Environmental Engineering Part 3

Page 1 of 4

1. Concentration of ozone in clean air is

0.5 ppm

0.001 ppm

0.01 ppm

0.1 ppm

2. Two primary air pollutants are

nitrogen oxide and peroxyacetyl nitrate

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

sulphur dioxide and hydrocarbon

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

scour valve

safety valve

gate valve

air valve

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

pteridophyte

Lichen

Algae

bryophyte

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

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

maximum mixing depth is equal to zero

environmental lapse rate is greater than adiabatic lapse rate

6. Minamata disease was caused by pollution of water by

tin

mercury

methyl isocyanate

lead

7. The spray tower can be used to control

(c) Both (a) and (b)

(b) particle pollutants

(a) gaseous pollutants

(d) None of these

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

increasing the surface area of tank

decreasing the surface area of tank

increasing the depth of tank

decreasing the depth of tank

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

ecological degradation

pollution

ecological disturbance

catastrophe

10. 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

Page 2 of 4

11. 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

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

Dissolved organic solids

Dissolved inorganic solids

Inorganic suspended solids

Oil and grease

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

sluice valve

reflux valve

air relief valve

pressure relief valve

14. 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 steel mesh around the building

providing a thick bush around the building

15. The pipe joint commonly used in pumping stations is

expansion joint

flexible joint

spigot and socket joint

flanged joint

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

all of these

precipitation cycle

water cycle

hydrological cycle

17. Ground water is usually free from

both suspended impurities and dissolved impurities

suspended impurities

dissolved impurities

none of these

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

gravity water

chemical water

capillary water

hydroscopic water

19. A river with high BOD value is

highly polluted

highly clean

highly productive

None of these

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

10 mg/litre

1.5 mg/litre

5 mg/litre

0.1 mg/litre

Page 3 of 4

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

NH₃ and CO

CO alone

PAN and NH₃

O₃ and PAN

22. BOD stands for

biological oxidation demand

biotic oxidation demand

biological oxygen demand

biochemical oxygen demand

23. For very strong sewage, BOD will be

more than 1500 mg/L

700 mg/L

less than 400 mg/L

1000 mg/L

24. 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

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

man

plants

fungi

hydrocarbon gases

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

0.05 ppb

0.05 ppm

0.01 ppb

0.01 ppm

27. The pipe joint commonly used in pumping stations is

flexible joint

flanged joint

spigot and socket joint

expansion joint

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

sewer water

dirty water

polluted water

potable water

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

PAN

NO₂

NO_x

HC

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

SO₂

HC

NO₂

PAN

Page 4 of 4

31. Disinfection of water results in

killing of disease bacteria

removal of turbidity

removal of hardness

complete sterilisation

32. Broadly speaking, water is

800 times less compressible than steel

80 times more compressible than steel

80 times less compressible than steel

10 times more compressible than steel

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

average hourly rate of flow

sewer running half full

peak hourly rate of flow

minimum hourly rate of flow

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

PAN

NOx

CO₂

CO

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

Troposphere to Stratopause

Troposphere to Stratosphere

Stratosphere to Mesosphere

Tropopause to Mesosphere

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

Methane
Carbon dioxide
Chlorofluorocarbons
Nitrogen oxides

2 and 3

1 and 2

1,2, 3 and 4

1, 3 and 4

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

causes blindness

affects our sense of smell

is carcinogenic in nature

combines with haemoglobin

Environmental Engineering Part 3

Related

1 Response

Leave a ReplyCancel reply

Secured Payments

Protection

Environmental Engineering Part 3

Share this Now with Friends:

Related

1 Response

Leave a ReplyCancel reply

Secured Payments

Protection