Environmental Engineering Sheet 9
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1) Question.
The construction of impounding r eservoir is required when
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2) Question.
Which one of the following solid waste disposal methods is ecologically most acceptable?
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3) Question.
A polluted stream undergoes self-purification in four distinct zones:
1. Zone of clear water
2. Zone of active decompositon
3. Zone of degradation
4. Zone of recovery
The correct sequence of these zones is
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4) Question.
When two indentical certifugal pumps are operating in series on a common rising main, then
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5) Question.
Electrical conductivity (EC) of water and total dissolved solids (TDS) are interrelated. The value of EC will
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6) Question.
If the total hardness and alkalinity of a sample of water are 300 mg/I and 100 mg/I respectively, then its carbonate and non-carbonate hardness (in units of mg/I) will be respectively
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7) Question.
Two reservoirs at different levels are connected by two parallel pipes of diameter 2d and d. The ratio of the flows in the two pipes (large : smaller) is
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8) Question.
Area method of land filling is most suitable when
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9) Question.
Coal based thermal power stations pollute the atmosphere by adding
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10) Question.
Traps are use in household drainage systems to
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11) Question.
The method adopted for removing, bushes branches, debris etc from water is called -
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12) Question.
Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be -
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13) Question.
Copper sulphate is the most common chemical used for controlling -
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14) Question.
The total count of bacteria per cubic centimetre for domestic purposes varies from -
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15) Question.
Bacterias which cause disease are called -
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16) Question.
The bacteria which can survive without oxygen is called -
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17) Question.
The bacteria which require oxygen for their survival is known as -
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18) Question.
Membrane filter technique is used for testing -
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19) Question.
B-coli or E-coli are harmless organisms but their presence in water indicates the -
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20) Question.
Sphere shaped bacterias are called -
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