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JAMB Physics 1988 Question 14

Question 14

Density and Upthrust

A body whose mass is 2 kg and has a volume of 500 cm3 just floats when completely immersed in a liquid. Calculate the density of the liquid.

  1. A.4.0 × 102 kg m−3
  2. B.4.0 × 103 kg m−3
  3. C.1.0 × 103 kg m−3
  4. D.1.0 × 106 kg m−3.
Show the answer and explanation

Answer: B (4.0 × 103 kg m−3)

Explanation

It just floats when fully immersed, so the liquid's density equals the body's: 2 ÷ (500 × 10−6) = 4.0 × 103 kg m−3.