Environmental Engineering MCQ Questions & Answers

1

The velocity of flow does not depend on

A) Grade of sewer B) Length of sewer C) Hydraulic mean depth of sewer D) Roughness of sewer

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Answer & Solution

Answer: Option B

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2

The slope of sewer shall be

A) Given in the direction of natural slope of ground B) Given in the direction opposite to natural slope of ground C) Zero D) Steeper than 1 in 20

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Answer & Solution

Answer: Option A

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3

The overflow rate for plain sedimentation tanks is about

A) 500 to 750 liters/hour/m² B) 1000 to 1250 liters/hour/m² C) 1250 to 1500 liters/hour/m² D) 1500 to 2000 liters/hour/m²

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Answer & Solution

Answer: Option A

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4

The main disadvantage of cement concrete sewers is

A) Less strength B) Difficulty in construction C) Difficulty in transportation due to heavy weight D) Less life

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Answer & Solution

Answer: Option C

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5

Which of the following compounds is widely used for algae control?

A) Sodium sulphate B) Copper sulphate C) Sodium chloride D) Calcium chloride

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Answer & Solution

Answer: Option B

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6

Select the correct statement.

A) 5 day BOD is the ultimate BOD B) 5 day BOD is greater than 4 day BOD keeping other conditions same C) 5 day BOD is less than 4 day BOD keeping other conditions same D) BOD does not depend on time

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Answer & Solution

Answer: Option C

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7

The devices which are installed for drawing water from the sources are called

A) Aquifers B) Aquiclude C) Filters D) Intakes

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Answer & Solution

Answer: Option D

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8

The treatment of water with bleaching powder is known as

A) Pre-chlorination B) Super chlorination C) De-chlorination D) Hypo-chlorination

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Answer & Solution

Answer: Option D

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9

As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is

A) Smaller B) Larger C) Same D) None of the above

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Answer & Solution

Answer: Option A

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10

The disinfection efficiency of chlorine increases by
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water

A) Only (i) B) Both (i) and (ii) C) Both (i) and (iii) D) Only (iii)

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Answer & Solution

Answer: Option D

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Environmental Engineering MCQ Questions & Answers | Civil Engineering