Evaporation

Q.

The boiling point of liquid increases with increase in pressure.

1. True

2. False

Q.

Difference between boiling and vaporization.

Q.

Does higher vapour pressure mean faster evaporation?

Q.

A pressure cooker is based on the principle that boiling point of water increases with the_______.

1. Increase in temperature

2. Increase in volume

3. Increase in pressure

4. Decrease in pressure

Q.

Evaporation of material takes place

1. above its boiling point

2. above its melting point

3. below its boiling point

4. below its melting point

Q. What is latent heat? What are its types?

Q. Which amongst the following statements is true about evaporation?

1. It is a surface phenomenon.
2. It is a bulk phenomenon.
3. The molecules undergoing evaporation lose their kinetic energy.
4. The molecules undergoing evaporation gain kinetic energy.

Q. State how the velocity-time graph can be used to find the distance travelled by the body in a given time.

Q.

The thermal capacity will increase if we make the base of the cooking pan thick.

1. True

2. False

Q. Which of these actions will enhance the rate of evaporation of water?

1. Blowing wind over the surface of water.
2. Providing more heat to the water.
3. Increasing the water's surface area of contact with air.
4. Covering it completely with a lid.

Q.

Distinguish between evaporation and boiling.

Q.

No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapour?

Q.

If the velocity-time graph is a straight line parallel to time axis for a body, then the body is having _____.

1. uniform accelerated motion

2. non-uniform accelerated motion

3. non-uniform motion

4. uniform velocity motion

Q.

Explain: Evaporation causes cooling