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Physics 2002 WAEC Past Questions

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41
A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?
  • A. 85.0%
  • B. 83.3%
  • C. 37.5%
  • D. 30.0%
View Answer & Discuss (5) WAEC 2002
42
A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately
  • A. north-south
  • B. south-west
  • C. north-east
  • D. south-east
View Answer & Discuss WAEC 2002
43

Calculate the inductance L, of the coil in the circuit diagram shown above

  • A. 3.8H
  • B. 0.6H
  • C. 0.4H
  • D. 0.2H
View Answer & Discuss (6) WAEC 2002
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44

In a model of the hydrogen atom, the energy levels Wn are given by the formula Wn = -\(\frac{R}{n^2}\), where n is an integer and R is a constant. Determine the energy released in the transition from n = 3 to n = 2.

  • A. \(\frac{R}{5}\)
  • B. -\(\frac{R}{4}\)
  • C. \(\frac{5R}{36}\)
  • D. \(\frac{-5R}{36}\)
View Answer & Discuss (13) WAEC 2002
45
If a radioactive atom emits a beta particle, Its mass number
  • A. increases by one
  • B. remains the same
  • C. decreases by one
  • D. increases by two
View Answer & Discuss (5) WAEC 2002
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