Physics 1991 JAMB Past Questions

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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

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

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 10^{4 hours}
D. 2.0 x 10^{4 hours}

View Answer & Discuss (8) JAMB 1991

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.