2016 - WAEC Physics Past Questions and Answers - page 5
41
A 10\(\mu\)C charge moves with a velocity of 1.0 x 105 ms-1 at right angle to a uniform magnetic field of flux density 5.0 x 10-4T. Calculate the force on the charge
A
5.0 x 10-5N
B
5.0 x 10-4N
C
5.0 x 105N
D
5.0 x 106N
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42
Which of the following statements is not correct about steel and soft iron?
A
steel is more magnetized than soft iron
B
permanent magnets are usually made of steel
C
soft iron is more readily magnetized than steel
D
soft iron more readily loses its magnetism than steel
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43
What determines the polarity at the ends of an electromagnet? The
A
magnitude of the current passing through the wire
B
material of the core of the magnet
C
material of the coil
D
direction of current in the wire
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44
How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79}Au \leftarrow ^{198}_{80}Hg\)?
A
1
B
2
C
3
D
5
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45
The phenomenon by which two light atomic nuclear combine to form a heavy nuclide with the release of energy is known as
A
radioactivity
B
nuclear fusion
C
nuclear fission
D
chain reaction
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46
In a p-type semiconductor, the
A
number of holes are equal to the number of electrons
B
electrical resistivity increases
C
electrons are the majority charge carriers
D
holes are the majority charge carriers
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47
Let \(\Delta\)x be the uncertainty in the measurements of position and \(\Delta\)p the uncertainty in measurement of momentum. The uncertainty principle relation is given as
A
\(\Delta\)x . \(\Delta\)p = h
B
\(\Delta\)x . \(\Delta\)p \(\leq\) = h
C
\(\Delta\)x . \(\Delta\)p \(\geq\) = h
D
\(\Delta\)x . \(\Delta\)p > h
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