Environmental Engineering Part 3

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

PAN and NH₃

O₃ and PAN

NH₃ and CO

CO alone

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

minimum hourly rate of flow

peak hourly rate of flow

average hourly rate of flow

sewer running half full

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

sewer water

polluted water

dirty water

potable water

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

PAN

SO₂

NO₂

HC

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

safety valve

air valve

scour valve

gate valve

6. The spray tower can be used to control

(b) particle pollutants

(d) None of these

(c) Both (a) and (b)

(a) gaseous pollutants

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

0.05 ppb

0.05 ppm

0.01 ppm

0.01 ppb

8. A river with high BOD value is

None of these

highly clean

highly productive

highly polluted

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

all of these

precipitation cycle

hydrological cycle

water cycle

10. Concentration of ozone in clean air is

0.5 ppm

0.1 ppm

0.001 ppm

0.01 ppm

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

decreasing the surface area of tank

increasing the surface area of tank

decreasing the depth of tank

increasing the depth of tank

12. Ground water is usually free from

both suspended impurities and dissolved impurities

suspended impurities

dissolved impurities

none of these

13. 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

14. Minamata disease was caused by pollution of water by

lead

methyl isocyanate

tin

mercury

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

bryophyte

Lichen

Algae

pteridophyte

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

Troposphere to Stratosphere

Stratosphere to Mesosphere

Tropopause to Mesosphere

Troposphere to Stratopause

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

environmental lapse rate is equal to adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

18. 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-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

19. For very strong sewage, BOD will be

less than 400 mg/L

1000 mg/L

more than 1500 mg/L

700 mg/L

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

affects our sense of smell

is carcinogenic in nature

causes blindness

combines with haemoglobin

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

providing a ditch around the building and filling it with water

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

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

1.5 mg/litre

10 mg/litre

0.1 mg/litre

5 mg/litre

23. The pipe joint commonly used in pumping stations is

flexible joint

spigot and socket joint

flanged joint

expansion joint

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

0.01 to 0.05 ppm

0.5 to 1.0 ppm

0.05 to 0.5 ppm

1,0 to 5.0 ppm

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

chemical water

capillary water

gravity water

hydroscopic water

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1,2, 3 and 4

2 and 3

1 and 2

1, 3 and 4

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

PAN

HC

NO_x

NO₂

28. Disinfection of water results in

complete sterilisation

removal of hardness

killing of disease bacteria

removal of turbidity

29. Two primary air pollutants are

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

30. BOD stands for

biological oxygen demand

biological oxidation demand

biotic oxidation demand

biochemical oxygen demand

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31. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flexible joint

flanged joint

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

CO₂

CO

NOx

PAN

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

man

fungi

plants

hydrocarbon gases

34. 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

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

Carbon dioxide and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

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

ecological degradation

catastrophe

pollution

ecological disturbance

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

reflux valve

pressure relief valve

air relief valve

sluice valve

Environmental Engineering Part 3

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