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4. A vessel contains oil

(density = 0.8 gm/cm3) over mercury (density = 13.6 gm/cm3). A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere in gm/cm3 is

(a)  3.3                                      (b)   6.4

(c)   7.2                                      (d)  12.8

Answer-c

(36)

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