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

Calculate the mass of ice required to lower the temperature of 300 g of water 40°C to water at 0°C.

(Specific latent heat of ice = 336 J/g, the Specific heat capacity of water = 4.2J/g°C)

What do you understand by the following statements:

The heat capacity of the body is 60JK^-1.

What do you understand by the following statements:

The specific heat capacity of lead is 130 Jkg^-1K^-1.

State two factors upon which the heat absorbed by a body depends

A boy uses the blue colour of light to find the refractive index of glass. He then repeats the experiment using the red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

A copper vessel of mass 100 g contains 150 g of water at 50°C. How much ice is needed to cool it to 5°C?

Given: Specific heat capacity of copper = 0.4 Jg^-1 °C^-1

The Specific heat capacity of water = 4.2 Jg^-1 °C^-1

The Specific latent heat of fusion ice = 336 Jg^-1

Name the waves used for echo depth sounding.

What property of water makes it an effective coolant?

Water in lakes and ponds do not freeze at once in cold countries. Give a reason is support of your answer.

A refrigerator converts 100 g of water at 20°C to ice at -10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.

Given: Specific heat capacity of ice = 2.1 J g^-1°C^-1

Specific heat capacity of water = 4.2 J g^-1°C^-1

Specific latent heat of fusion of ice = 336 J g^-1

50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.

Heat energy is supplied at a constant rate to 100g of ice at 0 °C. The ice is converted into water at 0° C in 2 minutes. How much time will be required to raise the temperature of water from 0 °C to 20 °C? [Given: sp. heat capacity of water = 4.2 J g^-1 °C^-1, sp. latent heat of ice = 336 J g^-1].

Specific heat capacity of substance A is 3.8 J g^-1K^-1 whereas the  specific heat capacity of substance B is 0.4 J g^-1 K^-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?

A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.

A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?

Heat supplied to a solid change it into liquid. What is this change in the phase called?

During the phase change does the average kinetic energy of the molecules of the substance increase?

Give a mathematical relation between Heat Capacity and Specific Heat Capacity.

The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.

Given: Specific heat capacity of water = 4200 J kg^-1 °C^-1 and specific latent heat of ice = 336000 J kg^-1.

The diagram shows a coil wound around a U-shaped soft iron bar AB.

1. What is the polarity induced at the ends A and B when the switch is pressed?
2. Suggest one way to strengthen the magnetic field in the electromagnet.
3. What will be the polarities at A and B if the direction of current is reversed in the circuit?