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Physics WAEC Past Questions

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126
What is the value of R when G shows no deflection in the circuit illustrated above?
  • A. 80Ω
  • B. 75Ω
  • C. 45Ω
  • D. 20Ω
  • E. 10Ω
View Answer & Discuss (4) WAEC 1990
127
A charge of 1.0 x 10-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?
  • A. 8.00 x 106NC-1
  • B. 4.00 x 106NC-1
  • C. 4.00 x 10-4NC-1
  • D. 2.00 x 10-4NC-1
  • E. 2.50 x 10-1NC-1
View Answer & Discuss (1) WAEC 1990
128

If the frequency of the ac. circuit illustrated above is 500/π Hz what would be the reactance in the circuit? 

(Inductance (L) = 0.9H, Capacitance (C) = \(2 \times 10^{-6}\)

  • A. 0.0009Ω/π
  • B. 100Ω
  • C. 1030Ω
  • D. 400Ω
  • E. 2500Ω
View Answer & Discuss (7) WAEC 1990
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129
Calculate the resistance of the filament of a lamp rates 240 V, 40 W
  • A. 240Ω
  • B. 360Ω
  • C. 720Ω
  • D. 1440Ω
  • E. 2880Ω
View Answer & Discuss WAEC 1990
130

Birds can perch safely on overhead electric power cables without being electrocuted because

  • A. birds can withstand high p.d. of the electric power cables
  • B. any accumulated charge on the birds is quickly dissipated
  • C. the feet of the birds are well insulated
  • D. the current is a.c. and has particular direction
  • E. there is no p.d between the birds and the cables
View Answer & Discuss (4) WAEC 1990
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