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Sunday, 01 November 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 16:
A thin aluminum plate has a surface area of 1500m[/sup] at 20[sup]oC. What will be its surface area when it is cooled to -20oC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).
  • A 1.503m<sup style='font-size: smaller;'>2</sup>
  • B 1.500m<sup style='font-size: smaller;'>2</sup>
  • C 1.498m<sup style='font-size: smaller;'>2</sup>
  • D 1.497m<sup style='font-size: smaller;'>2</sup>
  • E 1.490m<sup style='font-size: smaller;'>2</sup>
View Answer & Explanation
Question 17:
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
  • A 44<sup style='font-size: smaller;'>o</sup>C
  • B 50<sup style='font-size: smaller;'>o</sup>C
  • C 56<sup style='font-size: smaller;'>o</sup>C
  • D 60<sup style='font-size: smaller;'>o</sup>C
  • E 70<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 18:
A quantity of gas occupies a certain volume when the temperature is -73oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?
  • A 573<sup style='font-size: smaller;'>o</sup>C
  • B 327<sup style='font-size: smaller;'>o</sup>C
  • C 300<sup style='font-size: smaller;'>o</sup>C
  • D 110<sup style='font-size: smaller;'>o</sup>C
  • E 27<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 19:
In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is
  • A Force
  • B Force/m
  • C Work
  • D Force/m<sup style='font-size: smaller;'>3</sup>
  • E Energy/m<sup style='font-size: smaller;'>3</sup>
View Answer & Explanation
Question 20:
Water shows anomalous behaviour.
  • A Below 0<sup style='font-size: smaller;'>o</sup>C
  • B Between 0<sup style='font-size: smaller;'>oC and 4o</sup>C
  • C At exactly 4<sup style='font-size: smaller;'>oC</sup>
  • D Between 4<sup style='font-size: smaller;'>oC and 100oC</sup>
  • E Above 100<sup style='font-size: smaller;'>oC</sup>
View Answer & Explanation