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2011 - WAEC Physics Past Questions and Answers - page 4

31

two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

A
0.5s
B
1.0s
C
1.2s
D
2.0s
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32

The main difference between echo and reverberation is that

A
reverberation is reflected sound while echo is refracted sound
B
the time interval between incident sound and reflecte sound is shorter for reverbration
C
the amplitude of an echo is greater
D
reverberation is from acoustic speakers while echo comes from clifts
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33

Which of the following statements about the electromagnetic waves is correct?

A
radio waves have longer frequencies than x-rays
B
x-rays have the longest wavelength
C
some of the waves travel at 3.0 x 108ms-1
D
white light occupies a region beyond ultraviolet rays
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34

The correct relationship between "G" and "g" in a gravitational field is given by the equation (Where the symbols have their usual meanings)

A
g = \(\frac{GM}{R}\)
B
g = \(\frac{GM}{R^2}\)
C
g = \(\frac{GM^2}{R}\)
D
g = \(\frac{GM^2}{R^2}\)
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35

The capacitance of a parallel-plate capacitor

A
decreases when the seperation between the plate decreases
B
increases when the optential difference between the plates is increased
C
is greater without a dielectric material between the plates than with a dielectric
D
is greater with a dielectric between the plates than without a dielectric.
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36

When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold

A
collapse slowly
B
vibrate
C
are not affected
D
diverge rapidly
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37

Which of the following substances does not conduct electricity?

A
graphite
B
glass
C
sulphuric acid
D
table salt solution
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38

The unit of capacitance is

A
farad
B
coulomb
C
henry
D
ohms
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39

An ammeter with a full scale deflection of 10mA has an internal resistance 0.5(\Omega). calculate the resistance of the shunt required to adapt it to read up to 3A

A
0.0167\(\Omega\)
B
0.0130\(\Omega\)
C
0.0250\(\Omega\)
D
0.1000\(\Omega\)
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40

The resistivity, (\mathit{P}), of a material of length l, cross-sectional area A, resistance R, is given by the equation

A
\(\mathit{P} = \frac{RA}{l}\)
B
\(\mathit{P} = \frac{l}{RA}\)
C
\(\mathit{P} = \frac{Rl}{A}\)
D
\(\mathit{P} = \frac{R}{Al}\)
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