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Physics Past Questions and Answers

Jamb Physics Questions

Question 31:

The maximum power transfer occur in a cell when the external resistance is

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A Twice the internal resistance of the cell
B The same as the internal resistance of the cell
C Greater than the internal resistance of the cell
D Less than the internal resistance of the cell

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Question 32:

If a metal wire 4m long and cross-sectional area 0.8 mm² has a resistance of 60, find the resistivity of the wire

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A 5.3x10^-7
B 3.0x10^-5
C 1.2x10^-6
D 3.2x10^-6

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Question 33:

A circuit has a resistance of 200â„¦. The resistance of the circuit can be reduced to 120â„¦ when

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A A 300â„¦ resistor is connected to it in parallel
B An 80Ω resistor is conneceted to it in series
C A 150â„¦ resistor is connected to it in parallel
D A 240â„¦ resistor is connected to it in series

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Question 34:

PHCN measures its electrical energy in

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A W
B KWh
C Wh
D J

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Question 35:

What is the best method of demagnetizing a steel bar magnet?

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A Hammering
B Heating it
C Rough handling it
D Solenoid method

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