Environmental Engineering Part 2

Page 1 of 4

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

5-10 microns

0.5 - 5 microns

0.1 - 0.2 microns

10 - 20 microns

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

aeration

reaeration

oxidation

deoxygenation

3. Bacteria in sewage are mostly

saprophytic

parasitic

pathogenic

anaerobic

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

all are correct

slope of the area

nature of soil

shape of the area

5. Turbidity is measured on

standard cobalt scale

standard silica scale

standard platinum scale

platinum cobalt scale

6. 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

7. Direct destruction to pathogenic bacteria is caused by

filtration

chlorination

direct exposure to sunlight

oxidation

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

ammonia

carbon monoxide

oxygen

methane

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

algel

anaerobic bacteria

protozoa

aerobic bacteria

10. Alignment of sewer lines is started from

the last point

the tail end

the outfall

the high point

Page 2 of 4

11. In the nitrogen cycle, ammonia is produced from

carbohydrates

cellulose

proteins

sugar

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

oval shaped

circular

V-shaped

rectangular

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

main sewer

lateral sewer

street sewer

head sewer

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

treated sewage

sewage water

discharged sewage

effluent

15. During putrefaction process the gas given off is

methane

ammonia

all of these

carbon dioxide

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

sunlight

reduction

oxidation

sedimentation

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

middle

head

bottom

at any place

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

algae

fungi

bacterias

pathogens

19. 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

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

inlet time

time of flow

time of concentration

time intensity

Page 3 of 4

21. The proper gradient of sewer lines is ensured by

telescope

dumpy level

compass

plane-labelling

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

1 year

5 year

6 months

3 year

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

interceptor

sewer reservoir

connecting sewer

head sewer

24. Orthotolidine test is used for determination of

residual chlorine

dose of coagulant

biochemical oxygen demand

dissolved oxygen

25. A man hole is generally provided at each

bend

change of gradient

All of the above

junction and change of sewer diameter

26. The hourly variation factor is usually taken as

1.8

1.5

2.7

2.0

27. The most common cause of acidity in water is

carbon dioxide

hydrogen

oxygen

nitrogen

28. The continuous flow of water may be expected from

artesian springs

gravity springs

all of these

surface springs

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

residual chlorine in water

hardness in water

dissolved oxygen in water

turbidity in water

30. Tests for BOD are usually made at

10° C - 2 days

20° C - 3 days

20° C - 5 days

0° C - 1 day

Page 4 of 4

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

good quality of water

use of metering system

better standard of living of the people

hotter climate

32. 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

1000 mg/litre

10 mg/litre

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

30 ppm

20 ppm

50 ppm

10 ppm

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

yield of source

nature of soil

size of gallery

all of these

35. The distribution mains are designed for

maximum daily demand

maximum hourly demand

maximum hourly demand on maximum day

average daily demand

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

arithmetical increase method

incremental increase method

geometrical increase method

graphical method

37. The maximum efficiency of BOD removal is achieved in

digestion tanks

aerated lagoons

trickling filters

oxidation ditch

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

fungi

pathogens

algae

bacterias

39. Fungi

grows in absence of sunlight

is in organic mass

grows in presence of sunlight

grows in lime

40. 50 μm size particle is removed from gas by

gravity settling chamber

centrifugal collector

fabric filters

wet scrubbers

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