As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

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Environmental Engineering in CE
Main pollutants released from petroleum refineries is

SO₃, NO₂ & CO₂

CO₂, H₂S & NO₂

CO₂, NO & SO₃

CO, SO₂ & H₂S

SO₃, NO₂ & CO₂

CO₂, H₂S & NO₂

CO₂, NO & SO₃

CO, SO₂ & H₂S

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Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Active carbon

Pulverised limestone

Silica gel

Bog iron (iron oxide)

Active carbon

Pulverised limestone

Silica gel

Bog iron (iron oxide)

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Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Imhoff tank

Skimming tank

Lagoon

Oxidation

Imhoff tank

Skimming tank

Lagoon

Oxidation

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Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Biological decay of vegetable matter

None of these

Photochemical oxidation of organic matter

Volcanic eruptions and lightening discharges

Biological decay of vegetable matter

None of these

Photochemical oxidation of organic matter

Volcanic eruptions and lightening discharges

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Environmental Engineering in CE
Exposure to SO₂ containing chimney gases results in the

Reduction in strength of leather & cloth

Acceleration of corrosion rates of metals

All of these

Increased drying & hardening time of paints

Reduction in strength of leather & cloth

Acceleration of corrosion rates of metals

All of these

Increased drying & hardening time of paints

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Environmental Engineering in CE

Environmental Engineering in CE As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is

Environmental Engineering in CE Main pollutants released from petroleum refineries is

Environmental Engineering in CE Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Environmental Engineering in CE A shallow pond in which the sewage is retained and biologically treated is called

Environmental Engineering in CE Which of the following is not a natural source of air pollution?

Environmental Engineering in CE Exposure to SO₂ containing chimney gases results in the

Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

Environmental Engineering in CE
Main pollutants released from petroleum refineries is

Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Environmental Engineering in CE
Exposure to SO₂ containing chimney gases results in the