# Environmental Engineering Objective Questions with Answers – Set 08

Are you guys looking for Civil Engineering MCQ Questions with Answers PDF Free Download as per Civil Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Civil Engineering. Each question has four options followed by the right answer. These Civil Engineering MCQ Questions are selected supported by the newest exam pattern.

## 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

## 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

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

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

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

## 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

## Environmental Engineering MCQs all set-

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