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Physics 2000 JAMB Past Questions

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26

In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]

  • A. 9.0 x 10-13J
  • B. 9.0 x 10-12J
  • C. 9.0 x 10-11J
  • D. 9.0 x 10-10J
View Answer & Discuss (11) JAMB 2000
27
A gas would serve as an electrical conductor under
  • A. reduced pressure and high current
  • B. increased magnetic field
  • C. reduced pressure and reduced potential
  • D. exposure to visible light
View Answer & Discuss (4) JAMB 2000
28
An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is
  • A. 80.0W
  • B. 40.0W
  • C. 10.0W
  • D. 0.1W
View Answer & Discuss (7) JAMB 2000
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29

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]

  • A. 6630.0V
  • B. 663.0V
  • C. 66.3V
  • D. 6.6V
View Answer & Discuss (8) JAMB 2000
30
If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?
  • A. 24 years
  • B. 20 years
  • C. 10 years
  • D. 2 years
View Answer & Discuss (6) JAMB 2000
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts