Q:

A sample of water taken from a water storage tank of a residential area was to be examined bacteriologically. A positive test of water sample by multiple tube method refers to the presence of

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A sample of water taken from a water storage tank of a residential area was to be examined bacteriologically. A positive test of water sample by multiple tube method refers to the presence of


  1. Coli-form organisms
  2. Fecal streptococci
  3. Nitrites
  4. Cl. Perfringens
  5. Fungi

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a) Coli-form organisms

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