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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Elementary Modern Physics

Jamb Physics Questions - Elementary Modern Physics

Question 11:
Isotopes are nuclei which have
  • A The same number of nuetrons and electrons
  • B Equal number of electrons and protons
  • C The same atomic number but different number of neutrons
  • D The same number of total particles
View Answer & Explanation
Question 12:
Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of
  • A 70
  • B 78
  • C 82
  • D 90
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Question 13:
The number of neutrons contained in the nucleus \(^{238}_{92}U\) is
  • A 92
  • B 146
  • C 238
  • D 330
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Question 14:
In a nuclear fusion process, four protons each of mass Mp were fused to produce a nucleus X of mass Mx. Which of the following equations is CORRECT?
  • A 4M<sub style='font-size: smaller;'>p</sub> > M<sub style='font-size: smaller;'>x</sub>
  • B 4M<sub style='font-size: smaller;'>p</sub> = M<sub style='font-size: smaller;'>x</sub>
  • C 4M<sub style='font-size: smaller;'>p</sub> < M<sub style='font-size: smaller;'>x</sub>
  • D M<sub style='font-size: smaller;'>p</sub> > M<sub style='font-size: smaller;'>x</sub>
View Answer & Explanation
Question 15:
Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.
  • A I and ii only
  • B Ii and iii only
  • C I and iii only
  • D I, ii, and iii only
View Answer & Explanation