If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A.

800kgm3

B.

1200kgm3

C.

1250kgm3

D.

2000kgm3

Correct answer is A

R.d = \(\frac{0.4}{0.5}\) = 0.8

0.8 = \(\frac{\text {Density of oil}}{\text{Density of water}}\)

0.8 = \(\frac{\text {Density of oil}}{1000}\)

Density of oil = 800kgm3