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JAMB Physics 1981 Question 50

Question 50

Density and Upthrust

A solid weighs 4.8 g in air, 2.8 g in water and 3.2 g in kerosine. The ratio of density of the solid to that of the kerosine is

  1. A.12
  2. B.3
  3. C.2
  4. D.3/2
  5. E.5/4
Show the answer and explanation

Answer: B (3)

Explanation

Relative density of solid = 4.8/(4.8 − 2.8) = 2.4. Relative density of kerosine = (4.8 − 3.2)/(4.8 − 2.8) = 0.8. Ratio = 2.4/0.8 = 3.