23) If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is i) presumptive coliform test ii) confirmed coliform test iii) completed coliform test The correct answer is

24) Alkalinity in water is expressed as milli-grams per litre in terms of equivalent

25) Which of the following values of pH represents a stronger acid

26) Turbidity is measured on

27) On standard silica scale, the turbidity in drinking water should be limited to