Environmental Engineering Part 3

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1. BOD stands for

biotic oxidation demand

biological oxygen demand

biochemical oxygen demand

biological oxidation demand

2. 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

1,2, 3 and 4

1, 3 and 4

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

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is equal to adiabatic lapse rate

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

Algae

bryophyte

Lichen

pteridophyte

5. Minamata disease was caused by pollution of water by

tin

methyl isocyanate

mercury

lead

6. The spray tower can be used to control

(c) Both (a) and (b)

(a) gaseous pollutants

(b) particle pollutants

(d) None of these

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

pressure relief valve

sluice valve

air relief valve

reflux valve

8. Disinfection of water results in

killing of disease bacteria

complete sterilisation

removal of turbidity

removal of hardness

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

scour valve

air valve

gate valve

safety valve

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

NO₂

PAN

NO_x

HC

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11. 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 ditch around the building and filling it with water

providing a steel mesh around the building

12. Broadly speaking, water is

10 times more compressible than steel

800 times less compressible than steel

80 times more compressible than steel

80 times less compressible than steel

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

affects our sense of smell

combines with haemoglobin

is carcinogenic in nature

causes blindness

14. The pipe joint commonly used in pumping stations is

flexible joint

spigot and socket joint

flanged joint

expansion joint

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

dirty water

sewer water

potable water

polluted water

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

10 mg/litre

0.1 mg/litre

1.5 mg/litre

5 mg/litre

17. Concentration of ozone in clean air is

0.01 ppm

0.5 ppm

0.001 ppm

0.1 ppm

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

CO₂

PAN

NOx

CO

19. Two primary air pollutants are

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

nitrogen oxide and peroxyacetyl nitrate

20. For very strong sewage, BOD will be

less than 400 mg/L

1000 mg/L

more than 1500 mg/L

700 mg/L

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

0.05 ppb

0.01 ppb

0.05 ppm

0.01 ppm

22. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

expansion joint

spigot and socket joint

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

SO₂

HC

PAN

NO₂

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

ecological degradation

catastrophe

ecological disturbance

pollution

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

Inorganic suspended solids

Dissolved inorganic solids

Dissolved organic solids

Oil and grease

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

decreasing the depth of tank

increasing the surface area of tank

increasing the depth of tank

decreasing the surface area of tank

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

chemical water

hydroscopic water

gravity water

capillary water

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

CO alone

PAN and NH₃

NH₃ and CO

O₃ and PAN

29. A river with high BOD value is

highly polluted

highly productive

highly clean

None of these

30. Ground water is usually free from

dissolved impurities

both suspended impurities and dissolved impurities

none of these

suspended impurities

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

Stratosphere to Mesosphere

Troposphere to Stratosphere

Tropopause to Mesosphere

Troposphere to Stratopause

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

average hourly rate of flow

peak hourly rate of flow

minimum hourly rate of flow

sewer running half full

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

Carbon dioxide and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

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

hydrological cycle

water cycle

all of these

precipitation cycle

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

plants

man

hydrocarbon gases

fungi

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->disinfection->sedimentation-> filtration

Screening-> filtration-> sedimentation->disinfection

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

1,0 to 5.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

0.5 to 1.0 ppm

Environmental Engineering Part 3

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