Quiz  /  Uniform Circular Motion Class 11 MCQ Questions With Answers

  • 1. 
    What happens to the centripetal force exerted on an object if you triple the velocity?

  • it increases to 3X
  • it decreases to 6X
  • it increases to 6X
  • it increases to 9X

  • 2. 
    Which is true about centripetal force and centripetal acceleration?

  • The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force is always pointing outward
  • The centripetal acceleration is always pointing outward from the center of an orbit and the centripetal force is always pointing inward
  • The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center but in a totally different location
  • The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center and in the same exact location as the centripetal acceleration

  • 3. 
    If an object is spinning around on a string and the string was suddenly cut, the object would move in a

  • curved path
  • straight line

  • 4. 
    When an object is in circular motion it is constantly changing its velocity.

  • True
  • False

  • 5. 
    A 1.3 m long fishing line rated as "10 lb test" that can stand a force of 10 lb (44.48 N) is attached to a rock of mass 0.5 kg. The maximum speed at which the rock can be rotated without breaking the line is __________.

  • 10.75 ms-1
  • 10.95 m/s

  • 6. 
    During its trip a car of mass 1500kg is traveling around a corner as shown in the picture. The car rounds a corner of radius 100m at a speed of 15m/s. Find the centripetal force acting on the car.

  • 300N
  • 15000N
  • 3375N
  • 15N

  • 7. 
    Which of the following depict the speed of the blowing ball?

  • A
  • B
  • C
  • D

  • 8. 
    You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you doubled the radius of the circle.

  • 18 N
  • 36 N
  • 72 N
  • 144 N

  • 9. 
    Decreasing the radius when making a turn allows you to____?

  • Increase your friction
  • Keep a high speed
  • Change your inertia
  • Decrease gravitational pull

  • 10. 
    An object is moving in a circle at constant speed. From this, you know that there

  • is no net force acting on the object
  • are two balanced forces acting
  • is an unbalanced force acting on the object
  • must be more than two forces acting on the object

  • 11. 
    The figure shows a coin on a turn-table is rotating at 1.0 r.p.s. The coefficient of static friction between the coin and the turn-table is 0.50. The maximum distance of the coin from the centre O of the turn-table for it to move in a circle is _____________.

  • 0.124 m
  • 0.135 m

  • 12. 
    An object moves in a circle. The net force is 5.0 N. If the student doubles the speed, what force is needed? ΣFnet = mv2r\Sigma F_{net}\ =\ \frac{mv^2}{r}ΣFnet​ = rmv2​

  • 2.5 N
  • 5.0 N
  • 10.0 N
  • 20.0 N

  • 13. 
    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.

  • 14. 
    An object is moving round a horizontal circle of radius 0.80 m, at a constant angular frequency of 20 rpm. The centripetal acceleration of the object is ___________.

  • 3.53 rad s-1
  • 3.73 rad/s

  • 15. 
    When an object is moving in a circle, its linear velocity is often called its __________ velocity.

  • centripetal
  • tangential
  • gravitational
  • centrifugal

  • 16. 
    A particle moves in a horizontal circle of radius 0.60 m with a constant speed and a period of revolution of 0.02 s. The linear velocity of the particle is ____________.

  • 188.50 m/s
  • 188.70 ms-1

  • 17. 
    What's the centripetal force of a 0.2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

  • 2.05 N
  • 2.57 N
  • 2.90 N
  • 3.13 N

  • 18. 
    Which of the following is the best description of what is being depicted (only one answer is correct)?

  • Tangential Velocity
  • Centripetal Acceleration
  • Axis of rotation
  • Angular velocity

  • 19. 
    Why do objects experience centripetal acceleration even though they can have a constant speed?

  • Because they are speeding up as they move in a circle
  • Because they are constantly changing direction and hence, velocity changes, and that net change is directed inward.
  • Because they are constantly changing both speed and direction
  • Because when you have 100 people pedaling, you can speed up more easily.

  • 20. 
    You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?

  • Friction
  • Centripetal Force
  • Gravity
  • Inertia

  • 21. 
    Both centripetal force and centripetal acceleration are directed

  • away from a central point
  • toward a central point
  • tangent to the radius
  • opposite from each other

  • 22. 
    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
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