Physics
Complete the following sentences:
- When ice melts, it's volume ……………
- Decrease in pressure over ice …………… it's melting point.
- Increase in pressure …………… the boiling point of water.
- A pressure cooker is based on the principle that boiling point of water increases with the ……………
- The boiling point of water is defined as ……………
- Water can be made to boil at 115°C by …………… pressure over it's surface.
Answer
- When ice melts, it's volume decreases.
- Decrease in pressure over ice increases its melting point.
- Increase in pressure increases the boiling point of water.
- A pressure cooker is based on the principle that boiling point of water increases with the increase in pressure
- The boiling point of water is defined as the constant temperature at which water changes to steam
- Water can be made to boil at 115°C by increasing pressure over it's surface.
Related Questions
Assertion (A): A desert becomes extremely hot in day time and very cold at night.
Reason (R): Sand has high specific heat capacity.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Write down the approximate range of temperature at which water boils in a pressure cooker.
(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 ?
- A
- B
- C
- D
(ii) Would you use this material for making a calorimeter? Give reason for your answer.
A substance on heating undergoes (i) a rise in it's temperature, (ii) a change in it's phase without change in it's temperature. In each case, state the change in energy of molecules of the substance.