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Environmental Engineering MCQ Quiz Practice Test-1

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

The distribution mains are designed for

Maximum daily demand

Maximum hourly demand

Average daily demand

Maximum hourly demand on maximum day

Sewage treatment units are designed for

Maximum flow only

Minimum flow only

Average flow only

Maximum and minimum flow

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

4.5 to 6.0

6.5 to 8.0

8.5 to 10.0

10.5 to 12.0

The pathogens can be killed by

Nitrification

Chlorination

Oxidation

None of the above

Orthotolidine test is used for determination of

Dissolved oxygen

Residual chlorine

Biochemical oxygen demand

Dose of coagulant

Period of cleaning of slow sand filters is about

24 - 48 hours

10 - 12 days

2 - 3 months

1 - 2 year

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

50 to 60

100 to 150

500 to 600

1400 to 1500

The working conditions in imhoff tanks are

Aerobic only

Anaerobic only

Aerobic in lower compartment and anaerobic in upper compartment

Anaerobic in lower compartment and aerobic in upper compartment

The self cleansing velocity for all sewers in India is usually

Less than 1.0 m/sec

1.0 m/sec to 1.2 m/sec

1.5 m/sec to 2.0 m/sec

3.0 m/sec to 3.5 m/sec

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