Question 21 : Natural zeolite are mainly processed from
1. White sand
2. Green sand
3. Grey sand
4. Red sand
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Question 22 : The total hardness of water is 100ppm as CaCO₃ equivalent. What is the type of water?
1. Soft
2. Moderately hard
3. Hard
4. Very hard
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Question 23 : In which process of water softening, ion exchange phenomenon takes place?
1. Lime soda process
2. Zeolite process
3. Boiling
4. Demineralization process
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Question 24 : Softening chemicals, lime and soda do not depend on
1. Free carbon dioxide present
2. Non carbonate hardness
3. Total magnesium
4. Carbonate hardness
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Question 25 : The permanent hardness is also known as
1. Pseudo hardness
2. Non carbonate hardness
3. Carbonate hardness
4. Brinell hardness
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Question 26 : What is the detention time of a water softening accelerator?
1. 1-6minutes
2. 20minutes
3. 30 minutes
4. 1-2hours
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Question 27 : Which filter is normally used in the lime soda treatment plant?
1. Slow sand filter
2. Rapid sand filter
3. Dual media filter
4. Mixed media filter
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Question 28 : Zeolites are complex compound of
1. Aluminium and lime
2. Silica and soda
3. Aluminium, silica and soda
4. Lime and soda
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Question 29 : The temporary hardness in water is due to the presence of
1. Sulfates, Chlorides
2. Sulfates, Chlorides, nitrates
3. Carbonates and bicarbonates
4. Sulfates and carbonates
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Question 30 : In which process of water softening, the chemicals are added to remove hardness from water?
1. Lime soda process
2. Zeolite process
3. Boiling
4. Demineralization process
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