Environmental Engineering Part 3

Page 1 of 4

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

1,0 to 5.0 ppm

0.5 to 1.0 ppm

0.05 to 0.5 ppm

0.01 to 0.05 ppm

2. 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

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

ecological disturbance

pollution

ecological degradation

catastrophe

4. BOD stands for

biotic oxidation demand

biological oxidation demand

biochemical oxygen demand

biological oxygen demand

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

1.5 mg/litre

5 mg/litre

10 mg/litre

0.1 mg/litre

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

causes blindness

is carcinogenic in nature

combines with haemoglobin

affects our sense of smell

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

safety valve

gate valve

air valve

scour valve

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

HC

PAN

NO₂

SO₂

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

Oil and grease

Dissolved inorganic solids

Inorganic suspended solids

Dissolved organic solids

10. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

expansion joint

spigot and socket joint

Page 2 of 4

11. Broadly speaking, water is

800 times less compressible than steel

10 times more compressible than steel

80 times more compressible than steel

80 times less compressible than steel

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

PAN

CO₂

NOx

CO

13. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

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

hydrocarbon gases

plants

man

fungi

15. Disinfection of water results in

killing of disease bacteria

complete sterilisation

removal of turbidity

removal of hardness

16. For very strong sewage, BOD will be

1000 mg/L

more than 1500 mg/L

less than 400 mg/L

700 mg/L

17. Ground water is usually free from

both suspended impurities and dissolved impurities

suspended impurities

dissolved impurities

none of these

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

PAN

NO_x

HC

NO₂

19. A river with high BOD value is

highly productive

highly clean

None of these

highly polluted

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

sewer running half full

peak hourly rate of flow

minimum hourly rate of flow

average hourly rate of flow

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

Lichen

bryophyte

Algae

pteridophyte

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1 and 2

2 and 3

1,2, 3 and 4

1, 3 and 4

23. 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

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

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

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

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

chemical water

gravity water

capillary water

hydroscopic water

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

all of these

precipitation cycle

water cycle

hydrological cycle

27. Concentration of ozone in clean air is

0.001 ppm

0.1 ppm

0.01 ppm

0.5 ppm

28. Minamata disease was caused by pollution of water by

mercury

methyl isocyanate

lead

tin

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

Troposphere to Stratopause

Stratosphere to Mesosphere

Troposphere to Stratosphere

Tropopause to Mesosphere

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

decreasing the surface area of tank

decreasing the depth of tank

increasing the surface area of tank

increasing the depth of tank

Page 4 of 4

31. The pipe joint commonly used in pumping stations is

expansion joint

flexible joint

flanged joint

spigot and socket joint

32. 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

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

NH₃ and CO

PAN and NH₃

CO alone

O₃ and PAN

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

sewer water

dirty water

potable water

polluted water

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

0.05 ppm

0.01 ppm

0.01 ppb

0.05 ppb

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

air relief valve

sluice valve

reflux valve

pressure relief valve

37. The spray tower can be used to control

(b) particle pollutants

(c) Both (a) and (b)

(d) None of these

(a) gaseous pollutants

Environmental Engineering Part 3

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