Environmental Engineering Part 2

Page 1 of 4

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

connecting sewer

head sewer

interceptor

sewer reservoir

2. Orthotolidine test is used for determination of

dose of coagulant

dissolved oxygen

residual chlorine

biochemical oxygen demand

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

10 - 20 microns

0.1 - 0.2 microns

5-10 microns

0.5 - 5 microns

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

incremental increase method

graphical method

geometrical increase method

arithmetical increase method

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

discharged sewage

effluent

treated sewage

sewage water

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

industrial flow

dry weather flow

ordinary flow

storm water flow

7. The hourly variation factor is usually taken as

1.8

1.5

2.0

2.7

8. The maximum efficiency of BOD removal is achieved in

trickling filters

oxidation ditch

aerated lagoons

digestion tanks

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

slope of the area

shape of the area

nature of soil

all are correct

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

30 ppm

10 ppm

20 ppm

50 ppm

Page 2 of 4

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

6 months

3 year

1 year

5 year

12. The most common cause of acidity in water is

oxygen

hydrogen

carbon dioxide

nitrogen

13. Direct destruction to pathogenic bacteria is caused by

direct exposure to sunlight

filtration

oxidation

chlorination

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

at any place

head

bottom

middle

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

ammonia

oxygen

carbon monoxide

methane

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

use of metering system

hotter climate

good quality of water

better standard of living of the people

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

V-shaped

oval shaped

rectangular

circular

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

deoxygenation

oxidation

reaeration

aeration

19. During putrefaction process the gas given off is

all of these

carbon dioxide

methane

ammonia

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

aerobic bacteria

algel

anaerobic bacteria

protozoa

Page 3 of 4

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

yield of source

nature of soil

size of gallery

all of these

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

street sewer

main sewer

head sewer

lateral sewer

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

residual chlorine in water

turbidity in water

dissolved oxygen in water

hardness in water

24. The distribution mains are designed for

maximum hourly demand

maximum daily demand

average daily demand

maximum hourly demand on maximum day

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

time intensity

time of flow

inlet time

time of concentration

26. Fungi

grows in lime

grows in presence of sunlight

is in organic mass

grows in absence of sunlight

27. Bacteria in sewage are mostly

parasitic

pathogenic

saprophytic

anaerobic

28. A man hole is generally provided at each

All of the above

junction and change of sewer diameter

change of gradient

bend

29. Tests for BOD are usually made at

10° C - 2 days

0° C - 1 day

20° C - 3 days

20° C - 5 days

30. Turbidity is measured on

platinum cobalt scale

standard platinum scale

standard cobalt scale

standard silica scale

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

pathogens

fungi

algae

bacterias

32. The proper gradient of sewer lines is ensured by

telescope

dumpy level

compass

plane-labelling

33. 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

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

algae

pathogens

fungi

bacterias

35. Alignment of sewer lines is started from

the high point

the last point

the outfall

the tail end

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

sedimentation

oxidation

reduction

sunlight

37. The continuous flow of water may be expected from

gravity springs

all of these

artesian springs

surface springs

38. In the nitrogen cycle, ammonia is produced from

cellulose

proteins

sugar

carbohydrates

39. 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

100 mg/litre

1 mg/litre

40. 50 μm size particle is removed from gas by

centrifugal collector

wet scrubbers

fabric filters

gravity settling chamber

Environmental Engineering Part 2

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