ICSE ICSE Class 7 - CISCE Question Bank Solutions

Select the correct alternative

If we add a lump of ice to a tumbler containing water,

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Heat in a liquid is transferred by

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In the process of convection, heat travel

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The vacuum kept in between the walls of a thermos flask reduces the heat transfer by

Fill in the blank.

The sound heard after reflection is _______

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The minimum distance required between the source and the reflector so as to hear the echo in air is

State the direction of heat transfer by way of convection.

The outer case of the bell in a temple is made big. Give a reason.

Why is the freezing chest in a refrigerator fitted near its top?

Explain briefly the process of heat transfer by radiation.

Give one example of heat transfer by radiation.

What do you mean by reflection of sound ?

State one use of reflection of sound.

What is echo ?

Write true or false of the following statement.

The speed of light in vacuum is 3 × 10⁸ ms^-1.

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The speed of light is maximum in

State the speed of light in (a) air, (b) glass.

State whether light slows down or speeds up in the following cases :

 Light going from air to glass.

State whether light slows down or speeds up in the following cases :

Light going from glass to water.

State whether light slows down or speeds up in the following cases :

Light going from water to air.