The SI of velocity is

1

(a)

\(ms^{ -1 }\)

(b)

\(ms^{ -2 }\)

(c)

\(ms^{ -3 }\)

(d)

\(Nm^{ -1 }\)

The initial velocity of a body is u.It is under uniform acceleration a its velocity v at any time t is given by

1

(a)

\(v=u+at^{ 2 }\)

(b)

\(v=u+\frac { 1 }{ 2 } at^{ 2 }\quad \)

(c)

v = u + at

(d)

v = u

A ball is thrown vertically upwards It rises to a height of 50 m and comes back to the thrower

1

(a)

the total distance covered by the ball is zero

(b)

the net displacement of the ball is zero

(c)

the displacement is 100 m

(d)

none of the above

The initial velocity of a train which is stopped in 20 s by applying brakes retardation due to brakes being 1.5 \(ms^{ -2 }\) is

1

(a)

30 \(ms^{ -2 }\)

(b)

30 \(cm^{ -1 }\)

(c)

20 \(cm^{ -1 }\)

(d)

24 \(ms^{ -1 }\)

The slope of speed-time graph gives

1

(a)

speed

(b)

velocity

(c)

acceleration

(d)

momentum

The distance travelled by a freely falling body is proportional to the

1

(a)

mass of the body

(b)

square of the time of fall

(c)

square of the acceleration due to gravity

(d)

time of fall

In the maximum speed of the marble is 

1

(a)

20\(m/s^{ 1 }\)

(b)

40 \(m/s^{ 1 }\)

(c)

60 \(m/s^{ 1 }\)

(d)

80 \(m/s^{ 1 }\)

Displacement is a .......... quantity and distance is a ..................... quantity

1

(a)

Displacement is a vector quantity, Distance is a scalar quantity

Define speed of body.

1

(a)

Speed of body is equal to total distance travelled by the body by the total time taken to travel that distance... its SI unit is kilometres per hour or miles per hour or metre per second.

What does the odometer of an automobile measure?

1

(a)

Define the terms rest and motion Give one example for each.

2

(a)

What is meant by a point object? Give some examples.

2

(a)

When is a body said to have
(i) uniform velocity; and
(ii) variable velocity?

2

(a)

Distinguish between speed and velocity.

2

(a)

A bus decreases its speed from 80 km \(h^{ -1 }\) to 60 km  \(h^{ -1 }\) in 5 s. Find the acceleration of the bus.

2

(a)

Give two differences between distance and displacement

3

(a)

Define the term average speed.

3

(a)

Define acceleration .Is it a scalar or a vector quantity?

3

(a)

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?

3

(a)

What is non-uniform motion? Give some examples.

4

(a)

On a 100 km track , a train travels the first 30 km at a uniform speed of 30 km \(h^{ -1 }\)How fast must the train travel the next 70 km so as to average 40 km \(h^{ -1 }\) for the entire trip?

5

(a)