Environmental Engineering Part 3

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

Oil and grease

Dissolved inorganic solids

Inorganic suspended solids

Dissolved organic solids

2. Broadly speaking, water is

10 times more compressible than steel

80 times less compressible than steel

800 times less compressible than steel

80 times more compressible than steel

3. 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

4. The spray tower can be used to control

(c) Both (a) and (b)

(a) gaseous pollutants

(b) particle pollutants

(d) None of these

5. 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 greater than adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

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

plants

hydrocarbon gases

man

fungi

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

sewer water

potable water

polluted water

dirty water

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

2 and 3

1 and 2

1, 3 and 4

1,2, 3 and 4

9. The pipe joint commonly used in pumping stations is

flanged joint

expansion joint

flexible joint

spigot and socket joint

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

safety valve

air valve

scour valve

gate valve

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11. A river with high BOD value is

None of these

highly polluted

highly clean

highly productive

12. For very strong sewage, BOD will be

700 mg/L

more than 1500 mg/L

1000 mg/L

less than 400 mg/L

13. 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

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Troposphere to Stratopause

Stratosphere to Mesosphere

15. Minamata disease was caused by pollution of water by

lead

mercury

tin

methyl isocyanate

16. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

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

combines with haemoglobin

is carcinogenic in nature

causes blindness

affects our sense of smell

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

Lichen

pteridophyte

Algae

bryophyte

19. 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

20. Disinfection of water results in

complete sterilisation

removal of hardness

killing of disease bacteria

removal of turbidity

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

10 mg/litre

0.1 mg/litre

1.5 mg/litre

5 mg/litre

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

providing a thick bush around the building

providing a ditch around the building and filling it with water

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

providing a steel mesh around the building

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

NO_x

HC

PAN

NO₂

24. The pipe joint commonly used in pumping stations is

flexible joint

expansion joint

flanged joint

spigot and socket joint

25. Ground water is usually free from

suspended impurities

none of these

dissolved impurities

both suspended impurities and dissolved impurities

26. Concentration of ozone in clean air is

0.01 ppm

0.5 ppm

0.1 ppm

0.001 ppm

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

pressure relief valve

sluice valve

air relief valve

reflux valve

28. BOD stands for

biochemical oxygen demand

biotic oxidation demand

biological oxidation demand

biological oxygen demand

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

capillary water

chemical water

gravity water

hydroscopic water

30. 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-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

Screening-> sedimentation-> filtration-> disinfection

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

ecological disturbance

pollution

ecological degradation

catastrophe

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

sewer running half full

peak hourly rate of flow

minimum hourly rate of flow

average hourly rate of flow

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

1,0 to 5.0 ppm

0.5 to 1.0 ppm

0.01 to 0.05 ppm

0.05 to 0.5 ppm

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

PAN

CO

NOx

CO₂

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

NO₂

PAN

HC

SO₂

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

increasing the surface area of tank

decreasing the depth of tank

decreasing the surface area of tank

increasing the depth of tank

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

water cycle

precipitation cycle

hydrological cycle

all of these

Environmental Engineering Part 3

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