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Physics 1978 JAMB Past Questions

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26
In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is
  • A. 10 ohms
  • B. 1 ohms
  • C. zero
  • D. 20 ohms
  • E. infinite
View Answer & Discuss (10) JAMB 1978
27

On an a.c generator, which of the following does not apply?

  • A. field magnet
  • B. commutator
  • C. armature
  • D. slip rings
  • E. carbon brushes
View Answer & Discuss (8) JAMB 1978
28

Why is it impossible for the lines of force of an electric field to cross one another?

  • A. like charges repel each other
  • B. a charged particle is deflected by an eletric field
  • C. like charges are arranged on the same line of force
  • D. a positively charged particle can travel in only one direction at any time
  • E. none of these is correct
View Answer & Discuss (10) JAMB 1978
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29
A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is
  • A. 4800 cal
  • B. 6000 cal
  • C. 2400J
  • D. 240k cal
  • E. 6000J
View Answer & Discuss (1) JAMB 1978
30
The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by
  • A. commutators
  • B. transistors
  • C. valves and diodes
  • D. rectifiers
  • E. transformers
View Answer & Discuss (3) JAMB 1978
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