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Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
Which of the following quantities are dimensionally independent?
I. Dielectric constant II. Momentum III. Efficiency IV. Refractive index
A
I and II
B
II, III and IV
C
I, II, III and IV
D
I, III and IV
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The quantities Efficiency, Dielectric constant and Refractive index are dimensionless.
Source: Myschool Past Questions Archive (Record #49662)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
A body is projected with an initial velocity u at angle \(\theta\) to the horizontal. If \(R_{max}\) is the maximum range of the projectile, what does the relation \(\frac{u^{2}}{R_{max}}\) represent?
A
The vertical distance covered
B
Acceleration due to gravity
C
The horizontal distance covered
D
The acceleration of the body
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(R_{max} = \frac{u^{2}}{g}\)
Hence, \(g = \frac{u^{2}}{R_{max}}\)
Source: Myschool Past Questions Archive (Record #49664)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
An object at rest is said to possess
A
potential energy
B
kinetic energy
C
chemical energy
D
electrical energy
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Potential energy is the energy that is stored in an object due to its position relative to some zero position.
Source: Myschool Past Questions Archive (Record #49675)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
According to Newton's law of cooling, the heat energy lost per unit area of a body depends on the
I. Surface area
II. Nature of the surface
III. Temperature of the surface
IV. Excess temperature over the surroundings
A
I and II only
B
II and IV only
C
I,II and III
D
I, II and IV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The rate of cooling of liduid according to Newton's law of cooling depends on:
- Temperature of the liquid
- Temperature of the enclosure
- The area of the exposed surface
- The nature and extent of the surface of the containing vessel
Source: Myschool Past Questions Archive (Record #49680)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Diagram
The graph of density against temperature for water is correctly illustrated by
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 #49683)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
A football is kicked at an angle of 45^\circ to the horizontal over a defense line up with a velocity of 15\(ms^{-1}\). Calculate the magnitudeof horizontal velocity of the ball at its highest point [Neglect friction, g = 10\(ms^{-2}\)].
A
0.0\(ms^{-1}\)
B
5.6\(ms^{-1}\)
C
10.6\(ms^{-1}\)
D
15.0\(ms^{-1}\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The horizontal component of velocity, \(V_{x}\), is unaffected by the acceleration of free fall and remains constant.
\(V_{x} = U_{x} = Ucos\theta\)
= \(15 \times cos45 = 15\times 0.7071\)
\(\approxeq 10.6ms^{-1}\)
Source: Myschool Past Questions Archive (Record #49687)
Physics
WAEC / WASSCE 2018
Thermal Physics
Solution
The ice point on the absolute scale of temperature is
A
0K
B
32K
C
100K
D
273K
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The ice point, where water freezes, is 0^\circC, which corresponds to 273 K on the absolute (Kelvin) scale.
Source: Myschool Past Questions Archive (Record #49694)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
Which of the following factors does not increase the rate of evaporation of water in a lake?
A
Increase in the pressure of the atmosphere
B
Rise in temperature
C
Increase in the surface area of the lake
D
Increase in the speed of the wind
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The rate of evaporation is increased by the lowering of atmospheric pressure and not its increase. Every other factor stands, for the increase of evaporation process.
Source: Myschool Past Questions Archive (Record #49697)
Physics
WAEC / WASSCE 2018
Waves and Optics
Solution
The bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the bob.
A
0.125Hz
B
1.25Hz
C
7.50Hz
D
8.00Hz
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
10 complete oscillations = 8.0s
1 complete oscillation (period) = \(\frac{8}{10}\)s
Frequency = \(\frac{1}{period}\) = \(\frac{1}{0.8} = 1.25Hz\)
Source: Myschool Past Questions Archive (Record #49698)
Physics
WAEC / WASSCE 2018
Waves and Optics
Solution
Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination
A
30°
B
45°
C
60°
D
90°
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Formula for number of images = \(\frac{360}{n} - 1\)
where n is the angle of inclination.
Given the number of images = 11, we have
\(\frac{360}{n} - 1 = 11\)
\(\frac{360}{n} = 12\)
\(n = \frac{360}{12} =30^\circ\)
Source: Myschool Past Questions Archive (Record #49731)
Physics
WAEC / WASSCE 2018
Heat Energy & Temperature
The pitch of a note is not affected by
A
frequency
B
tension in a vibrating string
C
mass of a vibrating string
D
amplitude of sound wave
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 #49738)
Physics
WAEC / WASSCE 2018
Electricity and Magnetism
Solution
When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an
A
electroscope
B
electrophorus
C
capacitor
D
cell
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Most capacitors contain at least two electrical conductors often in the form of metallic plates or surfaces separated by a dielectric medium.
Source: Myschool Past Questions Archive (Record #49743)
Physics
WAEC / WASSCE 2018
Electricity and Magnetism
Diagram
Solution
Which electrical device is illustrated above?
Attached Figure / Diagram
A
a.c. generator
B
a.c. motor
C
d.c. generator
D
d.c. motor
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
In a DC generator, the coil rotates within a magnetic field, and the commutator is employed to convert the alternating current generated in the coil into direct current. The presence of the magnetic field, represented by the north (N) and south (S) poles, further confirms its identification as a DC generator.
Source: Myschool Past Questions Archive (Record #49748)
Physics
WAEC / WASSCE 2018
Mechanics and Properties of Matter
Solution
A simple barometer is constructed using a liquid \(Q_{1}\) of density 16.2\(g/cm^{3}\). Calculate the least lenth of the tube to be used to measure pressure of 1.5atm. [Density of mercury = 13.6\(g/cm^{3}\), 1atm = 76.0 cm of Mercury]
A
1358mm
B
957mm
C
760mm
D
638mm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Let \(h_{Q}\) and \(\rho_{Q}\) be the least length and the density of \(Q_{1}\)
while \(h\) and \(\rho\) are the length and density of mercury respectively.
\(h\times \rho \times g = h_{Q} \times \rho_{Q} \times g\)
\(76cm \times 13.6 \times 10 = h_{Q} \times 16.2 \times 10\)
\(h_{Q} = \frac{76\times13.6\times10}{16.2\times10}\)
\(h_{Q} = \frac{10336}{162}\)
\(h_{Q} \approxeq 63.8cm = 638mm\)
Source: Myschool Past Questions Archive (Record #49762)
Physics
WAEC / WASSCE 2018
Thermal Physics
Diagram
Solution
The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.
Attached Figure / Diagram
A
3.3°C
B
7.0°C
C
13°C
D
30.0°C
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Let the room temperature be X.
We have, \(\frac{3-0}{10-0} = \frac{X-0}{100-0}\)
\(\frac{3}{10} = \frac{X}{100}\)
\(X = \frac{3 \times 100}{10}\)
= 30^\circC
Source: Myschool Past Questions Archive (Record #49705)