A. Coagulation
B. Sterilisation
C. Disinfection
D. Sedimentation
Related Mcqs:
- The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
A. Dissolved oxygen content
B. Biological oxygen demand
C. Vapor pressure
D. All A., B. and C. - 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 A., B. & C. - 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) - In water treatment plant, zeolite process is used to remove the _____________ of water?
A. Acidity
B. Alkalinity
C. Hardness
D. Iron & zinc - The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
A. Decreases
B. Increases
C. Remain constant
D. May increase or decrease; depends on the chemical characteristics of polluted water - Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?
A. Coal ash
B. Potassium cyanide
C. Ortho-xylene
D. None of these - 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 - Infective bacteria in water is killed by the _____________ process?
A. Sterilisation
B. Aeration
C. Disinfection
D. None of these - In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection - ____________ is removed from water by lime-soda process?
A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness
