2018 - JAMB Physics Past Questions and Answers - page 3

21

The pitch of an acoustic device can be increased by

A
decreasing the loudness
B
increasing the intensity
C
increasing the frequency
D
decreasing the intensity
correct option: c
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22

One of the features of the fission process is that

A
it leads to chain reaction
B
its products are not radioactive
C
neutrons are not released
D
the of the masses of the reactants equals the sum of the masses of the products
correct option: a
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23

The linear expansivity of brass is 2 x 10\(^{-5}\) C\(^{-1}\). If the volume of a piece of brass is 15.00cm at 0°C, what is the volume at 100°C

A
16.03cm\(^3\)
B
15.09cm\(^3\)
C
16.00cm\(^3\)
D
15.03cm\(^3\)
correct option: d
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24

A lead bullet of mass 0.05 kg is fired with a velocity of 200 ms into a lead block of mass 0.95 kg. Given that the lead block can move freely. the final kinetic energy after impact is

A
100J
B
A. 150J
C
50J
D
200J
correct option: c
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25

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

A
30V
B
70V
C
50V
D
40V
correct option: d
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26

If the fraction of the atoms of a radioactive material left after 120years is \(\frac{1}{64}\), what is the half-life of the material?  \(\frac{1}{64}\)

A
20 years
B
10 years
C
2 years
D
24 years
correct option: a
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27

In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?

A
U
B
T
C
R and T
D
Q and R
correct option: b
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28

The time rate of loss of heat by a body is proportional to the

A
temperature of its surroundings
B
temperature of the body
C
difference in temperature between the body and its surroundings
D
ratio of the temperature of the body to that of its surroundings
correct option: c
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29

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

A
no charge and a zero potential
B
a positive charge and a zero potential
C
a negative charge and a positive potential
D
a negative charge and a negative potential
correct option: d
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30

Electrical appliances in homes are normally earthed so that

A
a person touching the appliances is safe from electric shock
B
both the a.c. and d.c. sources can be used
C
the appliances are maintained at a higher pd than the earth
D
the appliances are maintained at a lower pd than the earth
correct option: a
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