Related Questions

Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
A Ozone and iodine
B Chlorine or its compounds
C Ultraviolet light for irradiation of water
D All of the above
Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called
A flavoxanthin
B melanin
C carotene
D Xanthophyll
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
A Food industry
B Municipal sewage treatment
C Petroleum refinery
D Iron & steel plant
A common disinfectant used in village wells for disinfection of water is
A Free chlorine
B Bromine
C Iodine
D Potassium permanganate
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
A 0.01
B 0.1
C 0.3
D 1
Disinfection of water results in
A Removal of turbidity
B Removal of hardness
C Killing of disease bacteria
D Complete sterilisation
The suitable method for disinfection of swimming pool water is
A Ultra violet rays treatment
B Lime treatment
C By using potassium permanganate
D Chlorination
Disinfection efficiency is
A Reduced at higher pH value of water
B Unaffected by pH value of water
C Increased at higher pH value of water
D Highest at pH value equal to 7
Disinfection of drinking water, is done to remove
A odour
B bacterias
C turbidity
D colour
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
A Chlorine
B Alkalis
C Benzene hexachloride
D Alkyl benzene sulphonate (ABS)

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