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
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
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
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
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
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
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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