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Average Speed

Write True T ...

Question

Write True (T) or False (F) against the following statements in the given brackets:
1. SI unit of speed is m/s. ( )
2. Velocity is a scalar physical quantity. ( )
3. A body in motion can never have zero average velocity. ( )
4. Every object moves with a constant speed. ( )
5. A pendulum shows oscillatory motion. ( )
6. The speed of a train is expressed in m/h. ( )

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Solution

1. True

2. False
Velocity is a vector quantity.

3. True

4. False
Every object need not necessarily move with constant speed.

5. True

6. False
The speed of a train is expressed in km/h.

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Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Periodic motion is that which repeats itself after regular intervals of time. ( )
2. Metre is the standard unit of length. ( )
3. Motion in a straight line is called rectilinear motion. ( )
4. Motion of the needle of a sewing machine is circular motion. ( )
5. Motion of wheel of a bicycle is rectilinear. ( )
6. An object can have more than one type of motion. ( )

Q. Consider the following statements and select the option which correctly identifies the true (T) and false (F) statements.
(i) Distance is the magnitude of displacement in all cases.
(ii) When a body moves with uniform speed,then the average speed is same as instantaneous speed.
(iii) Average speed is greater than the average velocity if a body is moving in a straight line without reversing its directions.
(iv) When a body moves with constant velocity, the average velocity is zero.

Q. Consider the given statements and select the option which correctly identifies the true

(T)

(F)

statements.
(i) Distance is the magnitude of displacement in all cases.
(ii) When a body moves with uniform speed, then the average speed is same as instantaneous speed.
(iii) Average speed is greater than the average velocity if a body is moving in a straight line without reversing its direction.
(iv) When a body moves with constant velocity, the average velocity is zero.

Mark the correct statement(s)
(1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration.

(2) If velocity of a body is varying, its speed must be varying.

(3) A body moving with varying velocity may have constant speed.

(4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

Q. Which of the following are not correct?

(i) The basic unit of time is second.

(ii) Every object moves with a constant speed.

(iii) Distances between two cities are measured in kilometres.

(iv) The time period of a given pendulum is constant.

(v) The speed of a train is expressed in m/h.

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