Uniform Circular Motion MCQs
Q: What could be the reason a car moving on a horizontal road gets thrown out of the road while taking a turn
a) Due to the reaction of the ground
b) Due to rolling frictional force between tyre and road
c) By the gravitational force
d) Due to lack of sufficient centripetal force
Answer: (d) Due to lack of sufficient centripetal force
Q: If a particle moves with constant angular velocity in a circle then during the motion its
a) Momentum is conserved
b) Energy is conserved
c) Both energy and momentum is conserved
d) None of the above is conserved
Answer: (b) Energy is conserved
Q: A stone tied to a string is rotated in a circle. If the string is cut, the stone flies away from the circle because
a) A centrifugal force acts on the stone
b) Of its inertia
c) A centripetal force acts on the stone
d) The reaction of the centripetal force
Answer: (b) Of its inertia
Q: A body moves with a constant speed along a circle. Then,
a) No work is done on it
b) There is no acceleration produced in the body
c) No force acts on the body
d) The body has constant velocity
Answer: (a) No work is done on it
Q: A tachometer is a device to measure
a) Gravitational pull
b) Speed of rotation
c) Surface tension
d) Tension in a spring
Answer: (b) Speed of rotation
Q: The angular velocity of a body moving with a constant speed v in a circle of radius r is given by
a) v2/r
b) vr
c) v/r
d) r/v
Answer: (c) v/r
Q: A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is
a) Doubled
b) Quadrupled
c) Halved
d) Unchanged
Answer: (b) Quadrupled
Q: What will be the velocity vector of a particle moving in a circle describing equal angles in equal times
a) Changes in direction
b) Remains constant
c) Changes in magnitude
d) Changes both in direction and magnitude
Answer: (a) Changes in direction
Q: A body moves with a constant speed in a circular path is moving in a circular path with a constant speed. It has
a) Acceleration of constant magnitude
b) Constant velocity
c) Constant acceleration
d) An acceleration which varies with time
Answer: (a) Acceleration of constant magnitude
Q: A motorcyclist going with a constant speed in a circular track has
a) Linear velocity is constant
b) Constant acceleration
c) Angular velocity is constant
d) Constant force
Answer: (c) Angular velocity is constant
