Environmental Engineering Objective Questions with Answers – Set 08

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Q1. The specific gravity of sewage is

(A) Much greater than 1
(B) Slightly less than 1
(C) Equal to 1
(D) Slightly greater than 1

Answer:(D) Slightly greater than 1

Q2. 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

Answer: (B) 6.5 to 8.0

Q3. Standard BOD is measured at

(A) 20°C – 1 day
(B) 25°C – 3 day
(C) 20°C – 5 day
(D) 30°C – 5 day

Answer: (C) 20°C – 5 day

Q4. As compared to cast iron pipes, steel pipes are

(A) Heavier
(B) Stronger
(C) Costlier
(D) Less susceptible to corrosion

Answer: (B) Stronger

Q5. Which of the following retards the self purification of stream?

(A) Higher temperature
(B) Sunlight
(C) Satisfying oxygen demand
(D) None of the above

Answer: (D) None of the above

Q6. As compared to geometrical increase method of forecasting population, arithmetical increase method gives

(A) Lesser value
(B) Higher value
(C) Same value
(D) Accurate value

Answer: (A) Lesser value

Q7. The velocity of flow of water in a sedimentation tank is about

(A) 5 to 10 cm/sec
(B) 15 to 30 cm/sec
(C) 15 to 30 cm/minute
(D) 15 to 30 cm/hour

Answer: (C) 15 to 30 cm/minute

Q8. The design discharge for the combined sewer system shall be taken as

(A) Equal to rainfall
(B) Rainfall + DWF
(C) Rainfall + 2 DWF
(D) Rainfall + 6 DWF

Answer: (C) Rainfall + 2 DWF

Q9. Sewerage system is designed for

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

Answer: (D) Maximum and minimum flow

Q10. The phenolic compounds in public water supply should not be more than

(A) 0.1 ppm
(B) 0.01 ppm
(C) 0.001 ppm
(D) 0.0001 ppm

Answer:(C) 0.001 ppm

Q11. Alum as a coagulant is found to be most effective when pH range of water is

(A) 2 to 4
(B) 4 to 6
(C) 6 to 8
(D) 8 to 10

Answer: (C) 6 to 8

Q12. If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

(A) 1000
(B) 4000
(C) 1,00,000
(D) 4,00,000

Answer: (D) 4,00,000

Q13. In facultative stabilization pond, the sewage is treated by

(A) Aerobic bacteria only
(B) Algae only
(C) Dual action of aerobic bacteria and anaerobic bacteria
(D) Sedimentation

Answer: (C) Dual action of aerobic bacteria and anaerobic bacteria

Q14. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

(A) 10 to 25
(B) 50
(C) 75
(D) 100

Answer: (C) 75

Q15. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

(A) 0.2 to 0.4
(B) 0.4 to 1.0
(C) 2 to 4
(D) 5 to 7

Answer: (C) 2 to 4

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