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WorksheetsDAY 71 WORKSHEET ITI (OUBLIC HEALTH - ACIDITY,ALKALINITY)
Total questions: 15
Worksheet time: 11mins
If water sample has total hardness less than total alkalinity, then carbonate hardness is:
Total hardness
Total alkalinity
Zero
Equal to non-carbonate hardness
A sample turns wine-red to blue using Eriochrome Black-T. The test performed was:
Turbidity test
Hardness test
Fluoride test
Sulphate test
Nitrite presence in treated water indicates:
Fully stabilized pollution
No pollution
Intermediate stage of decomposition
Only temporary hardness
If dissolved oxygen in public water supply is below 4 ppm, it implies:
Safe for aquatic life
Unsuitable and indicates sewage contamination
Indicates high alkalinity
Indicates high hardness
Which parameter cannot be corrected by boiling?
Temporary hardness
Pathogenic bacteria
Permanent hardness
Carbon dioxide acidity
Statement: Hydroxide and bicarbonate alkalinity cannot coexist in the same sample.
True
False
Statement: Fluoride above 1.5 mg/L improves teeth strength.
True
False
Assertion: Fluoride >1.5 mg/L causes mottling of teeth. Reason: Because high fluoride forms unstable fluorides in enamel.
Both A and R are true, and R explains A
Both A and R are true, but R does not explain A
A true, R false
A false, R true
The maximum permissible nitrate concentration in drinking water as per IS 10500 is (a) mg/L.
Chloride content in water is determined using (a) titration method.
The test used to estimate dissolved oxygen in water is (a) method.
Blue-baby syndrome (methemoglobinemia) is associated with excess (a) in water.
Temporary hardness in water is mainly due to carbonates and bicarbonates of Ca and Mg and can be removed by (a) .
Match the following: Hardness & Removal
A. Temporary hardness→
2. Boiling
B. Permanent hardness→
1. Demineralization
C. Zeolite process→
4. Ion-exchange softening
D. Lime soda process→
3. Only CO₂ removal
Match the following: Nitrogen Forms —
A. Ammonia nitrogen→
2. Recent pollution
B. Albuminoid nitrogen→
3. Indicates old pollution
C. Nitrite→
4. Intermediate stage of pollution
D. Nitrate→
1. Fully stabilized stage
