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Physics 1999 JAMB Past Questions

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26

A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

  • A. 2A
  • B. 5A
  • C. 10A
  • D. 20A
View Answer & Discuss (66) JAMB 1999
27
A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?
  • A. 2mA
  • B. 10mA
  • C. 20mA
  • D. 25mA
View Answer & Discuss (19) JAMB 1999
28
In fleming's right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the
  • A. motion, the field and the induced current
  • B. induced current, the motion and the field
  • C. field, the induced current and the motion
  • D. induced current, the field and the motion
View Answer & Discuss (10) JAMB 1999
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29
At what frequency would a 10H inductor have a reactance of 2000Ω?
  • A. π/200Hz
  • B. π/100Hz
  • C. 100/πHz
  • D. 100πHz
View Answer & Discuss (7) JAMB 1999
30
The core of an efficient transformer should consist of laminated pieces of metal in order to
  • A. increase the heat produced by increasing the eddy current
  • B. increase the heat produced by reducing the eddy current
  • C. reduce the heat produced by increasing the eddy current
  • D. reduce the heat produced by reducing the eddy current
View Answer & Discuss (15) JAMB 1999
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