Environmental Engineering Part 3

Page 1 of 4

1. 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 thick bush around the building

providing a ditch around the building and filling it with water

providing a steel mesh around the building

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

is carcinogenic in nature

affects our sense of smell

combines with haemoglobin

causes blindness

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

bryophyte

pteridophyte

Lichen

Algae

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

gravity water

capillary water

chemical water

hydroscopic water

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

decreasing the surface area of tank

increasing the depth of tank

increasing the surface area of tank

decreasing the depth of tank

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1,2, 3 and 4

1, 3 and 4

1 and 2

2 and 3

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

1.5 mg/litre

10 mg/litre

0.1 mg/litre

5 mg/litre

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

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

environmental lapse rate is equal to adiabatic lapse rate

10. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

expansion joint

spigot and socket joint

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

HC

PAN

SO₂

NO₂

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

Carbon dioxide and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

13. Disinfection of water results in

complete sterilisation

killing of disease bacteria

removal of turbidity

removal of hardness

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

pressure relief valve

sluice valve

air relief valve

reflux valve

15. Ground water is usually free from

none of these

dissolved impurities

both suspended impurities and dissolved impurities

suspended impurities

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

O₃ and PAN

NH₃ and CO

CO alone

PAN and NH₃

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

polluted water

dirty water

sewer water

potable water

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

safety valve

scour valve

air valve

gate valve

19. For very strong sewage, BOD will be

1000 mg/L

more than 1500 mg/L

less than 400 mg/L

700 mg/L

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

ecological disturbance

ecological degradation

catastrophe

pollution

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21. 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

22. The pipe joint commonly used in pumping stations is

spigot and socket joint

flanged joint

flexible joint

expansion joint

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

0.05 ppm

0.05 ppb

0.01 ppb

0.01 ppm

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

peak hourly rate of flow

average hourly rate of flow

sewer running half full

minimum hourly rate of flow

25. Concentration of ozone in clean air is

0.01 ppm

0.001 ppm

0.1 ppm

0.5 ppm

26. Minamata disease was caused by pollution of water by

mercury

methyl isocyanate

lead

tin

27. Two primary air pollutants are

sulphur dioxide and hydrocarbon

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

28. The spray tower can be used to control

(c) Both (a) and (b)

(b) particle pollutants

(a) gaseous pollutants

(d) None of these

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

CO₂

NOx

PAN

CO

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

0.5 to 1.0 ppm

1,0 to 5.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

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

Oil and grease

Dissolved organic solids

Inorganic suspended solids

Dissolved inorganic solids

32. BOD stands for

biochemical oxygen demand

biological oxidation demand

biological oxygen demand

biotic oxidation demand

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

plants

man

hydrocarbon gases

fungi

34. Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinking purpose?

Screening->disinfection->sedimentation-> filtration

Screening-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

35. A river with high BOD value is

highly clean

highly productive

highly polluted

None of these

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

NO₂

NO_x

HC

PAN

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

all of these

precipitation cycle

hydrological cycle

water cycle

Environmental Engineering Part 3

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