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JEE Main levelSingle correct optionDifficulty 2 of 3ev124

The standard BOD test is carried out by incubating the sample for:

A3 days at 37 $^{\circ}$ C
B20 days at 5 $^{\circ}$ C
C5 days at 20 $^{\circ}$ C
D5 hours at 100 $^{\circ}$ C

Answer: C

By convention BOD is the oxygen consumed in 5 days at 20

^{\circ}

C, the standard BOD

_{5}

. The dissolved oxygen is measured before and after incubation.

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