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Saturday, 11 April 2026
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Physics Past Questions and Answers

Physics Questions

Question 3696:
WAEC 2012
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 (\(\pi = \frac{22}{7}\))
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  • A 8.0 x 10<sup style='font-size: smaller;'>2</sup>H
  • B 7.5 x 10<sup style='font-size: smaller;'>o</sup>H
  • C 1.6 x 10<sup style='font-size: smaller;'>o</sup>H
  • D 5.1 x 10<sup style='font-size: smaller;'>-2</sup>H
View Answer & Explanation
Question 3697:
WAEC 2012
In a R-C circuit
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  • A I<sup style='font-size: smaller;'>rms</sup> leads V<sup style='font-size: smaller;'>rms</sup> by 60<sup style='font-size: smaller;'>o</sup>
  • B I<sup style='font-size: smaller;'>rms</sup> slags V<sup style='font-size: smaller;'>rms</sup> by 60<sup style='font-size: smaller;'>o</sup>
  • C V<sup style='font-size: smaller;'>rms</sup> lags I<sup style='font-size: smaller;'>rms</sup> by 90<sup style='font-size: smaller;'>o</sup>
  • D V<sup style='font-size: smaller;'>rms</sup> leads I<sup style='font-size: smaller;'>rms</sup> by 90<sup style='font-size: smaller;'>o</sup>
View Answer & Explanation
Question 3698:
WAEC 2012
An atom in an excited state is one whose
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  • 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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Question 3699:
WAEC 2012
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
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  • A 1.0eV
  • B 3.0eV
  • C 4.0eV
  • D 7.0eV
View Answer & Explanation
Question 3700:
WAEC 2012
Which of the following statements about X-rays is correct? X-rays
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  • 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
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