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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1990 - JAMB Physics Past Questions and Answers - page 5