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Physics Past Questions and Answers

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Physics Questions

Question 3691:

Two similar cells are used to light two similar lamps as illustrated in the diagrams above. In which of the circuit diagrams are the lamps brightest?

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A P
B Q
C R
D S

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Question 3692:

A 120\(\Omega\) resistor dissipates 8 kJ of heat in 20s. Calculate the current through the resistor

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A 5.8A
B 6.9A
C 30.0A
D 33.3A

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Question 3693:

The magnetic relay is a device used for

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A Timing in sports
B Storing magnetic field
C Readin the magnitude of magnetic flux
D Controlling another circuit carrying larger current

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Question 3694:

the core of a transformer is usually laminated in order to

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A Reduce magnetic leakage
B Reduce eddy current
C Prevent vibration of the transformer
D Make magnetic reversal in the core much easier

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Question 3695:

Which of the following modes is the most economical method of transmitting electrical power over long distances?

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A Alternating current at low voltage and high current
B Alternating current at high voltage and high current
C Alternating current at high voltage and low current
D Direct current at low voltage and high current

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