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Physics
WAEC / WASSCE 2011
Linear Motion, Projectiles & Kinematics
The area under a velocity-time graph represents
A
final velocity attained
B
distance covered
C
acceleration
D
workdone
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 #35412)
Physics
WAEC / WASSCE 2011
Circular Motion, Gravitation & Simple Harmonic Motion
In the absence of gravitational force, the weight of the body is
A
its mass
B
zero
C
its density
D
its volume
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 #35413)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?
A
density
B
expansivity
C
conductivity
D
opacity
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Expansion and Contraction: The density of mercury affects how it expands and contracts with temperature changes. A liquid with a consistent and predictable expansion rate is essential for accurate temperature readings.
Calibration: The density of the liquid must be known to calibrate the thermometer accurately. This ensures that the scale on the thermometer corresponds correctly to temperature changes.
Thermal Conductivity: While conductivity can influence how quickly a liquid reaches thermal equilibrium with its surroundings, it is not as critical as density for the overall accuracy of the thermometer.
But in choosing mercury as a thermometric liquid, the density of mercury is not usually considered.
Source: Myschool Past Questions Archive (Record #35414)
Physics
WAEC / WASSCE 2011
Work, Energy, Power & Simple Machines
Solution
A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms-2]
A
750.0J
B
225.0J
C
75.0J
D
22.5J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
K.E = P.E = mgh
= 0.3 x 10 x 100 - 0.3 x 10 x 75
= 75J
Source: Myschool Past Questions Archive (Record #35415)
Physics
WAEC / WASSCE 2011
Equilibrium of Forces, Moments & Flotation
Solution
A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule
A
60g
B
80g
C
120g
D
200g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
m = \(\frac{25 \times 120}{15}\)
= 200g
Source: Myschool Past Questions Archive (Record #35434)
Physics
WAEC / WASSCE 2011
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
Two simple pendulum A and B of equal lengths and of masses 5g and 20g respectively are located in the same environment. The periods TA and TB of their respective oscillations are related by the equations
A
TA = 4TB
B
TA = \(\frac{1}{4} T_B\)
C
TA = TB
D
TA = 5TB
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The period of a simple pendulum is dependent on the frequency. It is also dependent on the length of the pendulum but not the mass. Since the two pendulums have equal length, then their periods are equal as well.
Source: Myschool Past Questions Archive (Record #35436)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
An object of mass 5.0 kg moves with a velocity of 10ms-1. Calculate its momentum.
A
50.0 kgms-1
B
15.0 kgms-1
C
2.0 kgms-1
D
0.5 kgms-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Momentum = MV
= 5 x 10 = 50
Source: Myschool Past Questions Archive (Record #35438)
Physics
WAEC / WASSCE 2011
Linear Motion, Projectiles & Kinematics
Solution
A coin is pushed from the edge of a laboratory bench with a horizontal velocity of 15.0 ms-1. If the height of the bench from the floor is 1.5m, calculate the distance from the foot of the bench to the point of impact with the floor [g = 10ms-2]
A
0.75m
B
2.25m
C
8.22m
D
15.00m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
S = U\(\sqrt{\frac{2h}{g}}\)
= 15\(\sqrt{\frac{2 \times 1.5}{10}}\)
= 8.22m
Source: Myschool Past Questions Archive (Record #35440)
Physics
WAEC / WASSCE 2011
Work, Energy, Power & Simple Machines
Which of the following statements correctly defines a simple machine? A device
A
that can produce electric current
B
which can only carry people from one place to another
C
with which work can be done easily
D
which changes the state of rest or of uniform motion of an object
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 #35441)
Physics
WAEC / WASSCE 2011
Work, Energy, Power & Simple Machines
Solution
The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency
A
600.0N
B
40.0N
C
24.0N
D
20.0N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V.R = \(\frac{R}{r} = \frac{30}{6} = 5\)
\(\gamma = \frac{M.A}{V.R} \times \frac{100}{1} \)
M.A = \(\frac{100 \times 5}{100} = 5\)
Effort = \(\frac{L}{M.A} = \frac{120}{5}\)
= 24N
Source: Myschool Past Questions Archive (Record #35442)
Physics
WAEC / WASSCE 2011
Temperature, Thermometry & Thermal Expansion
A hypsometer is used for determining
A
steam point
B
relative humidity
C
ice point
D
relative density
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 #35443)
Physics
WAEC / WASSCE 2011
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following equations shows how how the linear expansivity (\(\alpha\)) and the cubic expansivity (\(\gamma\)) of a material are related?
A
\(\gamma = \alpha\)
B
\(\gamma = 1 - \alpha\)
C
\(\gamma = 2 \alpha\)
D
\(\gamma = 3 \alpha\)
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 #35445)
Physics
WAEC / WASSCE 2011
Temperature, Thermometry & Thermal Expansion
Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0oC and 4oC. ii. There is expansion between 0oC and 100oC. iii. The volume is minimum at 4oC. iv. The volume is maximum at 4oC
A
i and ii only
B
ii and iii only
C
i and iii only
D
ii and iv only
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 #35447)
Physics
WAEC / WASSCE 2011
Gas Laws & Heat Transfer
Solution
Which of the following assumptions is not valid for an ideal gas ?
A
molecules of a particular gas are identical
B
molecules moves freely throughout the volume of the container
C
force of attraction between molecules is negligible
D
molecules move at constant speed between collisions
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
In an ideal gas, molecules do not move at constant speed between collisions. Their speeds vary due to elastic collisions with other molecules and the walls of the container. The other assumptions—identical molecules, free movement throughout the container, and negligible forces of attraction—are valid for an ideal gas.
Source: Myschool Past Questions Archive (Record #35449)
Physics
WAEC / WASSCE 2011
Work, Energy, Power & Simple Machines
Solution
A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied
A
0.2s
B
2.5s
C
25.0s
D
250.0s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
t = \(\frac{fs}{p} = \frac{20 \times 500}{0.4 \times 1000} = 25s\)
Source: Myschool Past Questions Archive (Record #35452)