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Sunday, 01 November 2026
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Physics Past Questions and Answers

Jamb 1987 Physics Questions

Question 11:
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 12:
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 13:
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>
View Answer & Explanation
Question 14:
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
Question 15:
Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?
  • A 100<sup style='font-size: smaller;'>o</sup>C
  • B 80<sup style='font-size: smaller;'>o</sup>C
  • C 50<sup style='font-size: smaller;'>o</sup>C
  • D 40<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation