Environmental Engineering Part 2

Page 1 of 4

1. The distribution mains are designed for

average daily demand

maximum hourly demand on maximum day

maximum hourly demand

maximum daily demand

2. The maximum efficiency of BOD removal is achieved in

digestion tanks

oxidation ditch

trickling filters

aerated lagoons

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

oxidation

deoxygenation

aeration

reaeration

4. Turbidity is measured on

standard silica scale

standard platinum scale

platinum cobalt scale

standard cobalt scale

5. Fungi

grows in absence of sunlight

grows in lime

grows in presence of sunlight

is in organic mass

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

residual chlorine in water

hardness in water

turbidity in water

dissolved oxygen in water

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

all are correct

shape of the area

slope of the area

nature of soil

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

20 ppm

10 ppm

50 ppm

30 ppm

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

algae

fungi

bacterias

pathogens

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

time of flow

inlet time

time of concentration

time intensity

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

algae

fungi

bacterias

pathogens

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

V-shaped

oval shaped

rectangular

circular

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

better standard of living of the people

hotter climate

good quality of water

use of metering system

14. Bacteria in sewage are mostly

pathogenic

saprophytic

anaerobic

parasitic

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

at any place

bottom

middle

head

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

ammonia

carbon monoxide

oxygen

methane

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

1 mg/litre

10 mg/litre

1000 mg/litre

100 mg/litre

18. Direct destruction to pathogenic bacteria is caused by

filtration

direct exposure to sunlight

oxidation

chlorination

19. A man hole is generally provided at each

All of the above

change of gradient

bend

junction and change of sewer diameter

20. In the nitrogen cycle, ammonia is produced from

proteins

sugar

carbohydrates

cellulose

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

protozoa

anaerobic bacteria

aerobic bacteria

algel

22. Orthotolidine test is used for determination of

biochemical oxygen demand

dose of coagulant

dissolved oxygen

residual chlorine

23. The most common cause of acidity in water is

carbon dioxide

nitrogen

oxygen

hydrogen

24. Alignment of sewer lines is started from

the outfall

the last point

the tail end

the high point

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

0.5 - 5 microns

5-10 microns

10 - 20 microns

0.1 - 0.2 microns

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

oxidation

sedimentation

reduction

sunlight

27. 50 μm size particle is removed from gas by

fabric filters

wet scrubbers

gravity settling chamber

centrifugal collector

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

3 year

5 year

6 months

1 year

29. Tests for BOD are usually made at

10° C - 2 days

20° C - 3 days

20° C - 5 days

0° C - 1 day

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

graphical method

geometrical increase method

incremental increase method

arithmetical increase method

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31. The continuous flow of water may be expected from

artesian springs

surface springs

gravity springs

all of these

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

street sewer

main sewer

lateral sewer

head sewer

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

sewage water

treated sewage

effluent

discharged sewage

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

yield of source

all of these

size of gallery

nature of soil

35. The hourly variation factor is usually taken as

2.7

1.5

2.0

1.8

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

bottom point

revetral point

negative head point

invert

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

sewer reservoir

connecting sewer

interceptor

head sewer

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

industrial flow

ordinary flow

storm water flow

dry weather flow

39. The proper gradient of sewer lines is ensured by

telescope

dumpy level

plane-labelling

compass

40. During putrefaction process the gas given off is

all of these

ammonia

carbon dioxide

methane

Environmental Engineering Part 2

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