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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 6:
Which of the following statements is NOT true of \(\gamma\)-rays?
  • A \(\gamma\)-rays belong to the electromagnetic spectrum
  • B \(\gamma\)-rays do not carry an electron charge
  • C \(\gamma\)-rays obey the inverse cube law in air
  • D The thickness of aluminium which stops b-particule has a negligible effect on \(\gamma\)-radiation
  • E The difference between \(\gamma\)-rays and X-rays is that \(\gamma\)-rays originate from energy charges in the nuclei of atoms, while X-rays comes from energy charges associated with the electron structure of atoms
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Question 7:
Which of the following statements is CORRECT? i. the mass number is equal to the total number of protons and electrons in an atom. ii. the atomic number is equal to the number of protons in an atom. iii. the number of electrons in an atom is equal to the total number of protons and neutrons in the nucleus.
  • A I only
  • B Ii only
  • C Iii only
  • D I and ii only
  • E Ii and iii only
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Question 8:
Which of the following i. \(\beta\)-particles ii. protons iii. neutrons iv. \(\alpha\)-particles. may be found in light nuclei?
  • A I and ii
  • B I and iii
  • C Ii and iv
  • D Ii and iii
  • E I, ii and iii
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Question 9:
What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?
  • A 92
  • B 146
  • C 238
  • D 330
  • E 119
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Question 10:
Which of the following statements is TRUE of photoelectric effect?
  • A It cannot occur in liquids
  • B The energy of the emitted electrons is independent of the work function of the surface
  • C The energy of the emitted electron depends on the wavelength of the incident light
  • D The greater the intensity of the incuident light, the greater the incident of the emitted electron
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