Environmental Engineering Part 3

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

HC

NO₂

PAN

SO₂

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

HC

NO_x

NO₂

PAN

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

combines with haemoglobin

affects our sense of smell

causes blindness

is carcinogenic in nature

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

peak hourly rate of flow

minimum hourly rate of flow

average hourly rate of flow

sewer running half full

5. Ground water is usually free from

suspended impurities

dissolved impurities

none of these

both suspended impurities and dissolved impurities

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

chemical water

gravity water

capillary water

hydroscopic water

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

Oil and grease

Dissolved organic solids

Dissolved inorganic solids

Inorganic suspended solids

8. The pipe joint commonly used in pumping stations is

expansion joint

spigot and socket joint

flexible joint

flanged joint

9. Minamata disease was caused by pollution of water by

mercury

tin

methyl isocyanate

lead

10. 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-> sedimentation-> filtration-> disinfection

Screening->disinfection->sedimentation-> filtration

Screening-> filtration-> sedimentation->disinfection

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

fungi

man

hydrocarbon gases

plants

12. 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 ditch around the building and filling it with water

providing a steel mesh around the building

providing a thick bush around the building

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

PAN

NOx

CO

CO₂

14. Broadly speaking, water is

10 times more compressible than steel

80 times more compressible than steel

80 times less compressible than steel

800 times less compressible than steel

15. BOD stands for

biological oxidation demand

biological oxygen demand

biochemical oxygen demand

biotic oxidation demand

16. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

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

Carbon dioxide and hydrogen sulphide

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Hydrogen sulphide and oxides of nitrogen

18. The pipe joint commonly used in pumping stations is

spigot and socket joint

flexible joint

expansion joint

flanged joint

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

pressure relief valve

sluice valve

reflux valve

air relief valve

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

10 mg/litre

0.1 mg/litre

1.5 mg/litre

5 mg/litre

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

all of these

precipitation cycle

hydrological cycle

water cycle

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

Troposphere to Stratopause

Troposphere to Stratosphere

Stratosphere to Mesosphere

Tropopause to Mesosphere

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

safety valve

air valve

scour valve

gate valve

24. The spray tower can be used to control

(d) None of these

(a) gaseous pollutants

(c) Both (a) and (b)

(b) particle pollutants

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

ecological disturbance

pollution

ecological degradation

catastrophe

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

Algae

Lichen

bryophyte

pteridophyte

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

0.05 ppm

0.01 ppm

0.05 ppb

0.01 ppb

28. 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

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

2 and 3

1 and 2

1,2, 3 and 4

1, 3 and 4

30. For very strong sewage, BOD will be

1000 mg/L

700 mg/L

more than 1500 mg/L

less than 400 mg/L

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

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

environmental lapse rate is less than adiabatic lapse rate

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

O₃ and PAN

CO alone

PAN and NH₃

NH₃ and CO

33. Disinfection of water results in

complete sterilisation

killing of disease bacteria

removal of turbidity

removal of hardness

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

0.05 to 0.5 ppm

0.01 to 0.05 ppm

1,0 to 5.0 ppm

0.5 to 1.0 ppm

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

sewer water

polluted water

potable water

dirty water

36. Concentration of ozone in clean air is

0.5 ppm

0.1 ppm

0.001 ppm

0.01 ppm

37. A river with high BOD value is

highly productive

highly clean

None of these

highly polluted

Environmental Engineering Part 3

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