ICSE ICSE Class 7 - CISCE Question Bank Solutions for Physics

Name a solid which is a good conductor of heat.

Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.

Why do we use cooking utensils made up of copper.

Why is a tea kettle provided with an ebonite handle?

In summer, ice is kept wrapped in a gunny bag. Explain the reason.

Why is an oven made of double walls with the space in between filled with cork ?

Explain why  we wear woolen clothes in winter.

Explain why  the water pipes are covered with cotton during very cold weather.

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.