(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

The specific heat capacity of water is :

Find the time taken by a 500 W heater to raise the temperature of 50 kg of material of specific heat capacity 960 J kg^-1K^-1, from 18°C to 38° C. Assume that all the heat energy supplied by the heater is given to the material.

An electric heater of power 600 W raises the temperature of 4.0 kg of a liquid from 10.0℃ to 15.0℃ in100 s. Calculate:

1. the heat capacity of 4.0 kg of liquid,
2. the specific heat capacity of the liquid.

45 g of water at 50°C in a beaker is cooled when 50 g of copper at 18° C is added to it. The contents are stirred till a final constant temperature is reached. Calculate this final temperature. The specific heat capacity of copper is 0.39 J g^-1K^-1 and that of water is 4.2 J g^-1K^-1. State the assumption used.

Explain the term boiling ?

Explain the term boiling point ?

Ice cream appears colder to the mouth than water at 0℃. Give reason.

Why do bottled soft drinks get cooled, more quickly by the ice cubes than by the iced water, both at 0℃?

It is generally cold after a hail-storm then during and before the hail storm. Give reason.

How much heat energy is released when 5.0 g of water at 20℃ changes into ice at 0℃? Take specific heat capacity of water = 4.2 J g^-1 K^-1, Specific latent heat of fusion of ice = 336 J g^-1.

Explain the meaning of green house effect.

Name two green house gases ?

Name the radiations for which the green house gases are transparent ?

Name the radiations for which the green house gases are opaque ?

Name three fossil fuels that emit carbon dioxide into the atmosphere ?

How does green house effect help in keeping the temperature of earth’s surface suitable for living of human beings?

Give three reasons for the increase of green house gases.

State the effect of enhancement of green house effect.

What is meant by global warming?

State the impact of global warming on life on the earth.