Water Supply Engineering

81. For least effect on the water table, the tube wells must be dug one in every

1. 0.5 sq km
2. 0.75 sq km
3. 1.0 sq km
4. 1.5 sq km

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82. For maximum alkalinity of water, pH value should be

1. Zero
2. Less than 7
3. More than 7
4. 14

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83. For plain chlorination of water, the quantity of chlorine used, is

1. 0.1 mg/litre
2. 0.2 mg/litre
3. 0.3 mg/litre
4. 0.5 mg/litre

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84. For the prediction of future population of a city, the factor to be considered, is

1. Births
2. Deaths
3. Migrants
4. All the above

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85. For the same draw down in two observations wells at distances r₁ and r₂, the times after start of pumping are t₁ and t₂ hours respectively. The relation which holds good is

1. t₂ = r₂/r × t₁
2. t₂ = (r₂/r)² × t₁
3. t₂ = (r₂/r)³ × t₁
4. t₂ = (r₂/r) × t1₁

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86. From the surface of reservoir, evaporation may be minimised by sprinkling

1. Spirit
2. Hydrochloric acid
3. Acetyl alcohol
4. Methane

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87. Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of

1. Increasing
2. Decreasing
3. Constant
4. All the above

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88. Grade aqueducts are not allowed to run

1. Full
2. ¾th full
3. ½full
4. ¼th full

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89. Gravity conduits

1. Carry water under gravity
2. Follow the hydraulic gradient line
3. Are carried through tunnels in deep cuttings
4. All the above

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90. Gravity conduits are generally in the form of

1. Canals
2. Flumes
3. Aqueduct
4. All the above

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