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JAMB Physics 1982 Question 5

Question 5

Gas Laws

The tyre pressure of a car was found to be 150 cm Hg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres to 57°C. The tyre pressure had by the afternoon

  1. A.increased by 15.0 cm Hg
  2. B.decreased by 15.0 cm Hg
  3. C.increased by 22.50 cm Hg
  4. D.decreased by 22.50 cm Hg
  5. E.remained constant.
Show the answer and explanation

Answer: A (increased by 15.0 cm Hg)

Explanation

At constant volume p/T is constant: p₂ = 150 × 330/300 = 165 cm Hg, an increase of 15 cm Hg.