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1791
Cathode rays are
  • A. high-energy electromagnetic waves
  • B. protons
  • C. streams of electrons
  • D. neutrons
  • E. radio waves
View Answer & Discuss (2) JAMB 1984
1792

A device that converts sound energy into electrical energy is?

  • A. the horn of a motor car
  • B. an A.C. generator
  • C. a microphone
  • D. the telephone
  • E. radio waves
View Answer & Discuss (31) JAMB 1984
1793
Which of the following i. \(\beta\)-particles ii. protons iii. neutrons iv. \(\alpha\)-particles. may be found in light nuclei?
  • A. i and ii
  • B. i and iii
  • C. ii and iv
  • D. ii and iii
  • E. i, ii and iii
View Answer & Discuss (3) JAMB 1984
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1794
Radio waves have a velocity of 3 x 108ms-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is
  • A. 375.0m
  • B. 267.0m
  • C. 240.0m
  • D. 37.5m
  • E. 26.7m
View Answer & Discuss (6) JAMB 1984
1795
What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
  • A. N0.65
  • B. N0.13
  • C. N3.90
  • D. N39.00
  • E. N234.00
View Answer & Discuss (2) JAMB 1984
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