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13. A block of steel of size 5 cm × 5 cm × 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is

(a)   6 × 5 × 5 × 5 gf                              (b)   4 × 4 × 4 × 7 gf

(c)   5 × 5 × 5 × 7 gf                              (d)   4 × 4 × 4 × 6 gf

Answer-a

(5)

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