2015 - WAEC Physics Past Questions and Answers - page 4
31
Red light travels faster than blue light when both of them pass through a glass prism because the
A
refractive index of red light is grester than that of blue light
B
refractive index of blue light is greater than that of red light
C
red light is more intense than the blue light
D
blue light is more intense than the red light
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32
An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed
A
0.5
B
1.5
C
2.0
D
3.0
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33
All electromagnetic waves in a vacuum have the same
A
wavelength
B
frequency
C
speed
D
amplitude
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34
The diagram given illustrates two charged particles W and X. The charges on W and x are respectively
A
negative; negative
B
negative; positive
C
positive; positive
D
positive; negative
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35
An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is
A
4.6v
B
6.0v
C
8.5v
D
12.0v
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36
An electric generatorĀ rated 12 kW, 2 kVĀ distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.
A
120 w
B
360 w
C
720 w
D
2400 w
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37
Which of the following statements is correct? When capacitors of different values are connected in series
A
the same charge flows through them
B
the same voltage appears across each capacitor
C
different quantities of charges flow through them in different voltages across them
D
different quantities of charges flows through them with the same voltage across them
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38
Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue
A
i only
B
ii only
C
i and ii only
D
i, ii and iii
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39
The symbol illustrated above is that of a resistor
A
which absorb light
B
which emits light
C
which absorbs heat to function properly
D
whose resistance is light dependent
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40
A wire of cross-sectional area 0.60mm2 has a restivity of 7.2 x 10-7 \(\Omega\). Calculate the length of wire that will have a resistance of 3\(\Omega\).
A
0.25m
B
2.50m
C
3.60m
D
36.00
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