Physics Past Questions

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2771

The magnetic relay is a device used for

A. timing in sports
B. storing magnetic field
C. readin the magnitude of magnetic flux
D. controlling another circuit carrying larger current

View Answer & Discuss (1) WAEC 2012

2772

the core of a transformer is usually laminated in order to

A. reduce magnetic leakage
B. reduce eddy current
C. prevent vibration of the transformer
D. make magnetic reversal in the core much easier

View Answer & Discuss WAEC 2012

2773

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

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

View Answer & Discuss (5) WAEC 2012

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2774

An inductor is connected to a 24V, 50Hz mains supply. If the current through the inductor is 1.5A, calculate the inductance of the inductor (\(\pi = \frac{22}{7}\))

A. 8.0 x 10²H
B. 7.5 x 10^oH
C. 1.6 x 10^oH
D. 5.1 x 10^-2H

View Answer & Discuss (1) WAEC 2012

2775

In a R-C circuit

A. I^rms leads V^rms by 60^o
B. I^rms slags V^rms by 60^o
C. V^rms lags I^rms by 90^o
D. V^rms leads I^rms by 90^o

View Answer & Discuss (2) WAEC 2012

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