Environmental Engineering Part 2

Page 1 of 4

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

turbidity in water

dissolved oxygen in water

hardness in water

residual chlorine in water

2. During putrefaction process the gas given off is

methane

carbon dioxide

ammonia

all of these

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

oval shaped

rectangular

circular

V-shaped

4. Tests for BOD are usually made at

10° C - 2 days

0° C - 1 day

20° C - 3 days

20° C - 5 days

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

reduction

oxidation

sedimentation

sunlight

6. Fungi

is in organic mass

grows in presence of sunlight

grows in absence of sunlight

grows in lime

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

bacterias

fungi

pathogens

algae

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

0.1 - 0.2 microns

10 - 20 microns

5-10 microns

0.5 - 5 microns

9. Bacteria in sewage are mostly

pathogenic

anaerobic

parasitic

saprophytic

10. The hourly variation factor is usually taken as

1.8

2.7

1.5

2.0

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

algae

bacterias

fungi

pathogens

12. In the nitrogen cycle, ammonia is produced from

proteins

carbohydrates

cellulose

sugar

13. Alignment of sewer lines is started from

the high point

the last point

the outfall

the tail end

14. Orthotolidine test is used for determination of

residual chlorine

biochemical oxygen demand

dose of coagulant

dissolved oxygen

15. The continuous flow of water may be expected from

artesian springs

gravity springs

surface springs

all of these

16. 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

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

20 ppm

10 ppm

30 ppm

50 ppm

18. The maximum efficiency of BOD removal is achieved in

aerated lagoons

oxidation ditch

digestion tanks

trickling filters

19. 50 μm size particle is removed from gas by

fabric filters

gravity settling chamber

centrifugal collector

wet scrubbers

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

methane

oxygen

carbon monoxide

ammonia

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21. The distribution mains are designed for

maximum hourly demand

maximum daily demand

maximum hourly demand on maximum day

average daily demand

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

all of these

size of gallery

nature of soil

yield of source

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

aeration

reaeration

deoxygenation

oxidation

24. Direct destruction to pathogenic bacteria is caused by

chlorination

direct exposure to sunlight

filtration

oxidation

25. The most common cause of acidity in water is

hydrogen

carbon dioxide

nitrogen

oxygen

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

anaerobic bacteria

algel

aerobic bacteria

protozoa

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

lateral sewer

main sewer

head sewer

street sewer

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

geometrical increase method

arithmetical increase method

graphical method

incremental increase method

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

all are correct

slope of the area

nature of soil

shape of the area

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

inlet time

time intensity

time of flow

time of concentration

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

10 mg/litre

1 mg/litre

100 mg/litre

1000 mg/litre

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

5 year

6 months

3 year

1 year

33. A man hole is generally provided at each

change of gradient

All of the above

bend

junction and change of sewer diameter

34. The proper gradient of sewer lines is ensured by

plane-labelling

compass

dumpy level

telescope

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

treated sewage

sewage water

discharged sewage

effluent

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

ordinary flow

dry weather flow

industrial flow

storm water flow

37. Turbidity is measured on

standard silica scale

standard platinum scale

platinum cobalt scale

standard cobalt scale

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

head sewer

interceptor

sewer reservoir

connecting sewer

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

middle

bottom

head

at any place

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

revetral point

bottom point

negative head point

invert

Environmental Engineering Part 2

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