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Physics 2005 WAEC Past Questions

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41
Lenz's law of electromagnetic induction states that
  • A. a force is exerted on a current-carrying conductor in a magnetic field
  • B. electromotive force id induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
  • C. the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of flux linking the circuit
  • D. the induced current in a coil is in such a direction that it sets up a magnetic field which opposes the change producing it
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42
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when
  • A. the magnet is moved away from the stationary solenoid
  • B. the solenoid is moved away from the stationary magnet
  • C. the magnet is moved towards the stationary solenoid
  • D. there is no relative motion between the magnet and the solenoid
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43
an electric motor is a machine that converts
  • A. mechanical energy into electrical energy
  • B. electrical energy into mechanical energy
  • C. high voltage to low voltage
  • D. low voltage to high voltage
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44
Which of the following statements is an advantage of nuclear fusion over nuclear fission?
  • A. The resulting chain reaction which produces large amount of energy
  • B. no radioactve wave is produced as bye product
  • C. very high temperature is required in the process
  • D. the end product is lead
View Answer & Discuss (5) WAEC 2005
45
Which of the following statements is not a reason for using soft iron in making the core of a transformer? It
  • A. retains its magnetism for a long time
  • B. is easily magnitised
  • C. reduces energy loss due to hysteresis
  • D. is easily demagnetised
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