Environmental Engineering Part 3

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1. The pipe joint commonly used in pumping stations is

expansion joint

flexible joint

spigot and socket joint

flanged joint

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

0.01 ppm

0.05 ppb

0.05 ppm

0.01 ppb

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

pteridophyte

Algae

bryophyte

Lichen

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

Dissolved organic solids

Dissolved inorganic solids

Oil and grease

Inorganic suspended solids

5. For very strong sewage, BOD will be

more than 1500 mg/L

700 mg/L

less than 400 mg/L

1000 mg/L

6. Concentration of ozone in clean air is

0.1 ppm

0.5 ppm

0.001 ppm

0.01 ppm

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

affects our sense of smell

causes blindness

is carcinogenic in nature

combines with haemoglobin

8. 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

9. Two primary air pollutants are

ozone and peroxyacetyl nitrate

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

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

NO₂

SO₂

HC

PAN

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

12. A river with high BOD value is

highly productive

highly polluted

highly clean

None of these

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

CO₂

PAN

CO

NOx

14. Ground water is usually free from

both suspended impurities and dissolved impurities

suspended impurities

dissolved impurities

none of these

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

increasing the surface area of tank

decreasing the surface area of tank

decreasing the depth of tank

increasing the depth of tank

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1, 3 and 4

1,2, 3 and 4

1 and 2

2 and 3

17. 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 equal to adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

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

PAN

NO_x

HC

NO₂

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

ecological degradation

catastrophe

ecological disturbance

pollution

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

gate valve

safety valve

air valve

scour valve

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21. 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->disinfection->sedimentation-> filtration

Screening-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

22. Disinfection of water results in

removal of hardness

removal of turbidity

complete sterilisation

killing of disease bacteria

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

1,0 to 5.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

0.5 to 1.0 ppm

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

0.1 mg/litre

5 mg/litre

1.5 mg/litre

10 mg/litre

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

average hourly rate of flow

peak hourly rate of flow

minimum hourly rate of flow

sewer running half full

26. The pipe joint commonly used in pumping stations is

spigot and socket joint

flanged joint

expansion joint

flexible joint

27. Broadly speaking, water is

80 times less compressible than steel

80 times more compressible than steel

10 times more compressible than steel

800 times less compressible than steel

28. BOD stands for

biological oxidation demand

biological oxygen demand

biochemical oxygen demand

biotic oxidation demand

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

water cycle

precipitation cycle

hydrological cycle

all of these

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

Carbon dioxide and hydrogen sulphide

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Hydrogen sulphide and oxides of nitrogen

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

plants

hydrocarbon gases

fungi

man

32. Minamata disease was caused by pollution of water by

tin

lead

methyl isocyanate

mercury

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

gravity water

hydroscopic water

chemical water

capillary water

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

air relief valve

pressure relief valve

reflux valve

sluice valve

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

sewer water

dirty water

polluted water

potable water

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

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

providing a thick bush around the building

37. The spray tower can be used to control

(d) None of these

(a) gaseous pollutants

(c) Both (a) and (b)

(b) particle pollutants

Environmental Engineering Part 3

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