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Physics 1992 JAMB Past Questions

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36
The maximum permissible current through a galvanometer G of internal resistance 10\(\Omega\) is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G
  • A. 20,000 ohms in parallel
  • B. 19,990 ohms in series
  • C. 1990 ohms in series
  • D. 100 ohms in series
View Answer & Discuss (13) JAMB 1992
37
In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to
  • A. volt, ampere and hertz
  • B. ohms, volt and hertz
  • C. watt, ohms and radian
  • D. ohms, hertz and joule
View Answer & Discuss (1) JAMB 1992
38
In A.C circuit theory, the root means square (r.m.s) current, Irms and the peak (maximum)current Io are related by
  • A. Io = \(\frac{I_rms}{\sqrt{2}}\)
  • B. Irms = \(\frac{I_o}{\sqrt{2}}\)
  • C. Irms = \(\frac{\frac{I}{I_o}}{\sqrt2}\)
  • D. Irms = \(\frac{I_rms}{\sqrt{2}}\)
View Answer & Discuss (1) JAMB 1992
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39
The threshold of frequency for photoelectric effect depends on the
  • A. intensity of incident light
  • B. frquency of incident light
  • C. material of the photocathode
  • D. potential difference between the cathode and the anode
View Answer & Discuss (6) JAMB 1992
40
After three half lifes, the fraction of a radioactive material that has decayed is
  • A. \(\frac{1}{8}\)
  • B. \(\frac{1}{3}\)
  • C. \(\frac{2}{3}\)
  • D. \(\frac{7}{8}\)
View Answer & Discuss (9) JAMB 1992
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