Environmental Engineering Part 2

Page 1 of 4

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

10 ppm

50 ppm

30 ppm

20 ppm

2. Turbidity is measured on

standard platinum scale

standard cobalt scale

standard silica scale

platinum cobalt scale

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

reduction

sedimentation

oxidation

sunlight

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

head

middle

bottom

at any place

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

fungi

bacterias

algae

pathogens

6. Orthotolidine test is used for determination of

biochemical oxygen demand

dissolved oxygen

dose of coagulant

residual chlorine

7. The hourly variation factor is usually taken as

1.5

2.0

2.7

1.8

8. The most common cause of acidity in water is

nitrogen

oxygen

hydrogen

carbon dioxide

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

use of metering system

better standard of living of the people

good quality of water

hotter climate

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

interceptor

connecting sewer

head sewer

sewer reservoir

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

algel

aerobic bacteria

anaerobic bacteria

protozoa

12. Alignment of sewer lines is started from

the tail end

the outfall

the high point

the last point

13. In the nitrogen cycle, ammonia is produced from

cellulose

proteins

carbohydrates

sugar

14. The proper gradient of sewer lines is ensured by

plane-labelling

dumpy level

telescope

compass

15. The continuous flow of water may be expected from

artesian springs

all of these

gravity springs

surface springs

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

industrial flow

ordinary flow

dry weather flow

storm water flow

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

shape of the area

slope of the area

nature of soil

all are correct

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

lateral sewer

main sewer

street sewer

head sewer

19. A man hole is generally provided at each

junction and change of sewer diameter

bend

change of gradient

All of the above

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

V-shaped

rectangular

circular

oval shaped

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

bacterias

algae

pathogens

fungi

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

discharged sewage

treated sewage

effluent

sewage water

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

yield of source

nature of soil

all of these

size of gallery

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

10 - 20 microns

0.5 - 5 microns

5-10 microns

0.1 - 0.2 microns

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

revetral point

negative head point

invert

bottom point

26. Tests for BOD are usually made at

0° C - 1 day

20° C - 5 days

20° C - 3 days

10° C - 2 days

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

oxygen

ammonia

methane

carbon monoxide

28. 50 μm size particle is removed from gas by

gravity settling chamber

centrifugal collector

fabric filters

wet scrubbers

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

turbidity in water

residual chlorine in water

dissolved oxygen in water

hardness in water

30. The maximum efficiency of BOD removal is achieved in

digestion tanks

aerated lagoons

trickling filters

oxidation ditch

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31. During putrefaction process the gas given off is

ammonia

all of these

methane

carbon dioxide

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

incremental increase method

arithmetical increase method

geometrical increase method

graphical method

33. Bacteria in sewage are mostly

anaerobic

pathogenic

saprophytic

parasitic

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

1 mg/litre

100 mg/litre

10 mg/litre

1000 mg/litre

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

6 months

3 year

1 year

5 year

36. Direct destruction to pathogenic bacteria is caused by

chlorination

direct exposure to sunlight

filtration

oxidation

37. The distribution mains are designed for

maximum hourly demand on maximum day

average daily demand

maximum hourly demand

maximum daily demand

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

time intensity

inlet time

time of flow

time of concentration

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

reaeration

deoxygenation

oxidation

aeration

40. Fungi

grows in absence of sunlight

is in organic mass

grows in lime

grows in presence of sunlight

Environmental Engineering Part 2

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