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Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
The design of the thermostat of an electric iron is based on the
A
emmision of electrons from metals when heated
B
increase in size of metals when heated
C
increase in the density of metals when heated
D
change in the mass of metals when heated
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 #35035)
Physics
WAEC / WASSCE 2008
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A metal rod of length 50cm is heated from 40oC to 80oC. If the linear expansivity of the material is \(\alpha\), calculate the increase in length of the rod (in metres) in terms of \(\alpha\)
A
20\(\alpha\)
B
200\(\alpha\)
C
2000\(\alpha\)
D
20000\(\alpha\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(L_2 - L_1 = \alpha_1 (\theta_2 - \theta_1) = \alpha \times 0.5 \times 40 = 20 \alpha\)
Source: Myschool Past Questions Archive (Record #35041)
Physics
WAEC / WASSCE 2008
Linear Motion, Projectiles & Kinematics
Diagram
The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is
Attached Figure / Diagram
A
maximum
B
uniform
C
zero
D
terminal
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 #34983)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Diagram
Solution
The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?
Attached Figure / Diagram
A
i only
B
ii only
C
iii only
D
i and iii only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Moving the magnet changes flux, inducing emf (i) and current that deflects the galvanometer (ii). By Lenz’s law the induced current repels the approaching magnet, so (iii) is false.
Source: Myschool Past Questions Archive (Record #34986)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be
A
doubled
B
halved
C
four times as great
D
one-fourth as much
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 #35015)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Solution
An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.
A
0.60ms-1
B
0.67ms-1
C
2.00ms-1
D
3.33-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(M_1V_1 - (M_2V_2) = V(M_1 + M_2)\)
2 x 3 - 1 x 4 = V(2 + 1)
V = \(\frac{2}{3}\)
= 0.67ms-1
Source: Myschool Past Questions Archive (Record #35017)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
Solution
A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.
A
100Nm-2
B
200Nm-2
C
300Nm-2
D
400Nm-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
P = \(\frac{wt}{A} = \frac{200}{0.5 \times 1} = 400Nm^{-2}\)
This is because Area is inversely proportional to pressure, so an increase in pressure leads to a decrease in area and vice versa.
Source: Myschool Past Questions Archive (Record #34968)
Physics
WAEC / WASSCE 2008
Units, Measurements & Dimensional Analysis
A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that
A
it is very hot at the equator
B
the spring balance has expanded
C
the acceleration of free fall due to gravity varies with location
D
the mass of the body is reduced
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 #34969)
Physics
WAEC / WASSCE 2008
Elasticity, Density, Pressure & Fluids
Diagram
Solution
The diagram above illustrates a Hare's apparatus. \(\mathit{e}_1, \mathit{e}_2\) represent densities and \(\mathit{h}_1, \mathit{h}_2\) heights of columns of liquids. Which of the following equations is correct?
Attached Figure / Diagram
A
\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_1}{\mathit{e}_2}\)
B
\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}\)
C
\(\mathit{h}_1 = \frac{\mathit{e}_1 \mathit{e}_2}{\mathit{h}_2}\)
D
\(\mathit{h}_1 = \frac{\mathit{e}_1}{\mathit{h}_2 \mathit{e}_2}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{\mathit{h}_2}{\mathit{h}_2} = \mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}\)
Source: Myschool Past Questions Archive (Record #34982)
Physics
WAEC / WASSCE 2008
Temperature, Thermometry & Thermal Expansion
Solution
The cubic expansivity of a certain gas at constant pressure is \(\frac{1}{273} k^{-1}\). If a given mass of the gas is held at constant pressure and its volume at 0oC is 273m3, determine the volume of the gas at 273oC.
A
273m3
B
546m3
C
8193
D
10923
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(V_2 = V_1(B\theta + 1) = 273 (\frac{1}{373} \times 273 + 1)\)
= 546m3
Source: Myschool Past Questions Archive (Record #35046)
Physics
WAEC / WASSCE 2008
Calorimetry, Latent Heat & Change of State
Solution
Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]
A
4.57 minutes
B
5.02 minutes
C
7.30 minutes
D
10.04 minutes
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
t = \(\frac{MC\theta}{2} = \frac{1.5 \times 4200 \times 50}{5 \times 230}\)
= 273.91s or 4.57 mins
Source: Myschool Past Questions Archive (Record #35048)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
The working principle of a pressure cooker is based on the
A
increase in the volume of steam inside it
B
complete trapping of heat inside it
C
increase in the pressure of the pot
D
decrease in the pressure of the pot
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 #35050)
Physics
WAEC / WASSCE 2008
Current Electricity & Electric Circuits
It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the
A
temperature is higher
B
pressure is lower
C
humidity is higher
D
temperature is constant
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 #35052)
Physics
WAEC / WASSCE 2008
Waves, Sound & Vibrations
Light is considered as a transverse wave because it travels
A
through material without causing disturbance of the medium
B
through space with constant speed
C
in a direction parallel to the plane containing the electric and magnetic fields
D
in a direction perpendicular to the plane containing the electric and magnetic fields
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 #35055)
Physics
WAEC / WASSCE 2008
Waves, Sound & Vibrations
In the day time, it is possible to see under shady areas such as under a tree because light has undergone
A
internal reflection
B
refraction
C
diffraction
D
diffuse reflection
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 #35057)