Environmental Engineering Part 2

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

10 - 20 microns

5-10 microns

0.5 - 5 microns

0.1 - 0.2 microns

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

dry weather flow

industrial flow

storm water flow

ordinary flow

3. 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

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

sunlight

reduction

sedimentation

oxidation

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

lateral sewer

head sewer

main sewer

street sewer

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

methane

oxygen

ammonia

carbon monoxide

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

V-shaped

rectangular

oval shaped

circular

8. A man hole is generally provided at each

junction and change of sewer diameter

change of gradient

bend

All of the above

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

dissolved oxygen in water

hardness in water

residual chlorine in water

turbidity in water

10. In the nitrogen cycle, ammonia is produced from

sugar

cellulose

proteins

carbohydrates

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11. Fungi

grows in lime

is in organic mass

grows in presence of sunlight

grows in absence of sunlight

12. Direct destruction to pathogenic bacteria is caused by

chlorination

filtration

oxidation

direct exposure to sunlight

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

10 ppm

50 ppm

30 ppm

20 ppm

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

oxidation

aeration

reaeration

deoxygenation

15. 50 μm size particle is removed from gas by

fabric filters

centrifugal collector

gravity settling chamber

wet scrubbers

16. Tests for BOD are usually made at

20° C - 3 days

0° C - 1 day

10° C - 2 days

20° C - 5 days

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

bottom

middle

head

at any place

18. The maximum efficiency of BOD removal is achieved in

digestion tanks

oxidation ditch

trickling filters

aerated lagoons

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

graphical method

incremental increase method

geometrical increase method

arithmetical increase method

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

bacterias

fungi

pathogens

algae

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21. Orthotolidine test is used for determination of

dissolved oxygen

dose of coagulant

residual chlorine

biochemical oxygen demand

22. The most common cause of acidity in water is

hydrogen

carbon dioxide

oxygen

nitrogen

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

fungi

pathogens

bacterias

algae

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

negative head point

revetral point

bottom point

invert

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

6 months

5 year

3 year

1 year

26. The distribution mains are designed for

maximum hourly demand

average daily demand

maximum daily demand

maximum hourly demand on maximum day

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

sewer reservoir

connecting sewer

interceptor

head sewer

28. Alignment of sewer lines is started from

the tail end

the high point

the outfall

the last point

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

100 mg/litre

1000 mg/litre

10 mg/litre

1 mg/litre

30. The hourly variation factor is usually taken as

1.5

2.7

2.0

1.8

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

nature of soil

all of these

size of gallery

yield of source

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

treated sewage

effluent

sewage water

discharged sewage

33. Turbidity is measured on

standard cobalt scale

standard silica scale

standard platinum scale

platinum cobalt scale

34. The continuous flow of water may be expected from

gravity springs

all of these

surface springs

artesian springs

35. The proper gradient of sewer lines is ensured by

plane-labelling

dumpy level

telescope

compass

36. Bacteria in sewage are mostly

saprophytic

anaerobic

parasitic

pathogenic

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

all are correct

slope of the area

nature of soil

shape of the area

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

anaerobic bacteria

algel

aerobic bacteria

protozoa

39. During putrefaction process the gas given off is

ammonia

carbon dioxide

methane

all of these

40. 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

Environmental Engineering Part 2

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