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2000 - JAMB Physics Past Questions and Answers - page 3

21
A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?
A
0.3m
B
3.0m
C
3.5m
D
4.0m
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22
An electron of charge 1.6 x 10-19C and mass 9.1 x 10-31kg is accelerated between two metal plates with a velocity of 4 x 107ms-1, the potential difference between the plates is
A
4.55 x 103V
B
4.55 x 102V
C
9.10 x 101V
D
4.55 x 101V
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23
A cell of internal resistance 0.01Ω can be measured accurately using the
A
Ohm meter
B
metre bridge
C
potentiometer
D
electroscope
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24
What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
A
Compound microscope
B
Galileo's telescope
C
Terrestrial telescope
D
Astronomical telescope
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25
in a pure semiconductor, the number of electrons in the conduction band is
A
less than the number of holes in the valence band
B
equal to the number of holes in the valence band
C
greater than the number of holes in the valence band
D
twice the number of holes in the valence band
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26
In a thermonuclear reaction, the total initial mass is 5.02 x 10-27kg and the total final mass is 0.01 x 10-27kg. The energy released in the process is
[c = 3.0 x 108ms-1]
A
9.0 x 10-13J
B
9.0 x 10-12J
C
9.0 x 10-11J
D
9.0 x 10-10J
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27
A gas would serve as an electrical conductor under
A
reduced pressure and high current
B
increased magnetic field
C
reduced pressure and reduced potential
D
exposure to visible light
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28
An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is
A
80.0W
B
40.0W
C
10.0W
D
0.1W
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29
If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is?
[e = 1.6 x 10-19C, h = 6.63 x 10-34Js]
A
6630.0V
B
663.0V
C
66.3V
D
6.6V
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30
If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?
A
24 years
B
20 years
C
10 years
D
2 years
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