Electromagnetic Induction - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1978

On an a.c generator, which of the following does not apply?

A. Field magnet
B. Commutator
C. Armature
D. Slip rings
E. Carbon brushes

Question 3:

• JAMB 1980

The best material for the core of the primary and secondary coils of an induction coil is

A. Copper, because it has a good conductor of electricity
B. Steel, because it becomes magnetic and retains its magnetism for a long time
C. Rubber, because it is a good insulator and the user is prevented from shock
D. Soft iron, because it becomes magnetic but easily loses its magnetism
E. Glass, because it is transparent

Question 4:

• JAMB 1981

Which of the following is NOT directly associated with direct current (DC)?

A. A dry cell
B. A moving coil galvanometer
C. A transformer
D. A lead- acid accumulator
E. A commutator

Question 5:

• JAMB 1981

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is

A. 5 volts
B. 10 volts
C. 15 volts
D. 20 volts
E. 25 volts