Environmental Engineering Part 3

Page 1 of 4

1. The pipe joint commonly used in pumping stations is

flanged joint

spigot and socket joint

expansion joint

flexible joint

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

plants

man

hydrocarbon gases

fungi

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

CO₂

PAN

CO

NOx

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

5 mg/litre

10 mg/litre

0.1 mg/litre

1.5 mg/litre

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

causes blindness

combines with haemoglobin

is carcinogenic in nature

affects our sense of smell

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

decreasing the depth of tank

increasing the surface area of tank

decreasing the surface area of tank

increasing the depth of tank

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

capillary water

gravity water

chemical water

hydroscopic water

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

SO₂

HC

PAN

NO₂

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

Troposphere to Stratosphere

Tropopause to Mesosphere

Troposphere to Stratopause

Stratosphere to Mesosphere

10. Two primary air pollutants are

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

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11. The spray tower can be used to control

(c) Both (a) and (b)

(a) gaseous pollutants

(b) particle pollutants

(d) None of these

12. Concentration of ozone in clean air is

0.001 ppm

0.01 ppm

0.5 ppm

0.1 ppm

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

Sulphur dioxides and oxides of nitrogen

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

15. 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-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

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

air relief valve

sluice valve

pressure relief valve

reflux valve

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

0.01 to 0.05 ppm

1,0 to 5.0 ppm

0.5 to 1.0 ppm

0.05 to 0.5 ppm

18. Disinfection of water results in

removal of turbidity

removal of hardness

killing of disease bacteria

complete sterilisation

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

0.01 ppb

0.01 ppm

0.05 ppm

0.05 ppb

20. BOD stands for

biological oxidation demand

biological oxygen demand

biochemical oxygen demand

biotic oxidation demand

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21. 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

providing a thick bush around the building

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

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

ecological disturbance

ecological degradation

pollution

catastrophe

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

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

maximum mixing depth is equal to zero

24. Ground water is usually free from

dissolved impurities

none of these

both suspended impurities and dissolved impurities

suspended impurities

25. For very strong sewage, BOD will be

more than 1500 mg/L

less than 400 mg/L

1000 mg/L

700 mg/L

26. Minamata disease was caused by pollution of water by

lead

tin

methyl isocyanate

mercury

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

polluted water

dirty water

potable water

sewer water

28. The pipe joint commonly used in pumping stations is

flanged joint

expansion joint

flexible joint

spigot and socket joint

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

NO_x

PAN

HC

NO₂

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

Oil and grease

Inorganic suspended solids

Dissolved inorganic solids

Dissolved organic solids

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31. A river with high BOD value is

highly polluted

None of these

highly productive

highly clean

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

bryophyte

Algae

pteridophyte

Lichen

33. 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

2 and 3

1 and 2

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

PAN and NH₃

CO alone

O₃ and PAN

NH₃ and CO

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

gate valve

air valve

safety valve

scour valve

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

hydrological cycle

water cycle

all of these

precipitation cycle

37. Broadly speaking, water is

80 times less compressible than steel

800 times less compressible than steel

80 times more compressible than steel

10 times more compressible than steel

Environmental Engineering Part 3

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