Environmental Engineering Part 2

Page 1 of 4

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

incremental increase method

geometrical increase method

graphical method

arithmetical increase method

2. 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

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

street sewer

lateral sewer

main sewer

head sewer

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

dissolved oxygen in water

turbidity in water

residual chlorine in water

hardness in water

5. 50 μm size particle is removed from gas by

fabric filters

wet scrubbers

gravity settling chamber

centrifugal collector

6. Tests for BOD are usually made at

10° C - 2 days

0° C - 1 day

20° C - 3 days

20° C - 5 days

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

reaeration

aeration

oxidation

deoxygenation

8. The maximum efficiency of BOD removal is achieved in

trickling filters

digestion tanks

oxidation ditch

aerated lagoons

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

hotter climate

use of metering system

better standard of living of the people

good quality of water

10. The most common cause of acidity in water is

oxygen

hydrogen

carbon dioxide

nitrogen

Page 2 of 4

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

6 months

1 year

3 year

5 year

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

middle

at any place

head

bottom

13. Alignment of sewer lines is started from

the outfall

the tail end

the high point

the last point

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

algel

anaerobic bacteria

aerobic bacteria

protozoa

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

20 ppm

50 ppm

30 ppm

10 ppm

16. Orthotolidine test is used for determination of

biochemical oxygen demand

dissolved oxygen

residual chlorine

dose of coagulant

17. Bacteria in sewage are mostly

anaerobic

pathogenic

parasitic

saprophytic

18. The proper gradient of sewer lines is ensured by

compass

plane-labelling

dumpy level

telescope

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

bottom point

revetral point

invert

negative head point

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

storm water flow

industrial flow

ordinary flow

dry weather flow

Page 3 of 4

21. The continuous flow of water may be expected from

surface springs

all of these

artesian springs

gravity springs

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

oxidation

sunlight

reduction

sedimentation

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

1000 mg/litre

10 mg/litre

1 mg/litre

100 mg/litre

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

pathogens

fungi

bacterias

algae

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

algae

bacterias

fungi

pathogens

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

head sewer

interceptor

sewer reservoir

connecting sewer

27. In the nitrogen cycle, ammonia is produced from

cellulose

sugar

carbohydrates

proteins

28. Fungi

grows in absence of sunlight

is in organic mass

grows in lime

grows in presence of sunlight

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

nature of soil

yield of source

size of gallery

all of these

30. Direct destruction to pathogenic bacteria is caused by

filtration

chlorination

direct exposure to sunlight

oxidation

Page 4 of 4

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

all are correct

nature of soil

slope of the area

shape of the area

32. A man hole is generally provided at each

change of gradient

junction and change of sewer diameter

All of the above

bend

33. Turbidity is measured on

platinum cobalt scale

standard cobalt scale

standard platinum scale

standard silica scale

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

10 - 20 microns

0.5 - 5 microns

5-10 microns

0.1 - 0.2 microns

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

circular

oval shaped

V-shaped

rectangular

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

treated sewage

discharged sewage

sewage water

effluent

37. During putrefaction process the gas given off is

all of these

ammonia

carbon dioxide

methane

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

carbon monoxide

methane

oxygen

ammonia

39. The distribution mains are designed for

maximum daily demand

maximum hourly demand

average daily demand

maximum hourly demand on maximum day

40. The hourly variation factor is usually taken as

1.8

2.0

2.7

1.5

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