Waste Water Engineering - Section 1 (6)

Directions to Solve

Waste Water Engineering - Section 1

Waste water engineering is a branch of this engineering and in
the following section you will find the important MCQs related to this field.

41.

Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

42.

The non-clog pump which permits solid matter to pass out with the liquid sewage, is

A.	centrifugal pump
B.	reciprocating pump
C.	pneumatic ejector
D.	none of these.

Answer: Option A

Explanation:

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43.

Pick up the correct statement from the following :

A.	pH value indicates acidity and alkalinity of sewage
B.	In acidic sewage, the pH value is less than 7
C.	In alkaline sewage, the pH value is more than 7
D.	Fresh sewage is generally alkaline
E.	All the above.

Answer: Option E

Explanation:

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44.

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

A.	1 in 60
B.	1 in 100
C.	1 in 120
D.	none of these.

Answer: Option C

Explanation:

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45.

If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

A.	D
B.	1.25 D
C.	1.5 D
D.	1.75 D
E.	2 D.

Answer: Option C

Explanation:

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46.

If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

A.	200 ppm
B.	225 ppm
C.	250 ppm
D.	None of these.

Answer: Option C

Explanation:

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47.

The rate of accumulation of sludge in septic tanks is recommended as

A.	30 litres/person/year
B.	25 litres/person/year
C.	30 litres/person/month
D.	25 litres/person/month.

Answer: Option A

Explanation:

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48.

Aerobic bacterias

A.	flourish in the presence of free oxygen
B.	consume organic matter as their food
C.	oxidise organic matter in sewage
D.	All the above.

Answer: Option D

Explanation:

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