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Physics 1989 JAMB Past Questions

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21
Dispersion of light by a glass prism is due to the
  • A. different colours of the glass
  • B. different speeds of the various colours in glass
  • C. defects in the glass
  • D. high density of glass
View Answer & Discuss (5) JAMB 1989
22
Which of the following pairs is NOT part of the electromagnetic spectrum? i. Radio waves. ii. Beta rays. iii. Gamma rays. iv. Alpha rays
  • A. i and ii
  • B. iii and iv
  • C. i and ii
  • D. ii and iv
View Answer & Discuss (8) JAMB 1989
23
Two insulated charged spheres of different sizes and carrying opposite charges are connected together by a metallic conductor. Current will flow from one sphere to the other until both sphere
  • A. carry the same magnitude and sign of charge
  • B. are at the same potential
  • C. are at the same temperature
  • D. are of the same size
View Answer & Discuss (4) JAMB 1989
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24
When a number of identical small magnets are arranged in a line, the strength of the resultant magnet
  • A. ia largest when they are arranged end to end
  • B. is greatest when they are arrangedparallel with like poles adjacent to each other
  • C. depends only on the number of magnets provided they arev parallel
  • D. is greater when the magnets are arranged on a wooden surface than on a metaln surface
View Answer & Discuss (8) JAMB 1989
25

A bar magnet is most effectively demagnetized by

  • A. placing it in a N - S position and hitting it with a hammer
  • B. subjecting it to an electric current from a battery
  • C. bringing its north pole in contact with the north pole of a very strong magnet
  • D. heating the magnet
View Answer & Discuss (15) JAMB 1989
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