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Friday, 30 October 2026
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Physics Past Questions and Answers

Jamb 1991 Physics Questions

Question 11:
A pilot records the atmospheric pressure outside its plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and that of air = 0.00013)
  • A 1200m
  • B 6300m
  • C 7500m
  • D 13800m
View Answer & Explanation
Question 12:
In which of the following is surface tension important?
  • A The floating of a ship in water
  • B The floating of a dry needle in water
  • C The floating of a baloon in air
  • D The diffusion of sugar solution across a membrane
View Answer & Explanation
Question 13:
A thermometer with an arbitrary scale S, of equal division registers -30oS at the ice point and +90oS at the steam point. Calculate the Celsius temperature corresponding to 60oS
  • A 25.0<sup style='font-size: smaller;'>o</sup>C
  • B 50.0<sup style='font-size: smaller;'>o</sup>C
  • C 66.7<sup style='font-size: smaller;'>o</sup>C
  • D 75.0<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 14:
A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10-6K-1?
  • A 2.0036m
  • B 2.0018cm
  • C 2.1800
  • D 2.0360m
View Answer & Explanation
Question 15:
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? [the specific latent heat of steam is 2,260,000Jkg-1, specific heat capacity of water is 4200Jkg-1K-1]
  • A 4200J
  • B 2,260,OOOJ
  • C 9,040,000J
  • D 9,380,000J
View Answer & Explanation