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JAMB Physics 1994 Question 21

Question 21

Gas Laws

A motor tyre is inflated to pressure of 2.0 × 105 N m−2 when the temperature of air is 27°C. What will be the pressure in it at 87°C assuming that the volume of the tyre does not change?

  1. A.2.6 × 105 N m−2
  2. B.2.4 × 105 N m−2
  3. C.2.2 × 105 N m−2
  4. D.1.3 × 105 N m−2
Show the answer and explanation

Answer: B (2.4 × 105 N m−2)

Explanation

At constant volume p/T is constant: p = 2.0 × 105 × 360/300 = 2.4 × 105 N m−2 (temperatures in kelvin).