(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

Give an example of motion in which the average speed is not zero but the average velocity is zero.

Which of the quantity-velocity or acceleration-determines the direction of motion?

Give one example of following motion :

Uniform velocity

Give one example of following motion :

Variable velocity

The diagram below shows the pattern of the oil on the road at a constant rate from a moving car. What information do you get from it about the motion of the car.

The speed of a car is 72 km h^-1. Express it in m s^-1.

Express 15 m s^-1 in km h^-1.

Express the following in m s⁻¹.

1 km h⁻¹

Express the following in m s^-1.

18 km min^-1

Arrange the following speeds in increasing order.

10 m s^-1, 1 km min^-1 and 18 km h^-1.

A car travels the first 30 km with a uniform speed of 60 km h⁻¹ and the next 30 km with a uniform speed of 40 km h⁻¹. Calculate :

1. The total time of journey,
2. The average speed of the car.

A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find:
 The average speed,
 The average velocity of the train.

A car moving on a straight path covers a distance of 1 km due east in 100 s. What is the speed of the car?

A car moving on a straight path covers a distance of 1 km due east in 100 s. What is velocity of the car?

A car accelerates at a rate of 5 m s^-2. Find the increase in its velocity in 2 s.

A car is moving with a velocity 20 m s^-1. The brakes are applied to retard it at a rate of 2 m s^-2. What will be the velocity after 5 s of applying the brakes?

A car is moving in a straight line with speed 18 km h^-1. It is stopped in 5 s by applying the brakes. Find:

1. the speed of car in m s^-1
2. the retardation and
3. the speed of car after 2 s of applying the brakes.

For the motion with uniform velocity , how is the distance travelled related to the time ? 

Draw the shape of the velocity-time graph for a body moving with (a) Uniform velocity and (b) Uniform acceleration.

Figure shows the displacement of a body at different times . 

Calculate the velocity of the body as it moves for time interval :
(i) 0 to 5 s,
(ii) 5 s to 7 s 
(iii) 7 s to 9 s.