Condensation

Q. Why does evaporation cause cooling?

Q. What is the effect of humidity on evaporation?

Q. Why do wet clothes dry quickly in the sun than in the shade?

Q.

Water is present in the air in the form of water vapour.

1. True

2. False

Q. Explain how the rate of evaporation of a liquid is affected with: 1) Increase in temperature of the liquid.
2) Decrease in exposed surface area.
3) Increase in moisture in the surrounding air.
4) Increase in wind speed.

Q. When it rains, the car's windshield gets blurred due to ______ phenomenon.

1. evaporation
2. condensation
3. freezing
4. solidification

Q. State three differences between evaporation and boiling.

Q. Copper sulphate when heated becomes colourless.give reason

Q.
Look at the following figures and suggest in which of the glass containers, i.e., A, B, C or D, the rate of evaporation will be the highest? Explain

Q. Water and alcohol are easily separated by distillation because of the difference in their ___ .

1. melting point
2. boiling point
3. density
4. colour

Q.

Will an increase or decrease in pressure help to liquefy a gas?

Q.

Suppose we take some water in a container and seal it. Now we place it on a heater, the water starts boiling and converts into vapour. Now if we allow the container to cool down for some time and then open seal. The amount of water we get:

1. Will be more than the initial amount

2. Can’t be said

3. Will be less than the initial amount

4. Will be equal to the initial amount

Q.

The picture below shows the change in two states of matter. Identify the process 'X', by which gas is converted to liquid.

1. Solidification
2. Condensation
3. Melting
4. Freezing

Q. Which of the following processes correspond to a chemical change?

1. Galvanisation of an iron door​
2. Formation of a bluish-green coat over a copper vessel
3. Crystallisation of copper sulphate
4. Blowing off a fuse

Q. Why do solids, liquids and gases differ in their physical states?

Q. How is evaporation similar to transpiration?

1. They both are a part of the water cycle
2. They both occur only in summer
3. They both occur only in plants
4. They both do not get affected by humidity

Q. Evaporation is the process by which a liquid changes into vapour, by absorbing heat.

1. True
2. False

Q. What are the different conditions for a chemical reaction to take place?

1. Close contact
2. Solution form
3. Light
4. Heat
5. All of these

Q. Which of the following process is involved in the conversion of water vapour into water droplets?

1. Evaporation
2. Boiling
3. Solidification
4. Condensation

Q. Identify the method by which chalk powder and water can be separated.

1. Filtration
2. Sedimentation
3. Threshing
4. Winnowing

Q. Condensation results in the formation of ______.

1. gases from liquids
2. solids from liquids
3. liquids from gases
4. solids from gases

Q. When it rains, the car's windshield gets blurred due to ______ phenomenon.

1. evaporation
2. solidification
3. freezing
4. condensation

Q. Define:​
Evaporation​

Q.

Water vapour that condenses and falls down as rain is formed due to ___ of water from water bodies.

Q. During winter season, presence of dew drops on leaves is a common site in gardens. During the formation of these dew drops, water changes its state from to .


a) gaseous, liquid
b) gaseous, solid
c) liquid, solid
d) liquid, gaseous

Q. What kind of change is the curding of milk?

Q.

Conversion of water into water vapour during evaporation is a

1. No change

2. Cannot be determined

3. Physical change

4. Chemical change

Q. How does evaporation differ from boiling?

Q. Making of omelette from egg is a/an _____ change.

1. periodic
2. irreversible
3. reversible
4. temporary

Q. Which of the following occurs due to condensation?

1. Mirror in a bathroom turning foggy during a hot shower.
2. Drying up of a wet black board.
3. Steam rising from wet clothes when they are ironed.
4. Drying of wet clothes hanging on a rope.