English Medium Class 9 - CBSE Question Bank Solutions for Science

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?

Certain force acting on a 20 kg mass changes its velocity from 5 m s^-1 to 2 m s^-1. Calculate the work done by the force.

Which of the following conditions will give the most benefits? Why?

Why should preventive measures and biological control methods be preferred for protecting crops?

What factors may be responsible for losses of grains during storage?

Explain any one method of crop production which ensures high yield.

How do storage grain losses occur?

Change the speed of 6 m/s into km/h.

What name is given to the speed in a specified direction ?

Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.

What do the following measure in a car ?
(a) Speedometer (b) Odometer

Name the physical quantity which gives us an idea of how slow or fast a body is moving.

In addition to speed, what else should we know to predict the position of a moving body ?

Under which condition is the magnitude of average velocity equal to average speed ?

What is the SI unit of retardation ?

Fill in the following blank with suitable word:

The physical quantity which gives both, the speed and direction of motion of a body is called its……………

State whether speed is a scalar or a vector quantity. Give reason for your choice.

Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which
bus travels faster ?

Arrange the following speed in increasing order (keeping the least speed first): 

An athlete running with a speed of 10 m/s.