Purification of Water

Q.

What is water scarcity and what are its main causes?

Q.

What is the difference between filtration and sedimentation?

Q.

In the waste treatment plant (WWTP) air is pumped into water to:

1. Support the growth of anaerobic bacteria

2. Support the growth of aerobic bacteria

3. Blow human waste

4. Disinfect water

Q.

___ is the action of purifying a liquid by a process of heating and cooling.

Q. Identify the laboratory apparatus shown in the image below:

1. Round bottom flask
2. Flat bottom flask
3. Beaker
4. Burette

Q.

23 Write one purpose of separating substance from a mixture?

Q. Water fit for drinking is known as _______ water.

1. portable
2. potable
3. safe
4. clean

Q.

Boiling kills most of the_________ in water.

Q.

What is alum used for?

Q.

Carbogen is a mixture of _____ % Oxygen and _____ % Carbon dioxide.

1. $5,95$

2. $90,10$

3. $95,5$

4. $10,90$

Q. Consider the following treatment steps in a conventional wastewater treatment plant:
1. Loading and sedimentation
2. Chlorination or ozonization
3. Aeration
4. Filtration
The correct sequence of these steps is

1. 2-1-4-3
2. 1-4-3-2
3. 3-1-4-2
4. 1-2-4-3

Q.

In the waste water treatment plant (WWTP) air is pumped into water to:

1. Support the growth of anaerobic bacteria

2. Support the growth of aerobic bacteria

3. Disinfect water

4. Blow human waste

Q.

Which of the following procedures can be used to obtain water which is free from impurities?

1. Distillation

2. Boiling

3. Filtration

4. Adding chlorine tablet

Q. ___ is the action of purifying a liquid by a process of heating and cooling.

Q.

how to seperate water from sand by filteration

Q. Match the items in column I to those in column II.

Column I	Column II
i. distillation	A. lead
ii. pollutant	B. saline
iii. potable	C. pure water
iv. seawater	D. drinkable

Which set of answers is correct?
(a) i-A; ii-C; iii-B; iv-D
(b) i-A; ii-C; iii-D; iv-B
(c) i-C; ii-A; iii-B; iv-D
(d) i-C; ii-A; iii-D; iv-B

Q. Boiling helps in ____ harmful microorganisms in water.

1. spreading
2. growing
3. nourishing
4. killing

Q. tank is used in purification of water, to remove heavy solid impurities by allowing them to settle down at the bottom.

1. Sedimentation
2. Loading
3. Filtration

Q. Why does mustard oil not mix well with water?

Q.

What is the process for wastewater treatment called?

1. Sewage treatment

2. Chlorination

3. Filtration

4. Water treatment

Q.

Water treatment plant is a must for industries generating sewage.

1. True
2. False

Q. Arrange the following steps of water treatment in the way they occur in a water treatment plant.

1. Sedimentation
2. Loading
3. Filtration
4. Chlorination

Q. Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

1. Only (ii) and (iii) are correct
2. Only (i) and (ii) are correct
3. (i), (ii) and (iii), all are correct
4. Only (i) and (iii) are correct

Q.

Identify the name of the process that is used to obtain pure water for industrial purpose.

1. Filtration

2. Distillation

3. Boiling

4. Chlorination

Q.

In the treatment of water, solid impurities are allowed to settle to the bottom. This particular stage in the entire purification is called ___

1. Distillation

2. Chlorination

3. Sedimentation

4. Sublimation

Q.

for what is the beaker used