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Physics 1979 JAMB Past Questions

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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 & Discuss (9) JAMB 1979
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 & Discuss (7) JAMB 1979
18
What are the units of thermal conductivity?
  • A. kg.m.sec2
  • B. Joule sec-1m-1k-1
  • C. kg.m
  • D. Newton sec-1m2
  • E. m3
View Answer & Discuss (8) JAMB 1979
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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 & Discuss (1) JAMB 1979
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 & Discuss (4) JAMB 1979
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