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Physics 2012 WAEC Past Questions

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36

Two similar cells are used to light two similar lamps as illustrated in the diagrams above. In which of the circuit diagrams are the lamps brightest?

  • A. P
  • B. Q
  • C. R
  • D. S
View Answer & Discuss (3) WAEC 2012
37

A 12\(\Omega\) resistor dissipates 8kJ of heat in 20s. Calculate the current through the resistor

  • A. 5.8A
  • B. 6.9A
  • C. 30.0A
  • D. 33.3A
View Answer & Discuss (4) WAEC 2012
38
The magnetic relay is a device used for
  • A. timing in sports
  • B. storing magnetic field
  • C. readin the magnitude of magnetic flux
  • D. controlling another circuit carrying larger current
View Answer & Discuss (1) WAEC 2012
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39
the core of a transformer is usually laminated in order to
  • A. reduce magnetic leakage
  • B. reduce eddy current
  • C. prevent vibration of the transformer
  • D. make magnetic reversal in the core much easier
View Answer & Discuss WAEC 2012
40
Which of the following modes is the most economical method of transmitting electrical power over long distances?
  • A. alternating current at low voltage and high current
  • B. alternating current at high voltage and high current
  • C. alternating current at high voltage and low current
  • D. direct current at low voltage and high current
View Answer & Discuss (5) WAEC 2012
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