Environmental Engineering Part 3

Page 1 of 4

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

pressure relief valve

sluice valve

reflux valve

air relief valve

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

providing a ditch around the building and filling it with water

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

providing a thick bush around the building

providing a steel mesh around the building

3. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

spigot and socket joint

expansion joint

4. Disinfection of water results in

killing of disease bacteria

removal of hardness

removal of turbidity

complete sterilisation

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

affects our sense of smell

causes blindness

combines with haemoglobin

is carcinogenic in nature

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

Dissolved inorganic solids

Dissolved organic solids

Inorganic suspended solids

Oil and grease

7. Broadly speaking, water is

80 times more compressible than steel

10 times more compressible than steel

80 times less compressible than steel

800 times less compressible than steel

8. 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

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

0.05 ppb

0.01 ppm

0.01 ppb

0.05 ppm

10. 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

0.5 to 1.0 ppm

1,0 to 5.0 ppm

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

potable water

dirty water

sewer water

polluted water

12. 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

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

Screening-> sedimentation-> filtration-> disinfection

Screening-> filtration-> sedimentation->disinfection

Screening->disinfection->sedimentation-> filtration

Screening-> sedimentation-> disinfection-> filtration

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

ecological degradation

ecological disturbance

catastrophe

pollution

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

SO₂

PAN

NO₂

HC

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

environmental lapse rate is greater than adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is equal to adiabatic lapse rate

maximum mixing depth is equal to zero

17. BOD stands for

biochemical oxygen demand

biotic oxidation demand

biological oxidation demand

biological oxygen demand

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

1.5 mg/litre

5 mg/litre

10 mg/litre

0.1 mg/litre

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

minimum hourly rate of flow

peak hourly rate of flow

average hourly rate of flow

sewer running half full

20. A river with high BOD value is

highly polluted

None of these

highly productive

highly clean

Page 3 of 4

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

gate valve

safety valve

air valve

scour valve

22. The pipe joint commonly used in pumping stations is

flanged joint

flexible joint

expansion joint

spigot and socket joint

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

PAN

NOx

CO

CO₂

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

O₃ and PAN

NH₃ and CO

CO alone

PAN and NH₃

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

pteridophyte

bryophyte

Algae

Lichen

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

Tropopause to Mesosphere

Troposphere to Stratosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

27. Concentration of ozone in clean air is

0.5 ppm

0.1 ppm

0.001 ppm

0.01 ppm

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

plants

fungi

hydrocarbon gases

man

29. For very strong sewage, BOD will be

700 mg/L

less than 400 mg/L

1000 mg/L

more than 1500 mg/L

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

1,2, 3 and 4

2 and 3

1, 3 and 4

1 and 2

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31. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

sulphur dioxide and hydrocarbon

sulphur dioxide and ozone

ozone and peroxyacetyl nitrate

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

water cycle

precipitation cycle

all of these

hydrological cycle

33. Minamata disease was caused by pollution of water by

tin

mercury

methyl isocyanate

lead

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

NO_x

HC

PAN

NO₂

35. The spray tower can be used to control

(a) gaseous pollutants

(d) None of these

(c) Both (a) and (b)

(b) particle pollutants

36. Ground water is usually free from

dissolved impurities

none of these

both suspended impurities and dissolved impurities

suspended impurities

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

capillary water

gravity water

hydroscopic water

chemical water

Environmental Engineering Part 3

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