2014 - JAMB Physics Past Questions and Answers - page 3
21
Heat transfer by convection in a liquid is due to the
A
Latent heat of vaporization of the liquid
B
Increased vibration of the molecules of the liquid about theit mean position
C
Variation of density of the liquid
D
Expansion of the liquid as it is heated
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22
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
A
2.0x102Hz
B
4.5x103Hz
C
2.0x103Hz
D
4.5x102Hz
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23
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?
A
528m
B
66m
C
136m
D
264m
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24
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
A
2.5x102
B
2.5x10-2
C
2.5x10-1
D
2.5x101
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25
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
A
2.7m
B
2.0m
C
2.3m
D
2.5m
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26
In a compound microscope, the objective and the eye piece focal lengths are
A
At infinity
B
Long
C
Short
D
The same
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27
When a telescope is in normal use, the final image is at
A
Infinity
B
The focus
C
The radius of curvature
D
The near point
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28
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf
A
Remains the same
B
Collapses
C
Collapses and diverges again
D
Diverges
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29
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
A
1C
B
5C
C
4C
D
2C
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30
The maximum power transfer occur in a cell when the external resistance is
A
Twice the internal resistance of the cell
B
The same as the internal resistance of the cell
C
Greater than the internal resistance of the cell
D
Less than the internal resistance of the cell
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