fly directly toward you.
4. spiral in toward your hand.

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

1. Highest point
2. Lowest point
3. Any point
4. A horizontal point

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

1. friction.
2. his weight.
3. the normal force.
4. none of the above

26. 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?

1. 1.6
2. 150
3. 230
4. 5700

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

1. Inward
2. Down
3. Outward
4. Up

28. When particle revolves with uniform speed on a circular path

1. no force acts on it
2. no acceleration acts on it
3. no work is done by it
4. its velocity is constant

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

1. The inside horse
2. The outside horse
3. Neither—they both have the same linear speed.

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

1. The magnitude of resultant force acting on the stone changes depending on the position of the stone in the circle.
2. The tension in the string is lowest when the stone is at the highest point of the circular motion.
3. The kinetic energy of the stone is constant throughout the entire circular motion.
4. The resultant acceleration is always directed towards the centre of the circle.