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Physics
WAEC / WASSCE 2017
Waves and Optics
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
Waves and Optics
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 and Optics
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
Electricity and Magnetism
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
Mechanics and Properties of Matter
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
Electricity and Magnetism
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
Electricity and Magnetism
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
Electricity and Magnetism
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
Electricity and Magnetism
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Electricity and Magnetism
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
Mechanics and Properties of Matter
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
Electricity and Magnetism
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)