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The diameters of two planets are in the ratio 4 : 1 and their mean densities in the ratio 1 : 2. The acceleration due to gravity on the planets will be in ratio

(a)      1 : 2                                  (b)      2 : 3

(c)      2 : 1                                    (d)        4 : 1

Answer: c

(6)

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