Environmental Engineering Part 2

Page 1 of 4

1. Partly or completely treated sewage flowing out of a sewage treatment tank or plant is called

discharged sewage

treated sewage

sewage water

effluent

2. Bacteria in sewage are mostly

pathogenic

anaerobic

saprophytic

parasitic

3. A man hole is generally provided at each

bend

All of the above

junction and change of sewer diameter

change of gradient

4. The lowest point of the interior of a sewer or drain at any cross-section is called

revetral point

invert

negative head point

bottom point

5. The quantity of storm water from an area depends upon

shape of the area

all are correct

nature of soil

slope of the area

6. Alignment of sewer lines is started from

the high point

the outfall

the tail end

the last point

7. 50 μm size particle is removed from gas by

gravity settling chamber

wet scrubbers

centrifugal collector

fabric filters

8. The quantity of water available from an infiltration gallery depends upon the

all of these

size of gallery

nature of soil

yield of source

9. Hydraulically the economical section of drains for large flow is

rectangular

oval shaped

circular

V-shaped

10. Fungi

grows in presence of sunlight

grows in lime

is in organic mass

grows in absence of sunlight

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11. A street sewer into which sewer from house connections is poured is called

head sewer

street sewer

lateral sewer

main sewer

12. Which of the following causes a decrease in per capita consumption?

good quality of water

hotter climate

better standard of living of the people

use of metering system

13. The depletion of dissolved oxygen due to BOD reaction of sewage is called

aeration

reaeration

deoxygenation

oxidation

14. During putrefaction process the gas given off is

methane

carbon dioxide

ammonia

all of these

15. A sewer which receives its flow from a number of transverse sewers or outlets is called

sewer reservoir

interceptor

head sewer

connecting sewer

16. In a combined sewer when only the industrial or sanitary sewage are flowing, then it is termed as

ordinary flow

industrial flow

storm water flow

dry weather flow

17. The proper gradient of sewer lines is ensured by

compass

plane-labelling

telescope

dumpy level

18. The distribution mains are designed for

maximum hourly demand

average daily demand

maximum daily demand

maximum hourly demand on maximum day

19. The most common cause of acidity in water is

carbon dioxide

hydrogen

oxygen

nitrogen

20. The cells of bacteria are usually in the range of

5-10 microns

10 - 20 microns

0.5 - 5 microns

0.1 - 0.2 microns

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21. Orthotolidine test is used for determination of

dissolved oxygen

residual chlorine

dose of coagulant

biochemical oxygen demand

22. The suitable method of forecasting population for a young and rapidly increasing city is

graphical method

arithmetical increase method

geometrical increase method

incremental increase method

23. In the nitrogen cycle, ammonia is produced from

proteins

carbohydrates

cellulose

sugar

24. In biological treatment there is formation of a biological film of

algel

anaerobic bacteria

protozoa

aerobic bacteria

25. "The pathogens in river flows are killed and helps in self-purification". It is due to

sedimentation

oxidation

sunlight

reduction

26. The continuous flow of water may be expected from

artesian springs

surface springs

all of these

gravity springs

27. The ratio in between length of the sewer and velocity of flow when running full is known as

time intensity

time of concentration

time of flow

inlet time

28. The septic tank should be cleaned at regular interval but should not exceed

3 year

1 year

6 months

5 year

29. On standard silica scale, the turbidity in drinking water should be limited to

50 ppm

30 ppm

10 ppm

20 ppm

30. During the treatment of sewage it is necessary to kill the

bacterias

algae

fungi

pathogens

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31. Standard EDTA ( ethylene diamine tetra acetic acid ) solution is used to determine the

hardness in water

dissolved oxygen in water

turbidity in water

residual chlorine in water

32. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

1000 mg/litre

10 mg/litre

1 mg/litre

100 mg/litre

33. Tests for BOD are usually made at

20° C - 5 days

20° C - 3 days

0° C - 1 day

10° C - 2 days

34. The gas that is mainly responsible for explosion in sewers is

carbon monoxide

ammonia

oxygen

methane

35. Turbidity is measured on

standard cobalt scale

standard platinum scale

standard silica scale

platinum cobalt scale

36. Direct destruction to pathogenic bacteria is caused by

filtration

chlorination

direct exposure to sunlight

oxidation

37. The location of flushing tank in a sewer in order to flush the sewer should be at its

head

middle

bottom

at any place

38. The hourly variation factor is usually taken as

1.8

2.7

1.5

2.0

39. During the treatment of sewage it is necessary to kill the

pathogens

fungi

bacterias

algae

40. The maximum efficiency of BOD removal is achieved in

trickling filters

oxidation ditch

aerated lagoons

digestion tanks

Environmental Engineering Part 2

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