Environmental Engineering Part 2

Page 1 of 4

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

methane

ammonia

carbon monoxide

oxygen

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

nature of soil

shape of the area

all are correct

slope of the area

3. Orthotolidine test is used for determination of

dissolved oxygen

dose of coagulant

residual chlorine

biochemical oxygen demand

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

all of these

size of gallery

yield of source

nature of soil

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

fungi

bacterias

pathogens

algae

6. The most common cause of acidity in water is

nitrogen

hydrogen

carbon dioxide

oxygen

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

treated sewage

effluent

sewage water

discharged sewage

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

arithmetical increase method

geometrical increase method

incremental increase method

graphical method

9. 50 μm size particle is removed from gas by

centrifugal collector

fabric filters

gravity settling chamber

wet scrubbers

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

5 year

6 months

1 year

3 year

Page 2 of 4

11. Alignment of sewer lines is started from

the outfall

the last point

the high point

the tail end

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

5-10 microns

0.1 - 0.2 microns

10 - 20 microns

0.5 - 5 microns

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

30 ppm

10 ppm

50 ppm

20 ppm

14. Bacteria in sewage are mostly

pathogenic

anaerobic

saprophytic

parasitic

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

head sewer

street sewer

lateral sewer

main sewer

16. The continuous flow of water may be expected from

artesian springs

all of these

gravity springs

surface springs

17. Turbidity is measured on

platinum cobalt scale

standard platinum scale

standard silica scale

standard cobalt scale

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

1000 mg/litre

1 mg/litre

100 mg/litre

10 mg/litre

19. In the nitrogen cycle, ammonia is produced from

sugar

proteins

carbohydrates

cellulose

20. The proper gradient of sewer lines is ensured by

compass

plane-labelling

telescope

dumpy level

Page 3 of 4

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

anaerobic bacteria

protozoa

algel

aerobic bacteria

22. A man hole is generally provided at each

All of the above

junction and change of sewer diameter

bend

change of gradient

23. The hourly variation factor is usually taken as

1.8

2.7

2.0

1.5

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

better standard of living of the people

use of metering system

good quality of water

hotter climate

25. During putrefaction process the gas given off is

carbon dioxide

methane

all of these

ammonia

26. Fungi

is in organic mass

grows in absence of sunlight

grows in presence of sunlight

grows in lime

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

residual chlorine in water

hardness in water

turbidity in water

dissolved oxygen in water

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

circular

rectangular

V-shaped

oval shaped

29. Direct destruction to pathogenic bacteria is caused by

direct exposure to sunlight

chlorination

filtration

oxidation

30. The maximum efficiency of BOD removal is achieved in

oxidation ditch

aerated lagoons

trickling filters

digestion tanks

Page 4 of 4

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

bottom point

negative head point

invert

revetral point

32. The distribution mains are designed for

maximum hourly demand

maximum daily demand

average daily demand

maximum hourly demand on maximum day

33. 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

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

head

bottom

at any place

middle

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

oxidation

reduction

sedimentation

sunlight

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

interceptor

connecting sewer

head sewer

sewer reservoir

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

fungi

bacterias

algae

pathogens

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

aeration

reaeration

oxidation

deoxygenation

39. Tests for BOD are usually made at

20° C - 3 days

10° C - 2 days

20° C - 5 days

0° C - 1 day

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

storm water flow

ordinary flow

dry weather flow

industrial flow

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