Environmental Engineering Part 2

Page 1 of 4

1. The proper gradient of sewer lines is ensured by

plane-labelling

dumpy level

compass

telescope

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

10 ppm

30 ppm

50 ppm

20 ppm

3. A man hole is generally provided at each

junction and change of sewer diameter

change of gradient

bend

All of the above

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

deoxygenation

reaeration

oxidation

aeration

5. 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

6. Alignment of sewer lines is started from

the high point

the tail end

the last point

the outfall

7. The hourly variation factor is usually taken as

1.5

2.7

1.8

2.0

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

graphical method

incremental increase method

arithmetical increase method

geometrical increase method

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

3 year

1 year

5 year

6 months

10. Tests for BOD are usually made at

20° C - 5 days

10° C - 2 days

20° C - 3 days

0° C - 1 day

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

hardness in water

residual chlorine in water

turbidity in water

dissolved oxygen in water

12. Direct destruction to pathogenic bacteria is caused by

oxidation

filtration

direct exposure to sunlight

chlorination

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

bacterias

algae

pathogens

fungi

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

10 mg/litre

1000 mg/litre

1 mg/litre

100 mg/litre

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

nature of soil

yield of source

size of gallery

all of these

16. Orthotolidine test is used for determination of

biochemical oxygen demand

residual chlorine

dose of coagulant

dissolved oxygen

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

ammonia

oxygen

methane

carbon monoxide

18. Turbidity is measured on

standard cobalt scale

standard platinum scale

platinum cobalt scale

standard silica scale

19. 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

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

bottom

at any place

head

middle

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21. In the nitrogen cycle, ammonia is produced from

sugar

carbohydrates

cellulose

proteins

22. 50 μm size particle is removed from gas by

fabric filters

wet scrubbers

centrifugal collector

gravity settling chamber

23. 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

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

street sewer

main sewer

lateral sewer

head sewer

25. Fungi

grows in absence of sunlight

grows in lime

is in organic mass

grows in presence of sunlight

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

treated sewage

sewage water

effluent

discharged sewage

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

slope of the area

shape of the area

nature of soil

all are correct

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

use of metering system

hotter climate

better standard of living of the people

good quality of water

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

algae

bacterias

pathogens

fungi

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

revetral point

invert

bottom point

negative head point

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

V-shaped

circular

rectangular

oval shaped

32. The most common cause of acidity in water is

oxygen

hydrogen

carbon dioxide

nitrogen

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

algel

protozoa

anaerobic bacteria

aerobic bacteria

34. During putrefaction process the gas given off is

carbon dioxide

all of these

ammonia

methane

35. The continuous flow of water may be expected from

surface springs

artesian springs

all of these

gravity springs

36. The distribution mains are designed for

maximum hourly demand on maximum day

maximum daily demand

maximum hourly demand

average daily demand

37. Bacteria in sewage are mostly

saprophytic

pathogenic

anaerobic

parasitic

38. The maximum efficiency of BOD removal is achieved in

aerated lagoons

digestion tanks

trickling filters

oxidation ditch

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

connecting sewer

sewer reservoir

head sewer

interceptor

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

oxidation

sunlight

sedimentation

reduction

Environmental Engineering Part 2

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