Environmental Engineering Part 3

Page 1 of 4

1. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

2. A river with high BOD value is

None of these

highly clean

highly productive

highly polluted

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

Lichen

Algae

pteridophyte

bryophyte

4. 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

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

0.05 ppm

0.01 ppm

0.01 ppb

0.05 ppb

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

ecological degradation

catastrophe

pollution

ecological disturbance

7. 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-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> filtration-> disinfection

Screening->disinfection->sedimentation-> filtration

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

hydrological cycle

all of these

water cycle

precipitation cycle

9. The spray tower can be used to control

(d) None of these

(c) Both (a) and (b)

(b) particle pollutants

(a) gaseous pollutants

10. Minamata disease was caused by pollution of water by

tin

mercury

lead

methyl isocyanate

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

SO₂

HC

PAN

NO₂

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

average hourly rate of flow

sewer running half full

peak hourly rate of flow

minimum hourly rate of flow

13. Disinfection of water results in

killing of disease bacteria

complete sterilisation

removal of turbidity

removal of hardness

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

PAN

HC

NO_x

NO₂

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

capillary water

gravity water

chemical water

hydroscopic water

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

CO alone

NH₃ and CO

PAN and NH₃

O₃ and PAN

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

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

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

18. 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

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

0.1 mg/litre

1.5 mg/litre

10 mg/litre

5 mg/litre

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

scour valve

air valve

safety valve

gate valve

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21. Concentration of ozone in clean air is

0.1 ppm

0.01 ppm

0.5 ppm

0.001 ppm

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

Troposphere to Stratopause

Troposphere to Stratosphere

Stratosphere to Mesosphere

Tropopause to Mesosphere

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

dirty water

sewer water

potable water

polluted water

24. BOD stands for

biotic oxidation demand

biochemical oxygen demand

biological oxidation demand

biological oxygen demand

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

Hydrogen sulphide and oxides of nitrogen

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

26. 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

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1 and 2

1, 3 and 4

2 and 3

1,2, 3 and 4

28. 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

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

CO

PAN

CO₂

NOx

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

increasing the depth of tank

increasing the surface area of tank

decreasing the surface area of tank

decreasing the depth of tank

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

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

environmental lapse rate is greater than adiabatic lapse rate

32. The pipe joint commonly used in pumping stations is

spigot and socket joint

flanged joint

expansion joint

flexible joint

33. For very strong sewage, BOD will be

1000 mg/L

less than 400 mg/L

more than 1500 mg/L

700 mg/L

34. The pipe joint commonly used in pumping stations is

expansion joint

flanged joint

flexible joint

spigot and socket joint

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

man

hydrocarbon gases

plants

fungi

36. Ground water is usually free from

suspended impurities

none of these

dissolved impurities

both suspended impurities and dissolved impurities

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

pressure relief valve

reflux valve

sluice valve

air relief valve

Environmental Engineering Part 3

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