Question

For how long and at what temperature an experiment is run to determine the value of BOD of a water body?

• A. ${10}^{o}C$ for 10 days
• B. ${20}^{o}C$ for 5 days
• C. ${20}^{o}C$ for 2 days
• D. $5^{o}C$ for 20 days

Answer 1

The correct option is B ${20}^{o}C$ for 5 days

BOD or biochemical oxygen demand is the amount of dissolved oxygen which is required by the aerobic organisms during the decomposition of organic matter. The BOD is measured at a specific temperature and specific period of time. BOD value is represented in the form of oxygen which is consumed per litre of the sample used for testing. The sample is tested before and after 5 days of incubation at 20 °C. The value describes the amount of organic material present in the contaminated or waste water.

Thus, the correct answer is option B.