Physics WAEC Past Questions

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1256

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

1257

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

1258

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

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1259

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

1260

An atom in an excited state is one whose

A. potential energy is minimum
B. potential energy is maximum
C. electron are in the conduction band
D. electron have moved to higher energy level

View Answer & Discuss WAEC 2012

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