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1701

A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms^-1, what is the frequency of the clapping?

A. 1 Hz
B. 2Hz
C. 4Hz
D. 8Hz

View Answer & Discuss (4) JAMB 1986

1702

The vibration of an air column produces the sound in the

A. piano
B. guiter
C. flute
D. school handbell

View Answer & Discuss (1) JAMB 1986

1703

Which of the following is NOT a part of a d.c. electric motor?

A. Field-magnet
B. Armature
C. Commutator
D. Transformer

View Answer & Discuss (4) JAMB 1986

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1704

Which of the following is stored by a dry Leclanche cell?

A. Electrical power
B. Kinetic energy
C. Electric current
D. Chemical energy

View Answer & Discuss (4) JAMB 1986

1705

Which of the following is true of magnetism?

A. Iron fillings cling mainly round the ends of a bar magnet
B. The freely suspended bar magnet comes to rest in the geographic north-south direction
C. Like poles attract
D. Iodestone is a non-magnetic oxide

View Answer & Discuss (23) JAMB 1986

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