Explore topic-wise MCQs in Environmental Engineering.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following statement is wrong regarding Iron salt?

A. Iron salt produces less floc than Alum
B. Detention time for sedimentation by using Iron salt as coagulant is less
C. Handling of Iron salt requires some skills
D. Iron removes H2S, taste and odor
Answer» B. Detention time for sedimentation by using Iron salt as coagulant is less
Discussion
2.

Why Magnesium carbonate is not commonly preferred as coagulant?

A. It is expensive
B. It does not remove color
C. Formation of sludge
D. The time required for floc formation is less
Answer» D. The time required for floc formation is less
Discussion
3.

Ferric chloride is effective over a pH range of __________

A. 3.5-6
B. 6.5-8
C. 3.5-6.5
D. 2-5
Answer» D. 2-5
Discussion
4.

The chemical composition of Chlorinated Copperas is __________

A. Fe2 (SO4)3 + FeCl3
B. FeSO4.9H2O
C. FeSO4.18H2O
D. Fe2 (SO4)3
Answer» B. FeSO4.9H2O
Discussion
5.

The chemical compound which is insoluble in water, formed when alum is added to water is _____________

A. Al (OH)3
B. CaSO4
C. CO2
D. Ca (OH)3
Answer» B. CaSO4
Discussion
6.

The chemical composition of Alum is _____________

A. Al2 (SO4)3.18H2O
B. Al2 (SO4)2.18H2O
C. Al3 (SO4)2.18H2O
D. Al4 (SO4)3.18H2O
Answer» B. Al2 (SO4)2.18H2O
Discussion
7.

FERRIC_CHLORIDE_IS_EFFECTIVE_OVER_A_PH_RANGE_OF?$

A. 3.5-6
B. 6.5-8
C. 3.5-6.5
D. 2-5
Answer» D. 2-5
Discussion
8.

Which of the following statement is wrong regarding Iron salt?$

A. Iron salt produces less floc than Alum
B. Detention time for sedimentation by using Iron salt as coagulant is less
C. Handling of Iron salt requires some skills
D. Iron removes H<sub>2</sub>S, taste and odor
Answer» B. Detention time for sedimentation by using Iron salt as coagulant is less
Discussion
9.

Why_Magnesium_carbonate_is_not_commonly_preferred_as_coagulant?$

A. It is expensive
B. It does not remove color
C. Formation of sludge
D. The time required for floc formation is less
Answer» D. The time required for floc formation is less
Discussion
10.

The chemical composition of Chlorinated Copperas i?

A. Fe<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub> + FeCl<sub>3</sub>
B. FeSO<sub>4</sub>.9H<sub>2</sub>O
C. FeSO<sub>4</sub>.18H<sub>2</sub>O
D. Fe<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub>
Answer» B. FeSO<sub>4</sub>.9H<sub>2</sub>O
Discussion
11.

Why Alum is preferred over other coagulants?

A. It is easy to dewater the sludge formed
B. It imparts corrosiveness to water
C. It reduces taste and odor in addition to turbidity
D. The time required for floc formation is less
Answer» D. The time required for floc formation is less
Discussion
12.

Alum is effective when pH of water is between ____

A. 8-10
B. 6-8
C. 6.5-8.5
D. 7-9
Answer» D. 7-9
Discussion
13.

What indicates the permanent hardness when alum is added to water?

A. Al (OH)<sub>3</sub>
B. CaSO<sub>4</sub>
C. CO<sub>2</sub>
D. Ca (OH)<sub>3</sub>
Answer» C. CO<sub>2</sub>
Discussion
14.

Which gas is released when alum is added to water?

A. Al (OH)<sub>3</sub>
B. CaSO<sub>4</sub>
C. CO<sub>2</sub>
D. Ca (OH)<sub>3</sub>
Answer» D. Ca (OH)<sub>3</sub>
Discussion
15.

The chemical compound which is insoluble in water, formed when alum is added to water is _____

A. Al (OH)<sub>3</sub>
B. CaSO<sub>4</sub>
C. CO<sub>2</sub>
D. Ca (OH)<sub>3</sub>
Answer» B. CaSO<sub>4</sub>
Discussion
16.

The chemical composition of Alum is

A. Al<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub>.18H<sub>2</sub>O
B. Al<sub>2</sub> (SO<sub>4</sub>)<sub>2</sub>.18H<sub>2</sub>O
C. Al<sub>3</sub> (SO<sub>4</sub>)<sub>2</sub>.18H<sub>2</sub>O
D. Al<sub>4</sub> (SO<sub>4</sub>)<sub>3</sub>.18H<sub>2</sub>O
Answer» B. Al<sub>2</sub> (SO<sub>4</sub>)<sub>2</sub>.18H<sub>2</sub>O
Discussion
17.

What is formed when coagulant is added to water?

A. Scum
B. Soap
C. Bubbles
D. Floc
Answer» E.
Discussion