Waste Water Engineering MCQ Questions & Answers

1

The effluent of a septic tank is

A) Fit for discharge into any open drain B) Foul and contains dissolved and suspended solids C) As good as that from a complete treatment D) None of these

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Answer & Solution

Answer: Option A

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2

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

A) 0°C B) 15°C C) 20°C D) 25°C

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Answer & Solution

Answer: Option C

Solution:

In waste water engineering, the 5-day biochemical oxygen demand (BOD₅) test is typically conducted at a temperature of 20°C. This specific temperature is considered standard for measuring the amount of dissolved oxygen consumed by microorganisms during a 5-day incubation period.

Therefore, the correct completion is: "5 days-Biochemical Oxygen Demand (BOD₅) is taken at a temperature of 20°C."

3

The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

A) 1 in 5 B) 1 in 10 C) 1 in 15 D) 1 in 20

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Answer & Solution

Answer: Option B

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4

Drop manholes are the manholes

A) Without entry ladders B) Without manhole covers C) With depths more than 3.5 m D) Having drains at different levels

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Answer & Solution

Answer: Option D

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5

For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

A) 100 cm B) 120 cm C) 140 cm D) 160 cm

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Answer & Solution

Answer: Option D

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6

The rainfall at any place may be determined by

A) Its intensity B) Its direction C) Its frequency D) All the above

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Answer & Solution

Answer: Option D

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7

The clarigesters are

A) Circular septic tanks B) Rectangular septic tanks C) Circular Imhoff double tanks with bottom hoppers D) Circular Imhoff double storey tanks without bottom hoppers

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Answer & Solution

Answer: Option D

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8

If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

A) Manually B) Mechanically C) Hydraulically D) Electrically

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Answer & Solution

Answer: Option A

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9

In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

A) 10.0 B) 5.0 C) 2.0 D) 0.25

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Answer & Solution

Answer: Option D

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10

A manhole is classified as shallow if its depth is between

A) 0.4 to 0.5 m B) 0.5 to 0.7 m C) 0.7 to 0.9 m D) 0.9 to 1.20 m

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Answer & Solution

Answer: Option C

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering