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Physics
WAEC / WASSCE 2017
Magnetism, Electromagnetism & AC Circuits
Diagram
Two bar magnets are placed near each other. Which of the following diagrams correctly illustrates the magnetic field pattern formed by the pair?
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #50034)
Physics
WAEC / WASSCE 2017
Electrostatics & Capacitors
Solution
The force per unit charge experienced at a point in a field is the
A
gravitational field strength
B
electric potential
C
electric field intensity
D
magnetic field strength
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Electric intensity at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.
Source: Myschool Past Questions Archive (Record #50035)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
Solution
Which of the following objects is not a conductor of electricity?
A
The Earth
B
Human body
C
Iron rod
D
Dry wood
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Dry wood is rather an insulator and not a conductor.
Source: Myschool Past Questions Archive (Record #50038)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
Diagram
Solution
A circuit is set up as shown in the diagram above. When the key is closed, the ammeter reading will be
Attached Figure / Diagram
A
6A
B
4A
C
2A
D
1A
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The resistors are connected both in parallel and series. To calculate the total resistance, we have:
For the parallel connection: \(\frac{1}{R} = \frac{1}{1} + \frac{1}{1}\)
\(\frac{1}{R} = 2 \implies R = 0.5\Omega\)
For the series connection: \(R_{total} = (1 + 0.5)\Omega = 1.5\Omega\)
Recall, \(V=IR\)
\(3 = 1.5I \implies I = \frac{3}{1.5} =2A\)
Source: Myschool Past Questions Archive (Record #50045)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
The main reason why a.c. is transmitted at very high voltage and low current is that
A
flows faster through the conductor
B
can be stepped down
C
is cheaper to generate
D
reduces heat loss
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50089)
Physics
WAEC / WASSCE 2017
Magnetism, Electromagnetism & AC Circuits
The opposition offered to an alternating current in a C-R series circuit is known as
A
impedance
B
resistance
C
reactance
D
friction
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #50093)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
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
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #50095)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
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
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50096)
Physics
WAEC / WASSCE 2017
Scalars, Vectors & Relative Motion
Which of the following statements is/ are correct?
I. Gravitational potential due to a mass at a point a distance r away is proportional to \(r^{2}\)
II. Gravitational field strength is a vector quantity
III. Gravitational intensity is proportional to the weight of a unit mass.
A
I, II and III
B
III only
C
II only
D
I only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50065)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
Diagram
The diagrams above illustrate electrical connections to the element of an electric pressing iron.In which of the connections is the fuse correctly fixed?
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #50072)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
Solution
A lamp rated 100W, 240V is lit for 5hours. Calculate the cost of lighting the lamp if 1kWh of electrical energy cost N5.
A
N2.50
B
N3.20
C
N6.50
D
N9.60
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Power = 100W; Voltage = 240V; Time = 5 hours
Total energy used = Power x time = 100 x 5 = 500wh
converting to kwh, we have
\(\frac{500}{1000} = 0.5kWh \times N5 = N2.50\)
Source: Myschool Past Questions Archive (Record #50082)
Physics
WAEC / WASSCE 2017
Current Electricity & Electric Circuits
Diagram
Solution
A battery of e.m.f 3.0V is connected across a potentiometer wire AB of length 10\(\Omega m^{-1}\) as illustrated in the diagram above. If the jockey J makes contact at the 30cm mark, determine the resistance of length AJ and voltage across AJ.
Attached Figure / Diagram
A
3.0\(\Omega\); 0.9V
B
3.0\(\Omega\); 3.0V
C
3.3\(\Omega\); 0.3V
D
3.3\(\Omega\); 9.0V
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = 3.0V; \(\frac{R}{l} = 10\Omega m^{-1}\)
l = 30cm = 0.3m; R = \(10\Omega m^{-1} \times 0.3m = 3\Omega\)
\(\frac{E}{V} = \frac{l_{1}}{l_{2}} \implies \frac{3}{V} = \frac{1}{0.3}\)
= \(\frac{3\times 0.3}{1} = 0.9V\)
Source: Myschool Past Questions Archive (Record #50088)
Physics
WAEC / WASSCE 2017
Atomic, Quantum, Nuclear Physics & Electronics
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
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #50098)
Physics
WAEC / WASSCE 2017
Atomic, Quantum, Nuclear Physics & Electronics
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
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50100)
Physics
WAEC / WASSCE 2017
Atomic, Quantum, Nuclear Physics & Electronics
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
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #50102)