Environmental Engineering Part 3

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1. 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

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

decreasing the depth of tank

decreasing the surface area of tank

increasing the surface area of tank

increasing the depth of tank

3. The pipe joint commonly used in pumping stations is

flanged joint

flexible joint

spigot and socket joint

expansion joint

4. 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

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

sewer running half full

minimum hourly rate of flow

average hourly rate of flow

peak hourly rate of flow

6. The pipe joint commonly used in pumping stations is

expansion joint

flanged joint

flexible joint

spigot and socket joint

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

0.01 to 0.05 ppm

1,0 to 5.0 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

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

hydrological cycle

all of these

water cycle

precipitation cycle

9. Minamata disease was caused by pollution of water by

methyl isocyanate

mercury

lead

tin

10. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

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11. Disinfection of water results in

removal of turbidity

removal of hardness

complete sterilisation

killing of disease bacteria

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

SO₂

HC

PAN

NO₂

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

ecological disturbance

ecological degradation

pollution

catastrophe

14. For very strong sewage, BOD will be

1000 mg/L

700 mg/L

less than 400 mg/L

more than 1500 mg/L

15. 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

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

providing a steel mesh around the building

16. The spray tower can be used to control

(a) gaseous pollutants

(c) Both (a) and (b)

(b) particle pollutants

(d) None of these

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

gravity water

chemical water

capillary water

hydroscopic water

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

sluice valve

reflux valve

pressure relief valve

air relief valve

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

sewer water

polluted water

potable water

dirty water

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1 and 2

2 and 3

1, 3 and 4

1,2, 3 and 4

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21. Concentration of ozone in clean air is

0.5 ppm

0.001 ppm

0.1 ppm

0.01 ppm

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

fungi

plants

hydrocarbon gases

man

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

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

NH₃ and CO

PAN and NH₃

CO alone

O₃ and PAN

25. Broadly speaking, water is

800 times less compressible than steel

80 times less compressible than steel

10 times more compressible than steel

80 times more compressible than steel

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

NOx

PAN

CO

CO₂

27. Ground water is usually free from

suspended impurities

dissolved impurities

none of these

both suspended impurities and dissolved impurities

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

Algae

pteridophyte

bryophyte

Lichen

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

0.01 ppm

0.01 ppb

0.05 ppm

0.05 ppb

30. 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

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

NO_x

HC

NO₂

PAN

32. BOD stands for

biological oxygen demand

biological oxidation demand

biochemical oxygen demand

biotic oxidation demand

33. 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

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

34. A river with high BOD value is

highly productive

highly clean

highly polluted

None of these

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

safety valve

air valve

scour valve

gate valve

36. 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-> filtration-> sedimentation->disinfection

Screening->disinfection->sedimentation-> filtration

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

5 mg/litre

1.5 mg/litre

10 mg/litre

0.1 mg/litre

Environmental Engineering Part 3

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