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A masonry dam (density = 20, 000 N/m3) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be

75 N/m2
750 N/m2
7500 N/m2
75000 N/m2

Correct Answer: 7500 N/m2

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