Water Treatment

Q. Give any five ways to conserve the water.

Q. Which of the following gases is used to disinfect water?

1. Carbon dioxide
2. Oxygen
3. Chlorine
4. Water vapour

Q.

Describe the steps involved in the purification of drinking water for the city water supply.

Q. The process of passing chlorine gas through water to kill germs is known as ________.

1. sedimentation
2. chlorination
3. screening
4. filtration

Q. is the process in which impurities in water like sand or pebbles settle down at the bottom of container.

1. Sedimentation
2. Screening
3. Filtration

Q.

Write a short note on the process of sedimentation and decantation.

Q.

Why is public cleanliness important for individual health?

Q. What can be done to clean water bodies?

1. Treatment of industrial waste before dumping
2. Treatment of sewage waste before dumping
3. Throwing garbage in water bodies
4. Washing clothes in water bodies

Q.

Chlorine gas is added to clear water, to kill germs and bacteria.

1. True
2. False

Q. Chlorination can be used to purify water for drinking.

1. True
2. False

Q. Which of the following chemical is used to disinfect water in a wastewater treatment plant?

1. Oxygen
2. Chlorine
3. Hydrogen
4. Carbon dioxide

Q. Why is chlorine gas passed through water during treatment process?

1. To kill germs
2. To add nutrients
3. To remove dirt
4. To settle down sand particles

Q. Dumping of untreated industrial waste into water bodies make water bodies _____.

1. highly polluted
2. fit for consumption
3. sweet in taste
4. clean and clear

Q.

The process of polluting water by dumping garbage and wastes is known as:

1. Water pollution

2. Water purification

3. Precipitation
4. Sedimentation

Q.

The pollution which affects the aquatic life is

1. Air pollution

2. Water pollution

3. Noise pollution

4. Soil pollution

Q.

Alum increases the rate of sedimentation. Why?

Q. What should we do to conserve water?

1. Turn off the tap while brushing.
2. Use a bucket while bathing.
3. Use washing machine regularly.
4. Fix the leaking tap.

Q.

Jaundice may be caused by retarded function of

1. Lungs

2. Kidneys

3. Heart

4. Liver

Q. Which of the following methods are part of water purification process?

1. Sedimentation
2. Filteration
3. Chlorination
4. Condensation

Q. The process of passing chlorine through dirty water to kill germs is known as ____________.

1. screening
2. sedimentation
3. chlorination
4. filtration

Q.

Which instrument is used to remove floatable solids from the wastewater?

Q.

Explain the following terms.

Sedimentation

Q. Which of the following is removed using a scraper during wastewater treatment?

1. Grease
2. Plastic
3. Oil
4. Sludge

Q. Why do you think there was no water in the bathroom of the train? Discuss.

Q. Sedimentation is useful for:

1. Water purification.
2. Cottage cheese formation.
3. Separation of husk from grains.
4. Separation of water from milk.

Q. How do water pollution causes eutrophication .
b) List two activities of man which lead to environment pollution.

Q. Which of the following methods are part of water purification process?

Note: This question has more than one answer.

1. Chlorination
2. Condensation
3. Sedimentation
4. Filteration

Q. Water pollution ______ aquatic life.

1. does not affect
2. benefits
3. harms
4. nourishes

Q. how water gets dirty?

Q. Select the activity which does not pollute river water.

1. Washing clothes
2. Washing animals
3. Throwing garbage
4. Collecting water