| Dechlorination of water is done by the use of i. activated carbon ii. sodium thiosulphate iii. sodium bisulfate |
A) Only (i)
B) (i) and (ii)
C) (ii) and (iii)
D) (i), (ii) and (iii)
| Which of the following treatments is the most economically effective method for controlling Schistosomiasis |
A) Filtration
B) Ozonation
C) Chlorination
D) UV radiation
| Which one of the following chemicals is employed for dechlorination of water? |
A) Sodium sulphite
B) Sodium bicarbonate
C) Calcium carbonate
D) Hydrogen peroxide
| Which of the following are connected to softening of the water: (i) Precipitation of magnesium hydroxide (ii) Precipitation of calcium carbonate (iii) Addition of Alum (iv) Aeration |
A) (i) & (ii)
B) (iii) & (iv)
C) (i), (ii) & (iii)
D) (i), (ii), (iii) & (iv)
| Which of the following is not an advantage of using Zeolite process over the Lime Soda Process for softening of water: |
A) The pH of the treated water remains unaltered
B) Partial bacterial disinfection
C) No post-treatment of water required
D) No formation of Sludge
| Which of this is not a minor method of disinfection of water? |
A) Treatment with Excess lime
B) Treatment with Iodine and Bromine
C) Treatment with Potassium permanganate
D) Treatment with Aluminum powder
| Which one of the following processes of softening water may require recarbonation? |
A) Lime-soda process
B) Sodium-cation exchange process
C) Demineralization process
D) Hydrogen-cation exchanges process
| Chlorides from water are removed by |
A) soda-lime process
B) reverse osmosis process
C) cation exchange process
D) chemical coagulation
| Nalgonda method of water treatment is used for removal of: |
A) Fluoride content
B) Bacterial content
C) Carbon content
D) Excess Chlorine
| Which of the following water-borne disease affec adversely the membrane covering spinal cord of human? |
A) Polio
B) Syringomyelia
C) Meningitis
D) Bifid
