Vaporization and Evaporation

Q.

What is the difference between sensible heat and latent heat?

Q.

What is a septic tank? Where is it used?

Q.

A trickling filter is used in which of the following wastewater treatment processes

1. Primary treatment

2. Secondary aerobic treatment

3. Secondary anaerobic treatment

4. Tertiary treatment

5. All of the above

Q.

How is grit eliminated during primary treatment of sewage?

Q.

Describe various steps of cleaning wastewater in a wastewater treatment plant.

Q.

The water cycle is also known as the _______________ cycle.

Q.

4. Why does sea water not used for drinking and agricultural purpose?

Q.

Give reasons for the following:

Evaporation is faster in summer.

Q. Arrange the given processes involved in a correct sequence that is followed in a waste water treatment plant.

1. Screening
2. Grit removal
3. Sedimentation
4. Disinfection

Q.

Sodium chloride and sand is mixed in water. The resultant mixture is heated for a long time. What will be the end products of this process?

1. Sodium chloride and sand

2. Only sodium chloride

3. Only sand

4. Only sodium

Q.

State one difference between a gas and a vapour.

Q. Choose the change of state that occurs during evaporation.

1. Solid to Liquid
2. Liquid to Gas
3. Solid to Gas
4. Liquid to Solid

Q.

Water covers about 70 percent of earths surface.

1. True
2. False

Q.

The process of water seepage into the ground is called _________.

Q. Describe the steps involved in getting clarified water from wastewater.

Q.

Water present in the air is also known as:

1. Moisture

2. Vapour

3. Ice

4. Drinking water

Q. On what factors does evaporation of a liquid depend?

1. The velocity of the wind
2. The temperature of the surroundings
3. The surface area of liquid exposed
4. The humidity of the surroundings

Q.

The rate of evaporation increases with:

1. An increase in wind speed

2. Increase in temperature

3. All the options are correct

4. Increase in surface area

Q. Match the following correctly. [3 MARKS]

$\begin{array}{cc}a)Cleaningofwaterisaprocessof& i)sewagetreatmentplant\\ b)Wastewaterreleasedbyhousesiscalled& ii)removingpollutants\\ c)Driedsludgeisusedas& iii)lowcostdisposalsystems\\ d)Drainsgetblockedby& iv)manure\\ e)Wastewateristreatedin& v)sewage\\ f)Septictanks,chemicaltoilets,compostingpitsareexamplesof& vi)cookingoilsandfats\end{array}$

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Q. State whether given statement is True or False
The degree of hotness or coldness of any substance is called Temperature?

1. True
2. False

Q. In evaporation, ______ and in vaporization, _______.

1. gas is converted into liquid, gas is converted into liquid
2. gas is converted into liquid, liquid is converted into gas
3. liquid is converted into gas, liquid is converted in gas
4. liquid is converted into gas, gas is converted into liquid

Q. State the basic difference between a gas and a vapour.

Q. The process of a liquid changing into vapour even below its boiling point is called ___________.

Q. We feel comfortable in fan because

1. it gives us cool air
2. it evaporates water from our body
3. our body radiates more heat due to air of fan
4. none of these

Q. Give an example to explain that evaporation is a cooling process.

Q. Which of the following are differences between evaporation and vaporisation?

1. Evaporation occurs at all temperatures but vaporisation occurs at fixed temperature only
2. Evaporation is a slow and gradual process whereas vaporisation is a rapid and violent process
3. Evaporation takes place only at the surface of the liquid whereas vaporization takes place over the entire liquid
4. Evaporation happens all the time in a day whereas vaporization happens only once a day

Q. When standing near boiling water, you feel

1. Cold
2. Dry
3. None of the above
4. Hot

Q. When the temperature of water rises, the rate of evaporation will

1. increase
2. decrease
3. remain the same
4. first decrease then increase

Q. During evaporation, the state of a substance changes from:

1. solid to liquid
2. liquid to gas
3. gas to solid
4. solid to gas

Q. Where does evaporation takes place?

1. On surface of liquid
2. Through out the liquid
3. Inside the liquid
4. None