Factors Affecting Evaporation

Q.

What are the factors affecting evaporation?

Q.

Why are we able to sip hot tea or milk faster from a saucer rather than from a cup?

Q. Comment on the following statements.

a. Evaporation produces cooling.
b. Rate of evaporation of an aqueous solution decreases with an increase in the humidity.
c. Sponge though compressible is a solid.

Q.

Evaporation is a surface phenomenon.

1. True

2. False

Q. Which of the following does not affect the rate of evaporation?

1. Wind speed
2. Surface area
3. Temperature
4. Insoluble heavy impurities

Q.

Why do we sweat in humidity?

Q.

Which of the following does not affect the rate of evaporation?

1. wind speed

2. temperature

3. surface area

4. insoluble heavy impurities

Q.

Why acetone evaporate faster than water of same amount?

Q.

will increase of surface area, increase or decrease rate of evaporation

Q.

Evaporation is a bulk phenomenon.

1. True

2. False

Q.

Wet clothes dry quickly under sun than in shade. Explain

Q.

We use a ___________ for evaporating liquid matter. (trough/ china dish)

Q.

Question 1
Why does a desert cooler cool better on a hot dry day?

Q.

5 ml of water was taken in a china dish and a test tube separately. These samples were then kept under different conditions as below:

1. Both samples were kept under a fan
2. Both samples were kept inside a cupboard.

State in which case the evaporation will be faster. Give a reason to support your answer.

Q. The evaporation of a liquid can best be carried out in :

1. 
2. 
3. 
4. 

Q.

Explain an activity to show the factors affecting evaporation.

Q.

The evaporation from the surface of any liquid depends on:

1. Temperature
2. wind speed
3. Humdity
4. Nature of liquid

Q. The rate of evaporation is inversely proportional to the humidity in the atmosphere.

1. False
2. True

Q.

What happens to the rate of evaporation when salt is added to the water?

Q.

Which of the following factors increases the rate of evaporation?

1. Increase in surface area
2. Increase in temperature
3. An increase in wind speed
4. An increase in humidity

Q.

Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Q. 1L of water is kept in 4 different bowls having surface areas as 50 $m^2$, 100 $m^2$, 150 $m^2$, 200 $m^2$ respectively. Arrange the surface areas in the increasing order of rate of evaporation.

1. $100m^2$ < $150m^2$ < $200m^2$ < $50m^2$
2. $50m^2$ < $200m^2$ < $150m^2$ < $100m^2$
3. $50m^2$ < $150m^2$ < $200m^2$ < $100m^2$
4. $50m^2$ < $100m^2$ < $150m^2$ < $200m^2$

Q.

The evaporation of water increases under the following conditions :

(a) increase in temperature, decrease in surface area

(b) increase in surface area, decrease in temperature

(c) increase in surface area, rise in temperature

(d) increase in temperature, increase in surface area, addition of common salt

Q.

Which of the following affect evaporation?

1. Humidity

2. Nature of the liquid

3. All the options are correct.

4. Surface area exposed to the atmosphere.

Q.

Why does a desert cooler cool better on a hot dry day?

Q.

Why does a desert cooler cool better on a hot and dry day?

Q. Assertion :A desert cooler cools better on a hot dry day. Reason: On a hot dry day, the temperature is high and humidity is low. The water takes heat from the hot desert cooler and evaporates. The evaporation of water cools the pads and the circulating water.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Evaporation occurs only at ______ of a liquid.

Q.

Can the intermixing of two solids be termed diffusion? Comment.

Q.

Equal amount of tea is kept in the cup and saucer. The tea cools faster when placed in a saucer than in a cup. This phenomenon shows that rate of evaporation depends on:

1. Humidity

2. Surface area

3. Color of utensil

4. Temperature