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Question

Water filled in two glasses A and B have BOD values of 10 and 20 respectively. Then choose the correct statement(s):

A
Amount of O2 required by bacteria to break down microorganisms present in glass A is more than that of glass B
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B
Amount of O2 required by bacteria to break down microorganisms present in glass B is more than that of glass A
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C
Glass A is more polluted than B
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D
Glass A is less polluted than B
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Solution

The correct option is D Glass A is less polluted than B
BOD :
The amount of oxygen required by bacteria to break down organic matter present in a certain volume of a sample of water.
So, amount of O2 required by bacteria to break down microorganisms present in glass B is more than that of glass A and consequently glass A is less polluted than that of B

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