A) 0.9
B) 1.2
C) 1.5
D) 1.8
Correct Answer: C
Solution :
A body floats with 40% of its volume outside water, hence fraction of the immersed part \[=f=\frac{d}{\rho }\] So, in water, \[f=1-0.4=0.6\] Hence, \[0.6=\frac{d}{1}\Rightarrow d=0.6\] In oil, the body floats with 60% of its volume outside water, hence fraction of the immersed part \[=f=1-0.6=0.4.\] So, in oil, \[f=\frac{d}{{{\rho }_{oil}}}\] \[\Rightarrow \] \[0.4=\frac{0.6}{{{\rho }_{oil}}}\Rightarrow {{\rho }_{oil}}=1.5\]
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