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MCQs 1: The hourly variation factor is usually taken as______________?

1.5 1.8 2.0 2.7
Answer Explanation

MCQs 2: The distribution mains are designed for________________?

maximum daily demand maximum hourly demand average daily demand maximum hourly demand on maxi¬mum day
Answer Explanation

MCQs 3: The depression of water table in a well due to pumping will be maximum_______________?

at a distance R from the well close to the well at a distance R/2 from the well none of the above
Answer Explanation

MCQs 4: The type of valve, which is provided on the suction pipe in a tube-well, is____________?

air relief valve reflux valve pressure relief valve sluice valve
Answer Explanation

MCQs 5: As compared to shallow-wells, deep wells have______________?

more depth less depth more discharge less discharge
Answer Explanation

MCQs 6: The polluted water is one which_______________?

contains pathogenic bacteria consists of undesirable substances rendering it unfit for drinking and domestic use is safe and suitable for drinking and domestic use is contaminated
Answer Explanation

MCQs 7: The most common cause of acidity in water is_______________?

carbon dioxide oxygen hydrogen nitrogen
Answer Explanation

MCQs 8: Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

calcium carbonate magnesium carbonate sodium carbonate calcium hydroxide
Answer Explanation

MCQs 9: The maximum permissible limit for flouride in drinking water is______________?

0.1 mg/litre 1.5 mg/litre 5 mg/litre 10 mg/litre
Answer Explanation

MCQs 10: Turbidity is measured on_______________?

standard silica scale standard cobalt scale standard platinum scale platinum cobalt scale
Answer Explanation

MCQs 11: Residual chlorine in water is determined by________________?

starch iodide method orthotolidine method both (A) and (B) none of the above
Answer Explanation

MCQs 12: If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

total alkalinity total hardness total hardness – total alkalinity non carbonate hardness
Answer Explanation

MCQs 13: The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

1 mg/litre 10 mg/litre 100 mg/litre 1000 mg/litre
Answer Explanation

MCQs 14: The length of rectangular sedimentation tank should not be more than_______________?

B 2B 4B 8B
Answer Explanation

MCQs 15: Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

10 to 25 50 75 100
Answer Explanation

MCQs 16: The settling velocity of a particle in a sedimentation tank increases if______________?

particle size is decreased the surface area of tank is increased the depth of tank is decreased none of the above
Answer Explanation

MCQs 17: The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?

less and more less and less more and less more and more
Answer Explanation

MCQs 18: Alum as a coagulant is found to be most effective when pH range of water is______________?

2 to 4 4 to 6 6 to 8 8 to 10
Answer Explanation

MCQs 19: The alum, when added as a coagulant in water_______________?

does not require alkalinity in water for flocculation does not affect pH value of water increases pH value of water decreases pH value of water
Answer Explanation

MCQs 20: In water treatment, rapid gravity filters are adopted to remove_______________?

dissolved organic substances dissolved solids and dissolved gases floating solids and dissolved inorganic solids bacteria and colloidal solids
Answer Explanation

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