Velocity

Q.

The SI unit of velocity is ___

1. miles/s

2. m/hr

3. m/s

4. km/hr

Q.

Which of the following statements is false?

1. If speed is zero, then its velocity also must be zero.

2. If speed is constant, then its velocity also must be constant.

3. If velocity is constant, then its speed also must be constant.

4. If velocity is zero, then its speed also must be zero.

Q.

The following graph (fig.) represents the motion of an object. The velocity of the object is

___

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1. zero

2. constant

3. uniform

4. non uniform

Q.

Which of the following three is travelling the fastest?

1. A

2. B

3. C

4. All are at same speed

Q.

A car travelling at 30m/s , accelerates at the rate10$m/s^2$ for 4 seconds. The final velocity after 4 second will be( in m/s)

1. 30

2. 100

3. 96

4. 70

Q.

Displacement per unit time is defined as ___

1. distance

2. velocity

3. speed

4. acceleration

Q.

Velocity and speed are not comparable units.

1. True

2. False

Q.

Which of the following position-time graphs represents a constant velocity motion?

The position is represented by 'x' and time is represented by 't'.

1. 

2. 

3. 

4. 

Q.

Which of the following pair of quantities cannot be simultaneously non-zero and constant for a body?

1. Speed and velocity

2. Distance and displacement

3. Velocity and acceleration

4. None of these

Q. Describe the motion of a body where the directions of its velocity and acceleration are opposite to each other?

1. Velocity will increase continuosly till acceleration becomes zero.
2. Velocity will decrease only till the object comes to rest.
3. Velocity will decrease to zero, then it will start moving in the direction of acceleration.
4. Velocity will be changing but its speed will be the same.