Water Treatment Plant

Q.

Why lime is added during coagulation step of water treatment?

1. It adds colour to the water.

2. It adds taste to water.

3. It increases the pH.

4. It decreases the pH.

Q.

What is the pH of normal rainwater?

Q.

Why the pages in new books look white while those in older books turn yellow?

1. The paper contains tiny amounts of base.

2. None of these.

3. The paper contains tiny amounts of acid.

4. The paper contains tiny amounts of alkali.

Q.

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

Filtration, Coagulation, Chlorination, Aeration.

1. Aeration, Coagulation, Chlorination, Filtration.

2. Coagulation, Chlorination, Aeration, Filtration.

3. Filtration, Coagulation, Aeration, Chlorination.

4. Aeration, Filtration, Coagulation, Chlorination.

Q.

Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her. [Alum, tub, muslin cloth, gas stove, thread, pan and lid.]

Q.

During water treatment, in which of the following water sample will you add lime?

1. pH 7

2. pH 8

3. pH 10

4. pH 5

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

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

Q.

The process of removal of ___________ (salt/plastic wastes) from seawater is called desalination.

Q. pH of the following solutions is not affected by dilution A. 0.01M CH3COONa B. 0.01M NaHCO3 C. Buffer of 0.01M CH3COONa and 0.01M CH3COOH D. 0.01M CH3COONH4

Q. How many litres of water has evaporatedon concentrating 10 litres of H2S04 such that its pH decreases from 6 to 5?

Q.

During which step of wastewater treatment sterilization of water occurs?

1. Aeration

2. Coagulation

3. Clariflocculation

4. Chlorination

Q.

During the first step of wastewater treatment

1. Amount of chlorine is decreased.

2. Amount of chlorine is increased.

3. Amount of oxygen is decreased.

4. Amount of oxygen is increased.

Q.

Which of the following substance is added during water treatment?

1. Washing soda

2. Washing powder

3. Bleaching powder

4. Baking soda

Q.

What happens during the aeration step of water treatment?

1. Amount of oxygen decreases

2. Amount of oxygen increases

3. Amount of chlorine decreases

4. Amount of chlorine increases

Q.

Which substance is added to the water treatment tank during coagulation?

1. Alum

2. Chlorine

3. Bleaching powder

4. Oxygen

Q.

Which of the following is a common method used to purify water for drinking?

1. Chlorination

2. Condensation

3. Filtration

4. Evaporation

Q.

Sedimentation of solid matter occurs during which step of water treatment?

1. Coagulation

2. Chlorination

3. Clariflocculation

4. Aeration

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

1. Screening
2. Filtration
3. Sedimentation