Discussion
Five days BOD is taken at a temperature of :
Answer: D
The five-day BOD test is run at 20°C.
The standard BOD5 test incubates the sample in the dark at 20°C for five days and measures the dissolved oxygen consumed by microbes oxidising the organic matter. Fixing the temperature matters because microbial rates roughly double for every 10°C rise, so results at different temperatures cannot be compared.
Indian practice also uses a three-day BOD at 27°C, but that is not the five-day test. At 0°C, 5°C or 15°C the microbes would work too slowly to give the standard figure.
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