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2009 - WAEC Physics Past Questions and Answers - page 4

31

Sound interference is necessary to produce the phenomenon of

A
beats
B
doppler effect
C
acoustic resonance
D
echo
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32

A satellite in circular motion around the earth does not have

A
a gravitational force acting on it
B
a uniform velocity
C
an acceleration
D
a centripetal force acting on it
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33

When a conductor mounted on an insulating stand is charged and left for sometime, the conductor eventually loses all its charges. This is because the

A
electric charges evaporate from the surface of the conductor
B
charges are connected to earth
C
charges on the conductor are neutralized by opposite charges from the surrounding air
D
charges ionize the surrounding air
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34

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The electric potential at p is given by the expression

A
\(\frac{Q}{4 \pi E_o E_r}\)
B
\(\frac{Q}{4 \pi E_o E_r (R +r)}\)
C
\(\frac{Q}{4 \pi E_o E_r(R - r)}\)
D
\(\frac{Q}{4 \pi E_o E_rR}\)
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35

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The magnitude of the electric field intensity at P is given by the expression

A
\(\frac{Q}{4 \pi E_o E_r r^2}\)
B
\(\frac{Q}{4 \pi E_o E_r(R + r)^2}\)
C
\(\frac{Q}{4 \pi E_o E_r(R - r)^2}\)
D
\(\frac{Q}{4 \pi E_o E_rR^2}\)
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36

A resistor of resistance R is connected to a battery of negligible internal resistance. If a siilar resistor is connected in series with it the

A
effective resistance of the circuit is halved
B
total power dissipated is doubled
C
total current in the circuit is halved
D
terminal voltage is halved
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37

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0(\Omega). A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell

A
2.0\(\Omega\).
B
3.0\(\Omega\).
C
5.0\(\Omega\).
D
6.0\(\Omega\).
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38

A wire of resistivity 4.40 x 10-5(\Omega) cm has a cross sectional area of 7.50 x 10-4 cm2. Calculate the length of the wire that will be required to make a 4.0(\Omega) resistor

A
82.50 cm
B
68.18cm
C
15.90cm
D
11.95cm
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39

A battery of e.m.f. 12.0V and internal resistance0.5(\Omega) is connected to 1.5(\Omega) and 4.0(\Omega) series resistor. Calculate the terminal voltage of the battery.

A
13.0V
B
11.0V
C
3.0V
D
1.0V
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40

If the direction of the curent in a straight wire is reversed, the magnetic field

A
remains the same
B
becomes parallel to the wire
C
ceases to exist
D
is oppositely directed
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