Rotational and Circular motion mcqs mdcat test 1

Test No.1 Of Circular Motion MCQs

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1 / 50

1. If the rotation is counterclockwise then the angular velocity is directed:

a) out of page, parallel to the axis of rotation

b) into page, parallel to axis of rotation

c) Out of page, perpendicular axis of rotation

d) into page, perpendicular to axis of rotation

2 / 50

2. A fan is making 600rev/min. If after 10 sec its makes 1200 rev/min, then angular acceleration of fan is equal to

a) 10.2 rad/s

b) 8.30 rad/s

c) 5.20 rad/s

d) 6.28 rad/s

3 / 50

3. The product of distance of the particle from axis of rotation and angular velocity is known

a) Centripetal acceleration

b) Angular acceleration

c) Tangential velocity

d) Angular displacement

4 / 50

4. Centripetal acceleration and radius are always:

a) Parallel

b) Anti-parallel

c) Perpendicular

d) May be parallel anti parallel or perpendicular.

5 / 50

5. Angular velocity and angular acceleration are antiparallel to each other when:

a) Body moves with increasing angular velocity

b) Body moves with decreasing angular velocity

c) When rate of rotation of is increasing

d) None of them

6 / 50

6. Rate of change of angular displacement is called:

a) Angular acceleration

b) Angular Velocity

c) Both

d) None of these

7 / 50

7. In UCM body moves with uniform:

a) Speed

b) Velocity

c) Acceleration

d) None of these

8 / 50

8. A car is taking a turn on a level road. It may be thrown outwards because of the:

a) Reaction of the ground

b) Frictional force

c) Lack of centripetal force

d) Weight

9 / 50

9. An object is moving along a circular path of radius 4m. What will be its angular displacement if it moves 14m on this circular path?

a) 5.5 radians

b) 3.5 radians

c) 5.0 radians

d) 4.5 radians

10 / 50

10. A circle of radius 1m rolls through some distance making an angle 180º at the centre; find the distance

a) 3.14 m

b) 3.14 rad

c) 5m

d) 2.8m

11 / 50

11. When a body moves along a circular path, it velocity:

a) Remains constant

b) Becomes zero

c) Changes continuously

d) Always increases

12 / 50

12. In uniform circular motion, the factor that remains constant is

a) Linear velocity

b) Speed

c) Acceleration

d) All of these

13 / 50

13. If a particle moves with uniform speed that its tangential acceleration will be

a) Zero

b) Constant

c) Infinite

d) None of these

14 / 50

14. When a body is moving along a circular path it covers a certain angle in a given interval of time. Such type of motion is

a) Vibratory motion

b) Linear motion

c) Rotatory motion

d) Angular motion

15 / 50

15. Work done due to centripetal force is

a) Maximum

b) Remains same

c) Minimum

d) Zero

16 / 50

16. 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

a) Its velocity is constant

b) Its acceleration is constant

c) Its motion is linear

d) Its motion is circular

17 / 50

17. The linear acceleration of a car is 10m/s. If the wheels of the car have a diameter of 1m, the angular velocity of the wheels will be

a) 10 rad/sec

b) 1 rad/sec

c) 2 rad/sec

d) 20 rad/sec

18 / 50

18. Angle between centripetal acceleration and radius vector is

a) 90⁰

b) 180⁰

c) 0⁰

d) 45⁰

19 / 50

19. All particles of a rigid body rotating about a fixed axis may not have same

a) Speed

b) Axis of rotation

c) Angular displacement

d) Direction of angular velocity

20 / 50

20. A particle of rigid body is at a distance 0.1 m from axis of rotation to rotate with linear speed 3 m/s. What is angular speed of the rigid body

a) 03 rad/s

b) 30 rad/s

c) 5 rad/s

d) 1.5 rad/s

21 / 50

21. A particle in travels in a circular path of radius 0.2m with a constant kinetic energy of 4J. what is the net force on this particle?

a) 4N

b) 16N

c) 20N

d) 40N

22 / 50

22. Tangential velocity of a particle moving along a circular path is actually is

a) radial velocity

b) angular velocity

c) axial velocity

d) linear velocity

23 / 50

23. In S.I system the unit of angular acceleration is :

a) rad/sec

b) meter/second

c) rad per second per second

d) meter per second per second

24 / 50

24. The direction of angular velocity can be assigned by using :

a) left hand rule

b) right hand curl rule

c) Cavendish rule

d) savant law

25 / 50

25. Rpm is the unit of :

a) angular displacement

b) angular acceleration

c) centripetal acceleration

d) angular velocity

26 / 50

26. Motion of moon around the earth is an example of
(a) Uniform circular motion
(b) Circular motion
(c) Both (a) and (b)
(d) None of these

a) Uniform circular motion

b) Circular motion

c) Both (a) and (b)

d) None of these

27 / 50

27. A stone of mass 8kg is attached to a string 72m long and is whirled in a horizontal circle. The string can stand a maximum tension of 64N. The maximum safe velocity is?

