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1990 - JAMB Physics Past Questions and Answers - page 5

41
A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?
A
200
B
1200
C
1600
D
2400
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42
The photocell works on the principle of the
A
voltaic cell
B
emision of electrons by incident radiation
C
emision of protons by incident electrons
D
photographic plate
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43
What is the reading of the vernier scale above
A
1.88cm
B
1.80cm
C
1.28cm
D
1.97cm
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44
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
A
2√3/3N
B
√2N
C
4√3/3
D
2V3N
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45
What is the average velocity of the sprinter whose velocity time graph is as shown above
A
85.0ms-1
B
17.0ms-1
C
8.5ms-1
D
1.7ms-1
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46
A force of 5N act at a point Y on a rod XYZ as shown in the diagram above, if XY is 2m. What is the moment of the force about point X?
A
0Nm
B
3Nm
C
7Nm
D
10Nm
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