Environmental Engineering

61.Foul odour and bad taste of water is removed by treating with

1. Alum
2. Bleaching powder
3. Activated carbon
4. Copper sulphate

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62.Fresh domestic sewage is _________ in color.

1. Grey
2. Dark brown
3. Red
4. Black

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63.Fresh sewage is _________ in nature.

1. Acidic
2. Neutral
3. Alkaline
4. Highly acidic

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64.From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about _________ ppm.

1. 5
2. 50
3. 500
4. 5000

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65.Global warming may result in

1. Flood
2. Cyclone
3. Decrease in food productivity
4. All (A), (B) and (C)

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66.Green house effect is accentuated by

1. Deforestation
2. Rapid industrialisation
3. Increased transportation activity
4. All (A), (B) and (C)

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67.Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?

1. CO₂
2. H₂
3. SO₃
4. N₂

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68.Growth of _________ is promoted by the presence of manganese in water.

1. Files
2. Algae
3. Micro-organisms
4. Mosquitoes

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69.H2S present in gaseous stream can be removed by adsorption on

1. Silica gel
2. Active carbon
3. Bog iron
4. Limestone powder

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70.Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of _________ metres.

1. 100
2. 1000
3. 400
4. 4000

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