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Unilorin Post-UTME Physics 2021 (Model questions) Question 3

Question 3

Density and Upthrust

A liquid of volume 2.00m3 and density 1.00 x 103kgm−3 is mixed with 3.00 m3 of another liquid of density 8.00 x 102 kg m−3. Calculate the density of the mixture. [Assume there is no chemical reaction].

  1. A.5.20 x 102 kg m−3
  2. B.8.80 x 102kg m−3
  3. C.1.13 x 103kg m−3
  4. D.5.20 x 103 kgm−3
Show the answer and explanation

Answer: B (8.80 x 102kg m−3)

Explanation

Masses: 2 × 1000 = 2000 kg and 3 × 800 = 2400 kg. Density = 4400 kg ÷ 5 m3 = 880 kg m−3 = 8.80 × 102 kg m−3.