Question

QB. True / False
1. Magnitude of displacement can be equal to or
lesser than distance.
2. If particle speed is constant, acceleration of the
particle must be zero.
3. A body can have constant velocity and still have
varying speed.
4. The movement of the earth about its axis is an
example of uniform speed.
5. Unit of speed in S.I. system is cm/s.
6. A body falls freely from a height with uniform
acceleration.
7. A particle is known to be at rest at time t = 0. Its
acceleration at t = 0 must be zero.
8. In a journey, numerical value of displacement <
distance.
9. If a body is moving on a curved path with
constant speed, then its acceleration is
perpendicular to the direction of motion.​

Answer 1

1. True

2. When a particle moves with a constant speed in the same direction, neither the magnitude nor the direction of velocity changes and so acceleration is zero.

3. No, a body can not have its velocity constant, while its speed varies. Rather, it can have its speed constant and its velocity varying. For example in a uniform circular motion.

4. True

5. False