ICSE ICSE Class 8 - CISCE Question Bank Solutions

State the energy changes in the following while in use An electric oven.

State the energy changes in the following while in use A loudspeaker .

State the energy changes in the following while using a microphone.

State the energy changes in the following while using an electric motor.

When white light passes through a prism, it ............

The splitting of white light into its constituent colours is called .............

The speed of light in air or vacuum is

A ray of light moving from an optically rarer to a denser medium

The property of splitting of white light into its seven constituent colours is known as

The seven colours in the spectrum of sunlight in order, are represented as :

State the speed of light in (a) air, (b) water, and (c) glass

How does the speed of light determine the optical density of a medium?

Which is optically denser: water or air? Give reason

Out of air and glass, which is optically rarer? Give reason.

A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.

In figure AO is the ray of white light falling on a prism PQR. Complete the diagram till the light emerges out from the prism and falls on the screen.

What do you understand by the term spectrum? Name the various colours present in the spectrum of sunlight.

You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its colour when it is rotated rapidly?

S.I. unit and commercial unit of electrical energy are same.

All electrical appliances in a household circuit work at the same voltage.