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

A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the water surface in the well. Taking g = 10 m s^-2 and speed of sound = 330 m s^-1. Find : The depth of water surface

A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the water surface in the well. Taking g = 10 m s^-2 and speed of sound = 330 m s^-1. Find : The time when echo is heard after the pebble is dropped.

Calculate the velocity of a body of mass 0.5 kg, when it has a linear momentum of 5 Ns.

An electron of mass 9 × 10⁻³¹ kg is moving with a linear velocity of 6 × 10⁷ ms⁻¹. Calculate the linear momentum of electron.

A body of mass 200 g is moving with a velocity of 5 ms⁻¹. If the velocity of the body changes to 17 ms⁻¹, calculate the change in linear momentum of the body.

A motorcycle of mass 100 kg is running at 10 ms⁻¹. If its engine develops an extra linear momentum of 2000 Ns, calculate the new velocity of a motorcycle.

What do you understand by the term momentum?

State two factors which determine the momentum of a body.

Define Newton’s second law of motion.

Prove mathematically F = ma

Multiple Choice Question. Select the correct option.

The impulse of a body is equal to:

Multiple Choice Question. Select the correct option.

A force acts on a body of mass 3 kg such that its velocity changes from 4 ms⁻¹ to 10 ms⁻¹. The change in momentum of the body is

Multiple Choice Question. Select the correct option.

Which of the following are vector quantities?

ame the law of motion which gives the definition of force.

Name the physical entity used for quantifying the motion of a body.

What causes motion in a body?

What do you mean by linear momentum of a body?

Which of the following has the largest inertia?

Why is it advantageous to turn before taking a long jump?