The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
A. 1 mg/litre
B. 10 mg/litre
C. 100 mg/litre
D. 1000 mg/litre
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If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
A. Total alkalinity
B. Total hardness
C. Total hardness – total alkalinity
D. Non carbonate hardness
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Residual chlorine in water is determined by________________?
A. Starch iodide method
B. Orthotolidine method
C. Both (a) and (b)
D. None of the above
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Turbidity is measured on_______________?
A. Standard silica scale
B. Standard cobalt scale
C. Standard platinum scale
D. Platinum cobalt scale
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The maximum permissible limit for flouride in drinking water is______________?
A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre
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Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
A. Calcium carbonate
B. Magnesium carbonate
C. Sodium carbonate
D. Calcium hydroxide
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The most common cause of acidity in water is_______________?
A. Carbon dioxide
B. Oxygen
C. Hydrogen
D. Nitrogen
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The polluted water is one which_______________?
A. Contains pathogenic bacteria
B. Consists of undesirable substances rendering it unfit for drinking and domestic use
C. Is safe and suitable for drinking and domestic use
D. Is contaminated
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As compared to shallow-wells, deep wells have______________?
A. More depth
B. Less depth
C. More discharge
D. Less discharge
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The type of valve, which is provided on the suction pipe in a tube-well, is____________?
A. Air relief valve
B. Reflux valve
C. Pressure relief valve
D. Sluice valve
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Word of the Day
22 Sep
Grim
very serious or gloomy.
کڑا، شدید، سخت،سنگدل

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