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2006 - WAEC Physics Past Questions and Answers - page 5

41

An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament

A
480\(\Omega\)
B
360\(\Omega\)
C
60\(\Omega\)
D
2\(\Omega\)
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42

Which of the following statements about a bar magnet is correct?

A
iron fillings cling uniformly along the length of a bar magnet
B
the magnetic properties are more pronounced at the middle of a magnet
C
it is impossible to have the same poles at the end of a magnet
D
the magnetic properties are more pronounced at points near the end of the bar
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43

The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?

A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
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44

The breaking up of an atomic nucleus into the fragment of nearly equal size is known as

A
nuclear fusion
B
nuclear fission
C
thermonuclear reaction
D
natural radioactivity
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45

A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10-31kg, e = 1.6 x 10-19C]

A
4.2 x 108ms-1
B
1.9 x 108ms-1
C
4.2 x 105ms-1
D
1.8 x 105ms-1
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46

A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?

A
21
B
18
C
15
D
12
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47

Fusion is not usually used for generating electric power because

A
no energy is released when fusion takes place
B
very high temperatures are required to initiate fusion reaction
C
the raw materials needed is not easily available
D
heavy nuclei are involved
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48

An atom (^{234}_{91} P) emits a gamma radiation. The resultant nuclide is

A
\(^{230}_{90} Th\)
B
\(^{234}_{91} Pa\)
C
\(^{234}_{90} Th\)
D
\(^{234}_{89} Ac\)
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49

The diagram above shows the speed-time graph of a car.If the car covered a total distance of 600m in 25s, calculate its maximum speed

A
30ms-1
B
25ms-1
C
20ms-1
D
15ms-1
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50

Determine the magnitude of P in the diagram above

A
16N
B
20N
C
32N
D
40N
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