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Physics 1985 JAMB Past Questions

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36

A cell gives a current of 0.15A through a resistance of 8\(\Omega\) and 0.3A. When the resistance is changed to 3\(\Omega\) the internal resistance of the cell is

  • A. 0.05\(\Omega\)
  • B. 1.00\(\Omega\)
  • C. 1.50\(\Omega\)
  • D. 2.00\(\Omega\)
  • E. 2.50\(\Omega\)
View Answer & Discuss (11) JAMB 1985
37
Which of the following will convert a milliammeter to a voltmeter?
  • A. low series resistance
  • B. low parallel resistance
  • C. high series resistance
  • D. high parallel resistance
  • E. parallel resistance equal to milliammeter resistance
View Answer & Discuss (2) JAMB 1985
38
A wire P has half the diameter and half the length of a wire Q of similar material. The ratio of the resistance of P to that of Q is
  • A. 8 : 1
  • B. 4 : 1
  • C. 2 : 1
  • D. 1 : 1
  • E. 1 : 4
View Answer & Discuss (8) JAMB 1985
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39
An electric kettle, connected to a 240V mains, produces 6.0 x 105J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.
  • A. 14.4\(\Omega\)
  • B. 28.8\(\Omega\)
  • C. 144\(\Omega\)
  • D. 288\(\Omega\)
  • E. 2880\(\Omega\)
View Answer & Discuss (5) JAMB 1985
40

On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current

  • A. i only
  • B. ii only
  • C. iii only
  • D. ii and iii only
  • E. i,ii and iii
View Answer & Discuss (9) JAMB 1985
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