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Physics
WAEC / WASSCE 2017
Reflection, Refraction & Dispersion of Light
Solution
A ray of light incident at an angle \(\theta\) in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]
A
41.8°
B
48.2°
C
60.8°
D
90.0°
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\eta = \frac{1}{sin\theta}\)
\(1.5 = \frac{1}{sin\theta}\)
\(sin\theta = \frac{1}{1.5} = 0.667\)
\(\theta = sin^{-1}(0.667) = 41.835^\circ\)
\(\approxeq 41.8^\circ\)
Source: Myschool Past Questions Archive (Record #50018)
Physics
WAEC / WASSCE 2017
Waves, Sound & Vibrations
Diagram
Solution
The diagram above illustrates a wave setup between two fixed ends 4.0m apart. If the speed of the wave is 1.0\(ms^{-1}\), its wavelength and frequency respectively are
Attached Figure / Diagram
A
1m; 0.25Hz
B
2m; 0.25Hz
C
2m; 0.50Hz
D
4m; 0.50Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
For the 4th harmonic, \(L = 2\lambda\)
\(4m = 2\lambda \implies \lambda = \frac{4m}{2}\)
=\(2m\)
Recall, \(v = f\lambda\)
\(1 = f \times 2 \implies f = \frac{1}{2}\)
= 0.50Hz
Source: Myschool Past Questions Archive (Record #50021)
Physics
WAEC / WASSCE 2017
Reflection, Refraction & Dispersion of Light
Solution
Two plane mirrors are inclined at an angle 20^\circ to each other. Determine the number of images formed when an object is placed between them.
A
17
B
18
C
19
D
20
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The number of images formed = \(\frac{360}{n}\) where the value gotten is odd
else, = \(\frac{360}{n} -1\).
Solving, we have that \(\frac{360}{20} = 18\)
Hence, the no of images formed is 18 - 1 = 17.
Source: Myschool Past Questions Archive (Record #50022)
Physics
WAEC / WASSCE 2017
Lenses & Optical Instruments
Solution
A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.
A
6.6cm
B
11.1cm
C
13.3cm
D
20.0cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given, image size = 3U
object size = U
focal length = 10cm
lens to object distance = \(\frac{focal length \times object size}{image size}\)
= \(\frac{10 \times u}{3u} = 3.33\)
distance between image and object = 10 + 3.33 = 13.33cm
Source: Myschool Past Questions Archive (Record #50030)
Physics
WAEC / WASSCE 2017
Waves, Sound & Vibrations
Solution
The inverse of the time required for a wave to complete one full cycle is called
A
wavelength
B
period
C
frequency
D
amplitude
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The time required to complete one full cycle is the period; the inverse of the period gives the frequency.
Source: Myschool Past Questions Archive (Record #50033)
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)