1994 - JAMB Physics Past Questions and Answers - page 4
31
Which of the following has the lowest internal resistance when new?
A
leclanche cell
B
Daniel cell
C
Accumulator
D
Torch battery
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32
When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because
A
both the pen and the cloth are magnetized
B
the pen is magnetized but the cloth is not
C
the pen is charged while the cloth is magnetized
D
both the pen and the cloth are charged
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33
A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is
A
1.0 x 104J
B
8.0 x 10J
C
1.25 x 10J
D
4.0 x 10-2J
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34
Two capacitors R1 = 4\(\Omega\) and R2 = 5\(\Omega\) are connected in parallel across a potential difference. If P1 and P2 represent power dissipated in R 1 and R2 respectively, then the ratio P1 : P2 is
A
4 : 5
B
5 : 4
C
16 : 25
D
25 : 16
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35
Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks
A
i and ii
B
i and iv
C
ii and iii
D
iii and iv
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36
If two parallel conductors carry currents flowing in the same direction, the conducts will
A
attract each other
B
repel each other
C
both move in the same direction
D
have no effect on each other
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37
A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are
A
219 and 87
B
84 and 223
C
223 and 87
D
219 and 81
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38
If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then
A
no electron will be emitted
B
the few electrons emitted will have a maximum kinetic energy of 1eV
C
the few electrons emitted will have a maximum kinetic energy of 3eV
D
many electrons will be emitted
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39
A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?
A
3750J
B
2500J
C
3.75J
D
2.50J
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40
A
1.79cm
B
1.73cm
C
1.39cm
D
1.34cm
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