ICSE ICSE Class 7 - CISCE Question Bank Solutions

Why are quilts filled with fluffy cotton?

Why is a ventilator provided in a room?

Why are chimneys provided over furnace in factories?

What are the land and sea breezes? Explain their formation.

Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?

The bottom of a cooking utensil is painted black. Give the reason.

You are required to take out 200 ml of milk from a bucket full of milk. How will you do it?

Write the density of water at 4°C.

The mass of 5 litre of water is 5 kg. Find the density of water in g cm^-3.

A cubical tank of side 1 m is filled with 800 kg of a liquid. Find:
(i) the volume of tank,
(ii) the density of liquid in kg m^-3.

Fill in the blank

Green plants convert _________ energy into chemical energy.

Write true or false of the following statement.

When a light ray is reflected from a wall, the angle of incidence is not equal to the angle of reflection.

Fill in the blank

The image formed by a plane mirror is erect and _____

State the energy changes that occur in the following :

The unwinding of a watch spring.

State the energy changes that occur in the following :

Burning coal while operating a steam engine.

State the energy changes that occur in the following :

Lighting of a torch bulb.

State the energy changes that occur in the following :

An electric generator (or dynamo).

Fill in the blank

A ________ image cannot be obtained on a screen.

 Select the correct alternative

The angle between the incident ray and the ray reflected from the plane mirror is 70°. The angle of incidence will be :

Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.