1999 - JAMB Physics Past Questions and Answers - page 4
31
A semiconductor diode is used in rectifying alternating current into direct current mainly because it
A
allows current to flow in either direction
B
is non-linear
C
offers a high input resistance
D
allows current to flow only in one direction
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32
if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
A
∆x ∆Px ≥ h
B
∆x ∆Px = 0
C
∆x ∆Px < h
D
∆x ∆Px = ∞
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33
If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Pa is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
A
∆x ∆Px ≥ h
B
∆x ∆Px = 0
C
∆x ∆Px < h
D
∆x ∆Px = ∞
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34
A
8.0 ms-2, 4,0 ms-2
B
4.0 ms-2, 8.0 ms-2
C
4.0 ms-2, 2.0 ms-2
D
2.0 ms-2, 4.0 ms-2
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35
A
13.3N
B
20.0N
C
40.0N
D
80.0N
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36
A
The solid will fall over if the vertical line through G lies outside the base
B
The solid will fall over if the vertical line through lies inside the base
C
The solid will not fall over if the vertical line through G lies outside the base
D
The solid can never fall over
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37
A
both valves are open
B
P is open while Q is closed
C
P is closed while Q is open
D
Both valves are closed
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38
A
15 cm3
B
25 cm3
C
35 cm3
D
45 cm3
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39
A
3.0 x 107Hz
B
9.0 x 107Hz
C
1.0 x 109Hz
D
3.0 x 109Hz
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40
A
binocular
B
spectrometer
C
periscope
D
projector
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