a) 12 m/s

b) 8 m/s

c) 24 m/s

d) 4 m/s

28 / 50

28. Tangential acceleration of a point on a rotating object is the product:

a) Distance of a point from axis of rotation and angular velocity

b) Distance of a point from axis of rotation and angular acceleration

c) Angular displacement and time

d) angular velocity and time

29 / 50

29. the speed of a shaft is 1500 rpm then it frequency is :

a) 100Hz

b) 75Hz

c) 25Hz

d) 50Hz

30 / 50

30. A stone of mass m tied to a string of length L is rotated in a circle with the other end of the string as the centre. The speed of the stone is v. If the string breaks, the stone will:

a) it will stopped due to inertia

b) move along straight path tangent to circle

c) move away from the centre

d) move towards the centre

31 / 50

31. The relation between tangential and angular acceleration is :

a) ∝ = a × r

b) a = ∝ × r

c) r= ∝ × a

d) a= r ×∝

32 / 50

32. If the speed of an object is increasing or decreasing while moving along a circular path (motion is not uniform ) then object :

a) Must have centripetal acceleration

b) Must have tangential acceleration

c) Only has centripetal acceleration

d) Must have both accelerations

33 / 50

33. The acceleration produce by virtue of the changing direction of the velocity of an object moving in a circular path is called :

a) Angular acceleration

b) centripetal acceleration

c) Tangential acceleration

d) acceleration due to gravity

34 / 50

34. A car is travelling at a constant speed of 72km/hr rounds a curve of radius 100m. what is the centripetal acceleration :

a) 2m/s²

b) 4m/s²

c) 8m/s²

d) 12m/s²

35 / 50

35. A 200 gram ball is tied to the end of a cord and whirled in a horizontal circle of radius 0.6m. if the ball makes five complete revolutions in 2sec find the centripetal force ?

a) 148 N

b) 9.42N

c) 29.6N

d) 20N

36 / 50

36. Saad has mass 80kg when resting on the ground at the equator. What will be the centripetal force on saad if the radius of the earth is 6.4×10⁶m

a) 2.67 N

b) 8 N

c) 800 N

d) 15 N

37 / 50

37. When a stone is whirled in a horizontal circle by mean of string, the centripetal force is supplied by

a) inertia of stone

b) weight of stone

c) tension in string

d) force of friction

38 / 50

38. A truck of mass 1000kg moves on a circular path with a speed of 20m/s. Its direction changes by 90⁰ after travelling 628m on the road . the centripetal force acting on the truck

a) 500N

b) 1000N

c) 1500N

d) 2000N

39 / 50

39. When a car is moving round a corner track, the necessary centripetal force is provided by :

a) its weight

b) its engine

c) force of friction between track and its tyres

d) A.O.T

40 / 50

40. Tangential velocity of a particle moving along a circular path is actually is

a) radial velocity

b) angular velocity

c) axial velocity

d) linear velocity

41 / 50

41. A car moving on horizontal road may be thrown out of the road while taking a turn :

a) by the gravitational force

b) due to lake of proper centripetal force

c) due to the lack of frictional force b/w tire and road

d) due to reaction of the road

42 / 50

42. A scooter is going round a circular road of radius 100 m at a speed of 10 m/s. The angular speed of the scooter will be :

a) 0.01 rad/s

b) 0.1 rad/s

c) 1 rad/s

d) 10 rad/s:

43 / 50

43. If the rotation is clockwise then the angular velocity is directed :

a) out of page, parallel to the axis of rotation

b) into page , parallel to axis of rotation

c) out of page, perpendicular axis of rotation

d) into page, perpendicular to axis of rotation

44 / 50

44. When a body is performing uniform circular motion along a circular path then which of following quantities must be changed :

I.kinetic energy

II.Speed

III. Momentum

IV. Velocity

a) I & IV only

b) I & III only

c) III & IV

d) I,,III & IV

45 / 50

45. A stone is tied to string and whirled in a vertical circle , when the stone is at highest position the tension in string :

a) maximum

b) minimum

c) equal to weight of stone

d) less than weight of zero

46 / 50

46. An object travels at constant speed around the circle of radius 1m in one second what is the magnitude of its acceleration :

a) 0

b) 1 m/s²

c) 2π m/s²

d) 4π2 m/s²

47 / 50

47. A racing car is speeding around a flat , unbanked circular track whose radius is 250 m . the car speed is constant 50 m/s . the mass of the car is 2000 kg . the centripetal force necessary to keep the car in its circular orbit is provided by

a) weight

b) string of car

c) force of friction between tire and road

d) stability of car

48 / 50

48. An object is moving around a circle of radius 14 m at a constant speed of 22m/s. the frequency of the motion in cycles per second is :

a) 4

b) 2

c) 0.25

d) 0.5

49 / 50

49. Which of the following statements about circular motion is correct?

a) Circular motion is characterized by an object moving in a straight line at a constant speed.

b) In circular motion, the acceleration of the object is always directed towards the center of the circle.

c) Circular motion can only occur on a horizontal plane and not on a vertical plane.

d) The speed of an object in circular motion remains constant throughout the motion.

50 / 50

50. A car going around a certain curve at a speed of 25 km/hr , has a centripetal force acting on it of 100 N . if the speed of the car is doubled , the centripetal

a) Quadrupled

b) doubled

c) multiplied by √2

d) reduce to ½ of the original value