Environmental Engineering Part 3

Page 1 of 4

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

sluice valve

reflux valve

pressure relief valve

air relief valve

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1,2, 3 and 4

2 and 3

1, 3 and 4

1 and 2

3. Concentration of ozone in clean air is

0.001 ppm

0.1 ppm

0.5 ppm

0.01 ppm

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

Troposphere to Stratosphere

Troposphere to Stratopause

Stratosphere to Mesosphere

Tropopause to Mesosphere

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

Algae

bryophyte

Lichen

pteridophyte

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

average hourly rate of flow

sewer running half full

minimum hourly rate of flow

peak hourly rate of flow

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

NO_x

HC

NO₂

PAN

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

CO

NOx

PAN

CO₂

9. 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

10. The spray tower can be used to control

(b) particle pollutants

(c) Both (a) and (b)

(d) None of these

(a) gaseous pollutants

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11. For very strong sewage, BOD will be

more than 1500 mg/L

700 mg/L

1000 mg/L

less than 400 mg/L

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

5 mg/litre

1.5 mg/litre

10 mg/litre

0.1 mg/litre

13. A river with high BOD value is

None of these

highly polluted

highly productive

highly clean

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

0.5 to 1.0 ppm

0.01 to 0.05 ppm

1,0 to 5.0 ppm

0.05 to 0.5 ppm

15. Minamata disease was caused by pollution of water by

methyl isocyanate

lead

tin

mercury

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

man

hydrocarbon gases

plants

fungi

17. Disinfection of water results in

removal of hardness

killing of disease bacteria

removal of turbidity

complete sterilisation

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

ecological disturbance

catastrophe

pollution

ecological degradation

19. Broadly speaking, water is

80 times less compressible than steel

80 times more compressible than steel

800 times less compressible than steel

10 times more compressible than steel

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

hydroscopic water

capillary water

chemical water

gravity water

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

affects our sense of smell

combines with haemoglobin

causes blindness

is carcinogenic in nature

22. The pipe joint commonly used in pumping stations is

flanged joint

spigot and socket joint

expansion joint

flexible joint

23. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

24. BOD stands for

biochemical oxygen demand

biological oxidation demand

biological oxygen demand

biotic oxidation demand

25. Ground water is usually free from

dissolved impurities

none of these

both suspended impurities and dissolved impurities

suspended impurities

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

Carbon dioxide and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

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

precipitation cycle

all of these

hydrological cycle

water cycle

28. 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->disinfection->sedimentation-> filtration

Screening-> sedimentation-> filtration-> disinfection

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

CO alone

PAN and NH₃

NH₃ and CO

O₃ and PAN

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

Dissolved inorganic solids

Inorganic suspended solids

Dissolved organic solids

Oil and grease

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31. 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 steel mesh around the building

providing a ditch around the building and filling it with water

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

decreasing the surface area of tank

increasing the surface area of tank

decreasing the depth of tank

increasing the depth of tank

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

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is less than adiabatic lapse rate

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

PAN

NO₂

HC

SO₂

35. The pipe joint commonly used in pumping stations is

expansion joint

spigot and socket joint

flexible joint

flanged joint

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

dirty water

sewer water

polluted water

potable water

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

gate valve

safety valve

scour valve

air valve

Environmental Engineering Part 3

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