Environmental Engineering Part 3

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1. The pipe joint commonly used in pumping stations is

spigot and socket joint

flanged joint

flexible joint

expansion joint

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

causes blindness

combines with haemoglobin

affects our sense of smell

is carcinogenic in nature

3. For very strong sewage, BOD will be

700 mg/L

more than 1500 mg/L

1000 mg/L

less than 400 mg/L

4. Disinfection of water results in

removal of hardness

killing of disease bacteria

complete sterilisation

removal of turbidity

5. A river with high BOD value is

highly clean

None of these

highly polluted

highly productive

6. 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

7. BOD stands for

biochemical oxygen demand

biological oxidation demand

biotic oxidation demand

biological oxygen demand

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

precipitation cycle

all of these

water cycle

hydrological cycle

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

10 mg/litre

0.1 mg/litre

5 mg/litre

1.5 mg/litre

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

Troposphere to Stratopause

Troposphere to Stratosphere

Stratosphere to Mesosphere

Tropopause to Mesosphere

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11. 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

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

fungi

plants

man

hydrocarbon gases

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

NO_x

PAN

HC

NO₂

14. 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

providing a ditch around the building and filling it with water

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

15. 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

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

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

peak hourly rate of flow

minimum hourly rate of flow

sewer running half full

average hourly rate of flow

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

potable water

polluted water

sewer water

dirty water

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

pteridophyte

bryophyte

Algae

Lichen

19. 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

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

pollution

ecological degradation

catastrophe

ecological disturbance

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21. Broadly speaking, water is

80 times less compressible than steel

10 times more compressible than steel

800 times less compressible than steel

80 times more compressible than steel

22. Ground water is usually free from

none of these

suspended impurities

dissolved impurities

both suspended impurities and dissolved impurities

23. Minamata disease was caused by pollution of water by

tin

lead

mercury

methyl isocyanate

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

chemical water

hydroscopic water

gravity water

capillary water

25. 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

1,0 to 5.0 ppm

0.5 to 1.0 ppm

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

0.01 ppm

0.05 ppb

0.01 ppb

0.05 ppm

27. The pipe joint commonly used in pumping stations is

spigot and socket joint

flanged joint

expansion joint

flexible joint

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

air valve

scour valve

gate valve

safety valve

29. 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

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

PAN

HC

SO₂

NO₂

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31. The spray tower can be used to control

(d) None of these

(b) particle pollutants

(a) gaseous pollutants

(c) Both (a) and (b)

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

maximum mixing depth is equal to zero

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

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

Dissolved organic solids

Inorganic suspended solids

Oil and grease

Dissolved inorganic solids

34. Concentration of ozone in clean air is

0.001 ppm

0.5 ppm

0.1 ppm

0.01 ppm

35. Two primary air pollutants are

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

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

PAN

CO

NOx

CO₂

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

air relief valve

pressure relief valve

reflux valve

sluice valve

Environmental Engineering Part 3

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