Physics Past Questions

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1546

An organic pipe closed at one end is 80cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340ms-1

A. 106Hz
B. 213Hz
C. 318Hz
D. 425Hz

View Answer & Discuss (5) JAMB 1990

1547

A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is

A. 5.1N
B. 7.1N
C. 14.0N
D. 19.6N

View Answer & Discuss (6) JAMB 1990

1548

One of the properties of the earth's magnetic field is that the

A. north pole lies in the northern hemisphere
B. geographic and magnetic meridians coincide
C. earth's magnetic flux is entirely horizontal at a place where the magnetic dip is zero
D. earth's magnetic flux is entirely vertical at a place where the magnetic dip is zero

View Answer & Discuss (2) JAMB 1990

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1549

Which of the following statements are true of an insulated charged body carrying positive charge? i. it contains excess positive charges. ii. it creates an electric field. iii. it possesses potential energy. iv. it carries electric current.