The best process of disinfection of public water supply, is by (A) Boiling (B) Chlorination (C) Adding lime (D) Adding ozone

The best process of disinfection of public water supply, is by 

(A) Boiling 

(B) Chlorination 

(C) Adding lime 

(D) Adding ozone 

by

1 Answer

Answer :

(B) Chlorination 

by

Related questions

The temporary hardness of water can be removed by (A) Boiling (B) Adding lime (C) Adding alum (D) Filtration

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Last Answer : (A) Boiling

Disinfection of water with ozone is not good because (A) It vanishes before water reaches the consumers (B) It removes the colour, taste and odour from water as bacterias (C) It adds taste to the water(D) It is more efficient than chlorine in killing bacterias

Description : Disinfection of water with ozone is not good because  (A) It vanishes before water reaches the consumers  (B) It removes the colour, taste and odour from water as bacterias  (C) It adds taste to the water (D) It is more efficient than chlorine in killing bacterias 

Last Answer : (D) It is more efficient than chlorine in killing bacterias 

'Chlorination' is 1. A process of converting chlorides into chlorine 2. Adding small amounts of chlorine to impure water 3. A chemical reaction in which chlorine is formed 4. An addition reaction of ethylene and chlorine The correct statements are: (a) 1 and 4 (b) 2 and 4 (c) 3 and 4 (d) 1 and 2

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Last Answer : Ans:(b)

Iron and manganese present as pollutants in water cannot be re-moved by - (1) oxidation followed by settling and filtration (2) chlorination (3) ion exchange process (4) lime soda process or manganese zeolite process

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Last Answer : (2) chlorination Explanation: Water chlorination is the process of adding chlorine or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is ... is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.

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Last Answer : (D) Chlorination

Iron and manganese present as pollutants in water cannot be removed by_____ (1) oxidation followed by settling and filtration (2) chlorination (3) ion exchange process (4) lime soda process or manganese zeolite process

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Last Answer : chlorination

Dissolved carbon dioxide, can be removed from the supply main by (A) Sedimentation (B) Aeration (C) Chlorination (D) Coagulation

Description : Dissolved carbon dioxide, can be removed from the supply main by (A) Sedimentation (B) Aeration (C) Chlorination (D) Coagulation

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Permanent hardness of water can be removed by (A) Adding alum (B) Adding lime (C) Adding chlorine (D) Zeolite process

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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)

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Last Answer : (D) All (A), (B) & (C)

Salmonellae can also be killed by A- Pasteurization B- Chlorination C- .boiling D- all of these

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Lime putty (A) Is made from hydraulic lime (B) Is made by adding lime to water (C) Can be used only upto three days (D) All of above

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Hydraulic lime is obtained by (A) Burning of lime stone (B) Burning of kankar (C) Adding water to quick lime (D) Calcination of pure clay

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Standard process of chlorination of water, is done by (A) Plain chlorination (B) Pre-chlorination (C) Post-chlorination (D) Double chlorination

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Last Answer : (C) Post-chlorination

Workability improved by adding (A) Fly ash (B) Hydrated lime (C) Calcium chloride (D) All the above

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The workability of concrete can be improved by adding (a) Hydrated lime (b) Fly ash (c) Calcium chloride (d) All the above

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Pick up the correct statement from the following: (A) Due to boiling, the bacterias present in water can be destroyed (B) Lime may be used for softening hard water (C) Excess lime when added to water, raises the pH value of water (D) All the above

Description : Pick up the correct statement from the following:  (A) Due to boiling, the bacterias present in water can be destroyed  (B) Lime may be used for softening hard water  (C) Excess lime when added to water, raises the pH value of water  (D) All the above 

Last Answer : (D) All the above 

Disinfection of drinking water, is done to remove (A) Odour (B) Bacterias (C) Turbidity (D) Colour

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Last Answer : (B) Bacterias

Disinfection of drinking water is done to remove (A) Turbidity (B) Odour (C) Colour (D) Bacterias

Description : Disinfection of drinking water is done to remove (A) Turbidity (B) Odour (C) Colour (D) Bacterias

Last Answer : (D) Bacterias

Raw water treated with only chlorine, is known as (A) Plain chlorination (B) Pre-chlorination (C) First-chlorination (D) De-chlorination

Description : Raw water treated with only chlorine, is known as (A) Plain chlorination (B) Pre-chlorination (C) First-chlorination (D) De-chlorination

Last Answer : (A) Plain chlorination

Chlorination of water does not remove (A) Ammonia content (B) B.O.D. (C) Organic matter content (D) Dissolved oxygen

Description : Chlorination of water does not remove (A) Ammonia content (B) B.O.D. (C) Organic matter content (D) Dissolved oxygen

Last Answer : (D) Dissolved oxygen

For plain chlorination of water, the quantity of chlorine used, is (A) 0.1 mg/litre (B) 0.2 mg/litre (C) 0.3 mg/litre (D) 0.5 mg/litre

Description : For plain chlorination of water, the quantity of chlorine used, is (A) 0.1 mg/litre (B) 0.2 mg/litre (C) 0.3 mg/litre (D) 0.5 mg/litre

Last Answer : (D) 0.5 mg/litre

During treatment of water, sedimentation is done (A) Before filtration (B) After filtration (C) Simultaneously with filtration (D) Along with chlorination

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The most commonly used chemical for de-chlorination of water, is (A) Sodium thiosulphate (B) Sodium bisulphate (C) Sodium sulphite (D) Sulphur-dioxide

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Plain chlorination is used for water (A) Obtained from clear lakes (B) Consumed during emergencies (C) Supplies to armies during war (D) All the above

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Which of the following reasons are responsible for adoption of post-chlorination of water? 1. Chlorine demand is reduced. 2. Possibility of taste and odour formation is reduced. 3. Possibility of carcinogenic compounds is reduced. 4. Chloramines are formed. (a) 1, 2, 3 & 4 (b) 1, 2 & 3 only (c) 1, & 4 only (d) 2, 3 & 4 only

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Last Answer : (c) 1, & 4 only

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De-chlorination is followed by (A) Post-chlorination (B) Pre-chlorination (C) Double-chlorination (D) Super-chlorination

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At break point of chlorination, (A) Chlorine is used to oxidise (B) Residual chloride is zero (C) Residual chloride is maximum (D) Residual chlorine reappears

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In water treatment, alum [Al2 (SO4 )3 ] is used for the process of (A) Filtration (B) Coagulation (C) Sedimentation (D) Disinfection

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