An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is
-
A.
7.2kg -
B.
33.2kg -
C.
43.2kg -
D.
53.2kg
Correct Answer: Option C
Explanation
R.d = (frac{text {density of petrol}}{text{density of water}})
0.72 = (frac{text{density of petrol}}{1000})
Density of petrol =720kgm3
mass of petrol = 720 x 60 x 10-3
=43.2kg