Environmental Engineering MCQ Questions & Answers

1

Which of the following values of pH represents a stronger acid?

A) 2 B) 5 C) 7 D) 10

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

2

The distribution mains are designed for

A) Maximum daily demand B) Maximum hourly demand C) Average daily demand D) Maximum hourly demand on maximum day

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

3

Sewage treatment units are designed for

A) Maximum flow only B) Minimum flow only C) Average flow only D) Maximum and minimum flow

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

4

For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

A) 4.5 to 6.0 B) 6.5 to 8.0 C) 8.5 to 10.0 D) 10.5 to 12.0

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

5

The pathogens can be killed by

A) Nitrification B) Chlorination C) Oxidation D) None of the above

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

6

Orthotolidine test is used for determination of

A) Dissolved oxygen B) Residual chlorine C) Biochemical oxygen demand D) Dose of coagulant

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

7

Period of cleaning of slow sand filters is about

A) 24 - 48 hours B) 10 - 12 days C) 2 - 3 months D) 1 - 2 year

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

8

The rate of filtration in slow sand filters in million litres per day per hectare is about

A) 50 to 60 B) 100 to 150 C) 500 to 600 D) 1400 to 1500

Discuss

Answer & Solution

Answer: Option A

Solution:

Slow sand filters operate at a very low filtration rate because the purification mainly occurs through biological action in the schmutzdecke layer formed on top of the sand.

The typical rate of filtration for slow sand filters is 0.1 to 0.2 m³/m²/hr, which when converted equals approximately 50 to 60 million litres per day per hectare (MLD/ha).

Thus, the correct filtration rate range matches Option A.

9

The working conditions in imhoff tanks are

A) Aerobic only B) Anaerobic only C) Aerobic in lower compartment and anaerobic in upper compartment D) Anaerobic in lower compartment and aerobic in upper compartment

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

10

The self cleansing velocity for all sewers in India is usually

A) Less than 1.0 m/sec B) 1.0 m/sec to 1.2 m/sec C) 1.5 m/sec to 2.0 m/sec D) 3.0 m/sec to 3.5 m/sec

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Environmental Engineering MCQ Questions & Answers | Civil Engineering