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1511
An equipment whose power is 1500W and resistance is 375 ohms would draw a current of
  • A. 0.10A
  • B. 2.00A
  • C. 4.00A
  • D. 77.5A
View Answer & Discuss (5) JAMB 1991
1512
To convert an alternating current dynamo into a direct current dynamo, the
  • A. number of turns in the coil is increased
  • B. strength of the field magnet is increased
  • C. slip rings are replaced with a split ring commutator
  • D. coil is wound on a soft iron armature
View Answer & Discuss (3) JAMB 1991
1513
If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes
  • A. inductance
  • B. eddy currents
  • C. elecro-magnetism
  • D. dipole moment
View Answer & Discuss (4) JAMB 1991
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1514
The electrochemical equivalent of platinum is 5.0 x 10-7kgC-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for
  • A. 5.6 hours
  • B. 56 hours
  • C. 1.4 x 104 hours
  • D. 2.0 x 104 hours
View Answer & Discuss (8) JAMB 1991
1515

which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.

  • A. i and ii only
  • B. i and iii only
  • C. ii and iii only
  • D. i, ii, and iii
View Answer & Discuss (26) JAMB 1991
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