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221

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

  • A. I and II only
  • B. II and III only
  • C. I, III, and IV only
  • D. II, III and IV only
View Answer & Discuss (13) JAMB 2003
222
Which of the following pairs of light rays show the widest separation in the spectrum of white light
  • A. Blue and red
  • B. Green and yellow
  • C. Indigo and violet
  • D. Orange and red
View Answer & Discuss (10) JAMB 2003
223
The most suitable cell used for short interval switches in electric bells is a
  • A. lead- acid accumulator
  • B. Daniel cell
  • C. Leclanche cell
  • D. nickel iron accumulator
View Answer & Discuss (7) JAMB 2003
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224
A ray incident on a glass prism undergoes minimum deviation when the
  • A. incident angle is equal to the angle of refraction
  • B. refraction angle equals 90o
  • C. incident angle equals 90o
  • D. incident angle is equal to the angle of emergence
View Answer & Discuss (1) JAMB 2003
225
The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later
  • A. 200 count / min
  • B. 100 count / min
  • C. 50 count / min
  • D. 25 count / min
View Answer & Discuss (15) JAMB 2003
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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