Explore topic-wise MCQs in Environmental Engineering.

This section includes 5 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.

The contact time for disinfection by combined chlorine is ______________

A. 20 minutes
B. 30 minutes
C. 40 minutes
D. 60 minutes
Answer» E.
Discussion
2.

The contact time for disinfection by free chlorine is ______________

A. 20 minutes
B. 30 minutes
C. 40 minutes
D. 60minutes
Answer» B. 30 minutes
Discussion
3.

The efficiency of chlorine increase by ______________

A. Presence of metallic compounds
B. When the pH of the water increases
C. When the pH of the water decreases
D. Turbid water
Answer» D. Turbid water
Discussion
4.

The amount of hypochlorous acid formed when pH of water is 8 is _______________

A. 95% of total free chlorine
B. 80% of total free chlorine
C. 30% of total free chlorine
D. 5% of total free chlorine
Answer» D. 5% of total free chlorine
Discussion
5.

When turbidity in water increases, the efficiency of chlorine?

A. Decreases
B. Increases
C. Slightly increases
D. Remains constant
Answer» B. Increases
Discussion