Environmental Engineering Objective Questions with Answers - Set 08 - ObjectiveBooks

Environmental Engineering Objective Questions with Answers - Set 08

Practice Test: Question Set - 08

1. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
    (A) Check valve
    (B) Sluice valve
    (C) Safety valve
    (D) Scour valve

2. The design discharge for the separate sewer system shall be taken as
    (A) Equal to dry weather flow (DWF)
    (B) 2 × DWF
    (C) 3 × DWF
    (D) 6 × DWF

3. The most commonly used sewer under culverts is
    (A) Circular brick sewer
    (B) Circular cast iron sewer
    (C) Semi-elliptical sewer
    (D) Horseshoe type sewer

4. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
    (A) 1
    (B) 100
    (C) Infinite
    (D) Zero

5. 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

6. 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

7. 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

8. 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

9. Double filtration is used
    (A) To increase the filtration slow sand filters capacity of
    (B) To increase the filtration rapid sand filters capacity of
    (C) For isolated buildings like pools, hotels etc swimming
    (D) All of the above

10. The major disadvantage of lime soda process of water softening is that
    (A) It is unsuitable for turbid and acidic water
    (B) Huge amount of precipitate is formed which creates a disposal problem
    (C) The effluent cannot be reduced to zero hardness
    (D) It is unsuitable for softening the water of excessive hardness

11. Scour valves are provided
    (A) At street corners to control the flow of water
    (B) At every depression and dead ends to drain out the waste water that may collect there
    (C) At the foot of rising main along the slope to prevent back running of water
    (D) At every summit of rising mains

12. 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

13. The ratio of 5 day BOD to ultimate BOD is about
    (A) 1/3
    (B) 2/3
    (C) 3/4
    (D) 1.0

14. Septic tank is a
     (i) Settling tank
     (ii) Digestion tank
     (iii) Aeration tank
     The correct answer is
    (A) Only (i)
    (B) (i) and (ii)
    (C) (i) and (iii)
    (D) Only (iii)

15. The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
    (A) 9500
    (B) 9800
    (C) 10100
    (D) 10920

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