Environmental Engineering Part 2

Page 1 of 4

1. Bacteria in sewage are mostly

anaerobic

parasitic

pathogenic

saprophytic

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

size of gallery

all of these

nature of soil

yield of source

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

main sewer

head sewer

lateral sewer

street sewer

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

turbidity in water

residual chlorine in water

hardness in water

dissolved oxygen in water

5. The proper gradient of sewer lines is ensured by

telescope

plane-labelling

dumpy level

compass

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

arithmetical increase method

graphical method

geometrical increase method

incremental increase method

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

anaerobic bacteria

protozoa

algel

aerobic bacteria

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

invert

negative head point

revetral point

bottom point

9. A man hole is generally provided at each

junction and change of sewer diameter

change of gradient

All of the above

bend

10. The distribution mains are designed for

maximum hourly demand on maximum day

maximum hourly demand

maximum daily demand

average daily demand

Page 2 of 4

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

deoxygenation

aeration

oxidation

reaeration

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

fungi

pathogens

algae

bacterias

13. Direct destruction to pathogenic bacteria is caused by

filtration

oxidation

chlorination

direct exposure to sunlight

14. Fungi

grows in absence of sunlight

is in organic mass

grows in presence of sunlight

grows in lime

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

good quality of water

use of metering system

hotter climate

better standard of living of the people

16. Tests for BOD are usually made at

20° C - 5 days

0° C - 1 day

10° C - 2 days

20° C - 3 days

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

carbon monoxide

methane

oxygen

ammonia

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

oxidation

sunlight

reduction

sedimentation

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

50 ppm

30 ppm

20 ppm

10 ppm

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

oval shaped

V-shaped

circular

rectangular

Page 3 of 4

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

3 year

6 months

5 year

1 year

22. Turbidity is measured on

standard silica scale

standard cobalt scale

standard platinum scale

platinum cobalt scale

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

treated sewage

discharged sewage

effluent

sewage water

24. Orthotolidine test is used for determination of

dose of coagulant

dissolved oxygen

biochemical oxygen demand

residual chlorine

25. The hourly variation factor is usually taken as

2.0

1.5

1.8

2.7

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

sewer reservoir

interceptor

head sewer

connecting sewer

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

shape of the area

all are correct

nature of soil

slope of the area

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

head

at any place

middle

bottom

29. Alignment of sewer lines is started from

the outfall

the tail end

the high point

the last point

30. 50 μm size particle is removed from gas by

wet scrubbers

fabric filters

gravity settling chamber

centrifugal collector

Page 4 of 4

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

storm water flow

industrial flow

dry weather flow

ordinary flow

32. The most common cause of acidity in water is

oxygen

hydrogen

nitrogen

carbon dioxide

33. The continuous flow of water may be expected from

artesian springs

surface springs

all of these

gravity springs

34. 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

35. In the nitrogen cycle, ammonia is produced from

proteins

sugar

carbohydrates

cellulose

36. 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

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

fungi

pathogens

bacterias

algae

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

time of concentration

time intensity

inlet time

time of flow

39. During putrefaction process the gas given off is

carbon dioxide

methane

all of these

ammonia

40. The maximum efficiency of BOD removal is achieved in

oxidation ditch

digestion tanks

trickling filters

aerated lagoons

Environmental Engineering Part 2

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Environmental Engineering Part 2

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection