Environmental Engineering Part 3

Page 1 of 4

1. The pipe joint commonly used in pumping stations is

flexible joint

spigot and socket joint

flanged joint

expansion joint

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

CO

NOx

PAN

CO₂

3. BOD stands for

biochemical oxygen demand

biotic oxidation demand

biological oxidation demand

biological oxygen demand

4. For very strong sewage, BOD will be

1000 mg/L

less than 400 mg/L

more than 1500 mg/L

700 mg/L

5. 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

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

Methane and hydrogen sulphide

Sulphur dioxides and oxides of nitrogen

Hydrogen sulphide and oxides of nitrogen

Carbon dioxide and hydrogen sulphide

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

NO₂

HC

PAN

SO₂

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

decreasing the depth of tank

increasing the surface area of tank

decreasing the surface area of tank

increasing the depth of tank

9. Disinfection of water results in

killing of disease bacteria

removal of turbidity

removal of hardness

complete sterilisation

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

combines with haemoglobin

causes blindness

affects our sense of smell

is carcinogenic in nature

Page 2 of 4

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

hydroscopic water

gravity water

chemical water

capillary water

12. The pipe joint commonly used in pumping stations is

flexible joint

expansion joint

spigot and socket joint

flanged joint

13. Minamata disease was caused by pollution of water by

lead

mercury

tin

methyl isocyanate

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

safety valve

gate valve

scour valve

air valve

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

Oil and grease

Dissolved organic solids

Inorganic suspended solids

Dissolved inorganic solids

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

0.5 to 1.0 ppm

0.01 to 0.05 ppm

1,0 to 5.0 ppm

0.05 to 0.5 ppm

17. The spray tower can be used to control

(c) Both (a) and (b)

(b) particle pollutants

(a) gaseous pollutants

(d) None of these

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

pteridophyte

bryophyte

Lichen

Algae

19. 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 ditch around the building and filling it with water

providing a steel mesh around the building

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

0.1 mg/litre

5 mg/litre

10 mg/litre

1.5 mg/litre

Page 3 of 4

21. A river with high BOD value is

highly productive

highly clean

highly polluted

None of these

22. Concentration of ozone in clean air is

0.01 ppm

0.5 ppm

0.001 ppm

0.1 ppm

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

all of these

water cycle

precipitation cycle

hydrological cycle

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

Tropopause to Mesosphere

Stratosphere to Mesosphere

Troposphere to Stratopause

Troposphere to Stratosphere

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

polluted water

sewer water

potable water

dirty water

26. 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, 3 and 4

1,2, 3 and 4

27. 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-> sedimentation-> disinfection-> filtration

Screening-> filtration-> sedimentation->disinfection

Screening->disinfection->sedimentation-> filtration

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

0.01 ppb

0.01 ppm

0.05 ppb

0.05 ppm

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

HC

PAN

NO₂

NO_x

30. 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

Page 4 of 4

31. Ground water is usually free from

none of these

dissolved impurities

both suspended impurities and dissolved impurities

suspended impurities

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

sluice valve

reflux valve

pressure relief valve

air relief valve

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

maximum mixing depth is equal to zero

environmental lapse rate is equal to adiabatic lapse rate

environmental lapse rate is less than adiabatic lapse rate

environmental lapse rate is greater than adiabatic lapse rate

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

ecological degradation

pollution

catastrophe

ecological disturbance

35. Two primary air pollutants are

sulphur dioxide and hydrocarbon

ozone and peroxyacetyl nitrate

sulphur dioxide and ozone

nitrogen oxide and peroxyacetyl nitrate

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

NH₃ and CO

PAN and NH₃

O₃ and PAN

CO alone

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

plants

man

hydrocarbon gases

fungi

Environmental Engineering Part 3

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Environmental Engineering Part 3

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection