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Physics 2012 WAEC Past Questions

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41
An inductor is connected to a 24V, 50Hz mains supply. If the current through the inductor is 1.5A, calculate the inductance of the inductor (\(\pi = \frac{22}{7}\))
  • A. 8.0 x 102H
  • B. 7.5 x 10oH
  • C. 1.6 x 10oH
  • D. 5.1 x 10-2H
View Answer & Discuss (1) WAEC 2012
42

In a R-C circuit

  • A. Irms leads Vrms by 60o
  • B. Irms slags Vrms by 60o
  • C. Vrms lags Irms by 90o
  • D. Vrms leads Irms by 90o
View Answer & Discuss (2) WAEC 2012
43
An atom in an excited state is one whose
  • A. potential energy is minimum
  • B. potential energy is maximum
  • C. electron are in the conduction band
  • D. electron have moved to higher energy level
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44
A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is
  • A. 1.0eV
  • B. 3.0eV
  • C. 4.0eV
  • D. 7.0eV
View Answer & Discuss (1) WAEC 2012
45
Which of the following statements about X-rays is correct? X-rays
  • A. are produced when a metal surface is irradiated with ultraviolet light
  • B. are produced when a metal target is used to block fast miving electrons
  • C. have long wavelengths and are therefoer very penetrating
  • D. are not part of the electromagnetic spectrum
View Answer & Discuss (1) WAEC 2012
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