Physics Past Questions

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781

In a domestic circuit, electrical appliances and lamps are arranged in parallel across the mains so as to enable the

A. same current to flow through the electrical appliances and the lamps
B. maximum energy to be consumed at least cost
C. same fuse to be used for the electrical appliances and the lamps
D. voltage across the appliances not to be affected when the lamps are switched on and off
E. heat losses to be minimized

View Answer & Discuss (1) WAEC 1992

782

Calculate the time in which 4.8 kJ of energy would be expended when an electric heater of resistance 1.8 x 10³Ω is used on a 240 V mains supply. (Neglect heat losses to the surrounding).

A. 150.0s
B. 90.0s
C. 36.0s
D. 20.0s
E. 2.7s.

View Answer & Discuss WAEC 1992

783

Lenz’s law of electromagnetic induction states that

A. electromotive force is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
B. the induced current in a conductor is in such a direction as to oppose the change producing it
C. the induced e.m.f. in a circuit is proportional to the rate of change of number of lines of force linking the circuit
D. a force is exerted on a current carrying conductor in a magnetic field
E. the induced e.m.f. is proportional to the current producing the magnetic flux.

View Answer & Discuss WAEC 1992

784

Which of the following statements is not correct?

A. A magnetic Held is a region where a magnetic force can be detected.
B. Magnetic fields are scalar quantities.
C. The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.
D. the angle between the direction of the earth’s magnetic held and the horizontal is called the angle of dip.
E. Iron filings can be used to trace out the magnetic field around a bar magnet.