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Civil Engineering Objective Questions { Water Resources Engineering }



113. Isopiastic lines are the contours
A. drawn to represent water table
B. drawn to represent piezometric heads
C. drawn to piezometric surface
D. none of these.
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114. Pick up the correct statement from the following :
A. Perched aquifer is found in unconfined aquifer
B. The top surface of the water held in the perched aquifer, is known as perched water table
C. Perched aquifer is formed in unfined accquifer if an impervious layer exists
D. All the above.
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115.  Pick up the correct statement from the following :
A. the rate of flow from a well per unit of draw-down is called specific capacity of the well
B. the volume of water that an aquifer releases per unit surface area of the aquifer per unit change in head normal to the surface, is called the storage coefficient
C. Infiltration wells are shallow wells constructed along the banks of rivers to collect the river water seeping through the river
D. all the above.
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116. According to Thiem, the permeability of an aquifer may be obtained from the equation the following assumption is not applicable
A. The aquifer is homogeneous and isotropic
B. Flow lines are radial and horizontal
C. The slope of the water surface is too small
D. None of these.
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117.  The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. The total height of confined aquifer H is given by
A. H = h2 - hi
B. H = hi - h2
C. H = h2 + hi
D. (h1 + h2).
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118. The Dupuit formula is based on
A. one observation well
B. two observation wells
C. three observation wells
D. no observation well
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119. The radius of influence is
A. radius of the main well
B. distance from the wall of main well to the point of zero draw down
C. distance from the centre of main well to the point of zero draw down
D. none of these.
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