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291
A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. the most likely group of the element is
  • A. V
  • B. III
  • C. I
  • D. II
View Answer & Discuss (3) JAMB 2005
292

The charge carriers in gasses are

  • A. ions only
  • B. electrons and ions
  • C. electrons and holes
  • D. electrons only
View Answer & Discuss (10) JAMB 2005
293

The ray which causes gas molecules to glow is known as

  • A. cathode ray
  • B. anode ray
  • C. molecular ray
  • D. gamma ray
View Answer & Discuss (1) JAMB 2005
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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294
A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil.
  • A. 200
  • B. 100
  • C. 250
  • D. 150
View Answer & Discuss (1) JAMB 2005
295
The current in a reverse-biased junction is due to?
  • A. minority carriers
  • B. electrons
  • C. majority carriers
  • D. holes
View Answer & Discuss (6) JAMB 2005
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts