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Friday, 30 October 2026
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Physics Past Questions and Answers

Jamb 1990 Physics Questions

Question 11:
The resistances of platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm
  • A 43.0<sup style='font-size: smaller;'>o</sup>C
  • B 50.0<sup style='font-size: smaller;'>o</sup>C
  • C 69.9<sup style='font-size: smaller;'>o</sup>C
  • D 87.0<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 12:
A bar of initial length /0 is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is
  • A \(\frac{/ - /_o}{/ \Delta t}\)
  • B \(\frac{/ - /_o}{/_o \Delta t}\)
  • C /<sub style='font-size: smaller;'>o</sub>(1 + \(\Delta\) t)
  • D \(\frac{/ - /_o}{/(1 + \Delta t)}\)
View Answer & Explanation
Question 13:
The pressure of a gas when cooled at constant volume will decrease because the molecules
  • A Collide less frequently with the walls of the container
  • B Have the same average kinetic energy
  • C Break up into smaller molecules
  • D Decrease in number
View Answer & Explanation
Question 14:
1kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [specific heat capacity of copper 400Jkg-1K-1 and latent heat of fusion of ice 333 x 103Jkg-1]
  • A 60g
  • B 67g
  • C 120g
  • D 133g
View Answer & Explanation
Question 15:
Which of the following conditions will make water boil at a temperature of 100oC when the atmospheric pressure is 750mmHg?
  • A Increase the external pressure
  • B Reduce the external pressure
  • C Heat more rapidly at the same pressure
  • D Reduce the external pressure by a quarter
View Answer & Explanation