Quiz  /  Uniform Circular Motion Class 12 MCQ Questions With Answers

  • 1. 
    Which of the following is a tangent to the point on the circle?

  • A
  • A & B
  • A, B & D
  • C

  • 2. 
    Uniform circular motion is an accelerated motion

  • True
  • False
  • Don't Know

  • 3. 
    In a uniform circular motion

  • velocity is constant
  • acceleration is constant
  • speed is constant
  • All of the above

  • 4. 
    A pilot experiences centripetal acceleration of 2g's while maneuvering a loop at a speed of 400 m/s. What is the radius of the loop? (1g =9.8 m/s2)

  • 203 m
  • 8163 m
  • 80,003 m
  • 23 m

  • 5. 
    Which of the following depict the speed/velocity of the moving ball?

  • A
  • B
  • C
  • D

  • 6. 
    Suppose the speed of the car is 11.1 m/s and the radius of curvature (r) is 25 m; determine the magnitude of the centripetal acceleration.

  • 5 m/s/s
  • 0.2 m/s/s
  • 15.8 m/s/s
  • 11 m/s/s

  • 7. 
    Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug A is at a radius of 4 cm, while bug B is at a radius of 8 cm. Which of the following is true?

  • Bug A has a greater angular velocity
  • Bug B has a greater angular velocity.
  • Bug A has a greater linear velocity.
  • Bug B has a greater linear velocity.

  • 8. 
    The wheels of a car have radius 0.330 m. and are rotating at 600.0 rpm. Determine the speed of the car in miles/hour to the nearest tenth. (Determine ω (angular velocity) first and then use v=ω⋅r and convert to km/hour)

  • 11.88 km/hour
  • 685.4 km/hour
  • 74.64 km/hour
  • 74640 km/hour

  • 9. 
    A car moving around a curve at a constant speed of 150 mph is accelerating.

  • True, because it is moving at a constant speed.
  • True, because it is changing direction.
  • False, because it is not a constant velocity.
  • False, because it is moving at a constant speed.

  • 10. 
    A car makes a left turn, a book on the front seat slides to the right...why?

  • centripetal acceleration of the book
  • centripetal force of the book
  • will power
  • inertia of the book

  • 11. 
    Acceleration causes a change in velocity so acceleration can cause

  • a change in speed only.
  • a change in speed or direction.
  • a change in direction only.

  • 12. 
    What would act as the centripetal force for a car on a circular track?

  • Friction
  • Gravitation
  • Tension
  • None of These

  • 13. 
    Determine the central angle if the arc length is 10 cm and the radius is 5 cm. Convert to degrees.

  • 2°
  • not possible ... "s" is too small
  • ≈ 114.6°
  • 360°

  • 14. 
    Centripetal acceleration acts towards the ___________ of the circular motion

  • centre
  • circumference

  • 15. 
    A rubber stopper on the end of string is swung steadily in a horizontal circle. In one trial, it moves at speed v in a circle of radius r. In a second trial, it moves at a higher speed 3v in a circle of radius 3r. In the second trial the acceleration is

  • the same as in the first trial
  • three times larger
  • one-third as large
  • nine times larger
  • One-ninth as large.

  • 16. 
    A car travels clockwise at a constant speed around the oval track shown. What is the direction of the velocity vector for point W?

  • A
  • B
  • C
  • D
  • E

  • 17. 
    A car on an oval track starts from rest at point R and moves clockwise around the track. It increases speed at a constant rate until it reaches point T then travels at a constant speed until it returns to point R. What is the direction of the velocity vector at point S?

  • A
  • B
  • C
  • D
  • E

  • 18. 
    An object in uniform circular motion is (choose all that apply)

  • traveling at a constant speed
  • accelerating
  • not accelerating
  • moving in one direction
  • Both A & B

  • 19. 
    Determine the angular velocity in rad/min of a gyroscope rotating at 6 rps (revolutions per second). Leave answer in terms of π.

  • 360π rad/min
  • 12π rad/min
  • 360 rad/min
  • 720π rad/min

  • 20. 
    A spin balancer rotates the wheel of a car at 500 revolutions per minute. What is the angular speed in degrees per second?

  • 16.67 deg / sec
  • 6,000 deg / 1 sec
  • 3,000 deg / 1 sec
  • 180,000 deg / 1 sec

  • 21. 
    A specific vehicle can go around a curve with a radius of 150 m with a maximum speed of 32 m/s without sliding off the road. To have the same acceleration, at what maximum speed can the same vehicle go around a curve having a radius of 75 m?

  • 64 m/s
  • 45 m/s
  • 32 m/s
  • 23 m/s
  • 16 m/s

  • 22. 
    A horse gallops around a circular arena. The centripetal force on the horse is ___.

  • directed outward
  • tension
  • directed toward the center of the arena
  • 9.8 N

  • 23. 
    The mints rotating on top of the turntable all have the same tangential velocity.

  • True
  • False

  • 24. 
    For an object to be in uniform circular motion the direction of the acceleration is

  • perpendicular to the direction of travel.
  • parallel to the direction of travel.
  • diagonally inwards between the direction of travel and the center of the circle.
  • diagonally outwards away from the center of the circle but in the same direction of travel.
  • diagonally inwards towards the center of the circle but opposite to the direction of the velocity.

  • 25. 
    A ceiling fan with 16 inch blades rotates at 45 rpm. Find the angular velocity of the fan in rad/min. Round to the nearest tenth.

  • 90 rad/min
  • 282.7 rad/min
  • 45 rad/min
  • 141.4

  • 26. 
    A 3.0 N centripetal force acts on a toy car, if the car's mass is doubled then the force is... ΣFnet = mv2r\Sigma F_{net}\ =\ \frac{mv^2}{r}ΣFnet​ = rmv2​

  • 3.0 N
  • 6.0 N
  • 9.0 N
  • 1.5 N
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