Condensation

Q.

3. When water is heated, it changes into steam. This process is known as:

1. Condensation

2. Evaporation

3. Freezing

4. Sublimation

Q.

Which method is used to separate tea leaves from the tea?

1. Sieving

2. Filtration

3. Decantation

Q.

Which one of the following does not undergo sublimation?

1. iodine

2. sodium chloride

3. ammonium chloride

4. None of these

Q. Dew drops found in the leaves of plants in cold mornings is due to ______.

1. sedimentation
2. filtration
3. evaporation
4. condensation

Q. Why do we need to separate different components of a mixture? Give two examples.​

Q. What causes you to feel cool after you start sweating?

1. Evaporation of sweat
2. Condensation of sweat
3. Freeezing of sweat
4. Infiltration of sweat

Q.

1.Differentiate between evaporation and condensation.

Q. A glass filled with ice cubes was kept on a table. After sometime water drops were observed on the outer wall of the glass. Which of following is true regarding this phenomenon?

1. This phenomenon is known as condensation.
2. This proves that water vapour is present in air.
3. This is also observed when a hot object is cooled in the open.
4. This phenomenon is known as evaporation.

Q.

Question 5

Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

Q.

Separation of coconut oil and water is done by-

1. Decantation
2. Filteration
3. Churning
4. Condensation

Q. The mopped floor dries up due to ___________.

1. sublimation
2. evaporation
3. condensation
4. sieving

Q.

Heterogenous mixtures can be separated into their respective constituents by simple physical methods. Identify such methods from the following.

1. Handpicking

2. Filtration

3. Sieving

4. Distillation

Q.

Water cycle is an example of interconversion of states of matter. Explain in short.

Q.

Write a short note on the factors that affect the process of evaporation.

Q. Water droplets on cold water glass is due to:

1. Evaporation
2. Transpiration
3. Condensation
4. Water Cycle

Q.

When we pour cold water in a glass after sometime we find droplet on the glass Same way when we take a glass from fridge with out water even then we find droplets on the glass why

Q.

Question 2 (e)

State for the following whether it is due to evaporation or condensation:
Steam rising from a hot girdle when water is sprinkled on it.

Q.

Take out a cooled bottle of water from the refrigerator and keep it on a table. After some time you notice droplets of water around it. Why?

Q. Dust particles present in air is an example of a solid-gas mixture.

1. True
2. False

Q. Water droplets are formed under the plate which is used to cover a cup of hot milk. This is due to ____ of water vapours.

1. filteration
2. condensation
3. solidification
4. decantation

Q.

Name the change of state during the following changes: Drying of wet clothes.

Q.

The following figure shows an irreversible change because:

1. Baked bread cannot be converted back to flour.

2. Baked bread on mixing with water can be converted back to flour.

3. Sometimes baked bread can be coverted back to flour and sometimes it cannot be.

4. No change is happening.

Q.

Blackboard dries up after wiping it with water. This is because of phenomenon X. The droplets on the outer surface of the cold glass are due to phenomenon Y. Which one of the following is correct?

1. X and Y are same phenomenon.

2. X and Y together results in water cycle.

3. X and Y both determines level of water on earth.

4. X and Y are chemical processes.

Q.

Cooling is caused during evaporation.

1. True
2. False

Q.

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Q. Fog appearing on a cold winter morning is due to a particular phenomenon. This phenomenon is also responsible for:

1. Drying up of clothes kept near heater.
2. Deposition of water droplets on the outer surface of a glass of cold water.
3. Drying up of lakes during summer.
4. Steam rising from wet clothes while they are ironed.

Q. Define intermolecular force of attraction?​

Q.

Evaporation cause ______ (cooling/ heating) of the surroundings.

Q.

Write short notes on:

Climbers

Q.

The greater the area of the exposed surface, the faster is the rate of evaporation.

1. True
2. False