Physics WAEC Past Questions

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246

The function of the magnanese (IV) oxide in a leclanche cell is to

A. decrease the e.m.f. of the cell
B. prevent local action in the cell
C. prevent polarization in the cell
D. increase the density of the electrolyte
E. increase the resistance of the cell.

View Answer & Discuss WAEC 1993

247

In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

A. 7.5A
B. 2.5A
C. 1.2A
D. 0.8A
E. O.4A

View Answer & Discuss (2) WAEC 1993

248

Electrical resistance is the property of an electrical conductor that causes electrical energy to be converted into

A. mechanical energy
B. solar energy
C. heat energy
D. magnetic energy
E. chemical energy.

View Answer & Discuss WAEC 1993

249

Calculate the current, I in the diagram shown above.
(Neglect the internal resistance of the cell)

A. 4.0A
B. 2.0A
C. 1.0A
D. O.5A
E. 0.1A.

View Answer & Discuss (6) WAEC 1993

250

Which of the following is not a conductor of electricity?

A. Human body
B. Glass
C. Silver
D. Earth
E. Copper

View Answer & Discuss WAEC 1993

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