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
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
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\(^3\)
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
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
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
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
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
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
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
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