Environmental Engineering Part 2

Page 1 of 4

1. In the nitrogen cycle, ammonia is produced from

carbohydrates

proteins

cellulose

sugar

2. The continuous flow of water may be expected from

artesian springs

gravity springs

all of these

surface springs

3. The distribution mains are designed for

average daily demand

maximum daily demand

maximum hourly demand

maximum hourly demand on maximum day

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

time of flow

time of concentration

time intensity

inlet time

5. 50 μm size particle is removed from gas by

centrifugal collector

fabric filters

wet scrubbers

gravity settling chamber

6. During putrefaction process the gas given off is

all of these

ammonia

methane

carbon dioxide

7. The hourly variation factor is usually taken as

2.0

1.5

1.8

2.7

8. Fungi

grows in presence of sunlight

grows in lime

grows in absence of sunlight

is in organic mass

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

geometrical increase method

graphical method

arithmetical increase method

incremental increase method

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

10 - 20 microns

0.1 - 0.2 microns

5-10 microns

0.5 - 5 microns

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

reduction

sedimentation

sunlight

oxidation

12. Bacteria in sewage are mostly

parasitic

anaerobic

saprophytic

pathogenic

13. Tests for BOD are usually made at

20° C - 5 days

0° C - 1 day

10° C - 2 days

20° C - 3 days

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

rectangular

V-shaped

circular

oval shaped

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

bottom

at any place

head

middle

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

all are correct

nature of soil

slope of the area

shape of the area

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

ammonia

carbon monoxide

oxygen

methane

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

all of these

nature of soil

yield of source

size of gallery

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

dissolved oxygen in water

residual chlorine in water

hardness in water

turbidity in water

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

connecting sewer

head sewer

sewer reservoir

interceptor

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21. Orthotolidine test is used for determination of

dose of coagulant

dissolved oxygen

biochemical oxygen demand

residual chlorine

22. The proper gradient of sewer lines is ensured by

dumpy level

compass

telescope

plane-labelling

23. 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

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

treated sewage

sewage water

discharged sewage

effluent

25. The maximum efficiency of BOD removal is achieved in

trickling filters

digestion tanks

aerated lagoons

oxidation ditch

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

lateral sewer

street sewer

head sewer

main sewer

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

100 mg/litre

10 mg/litre

1 mg/litre

1000 mg/litre

28. Turbidity is measured on

platinum cobalt scale

standard silica scale

standard cobalt scale

standard platinum scale

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

reaeration

deoxygenation

oxidation

aeration

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

hotter climate

good quality of water

better standard of living of the people

use of metering system

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

algel

anaerobic bacteria

aerobic bacteria

protozoa

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

pathogens

fungi

bacterias

algae

33. The most common cause of acidity in water is

oxygen

carbon dioxide

nitrogen

hydrogen

34. Direct destruction to pathogenic bacteria is caused by

filtration

chlorination

direct exposure to sunlight

oxidation

35. A man hole is generally provided at each

All of the above

junction and change of sewer diameter

bend

change of gradient

36. Alignment of sewer lines is started from

the tail end

the last point

the high point

the outfall

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

fungi

pathogens

bacterias

algae

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

6 months

5 year

3 year

1 year

39. 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

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

20 ppm

10 ppm

30 ppm

50 ppm

Environmental Engineering Part 2

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