2017 - WAEC Physics Past Questions and Answers - page 5

41

The diagram above illustrates two charged bodies, X and Y seperated by a distance r. Each body has charge q and mass m. Which of the following statements about the electrostatic force \(F_{e}\) and fravitational force \(F_{g}\) acting between the bodies is correct?

A
\(F_{e}\) is attraction while \(F_{g}\) is repulsion
B
Both \(F_{e}\) and \(F_{g}\) are that of repulsion
C
Both \(F_{e}\) and \(F_{g}\) is that of attraction
D
\(F_{e}\) is repulsion while \(F_{g}\) is attraction
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42

The opposition offered to an alternating current in a C-R series circuit is known as

A
impedance
B
resistance
C
reactance
D
friction
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43

Which of the following pairs of concepts constitutes complementary variables as expressess by the Heinsberg uncertainty principle?

A
Momentum and time
B
Energy and acceleration
C
Position and momentum
D
Velocity and Momentum
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44

The nucleon number of an atom is the total number of

A
electrons and protons
B
electrons and neutrons
C
neutrons minus electrons
D
protons and neutrons
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45
n = \(\alpha\) 0.06eV
E=3 -1.6eV
E=2 -3.7eV
E=1 -5.5eV
E=0 -10.4eV

The energy levels in the mercury atom is illustrated in the table above. Calculate the ionisation energy of the atom.

A
+21.2eV
B
+10.4eV
C
-10.4eV
D
-21.2eV
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46

Which of the following statements about Gamma radiation is correct? Gamma radiation can

A
be seen by the naked eye
B
not pass through an aluminium foil
C
be present naturally in our surroundings
D
be used as a tracer
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47
Radio wave Micro wave Infrared wave P Q R Gamma Ray

The table above shows the components of electromagnetic spectrum in order of increaasing frequency.Which of the following sets correctly identifies P, Q, R respectively?

A
Visible, ultraviolet, X-ray
B
X-ray, visible, ultraviolet
C
Ultraviolet, visible, X-ray
D
X-ray, ultraviolet, visible
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