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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Sources of Light

Jamb Physics Questions - Sources of Light

Question 1:
A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P.A. charges 5k per unit, his bill for 30 days is
  • A N5.70
  • B N7.23
  • C N3.65
  • D N8.05
  • E N4.50
View Answer & Explanation
Question 2:
Natural radioactivity consists of the emission of
  • A \( \alpha \) -particle and \( \beta \) rays
  • B \( \alpha \) -particle and X-rays
  • C \( \gamma \)-rays and X-rays
  • D \( \alpha \)-particle, \( \beta \) rays and \( \gamma \)-rays
  • E \( \alpha \) -particle, \( \beta \) rays, \( \gamma \)-rays and X-rays
View Answer & Explanation
Question 3:
Which of the following statements is (are) NOT true about the emission of the photoelectrons from metallic surfaces?
i. all metallic surfaces emits the same number of photoelectrons in a given light
ii. most metallic surfaces emit the same number of photoelectrons in visible and infra-red light
iii. a metallic surface emits photoelectrons only if the frequency of the incident light is higher than its own characteristics threshold frequency
  • A I only
  • B Ii only
  • C I and ii
  • D Ii and iii
  • E Iii only
View Answer & Explanation
Question 4:
I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these above is a natural source of light?
  • A II, III, and IV only
  • B I, II and III only
  • C III and IV only
  • D II and IV only
View Answer & Explanation
Question 5:
Natural radioactivity consists of the emission of
  • A α- particles and β-rays
  • B α- particles and X-rays
  • C α- particles, β - rays and g-rays
  • D γ- rays and X-rays
View Answer & Explanation