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1999 - JAMB Physics Past Questions and Answers - page 5

41
The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are
A
North - North
B
North - South
C
South - North
D
South - South
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42
In the circuit above, the ammeter reads a current of 5.0 A when R = 8Ω and reads 7.0A when R = 5Ω. The value of the unknown resistance X is
A
10.0Ω
B
7.5Ω
C
5.0Ω
D
2.5Ω
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43
In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is
A
3.0 x 104J
B
3.0 x 102J
C
2.5 x 10-2J
D
6.0 x 10-3J
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44
In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P1 and P2 dissipated by R1 and R2
A
R2/R1
B
R1/R2
C
R1+R2/R1
D
R1+R2/R2
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45
In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and that across the resistor is 6Vr.m.s. The effective voltage is
A
2V
B
10V
C
14V
D
48V
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46
The inner diameter of a test tube can be measured accurately using a
A
micrometer screw guage
B
pair of dividers
C
metre rule
D
pair of vernier calipers
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47
Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.
A
1 : 4
B
2 : 1
C
2 : 3
D
2 : 5
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48
Particles of mass 10-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is
A
2 N
B
20 N
C
200 N
D
400 N
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49
a lead bullet of mass 0.05kg is fired with a velocity of 200ms-1 into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is
A
50 J
B
100 J
C
150 J
D
200 J
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50
A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)
A
5 J
B
10 J
C
15 J
D
20 J
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