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JAMB Physics 1980 Question 30

Question 30

Density and Upthrust

The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425 kg and can displace 50 × 10−6 m3 of water is made of

  1. A.zinc
  2. B.brass
  3. C.copper
  4. D.gold
  5. E.silver.
Show the answer and explanation

Answer: B (brass)

Explanation

Density = 0.425 ÷ (50 × 10−6) = 8500 kg m−3, a relative density of 8.5, which is brass.