Discussion
MPN test is carried out for :
Answer: A
The MPN test is carried out for Drinking water.
The Most Probable Number test is the multiple-tube fermentation method for estimating coliform bacteria. Measured volumes of the sample go into a series of lactose broth tubes; the pattern of tubes producing gas is read against statistical tables to give the most probable number of coliforms per 100 ml. Coliforms indicate faecal contamination, so the test is the standard check on the bacteriological safety of drinking water.
The same method can be applied to waste water and to dairy products, but the question takes its best-known use, the potability test. Air quality is assessed with samplers and settle plates, not with MPN tubes.
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