# MCQs on Uniform Circular Motion

**MCQs on Uniform Circular Motion**

**Q1: The angular velocity of a body moving with a constant speed v in a circle of radius r is given by **

- v
^{2}/r - vr
- v/r
- r/v

**Answer: (c) v/r**

**Q2: A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is**

- Doubled
- Quadrupled
- Halved
- Unchanged

**Answer: (b) Quadrupled**

**Q3: What will be the velocity vector of a particle moving in a circle describing equal angles in equal times**

- Changes in direction
- Remains constant
- Changes in magnitude
- Changes both in direction and magnitude

**Answer: (a) Changes in direction**

**Q4: A body moves with a constant speed in a circular path is moving in a circular path with a constant speed. It has**

- Acceleration of constant magnitude
- Constant velocity
- Constant acceleration
- An acceleration which varies with time

**Answer: (a) Acceleration of constant magnitude**

**Q5: A motorcyclist going with a constant speed in a circular track has **

- Linear velocity is constant
- Constant acceleration
- Angular velocity is constant
- Constant force

**Answer: (c) Angular velocity is constant**

**Q6: What could be the reason a car moving on a horizontal road gets thrown out of the road while taking a turn**

- Due to the reaction of the ground
- Due to rolling frictional force between tyre and road
- By the gravitational force
- Due to lack of sufficient centripetal force

**Answer: (d) Due to lack of sufficient centripetal force**

**Q7: If a particle moves with constant angular velocity in a circle then during the motion its**

- Momentum is conserved
- Energy is conserved
- Both energy and momentum is conserved
- None of the above is conserved

**Answer: (b) Energy is conserved**

**Q8: 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 centrifugal force acts on the stone
- Of its inertia
- A centripetal force acts on the stone
- The reaction of the centripetal force

**Answer: (b) Of its inertia**

**Q9: A body moves with a constant speed along a circle. Then,**

- No work is done on it
- There is no acceleration produced in the body
- No force acts on the body
- The body has constant velocity

**Answer: (a) No work is done on it**

**Q10: A tachometer is a device to measure**

- Gravitational pull
- Speed of rotation
- Surface tension
- Tension in a spring

**Answer: (b) Speed of rotation**