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Tuesday, 19 May 2026
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Physics Past Questions and Answers

Jamb 1987 Physics Questions

Question 11:
A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?
  • A 1.12cm
  • B 2.14cm
  • C 2.24cm
  • D 2.52cm
View Answer & Explanation
Question 12:
A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?
  • A 0.125cm<sup style='font-size: smaller;'>-1</sup>
  • B 0.250gcm<sup style='font-size: smaller;'>-1</sup>
  • C 0.625cm<sup style='font-size: smaller;'>-1</sup>
  • D 2.500cm<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 13:
The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?
  • A 22.5<sup style='font-size: smaller;'>o</sup>C
  • B 29.0<sup style='font-size: smaller;'>o</sup>C
  • C 90.0<sup style='font-size: smaller;'>o</sup>C
  • D 100.0<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 14:
The length of a side of a metallic cube at 20oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10-5k-1, find the volume of the cube at 120oC .
  • A 126.50cm<sup style='font-size: smaller;'>3</sup>
  • B 126.25cm<sup style='font-size: smaller;'>3</sup>
  • C 126.00cm<sup style='font-size: smaller;'>3</sup>
  • D 125.00cm<sup style='font-size: smaller;'>3</sup>
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Question 15:
As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75.0cm; the volume of the space above the mercury is 8.0cm3. Calculate the correct barometer height when the barometer reads 74.0cm and the volume of the space above the mercury is 6.0cm3.
  • A 72.0cm
  • B 74.5cm
  • C 75.1cm
  • D 76.0cm
View Answer & Explanation