English Medium इयत्ता ९ - CBSE Question Bank Solutions for Science

Name the energy transfers which occur when someone speaks into a microphone.

Name the energy transfers which occur when there is a picture on a television screen.

Name the energy transfers which occur when a torch is on.

A ball falls to the ground as shown below :

 What is the kinetic energy of ball when it hits the ground?

A ball falls to the ground as shown below :

What is the potential energy of ball at B?

A ball falls to the ground as shown below :

Which law you have made use of in answering this question?

Give role of atmosphere in climatic control.

When an object falls freely towards the earth, then its total energy :

Which one of the following is not the unit of energy?

Which of the following energy change involves frictional force?

An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :

How much energy does a 100 W electric bulb transfer in 1 minute?

The device which converts mechanical energy into energy which runs our microwave oven is :

A microphone converts :

Demonstrate the formation of convective currents.

Set up an experiment to measure gain and loss of heat by water, sand and air.

Name the scientist who gave law of constant proportions.

Name the scientist who gave atomic theory of matter.

Which postulate of Dalton's atomic theory is the result of law of conservation of mass given by Lavoisier ?

Which part of the Dalton's atomic theory came from the law of constant proportions given by Proust ?