Environmental Engineering Part 2

Page 1 of 4

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

sunlight

reduction

oxidation

sedimentation

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

main sewer

head sewer

lateral sewer

street sewer

3. Tests for BOD are usually made at

0° C - 1 day

20° C - 5 days

20° C - 3 days

10° C - 2 days

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

anaerobic bacteria

protozoa

algel

aerobic bacteria

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

better standard of living of the people

hotter climate

use of metering system

good quality of water

6. Alignment of sewer lines is started from

the last point

the outfall

the tail end

the high point

7. The most common cause of acidity in water is

oxygen

hydrogen

nitrogen

carbon dioxide

8. Direct destruction to pathogenic bacteria is caused by

chlorination

oxidation

filtration

direct exposure to sunlight

9. The proper gradient of sewer lines is ensured by

telescope

dumpy level

plane-labelling

compass

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

1 year

3 year

6 months

5 year

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

head

at any place

bottom

middle

12. Orthotolidine test is used for determination of

biochemical oxygen demand

dose of coagulant

dissolved oxygen

residual chlorine

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

fungi

bacterias

pathogens

algae

14. 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

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

hardness in water

turbidity in water

dissolved oxygen in water

residual chlorine in water

16. 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

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

circular

oval shaped

V-shaped

rectangular

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

slope of the area

nature of soil

all are correct

shape of the area

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

fungi

bacterias

pathogens

algae

20. 50 μm size particle is removed from gas by

gravity settling chamber

wet scrubbers

fabric filters

centrifugal collector

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

oxygen

carbon monoxide

ammonia

methane

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

invert

negative head point

bottom point

revetral point

23. The continuous flow of water may be expected from

surface springs

gravity springs

artesian springs

all of these

24. 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

25. In the nitrogen cycle, ammonia is produced from

cellulose

carbohydrates

sugar

proteins

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

aeration

deoxygenation

oxidation

reaeration

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

dry weather flow

industrial flow

ordinary flow

storm water flow

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

30 ppm

10 ppm

50 ppm

20 ppm

29. The maximum efficiency of BOD removal is achieved in

digestion tanks

oxidation ditch

aerated lagoons

trickling filters

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

nature of soil

size of gallery

all of these

yield of source

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31. During putrefaction process the gas given off is

carbon dioxide

methane

all of these

ammonia

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

effluent

treated sewage

sewage water

discharged sewage

33. A man hole is generally provided at each

bend

junction and change of sewer diameter

change of gradient

All of the above

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

connecting sewer

head sewer

interceptor

sewer reservoir

35. The hourly variation factor is usually taken as

1.8

2.0

2.7

1.5

36. Turbidity is measured on

standard silica scale

standard cobalt scale

standard platinum scale

platinum cobalt scale

37. Bacteria in sewage are mostly

anaerobic

saprophytic

pathogenic

parasitic

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

0.1 - 0.2 microns

5-10 microns

10 - 20 microns

0.5 - 5 microns

39. The distribution mains are designed for

maximum hourly demand

average daily demand

maximum daily demand

maximum hourly demand on maximum day

40. Fungi

grows in absence of sunlight

grows in lime

grows in presence of sunlight

is in organic mass

Environmental Engineering Part 2

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