Physics 1993 JAMB Past Questions

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Which of the following devices may be used to step up the voltage in a d.c. circuit?

A. a step-up transformer
B. a d.c. generator
C. a wattmeter
D. an induction coil

View Answer & Discuss (6) JAMB 1993

The primary aim in high tension transmission is to

A. minimize electrical energy losses due to heat production
B. increase the rate of energy transfer by using high voltage
C. increase the current in the wire
D. generate electricity at high current and low voltage

View Answer & Discuss (4) JAMB 1993

Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 10³Hz oscillator.

A. 39.0\(\Omega\)
B. 122.5\(\Omega\)
C. 245.0\(\Omega\)
D. 39000.0\(\Omega\)

View Answer & Discuss (4) JAMB 1993

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Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny particles carrying negative electric charges. ii. they are deflected in a magnetic field but not in an electric field. iii. they consist of fast moving neutrons and deflected in an electric field.