Environmental Engineering Part 3

Page 1 of 4

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

NO₂

PAN

NO_x

HC

2. Broadly speaking, water is

10 times more compressible than steel

80 times more compressible than steel

80 times less compressible than steel

800 times less compressible than steel

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

pressure relief valve

air relief valve

sluice valve

reflux valve

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

0.1 mg/litre

10 mg/litre

5 mg/litre

1.5 mg/litre

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

gravity water

chemical water

hydroscopic water

capillary water

6. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

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

decreasing the surface area of tank

increasing the depth of tank

decreasing the depth of tank

increasing the surface area of tank

8. Disinfection of water results in

removal of hardness

complete sterilisation

killing of disease bacteria

removal of turbidity

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

0.05 to 0.5 ppm

0.01 to 0.05 ppm

0.5 to 1.0 ppm

1,0 to 5.0 ppm

10. For very strong sewage, BOD will be

less than 400 mg/L

700 mg/L

more than 1500 mg/L

1000 mg/L

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

man

hydrocarbon gases

fungi

plants

12. The pipe joint commonly used in pumping stations is

spigot and socket joint

expansion joint

flanged joint

flexible joint

13. BOD stands for

biotic oxidation demand

biological oxygen demand

biochemical oxygen demand

biological oxidation demand

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

pollution

ecological disturbance

ecological degradation

catastrophe

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

minimum hourly rate of flow

average hourly rate of flow

sewer running half full

peak hourly rate of flow

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

SO₂

PAN

HC

NO₂

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

Methane and hydrogen sulphide

Carbon dioxide and hydrogen sulphide

Hydrogen sulphide and oxides of nitrogen

Sulphur dioxides and oxides of nitrogen

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

all of these

precipitation cycle

hydrological cycle

water cycle

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

0.01 ppb

0.05 ppb

0.05 ppm

0.01 ppm

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

CO

CO₂

NOx

PAN

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

Lichen

bryophyte

pteridophyte

Algae

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

safety valve

scour valve

air valve

gate valve

23. Ground water is usually free from

suspended impurities

both suspended impurities and dissolved impurities

none of these

dissolved impurities

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

Stratosphere to Mesosphere

Troposphere to Stratopause

Troposphere to Stratosphere

Tropopause to Mesosphere

25. Concentration of ozone in clean air is

0.01 ppm

0.001 ppm

0.5 ppm

0.1 ppm

26. Minamata disease was caused by pollution of water by

tin

lead

mercury

methyl isocyanate

27. 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

28. 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 ditch around the building and filling it with water

providing a steel mesh around the building

29. 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-> disinfection-> filtration

Screening-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

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

environmental lapse rate is less than adiabatic lapse rate

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

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31. A river with high BOD value is

highly clean

None of these

highly polluted

highly productive

32. The spray tower can be used to control

(a) gaseous pollutants

(c) Both (a) and (b)

(b) particle pollutants

(d) None of these

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

CO alone

O₃ and PAN

PAN and NH₃

NH₃ and CO

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

potable water

dirty water

polluted water

sewer water

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

Inorganic suspended solids

Oil and grease

Dissolved organic solids

Dissolved inorganic solids

36. 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

37. The pipe joint commonly used in pumping stations is

flexible joint

spigot and socket joint

expansion joint

flanged joint

Environmental Engineering Part 3

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