ICSE ICSE Class 8 - CISCE Question Bank Solutions for Physics

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.

The unit in which we pay the cost of electricity is ..........

The electrical energy consumed in a house is measured by ...............

In a household electrical circuit, the appliance are connected in ............with the mains.

One kilowatt hour is equal to ............ joule.

One kilowatt is equal to

The purpose of an electric meter in a house is

If out of the two lighted bulbs in a room, one bulb suddenly fuses, then

From where does the electricity come to our home ?