Explore topic-wise MCQs in Waste Water Engineering.

This section includes 118 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.

101.

Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?

A. Chlorination
B. Treating with potassium permagnate
C. UV radiation
D. Treating with bleaching powder
Answer» D. Treating with bleaching powder
Discussion
102.

BOD stands for

A. biochemical oxygen demand
B. british oxygen demand
C. british oxygen depletion
D. biological oxygen depletion
Answer» B. british oxygen demand
Discussion
103.

According to BIS the maximum permissible limit of dissolved solids in drinking water is

A. 1000 mg/l
B. 500 mg/l
C. 2000 mg/l
D. 1500 mg/l
Answer» D. 1500 mg/l
Discussion
104.

Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as

A. insoluble carbonates
B. insoluble zeolites
C. insoluble chlorides
D. insoluble sulfates
Answer» C. insoluble chlorides
Discussion
105.

Which of the following substances are commonly used in a filter?

A. Charcoal
B. Sand
C. Both (a) and (b)
D. Aluminum chloride
Answer» D. Aluminum chloride
Discussion
106.

Sanitizers used for rubber made equipments are

A. strong acids
B. strong alkalis
C. combination of both
D. none of these
Answer» C. combination of both
Discussion
107.

Conventional tertiary treatment is

A. chemical coagulation and flocculation
B. filtration
C. sedimentation
D. none of these
Answer» B. filtration
Discussion
108.

Zeolite softening process removes

A. only temporary hardness of water
B. only permanent hardness of water
C. both temporary and permanent hardness of water
D. the dissolved gases in permanent hard water
Answer» D. the dissolved gases in permanent hard water
Discussion
109.

The chemical oxygen demand (COD)measures the

A. amount of oxygen required for growth of microorganisms in water
B. amount of oxygen that would be removed from the water in order to oxidize pollution
C. amount of oxygen required to oxidize the calcium present in waste water
D. none of the above
Answer» C. amount of oxygen required to oxidize the calcium present in waste water
Discussion
110.

The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is

A. 0.05 mg/l
B. 0.09 mg/l
C. 0.1 mg/l
D. 1.0 mg/l
Answer» B. 0.09 mg/l
Discussion
111.

The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is

A. 600 ppm
B. 300 ppm
C. 500 ppm
D. 1000 ppm
Answer» C. 500 ppm
Discussion
112.

Physical adsorption ________ with increase in temperature?

A. Decreases
B. Increases
C. Remains same
D. Fluctuates
Answer» B. Increases
Discussion
113.

Chemical adsorption is also called as _____

A. Sorption
B. Chemisorption
C. Chemiption
D. Chemical sorption
Answer» C. Chemiption
Discussion
114.

Physical adsorption is also called as _________

A. Adsorption
B. Absorption
C. Physisorption
D. Sorption
Answer» D. Sorption
Discussion
115.

What is the lowest enthalpy of adsorption for physical adsorption?

A. 5 KJ mol<sup>-1</sup>
B. 10 KJ mol<sup>-1</sup>
C. 15 KJ mol<sup>-1</sup>
D. 25 KJ mol<sup>-1</sup>
Answer» C. 15 KJ mol<sup>-1</sup>
Discussion
116.

Which force holds the molecules in physical adsorption?

A. Friction force
B. Van der waals force
C. Tension force
D. Nuclear force
Answer» C. Tension force
Discussion
117.

Chemical adsorption takes place at high temperature.

A. True
B. False
Answer» B. False
Discussion
118.

Adsorption is an endothermic process.

A. True
B. False
Answer» C.
Discussion