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JAMB Physics 2010 Question 17

Question 17

Density and Upthrust

The density of a certain oil on frying becomes 0.4 kgm−3 with a volume of 20 m3. What will be its initial volume when its initial density is 0.8 kgm−3 assuming no loss of oil due to spillage?

  1. A.10 kgm−3
  2. B.5 kgm−3
  3. C.8 kgm−3
  4. D.12 kgm−3
Show the answer and explanation

Answer: A (10 kgm−3)

Explanation

Mass = density × volume = 0.4 × 20 = 8 kg, and the mass does not change. Initial volume = 8 ÷ 0.8 = 10 m3.