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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1979 Physics Questions

Question 16:
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 17:
Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of
  • A The cross-sectional area of the tube
  • B The atmospheric pressure
  • C The density of mercury
  • D The temperature of mercury
  • E The acceleration due to gravity
View Answer & Explanation
Question 18:
What are the units of thermal conductivity?
  • A Kg.m.sec<sup style='font-size: smaller;'>2</sup>
  • B Joule sec<sup style='font-size: smaller;'>-1</sup>m<sup style='font-size: smaller;'>-1</sup>k<sup style='font-size: smaller;'>-1</sup>
  • C Kg.m
  • D Newton sec<sup style='font-size: smaller;'>-1</sup>m<sup style='font-size: smaller;'>2</sup>
  • E M<sup style='font-size: smaller;'>3</sup>
View Answer & Explanation
Question 19:
Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by
  • A Heating the bar to a high temperature
  • B Breaking the bar
  • C Connecting opposite poles with a small piece of iron
  • D Placing the bar inside a strong magnetic field
  • E None of the above
View Answer & Explanation
Question 20:
An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?
  • A 5 volts
  • B 3.5 volts
  • C 2.5 volts
  • D 1 volts
  • E 10 volts
View Answer & Explanation