A large bucket of water at 40 °C and a small cup of water at 80 °C are kept on a table. Which of them has higher heat content ?

1. The cup of water.
2. The bucket of water.
3. Both of them have an equal heat content.
4. Cannot be said without knowing the mass of the water in each.

Assertion (A): A desert becomes extremely hot in day time and very cold at night.

Reason (R): Sand has high specific heat capacity.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Complete the following sentences:

1. When ice melts, it's volume ……………
2. Decrease in pressure over ice …………… it's melting point.
3. Increase in pressure …………… the boiling point of water.
4. A pressure cooker is based on the principle that boiling point of water increases with the ……………
5. The boiling point of water is defined as ……………
6. Water can be made to boil at 115°C by …………… pressure over it's surface.

(i) Equal masses of four different substances are heated such that the rate of heat supply is same. The rise in temperature with respect to time is plotted on a graph. Which of the following substances has the highest specific heat capacity ?

1. A
2. B
3. C
4. D

(ii) Would you use this material for making a calorimeter? Give reason for your answer.