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

A mass m₁ of a substance of specific heat capacity c₁ at temperature t₁ is mixed with a mass m₂ of other substance of specific heat capacity c₂ at a lower temperature t₂. Deduce the expression for the temperature t of the mixture. State the assumption made, if any.

Describe a method to determine the specific heat capacity of a solid, like a piece of copper ?

In an experiment to determine the specific heat capacity of a solid following operations were
made:
Mass of calorimeter + stirrer = x kg
Mass of water = y kg
Initial temperature of water t1℃
Mass of solid = z kg
Temperature of solid = t2 ℃
Temperature of mixture = t ℃
Specific heat capacity of calorimeter and water are c1 and c2 respectively. Express the specific
heat capacity c of the solid in terms of the above data.

A heater of power P watt raises the temperature of m kg of a liquid by Δt K in time t s. Express
the specific heat capacity of liquid in terms of above data.

The S.I. unit of specific heat capacity is ______.

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 ?