Environmental Engineering Part 3

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

dirty water

potable water

sewer water

polluted water

2. 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

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

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

providing a ditch around the building and filling it with water

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

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is greater than adiabatic lapse rate

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

PAN

CO

CO₂

NOx

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

0.01 to 0.05 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

1,0 to 5.0 ppm

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

capillary water

hydroscopic water

gravity water

chemical water

8. 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

Hydrogen sulphide and oxides of nitrogen

Methane and hydrogen sulphide

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

Tropopause to Mesosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

Troposphere to Stratosphere

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

PAN

SO₂

HC

NO₂

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

0.05 ppb

0.05 ppm

0.01 ppb

0.01 ppm

12. BOD stands for

biotic oxidation demand

biological oxidation demand

biological oxygen demand

biochemical oxygen demand

13. 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 and 2

2 and 3

1, 3 and 4

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

5 mg/litre

1.5 mg/litre

10 mg/litre

0.1 mg/litre

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

average hourly rate of flow

minimum hourly rate of flow

sewer running half full

peak hourly rate of flow

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

increasing the depth of tank

decreasing the surface area of tank

increasing the surface area of tank

decreasing the depth of tank

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

scour valve

gate valve

safety valve

air valve

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

sluice valve

reflux valve

pressure relief valve

air relief valve

19. The pipe joint commonly used in pumping stations is

flanged joint

expansion joint

spigot and socket joint

flexible joint

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

Oil and grease

Dissolved organic solids

Dissolved inorganic solids

Inorganic suspended solids

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

man

fungi

hydrocarbon gases

plants

22. Ground water is usually free from

both suspended impurities and dissolved impurities

dissolved impurities

none of these

suspended impurities

23. For very strong sewage, BOD will be

more than 1500 mg/L

less than 400 mg/L

1000 mg/L

700 mg/L

24. Disinfection of water results in

complete sterilisation

removal of hardness

removal of turbidity

killing of disease bacteria

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

pollution

ecological degradation

ecological disturbance

catastrophe

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

Lichen

Algae

pteridophyte

bryophyte

27. The spray tower can be used to control

(c) Both (a) and (b)

(b) particle pollutants

(a) gaseous pollutants

(d) None of these

28. Concentration of ozone in clean air is

0.5 ppm

0.1 ppm

0.001 ppm

0.01 ppm

29. 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

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

water cycle

precipitation cycle

all of these

hydrological cycle

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31. The pipe joint commonly used in pumping stations is

flanged joint

expansion joint

flexible joint

spigot and socket joint

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

O₃ and PAN

CO alone

NH₃ and CO

PAN and NH₃

33. Minamata disease was caused by pollution of water by

tin

mercury

lead

methyl isocyanate

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

HC

PAN

NO_x

NO₂

35. A river with high BOD value is

highly clean

None of these

highly polluted

highly productive

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->disinfection->sedimentation-> filtration

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

37. Two primary air pollutants are

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

Environmental Engineering Part 3

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