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Water Softening and Treatment Methods Online Exam Quiz

Important questions about Water Softening and Treatment Methods. Water Softening and Treatment Methods MCQ questions with answers. Water Softening and Treatment Methods exam questions and answers for students and interviews.

In which unit operation, gases are released or absorbed in the water?

Options

A : a. Gas transfer

B : b. Ion transfer

C : c. Solute stabilization

D : d. Solids Transfer

How many types of aerators are commonly used in the treatment of water?

Options

A : a. 2

B : b. 3

C : c. 4

D : d. 5

Which of the following process is used to remove the colloidal particles from water?

Options

A : a. Chemical precipitation

B : b. Chemical coagulation

C : c. Ion exchange

D : d. Adsorption

Flocculation of iron from water by the addition of lime is an example of which of the following process?

Options

A : a. Chemical precipitation

B : b. Chemical coagulation

C : c. Ion exchange

D : d. Adsorption

In which unit operation objectionable solutes are converted into unobjectionable forms without removal?

Options

A : a. Gas transfer

B : b. Ion transfer

C : c. Solute stabilization

D : d. Solids Transfer

In which form of solute stabilization, hydrogen sulfide in water is oxidized into sulfate?

Options

A : a. Chlorination

B : b. Liming

C : c. Re-carbonation

D : d. Super-chlorination

Which form of solute stabilization occurs when water passes through limestone?

Options

A : a. Chlorination

B : b. Liming

C : c. Re-carbonation

D : d. Super-chlorination

In which process, excess lime is converted into bicarbonate?

Options

A : a. Chlorination

B : b. Liming

C : c. Re-carbonation

D : d. Super-chlorination

By which process, odour producing substances is oxidized?

Options

A : a. Chlorination

B : b. Liming

C : c. Re-carbonation

D : d. Super-chlorination

Solids are removed from the water by which of the following unit operation?

Options

A : a. Inter facial contact

B : b. Solid stabilization

C : c. Ion transfer

D : d. Solids transfer

Dealkalization results in removal of all the ions from the water.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

Organic contaminants are removed from the water by the process of ______

Options

A : a. Water softening

B : b. Demineralization

C : c. Absorption

D : d. Adsorption

Which process of water treatment is done to avoid floating debris, branches, trees or other large particles suspended in water?

Options

A : a. Screening

B : b. Aeration

C : c. Primary sedimentation

D : d. Secondary sedimentation

What is the size of the coarse screen used in pretreatment of water?

Options

A : a. 25mm

B : b. 50mm

C : c. 75mm

D : d. 100mm

The coarse screen is inclined at _____ to facilitate the cleaning or raking.

Options

A : a. 300

B : b. 350

C : c. 450

D : d. 900

The head loss through screen depends on _______________

Options

A : a. Shape of screen elements

B : b. Open area, block area

C : c. Approach velocity

D : d. Nature of their construction, approach velocity

The shape factor for circular rods in finding the head loss through the screen is _____

Options

A : a. 1.79

B : b. 2.42

C : c. 1.83

D : d. 1.45

Micro strainers are used to remove color in water.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

Identify the incorrect statement regarding aeration process.

Options

A : a. It removes taste and odor

B : b. It increases the dissolved oxygen content of water

C : c. It increases the carbon dioxide content of water

D : d. It is used for mixing chemicals with water

The reduction of carbon dioxide by cascade aerators is in the range of __________

Options

A : a. 10-20%

B : b. 20-30%

C : c. 40-50%

D : d. 50-60%

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