Effects of Pressure on State of Matter

Q.

Comment upon the following: rigidity.

Q.

What will happen to the boiling point of a liquid, when we increase the pressure:

1. Boiling point remains the same.

2. Boiling point increases.

3. Boiling point decreases

4. None of these

Q.

Give two reasons to justify:

An iron almirah is a solid at room temperature.

Q.

Rishi is surprised when he sees water boiling at $115°c$ in a container. Give reasons as to why water can boil at a higher temperature .

Q.

Ordinary water boils at ${100}^{0}C$. Can it be boiled at ${95}^{0}Cor{105}^{0}C$? Give reasons for your answer.

Q.

The melting point of the substances which contract on melting (like ice) decreases by the ______ in pressure.

1. Increase

2. None of these

3. Decrease

4. Increase or decrease

Q.

The boiling point of liquid decreases with _____ in pressure.

1. increase

2. remains unchanged

3. cannot be determined

4. decrease

Q. At which among the following altitude the boiling point of a substance is the lowest?

1. 10 m
2. 1500 m
3. 1000 m
4. 100 m

Q.

The boiling point of a liquid rises on increasing pressure. Give reason.

Q.

Question 7:

1. How does melting take place with a change in temperature?

2. What is the melting point of ice in oF?

Q. Glass will crack if it is suddenly heated or cooled, because of its ___________.

1. plasticity
2. transparency
3. density
4. bad conducting nature and high co-efficient of expansion

Q.

The melting point of the substances which contract on melting (like ice) decreases by the ______ in pressure.

1. Increase

2. Decrease

3. Increase or decrease

4. None of these

Q. 80gm of water at 30^oC is poured on a large block of ice at0^oC .The mass of ice that melts is ?

Q. Which of the following substances can be compressed?

1. Natural gas
2. Wood
3. Iron
4. Oxygen

Q. Identify an example of a liquid from the options given below.

1. Snow
2. Sea water
3. Water vapour
4. Nitrogen gas

Q.

Change in which of the following physical properties can transform matter from one state to another?

1. Temperature

2. Concentration

3. Pressure

4. Volume

Q.

In which of the following substances, the melting point increases with the increase in pressure.

1. Ice

2. Wax

3. Lead

4. Polythene

Q.

What state change happens at the liquefaction point?

1. Liquid changes into vapour

2. Solid changes into liquid

3. Gas changes into liquid

4. Liquid changes into solid