Question 416:

• JAMB 1986

The vibration of an air column produces the sound in the

A. Piano
B. Guiter
C. Flute
D. School handbell

Question 417:

• JAMB 1986

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

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

Question 418:

• JAMB 1986

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

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

Question 419:

• JAMB 1986

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

Question 420:

• JAMB 1986

The angle between the magnetic meridian and the geographic meridian at a locality on the earth is the

A. Longitude of the locality
B. Angle of inclination at the locality
C. Latitude of the locality
D. Angle of declination of the locality