Environmental Engineering Part 3

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

1,0 to 5.0 ppm

0.01 to 0.05 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

2. The spray tower can be used to control

(b) particle pollutants

(d) None of these

(c) Both (a) and (b)

(a) gaseous pollutants

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

gate valve

air valve

scour valve

safety valve

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

polluted water

potable water

dirty water

sewer water

5. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flexible joint

flanged joint

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

hydrocarbon gases

man

plants

fungi

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

reflux valve

pressure relief valve

sluice valve

air relief valve

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

capillary water

gravity water

chemical water

hydroscopic water

9. The pipe joint commonly used in pumping stations is

expansion joint

spigot and socket joint

flexible joint

flanged joint

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1, 3 and 4

1 and 2

2 and 3

1,2, 3 and 4

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

CO alone

O₃ and PAN

PAN and NH₃

NH₃ and CO

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

pollution

ecological degradation

ecological disturbance

catastrophe

13. 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

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

Troposphere to Stratopause

Stratosphere to Mesosphere

Troposphere to Stratosphere

Tropopause to Mesosphere

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

Lichen

pteridophyte

bryophyte

Algae

16. Concentration of ozone in clean air is

0.001 ppm

0.1 ppm

0.5 ppm

0.01 ppm

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

minimum hourly rate of flow

average hourly rate of flow

peak hourly rate of flow

sewer running half full

18. Disinfection of water results in

complete sterilisation

removal of turbidity

removal of hardness

killing of disease bacteria

19. 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

20. Ground water is usually free from

both suspended impurities and dissolved impurities

suspended impurities

dissolved impurities

none of these

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21. For very strong sewage, BOD will be

less than 400 mg/L

more than 1500 mg/L

700 mg/L

1000 mg/L

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

1.5 mg/litre

0.1 mg/litre

10 mg/litre

5 mg/litre

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

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Hydrogen sulphide and oxides of nitrogen

Carbon dioxide and hydrogen sulphide

24. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

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

providing a thick bush around the building

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

providing a steel mesh around the building

providing a ditch around the building and filling it with water

26. 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

27. Broadly speaking, water is

80 times less compressible than steel

800 times less compressible than steel

80 times more compressible than steel

10 times more compressible than steel

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

CO₂

NOx

CO

PAN

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

NO_x

NO₂

HC

PAN

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

PAN

SO₂

HC

NO₂

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31. Minamata disease was caused by pollution of water by

methyl isocyanate

tin

lead

mercury

32. BOD stands for

biochemical oxygen demand

biological oxygen demand

biological oxidation demand

biotic oxidation demand

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

increasing the surface area of tank

decreasing the surface area of tank

increasing the depth of tank

decreasing the depth of tank

34. A river with high BOD value is

highly polluted

highly clean

highly productive

None of these

35. 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->disinfection->sedimentation-> filtration

Screening-> sedimentation-> disinfection-> filtration

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

Dissolved inorganic solids

Dissolved organic solids

Oil and grease

Inorganic suspended solids

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

water cycle

hydrological cycle

precipitation cycle

all of these

Environmental Engineering Part 3

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