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2013 - WAEC Physics Past Questions and Answers - page 3

21

the equation of a certain progressive transverse wave is y = 2 sin 2 (\pi ( \frac{1}{0.01} - \frac{x}{30})), where x and y are in cm and t in seconds. Calculate the period of the wave

A
0.001s
B
0.010s
C
10.000s
D
100.000s
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22

At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?

A
at the centre of curvature
B
at the principal focus
C
between the pole and principal focus
D
between the centre of curvature and principal focus
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23

Images formed by a convex mirror are always

A
magnified
B
behind the mirror
C
real
D
inverted
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24

The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface

A
19o
B
21o
C
39o
D
42o
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25

A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance

A
10cm
B
12cm
C
50cm
D
60cm
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26

Which of the following statements about the Galilean telescope is not correct?

A
the final image is inverted
B
it is shorter than terrestial telescope
C
the final image is erect
D
it has a small field of view
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27

Which of the following radiations has it's frequency lower than that of infrared radiation?

A
Utra-violet rays
B
gamma rays
C
x-rays
D
radio waves
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28

a string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled

A
14Hz
B
18Hz
C
28Hz
D
56Hz
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29

Which of the following statements about waves in pipes is correct?

A
for open pipes, there is only one end correction to be accounted for
B
for closed pipes, there are two end corrections to be accounted for
C
only odd harmonics are possible in closed pipes
D
all harmonics are possible in closed pipes
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30

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

A
negative charges flows to the ground through the person's body
B
positive charges flow from the ground through his body to neutralize the negative charges
C
positive charges in the air neutralizes the negative charges the person is holding
D
negative charges will leak through the air
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