Environmental Engineering Part 3

Page 1 of 4

1. 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-> filtration-> disinfection

Screening-> sedimentation-> disinfection-> filtration

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

NO₂

SO₂

HC

PAN

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

NH₃ and CO

O₃ and PAN

PAN and NH₃

CO alone

4. Two primary air pollutants are

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

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

water cycle

all of these

hydrological cycle

precipitation cycle

6. Ground water is usually free from

dissolved impurities

none of these

suspended impurities

both suspended impurities and dissolved impurities

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

providing a steel mesh 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 thick bush around the building

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

combines with haemoglobin

affects our sense of smell

causes blindness

is carcinogenic in nature

9. The spray tower can be used to control

(a) gaseous pollutants

(c) Both (a) and (b)

(d) None of these

(b) particle pollutants

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

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

Page 2 of 4

11. The pipe joint commonly used in pumping stations is

expansion joint

spigot and socket joint

flexible joint

flanged joint

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

man

hydrocarbon gases

fungi

plants

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

sewer running half full

minimum hourly rate of flow

peak hourly rate of flow

average hourly rate of flow

14. BOD stands for

biochemical oxygen demand

biological oxygen demand

biological oxidation demand

biotic oxidation demand

15. Concentration of ozone in clean air is

0.01 ppm

0.1 ppm

0.5 ppm

0.001 ppm

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

Lichen

Algae

bryophyte

pteridophyte

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

0.01 ppm

0.01 ppb

0.05 ppb

0.05 ppm

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

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

environmental lapse rate is equal to adiabatic lapse rate

19. 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

20. 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

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

Inorganic suspended solids

Oil and grease

Dissolved inorganic solids

Dissolved organic solids

22. Minamata disease was caused by pollution of water by

lead

tin

mercury

methyl isocyanate

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

air relief valve

sluice valve

pressure relief valve

reflux valve

24. Broadly speaking, water is

800 times less compressible than steel

80 times less compressible than steel

80 times more compressible than steel

10 times more compressible than steel

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

PAN

NO₂

NO_x

HC

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

chemical water

gravity water

hydroscopic water

capillary water

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

NOx

CO

CO₂

PAN

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

potable water

sewer water

polluted water

dirty water

29. For very strong sewage, BOD will be

more than 1500 mg/L

1000 mg/L

less than 400 mg/L

700 mg/L

30. Disinfection of water results in

removal of hardness

complete sterilisation

killing of disease bacteria

removal of turbidity

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31. A river with high BOD value is

highly polluted

highly clean

highly productive

None of these

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Troposphere to Stratopause

Stratosphere to Mesosphere

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

scour valve

gate valve

safety valve

air valve

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

decreasing the depth of tank

increasing the depth of tank

increasing the surface area of tank

decreasing the surface area of tank

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

catastrophe

pollution

ecological disturbance

ecological degradation

36. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flanged joint

flexible joint

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

1.5 mg/litre

10 mg/litre

5 mg/litre

0.1 mg/litre

Environmental Engineering Part 3

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