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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a