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Physics 1992 WAEC Past Questions

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51
lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?
  • A. 0.01Ω
  • B. 190.91 Ω
  • C. 200.00 Ω
  • D. 795.46 Ω
  • E. 1000.00Ω
View Answer & Discuss (1) WAEC 1992
52
Which of the following statements is correct about cathode rays? They are fast moving
  • A. atoms
  • B. ions
  • C. neutrons
  • D. protons
  • E. electrons
View Answer & Discuss (1) WAEC 1992
53
Which of the following gives rise to the line spectra obtained from atoms?
  • A. Kinetic energy of a moving atom
  • B. Potential energy of an electron inside an atom
  • C. Change of an electron from a higher to a lower energy level in the atom
  • D. Disturbed proton in the nucleus
  • E. Excitation of an electron in the atom
View Answer & Discuss WAEC 1992
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54
A stream of alpha particles is projected into an electric field between two plates X and Y as shown in the diagram above. Which of the following is correct? The particles are
  • A. accelerated and they continue in a straight line
  • B. directionally reversed at the end of the plates
  • C. deflected towards plate Y
  • D. attracted by both plates
  • E. deflected towards plate X.
View Answer & Discuss (2) WAEC 1992
55
An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
  • A. 1 N atoms8              
  • B. 1 N atoms3              
  • C. 2 N atoms3              
  • D. 5 N atoms6              
  • E. 7 N atoms8              
View Answer & Discuss (8) WAEC 1992
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