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JAMB Physics 1990 Question 14

Question 14

Density and Upthrust

40 m3 of liquid P is mixed with 60 m3 of another liquid Q. If the density of P and Q are 1.00 kg m−3 and 1.6 kg m−3 respectively, what is the density of the mixture?

  1. A.0.05 kg m−3
  2. B.1.25 kg m−3
  3. C.1.30 kg m−3
  4. D.1.36 kg m−3.
Show the answer and explanation

Answer: D (1.36 kg m−3.)

Explanation

Total mass = 40 × 1.00 + 60 × 1.6 = 136 kg in 100 m3, so the density is 1.36 kg m−3.