Environmental Engineering Part 3

Page 1 of 4

1. Concentration of ozone in clean air is

0.001 ppm

0.01 ppm

0.5 ppm

0.1 ppm

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

0.01 ppm

0.01 ppb

0.05 ppm

0.05 ppb

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

Algae

Lichen

pteridophyte

bryophyte

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

capillary water

gravity water

chemical water

hydroscopic water

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

minimum hourly rate of flow

peak hourly rate of flow

sewer running half full

average hourly rate of flow

6. Disinfection of water results in

removal of hardness

removal of turbidity

complete sterilisation

killing of disease bacteria

7. A river with high BOD value is

highly polluted

highly productive

None of these

highly clean

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

Troposphere to Stratopause

Tropopause to Mesosphere

Stratosphere to Mesosphere

Troposphere to Stratosphere

9. 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

10. The pipe joint commonly used in pumping stations is

spigot and socket joint

flexible joint

expansion joint

flanged joint

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11. Ground water is usually free from

suspended impurities

dissolved impurities

none of these

both suspended impurities and dissolved impurities

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

0.1 mg/litre

10 mg/litre

5 mg/litre

1.5 mg/litre

13. Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinking purpose?

Screening-> filtration-> sedimentation->disinfection

Screening-> sedimentation-> disinfection-> filtration

Screening-> sedimentation-> filtration-> disinfection

Screening->disinfection->sedimentation-> filtration

14. Minamata disease was caused by pollution of water by

tin

lead

mercury

methyl isocyanate

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1 and 2

1,2, 3 and 4

2 and 3

1, 3 and 4

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

man

fungi

hydrocarbon gases

plants

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

HC

SO₂

NO₂

PAN

18. For very strong sewage, BOD will be

more than 1500 mg/L

700 mg/L

1000 mg/L

less than 400 mg/L

19. BOD stands for

biotic oxidation demand

biological oxygen demand

biological oxidation demand

biochemical oxygen demand

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

environmental lapse rate is less than adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

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

all of these

precipitation cycle

hydrological cycle

water cycle

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

providing a thick bush around the building

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

providing a steel mesh around the building

providing a ditch around the building and filling it with water

23. 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

is carcinogenic in nature

causes blindness

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

Hydrogen sulphide and oxides of nitrogen

Carbon dioxide and hydrogen sulphide

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

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

NOx

CO₂

PAN

CO

26. The spray tower can be used to control

(c) Both (a) and (b)

(b) particle pollutants

(d) None of these

(a) gaseous pollutants

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

dirty water

potable water

sewer water

polluted water

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

PAN

HC

NO₂

NO_x

29. The pipe joint commonly used in pumping stations is

spigot and socket joint

flexible joint

expansion joint

flanged joint

30. Broadly speaking, water is

10 times more compressible than steel

800 times less compressible than steel

80 times more compressible than steel

80 times less compressible than steel

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

sluice valve

air relief valve

pressure relief valve

reflux valve

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

scour valve

safety valve

gate valve

air valve

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

O₃ and PAN

CO alone

PAN and NH₃

NH₃ and CO

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

decreasing the depth of tank

decreasing the surface area of tank

increasing the surface area of tank

increasing the depth of tank

35. 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

0.05 to 0.5 ppm

0.5 to 1.0 ppm

36. Two primary air pollutants are

ozone and peroxyacetyl nitrate

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

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

ecological disturbance

ecological degradation

pollution

catastrophe

Environmental Engineering Part 3

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