Environmental Engineering Part 3

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

NO₂

HC

PAN

SO₂

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

environmental lapse rate is less than adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

3. BOD stands for

biological oxygen demand

biological oxidation demand

biotic oxidation demand

biochemical oxygen demand

4. A river with high BOD value is

highly productive

highly clean

highly polluted

None of these

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

NO₂

PAN

HC

NO_x

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

NH₃ and CO

O₃ and PAN

CO alone

PAN and NH₃

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

pteridophyte

bryophyte

Algae

Lichen

8. Minamata disease was caused by pollution of water by

lead

methyl isocyanate

tin

mercury

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

1,0 to 5.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

0.5 to 1.0 ppm

10. Broadly speaking, water is

80 times less compressible than steel

800 times less compressible than steel

10 times more compressible than steel

80 times more compressible than steel

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

increasing the surface area of tank

increasing the depth of tank

decreasing the surface area of tank

decreasing the depth of tank

12. Two primary air pollutants are

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

ozone and peroxyacetyl nitrate

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

average hourly rate of flow

minimum hourly rate of flow

peak hourly rate of flow

sewer running half full

14. 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

15. Disinfection of water results in

removal of hardness

removal of turbidity

complete sterilisation

killing of disease bacteria

16. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

expansion joint

spigot and socket joint

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

water cycle

all of these

precipitation cycle

hydrological cycle

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

0.01 ppb

0.05 ppb

0.01 ppm

0.05 ppm

19. The spray tower can be used to control

(a) gaseous pollutants

(b) particle pollutants

(d) None of these

(c) Both (a) and (b)

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

safety valve

air valve

scour valve

gate valve

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

dirty water

polluted water

sewer water

potable water

22. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flanged joint

flexible joint

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

10 mg/litre

5 mg/litre

1.5 mg/litre

0.1 mg/litre

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

providing a steel mesh around the building

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

providing a thick bush around the building

providing a ditch around the building and filling it with water

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

catastrophe

ecological disturbance

ecological degradation

pollution

26. Concentration of ozone in clean air is

0.001 ppm

0.5 ppm

0.01 ppm

0.1 ppm

27. For very strong sewage, BOD will be

1000 mg/L

700 mg/L

more than 1500 mg/L

less than 400 mg/L

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

chemical water

capillary water

gravity water

hydroscopic water

29. 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

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

air relief valve

reflux valve

pressure relief valve

sluice valve

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

Screening-> filtration-> sedimentation->disinfection

Screening->disinfection->sedimentation-> filtration

Screening-> sedimentation-> disinfection-> filtration

Screening-> sedimentation-> filtration-> disinfection

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

Oil and grease

Dissolved inorganic solids

Dissolved organic solids

Inorganic suspended solids

33. Ground water is usually free from

suspended impurities

dissolved impurities

none of these

both suspended impurities and dissolved impurities

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

NOx

CO₂

CO

PAN

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

Stratosphere to Mesosphere

Troposphere to Stratosphere

Tropopause to Mesosphere

Troposphere to Stratopause

36. 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

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

hydrocarbon gases

plants

fungi

man

Environmental Engineering Part 3

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