2015 - WAEC Physics Past Questions and Answers - page 3
21
In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60oC is known as the
A
vaporization point
B
cooling temperature
C
boiling point
D
melting point
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22
Which of the following concepts is a method of heat transfer that does not require a material medium?
A
conduction
B
radiation
C
diffusion
D
convection
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23
Which of the following units is the S.I. unit of heat capacity?
A
Jkg-1
B
Jkg-1 K-1
C
JK-1
D
Jg-1K-1
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24
The pressure applied to an enclosed fluid to one end id transmitted equally throughout the fluid and to the container walls. This statement is
A
Archimede's principle
B
Bernoulli's principle
C
Pascal's principle Heisenberg's
D
Heisenberg's uncertainty principle
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25
The diagram given illustrates a wave form. Determine the speed of the wave
A
5.4 ms-1
B
8.4 ms-1
C
9.6 ms-1
D
10.0 ms-1
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26
What type of wave is emitted by a loud speaker?
A
Transverse
B
Longitudinal
C
Gamma
D
Radio
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27
An object is placed 15cm from a diverging lens of focal length 12cm. The image of the object formed by the lens in
A
real and 6.67cm from the lens
B
virtual and 6.67cm from the lens
C
real and 60.00cm from the lens
D
virtual and 60.00cm from the lens
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28
A swimming pool is .1m deep. If it contains water of refractive index 1.3, calculate the apparent depth of pool
A
3.4m
B
2.7m
C
1.6m
D
0.8m
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29
When an air column is set into vibrations, the distance between two consecutive nodes of the resultant wave is
A
one quarter of the wavelength
B
half of the wavelength
C
the wavelength
D
twice the wavelength
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30
A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms-1]
A
23m
B
128m
C
288m
D
298m
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