Environmental Engineering Part 3

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1. A river with high BOD value is

highly polluted

highly clean

highly productive

None of these

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

bryophyte

pteridophyte

Lichen

Algae

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

hydroscopic water

capillary water

gravity water

chemical water

4. Broadly speaking, water is

800 times less compressible than steel

10 times more compressible than steel

80 times less compressible than steel

80 times more compressible than steel

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

dirty water

polluted water

potable water

sewer water

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1, 3 and 4

2 and 3

1 and 2

1,2, 3 and 4

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

0.5 to 1.0 ppm

0.05 to 0.5 ppm

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

5 mg/litre

10 mg/litre

1.5 mg/litre

0.1 mg/litre

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

average hourly rate of flow

sewer running half full

minimum hourly rate of flow

peak hourly rate of flow

10. Disinfection of water results in

killing of disease bacteria

removal of turbidity

removal of hardness

complete sterilisation

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11. The pipe joint commonly used in pumping stations is

expansion joint

flanged joint

spigot and socket joint

flexible joint

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

Troposphere to Stratopause

Tropopause to Mesosphere

Troposphere to Stratosphere

Stratosphere to Mesosphere

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

0.05 ppm

0.05 ppb

0.01 ppm

0.01 ppb

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

gate valve

air valve

scour valve

safety valve

15. The pipe joint commonly used in pumping stations is

flexible joint

expansion joint

spigot and socket joint

flanged joint

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

Sulphur dioxides and oxides of nitrogen

Carbon dioxide and hydrogen sulphide

Methane and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

17. Ground water is usually free from

none of these

dissolved impurities

suspended impurities

both suspended impurities and dissolved impurities

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

CO₂

CO

NOx

PAN

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

PAN and NH₃

CO alone

O₃ and PAN

NH₃ and CO

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

NO₂

HC

PAN

SO₂

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

NO₂

PAN

NO_x

HC

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

all of these

precipitation cycle

water cycle

hydrological cycle

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

Inorganic suspended solids

Oil and grease

Dissolved inorganic solids

Dissolved organic solids

24. The spray tower can be used to control

(b) particle pollutants

(c) Both (a) and (b)

(d) None of these

(a) gaseous pollutants

25. 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 less than adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

26. BOD stands for

biotic oxidation demand

biological oxidation demand

biochemical oxygen demand

biological oxygen demand

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

combines with haemoglobin

causes blindness

affects our sense of smell

is carcinogenic in nature

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

plants

fungi

hydrocarbon gases

man

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

air relief valve

sluice valve

reflux valve

pressure relief valve

30. Two primary air pollutants are

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

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31. For very strong sewage, BOD will be

less than 400 mg/L

1000 mg/L

700 mg/L

more than 1500 mg/L

32. 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

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

ecological disturbance

pollution

catastrophe

ecological degradation

34. Minamata disease was caused by pollution of water by

lead

tin

methyl isocyanate

mercury

35. Concentration of ozone in clean air is

0.01 ppm

0.5 ppm

0.1 ppm

0.001 ppm

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-> filtration-> disinfection

Screening-> sedimentation-> disinfection-> filtration

Screening-> filtration-> sedimentation->disinfection

Screening->disinfection->sedimentation-> filtration

37. 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 depth of tank

increasing the surface area of tank

Environmental Engineering Part 3

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