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49.

The layout of distribution system in which water flows towards the outer periphery is                        
A. ring system B. dead end system
C. radial system D. grid iron system



50.

The length of rectangular sedimentation tank should not be more than
where B is the width of the tank                        
A. B B. 2B
C. 4B D. 8B



51.

The main disadvantage of cement concrete sewers is                        
A. less strength B. difficulty in construction
C. difficulty in transportation due to heavy weight D. less life




52.

The major disadvantage of lime soda process of water softening is that                        
A. it is unsuitable for turbid and acidic water B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness D. it is unsuitable for softening the water of excessive hardness



53.

The maximum discharge of a tube-well is about                        
A. 5 litres/sec B. 50 litres/sec
C. 500 litres/sec D. 1000 litres/see



54.

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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