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2002 - WAEC Physics Past Questions and Answers - page 4

31

When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called

A
beats
B
diffraction
C
overtones
D
resonance
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32

Which of the following instruments is not a wind instrument?

A
clarinet
B
saxophone
C
trumpet
D
xylophone
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33

Which of the following actions will not cause an increase in the frequency of a vibrating string?

A
increasing the tension of the string
B
decrease the mass per unit lengthof the string
C
decrease the length of the string
D
increasing the cross sectional area of the string
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34

Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?

A
ebonite rod
B
gold leaf electroscope
C
proof plane
D
the electrophorus
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35

Three capacitors each of capacitance 18(\mu F) are connected in series. Calculate the effective capacitance of the capacitors

A
54.00\(\mu F\)
B
18.00\(\mu F\)
C
6.00\(\mu F\)
D
0.17\(\mu F\)
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36

Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]

A
6.70 x 10-11N
B
6.70 x 10-10N
C
6.03 x 10-11N
D
6.03 x 10-7N
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37

The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle

A
10.0N kg-1
B
12.6N kg-1
C
25.0N kg-1
D
160.0N kg-1
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38

Local actions is normally prevented in a simple electric cell by

A
introducing an oxidizing agent in the acid
B
not drawing current continously for long period
C
amalgamating the surface of the zinc plate
D
using a porous pot to isolate the zinc plate from the acid
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39

The lead-acid accumulator consists of a

A
lead as the positive electrode
B
lead ocide as the negative electrode
C
hydrochloric acid as the electrolyte
D
tetraoxosulphate(VI) acid as the electrolyte
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40

Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the

A
strength of the magnet
B
number of turns in the coil
C
speed of location in the coil
D
gap between the poles of the magnet
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