Environmental Engineering Part 3

Page 1 of 4

1. Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinking purpose?

Screening->disinfection->sedimentation-> filtration

Screening-> sedimentation-> filtration-> disinfection

Screening-> sedimentation-> disinfection-> filtration

Screening-> filtration-> sedimentation->disinfection

2. For a given discharge, the efficiency of sedimentation tank can be increased by

increasing the depth of tank

increasing the surface area of tank

decreasing the depth of tank

decreasing the surface area of tank

3. The dispersion of air pollutants in atmosphere is maximum when

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

maximum mixing depth is equal to zero

4. Which is the major air pollutant present in photochemical smog?

NO₂

NO_x

HC

PAN

5. The permissible limit of arsenic in drinking water as per the guidelines of WHO is

0.05 ppb

0.01 ppb

0.05 ppm

0.01 ppm

6. What are the air pollutants responsible for acid rain within and downwind areas of major industrial emissions?

Methane and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

Carbon dioxide and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

7. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

1,0 to 5.0 ppm

0.01 to 0.05 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

8. Which one of the following is the range of ozonosphere in atmosphere?

Stratosphere to Mesosphere

Tropopause to Mesosphere

Troposphere to Stratopause

Troposphere to Stratosphere

9. The valve provided on the suction pipe in a tube well is

sluice valve

pressure relief valve

reflux valve

air relief valve

10. Water containing substances which are undesirable, harmful or unfit for drinking and domestic uses is called

potable water

polluted water

dirty water

sewer water

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11. Concentration of ozone in clean air is

0.01 ppm

0.001 ppm

0.5 ppm

0.1 ppm

12. Which of the following air pollutants is not present in automobile exhaust gas?

PAN

NOx

CO₂

CO

13. In order to control the flow of water through pipes, a _________________ is provided.

safety valve

scour valve

air valve

gate valve

14. Which of the following is the major cause of pollution?

man

plants

fungi

hydrocarbon gases

15. The water utilizable by plants is available in the form of

chemical water

gravity water

hydroscopic water

capillary water

16. The maximum permissible limit for fluoride in drinking water is

10 mg/litre

1.5 mg/litre

0.1 mg/litre

5 mg/litre

17. In urban air pollution, the most poisonous gas is supposed to be carbon monoxide. It is hazardous because it

affects our sense of smell

combines with haemoglobin

causes blindness

is carcinogenic in nature

18. BOD stands for

biotic oxidation demand

biological oxidation demand

biological oxygen demand

biochemical oxygen demand

19. The earth's water circulatory system is known as

water cycle

all of these

precipitation cycle

hydrological cycle

20. For very strong sewage, BOD will be

more than 1500 mg/L

700 mg/L

less than 400 mg/L

1000 mg/L

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21. Which is the major pollutant present in photochemical smog?

HC

PAN

SO₂

NO₂

22. The spray tower can be used to control

(a) gaseous pollutants

(d) None of these

(b) particle pollutants

(c) Both (a) and (b)

23. Two primary air pollutants are

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

24. A river with high BOD value is

highly productive

None of these

highly clean

highly polluted

25. The unfavorable alteration of environment due to human activities is termed as

catastrophe

ecological degradation

pollution

ecological disturbance

26. The pipe joint commonly used in pumping stations is

flanged joint

expansion joint

flexible joint

spigot and socket joint

27. Broadly speaking, water is

10 times more compressible than steel

80 times more compressible than steel

800 times less compressible than steel

80 times less compressible than steel

28. Which of the following is the best indicator of SO₂ pollutant?

pteridophyte

Algae

Lichen

bryophyte

29. A sewer is commonly designed to attain self-cleansing velocity at

minimum hourly rate of flow

peak hourly rate of flow

sewer running half full

average hourly rate of flow

30. Noise pollution in a road-side building can be reduced by

planting tall trees around the building and fencing them with barbed wires

providing a steel mesh around the building

providing a thick bush around the building

providing a ditch around the building and filling it with water

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31. The pipe joint commonly used in pumping stations is

expansion joint

flexible joint

spigot and socket joint

flanged joint

32. Minamata disease was caused by pollution of water by

tin

methyl isocyanate

mercury

lead

33. Which of the following pollutants are generally not removed in a sewage treatment plant?

Dissolved inorganic solids

Oil and grease

Dissolved organic solids

Inorganic suspended solids

34. Ground water is usually free from

none of these

suspended impurities

dissolved impurities

both suspended impurities and dissolved impurities

35. Which of the following air pollutants are responsible for the Green House effect?

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

2 and 3

1, 3 and 4

1,2, 3 and 4

1 and 2

36. Disinfection of water results in

complete sterilisation

removal of turbidity

killing of disease bacteria

removal of hardness

37. Which one of the following pollutants or pairs of pollutants is formed due to photochemical reactions?

PAN and NH₃

O₃ and PAN

CO alone

NH₃ and CO

Environmental Engineering Part 3

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