Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
The most common cause of acidity in water is_______________?
The percentage of chlorine in fresh bleaching powder is about________________?
Chlorine demand of water is equal to________________?
The rate of Alteration of pressure filters is_________________?
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
The effective size of sand particles used in slow sand filters is_______________?
In water treatment, rapid gravity filters are adopted to remove_______________?
The alum, when added as a coagulant in water_______________?
