Environmental Engineering Part 3

Page 1 of 4

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

SO₂

PAN

HC

NO₂

2. Disinfection of water results in

removal of hardness

complete sterilisation

removal of turbidity

killing of disease bacteria

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

providing a thick bush around the building

providing a ditch around the building and filling it with water

providing a steel mesh around the building

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

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

decreasing the surface area of tank

decreasing the depth of tank

increasing the depth of tank

increasing the surface area of tank

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

CO

NOx

CO₂

PAN

6. Concentration of ozone in clean air is

0.1 ppm

0.001 ppm

0.01 ppm

0.5 ppm

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

Troposphere to Stratopause

Tropopause to Mesosphere

Stratosphere to Mesosphere

Troposphere to Stratosphere

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

scour valve

gate valve

safety valve

air valve

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

capillary water

hydroscopic water

gravity water

chemical water

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

reflux valve

sluice valve

air relief valve

pressure relief valve

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11. 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

12. The pipe joint commonly used in pumping stations is

flexible joint

spigot and socket joint

expansion joint

flanged joint

13. BOD stands for

biological oxygen demand

biological oxidation demand

biotic oxidation demand

biochemical oxygen demand

14. Minamata disease was caused by pollution of water by

methyl isocyanate

lead

tin

mercury

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

Dissolved inorganic solids

Inorganic suspended solids

Oil and grease

Dissolved organic solids

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

PAN and NH₃

CO alone

NH₃ and CO

O₃ and PAN

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

1.5 mg/litre

5 mg/litre

10 mg/litre

0.1 mg/litre

18. 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

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

water cycle

precipitation cycle

all of these

hydrological cycle

20. A river with high BOD value is

None of these

highly polluted

highly productive

highly clean

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21. For very strong sewage, BOD will be

1000 mg/L

700 mg/L

more than 1500 mg/L

less than 400 mg/L

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

bryophyte

Algae

pteridophyte

Lichen

23. The spray tower can be used to control

(a) gaseous pollutants

(b) particle pollutants

(c) Both (a) and (b)

(d) None of these

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

NO₂

NO_x

HC

PAN

25. 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

26. 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

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

0.05 ppb

0.05 ppm

0.01 ppb

0.01 ppm

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

causes blindness

combines with haemoglobin

is carcinogenic in nature

affects our sense of smell

29. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flanged joint

flexible joint

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

man

fungi

hydrocarbon gases

plants

Page 4 of 4

31. Ground water is usually free from

suspended impurities

both suspended impurities and dissolved impurities

dissolved impurities

none of these

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

polluted water

dirty water

potable water

sewer water

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

Screening-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

Screening->disinfection->sedimentation-> filtration

34. 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 and 2

1,2, 3 and 4

35. Two primary air pollutants are

ozone and peroxyacetyl nitrate

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

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

Sulphur dioxides and oxides of nitrogen

Hydrogen sulphide and oxides of nitrogen

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

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

ecological degradation

ecological disturbance

pollution

catastrophe

Environmental Engineering Part 3

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