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Tuesday, 19 May 2026
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Physics Past Questions and Answers

Jamb 1987 Physics Questions

Question 21:
Calculate the amount of heat required to convert 2kg of ice at 2oC to water at 0oC. [specific heat capacity of ice = 2090Jkg-1oC-1, specific latent heat of fusion of ice = 333kJkg-1]
  • A 666J
  • B 8360J
  • C 666 000J
  • D 674 360J
View Answer & Explanation
Question 22:
A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is
  • A 60.0ms<sup style='font-size: smaller;'>-1</sup>
  • B 6.0ms<sup style='font-size: smaller;'>-1</sup>
  • C 1.5ms<sup style='font-size: smaller;'>-1</sup>
  • D 0.6ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 23:
A boat at anchor is rocked by waves whose crest are 100m apart and whose velocity is 25ms-1. At what interval does the wave crest reach the boat?
  • A 2500.00s
  • B 75.00s
  • C 4.00s
  • D 0.25s
View Answer & Explanation
Question 24:
Which of the following instruments has a pure tone?
  • A Guitar
  • B Vibrating strings
  • C Tuning fork
  • D Siren
View Answer & Explanation
Question 25:
The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?
  • A 1
  • B 2
  • C 3
  • D 4
View Answer & Explanation