Environmental Engineering Part 3

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

Algae

bryophyte

pteridophyte

Lichen

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

NO₂

PAN

SO₂

HC

3. Minamata disease was caused by pollution of water by

tin

mercury

methyl isocyanate

lead

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

sluice valve

reflux valve

pressure relief valve

air relief valve

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

scour valve

safety valve

gate valve

air valve

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

water cycle

precipitation cycle

all of these

hydrological cycle

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

0.1 mg/litre

10 mg/litre

5 mg/litre

1.5 mg/litre

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

HC

PAN

NO_x

NO₂

9. The pipe joint commonly used in pumping stations is

flanged joint

flexible joint

spigot and socket joint

expansion joint

10. Ground water is usually free from

none of these

dissolved impurities

suspended impurities

both suspended impurities and dissolved impurities

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

hydroscopic water

chemical water

gravity water

capillary water

12. Concentration of ozone in clean air is

0.01 ppm

0.5 ppm

0.1 ppm

0.001 ppm

13. A river with high BOD value is

highly clean

highly polluted

highly productive

None of these

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

Screening-> sedimentation-> disinfection-> filtration

Screening->disinfection->sedimentation-> filtration

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> filtration-> disinfection

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

O₃ and PAN

CO alone

NH₃ and CO

PAN and NH₃

16. For very strong sewage, BOD will be

1000 mg/L

more than 1500 mg/L

700 mg/L

less than 400 mg/L

17. Disinfection of water results in

removal of turbidity

killing of disease bacteria

removal of hardness

complete sterilisation

18. BOD stands for

biological oxygen demand

biochemical oxygen demand

biotic oxidation demand

biological oxidation demand

19. 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 ditch around the building and filling it with water

providing a thick bush around the building

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

decreasing the surface area of tank

increasing the depth of tank

decreasing the depth of tank

increasing the surface area of tank

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

0.5 to 1.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

1,0 to 5.0 ppm

22. Two primary air pollutants are

ozone and peroxyacetyl nitrate

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

23. The pipe joint commonly used in pumping stations is

spigot and socket joint

flexible joint

expansion joint

flanged joint

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

sewer water

polluted water

potable water

dirty water

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

plants

fungi

hydrocarbon gases

man

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

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

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

Stratosphere to Mesosphere

Tropopause to Mesosphere

Troposphere to Stratopause

Troposphere to Stratosphere

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

Dissolved inorganic solids

Dissolved organic solids

Oil and grease

Inorganic suspended solids

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

sewer running half full

peak hourly rate of flow

average hourly rate of flow

minimum hourly rate of flow

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

CO

CO₂

NOx

PAN

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

ecological disturbance

catastrophe

pollution

ecological degradation

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

0.01 ppb

0.05 ppm

0.05 ppb

0.01 ppm

33. Broadly speaking, water is

80 times less compressible than steel

10 times more compressible than steel

80 times more compressible than steel

800 times less compressible than steel

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

is carcinogenic in nature

combines with haemoglobin

affects our sense of smell

causes blindness

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1 and 2

1, 3 and 4

2 and 3

1,2, 3 and 4

36. The spray tower can be used to control

(d) None of these

(c) Both (a) and (b)

(a) gaseous pollutants

(b) particle pollutants

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

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

maximum mixing depth is equal to zero

Environmental Engineering Part 3

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