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

Explain the difference between g and G.

Is there a gravitational attraction between you and the book? Explain.

Does the force of the earth's gravitation affect the motion of the moon? Explain your answer with reasons.

State Newton's law of gravitation. What is the difference between:
Gravity and gravitation

State Newton's law of gravitation. What is the difference between:
g and G?

An apple falls towards the earth due to its gravitational force. The apple also attracts the earth with the same force. Why do we not see the earth rising towards the apple? Explain.

The distance-time values for an object moving along straight line are given below:

Show that gravity decreases at higher altitudes.

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. Retardation due to brakes is 2.5 ms^-2.

Name the agent which decomposes animal dung into biogas.

Which component of biogas is used as a fuel?

What is biogas?

Write any two uses of biogas.

Define the terms : time period as related to a simple pendulum.

How is the time period of a simple pendulum affected, if at all, in the following situations:

1. The length is made four times.
2. The acceleration due to gravity is reduced to one-fourth.

How do you measure the time period of a given pendulum? Why do you note the time for more than one oscillation?

Two simple pendulums A and B have lengths 1.0 m and 4.0 m, respectively, at a certain place. Which pendulum will make more oscillations in 1 min? Explain your answer.

State how does the time period of a simple pendulum depend on (a) length of pendulum, (b) mass of bob, (c) amplitude of oscillation and (d) acceleration due to gravity.

A simple pendulum completes 40 oscillations in one minute. Find its (a) Frequency and (b) Time period.

A body moving with a constant acceleration travels distances 3 m and 8 m, respectively in 1 s and 2 s. Calculate:

1. The initial velocity.
2. The acceleration of body.