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Physics
WAEC / WASSCE 2001
Equilibrium of Forces, Moments & Flotation
Solution
An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object
A
20N
B
10N
C
6N
D
4N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Upthrust = Weight of fluid displayed = 6N
Source: Myschool Past Questions Archive (Record #33865)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
Which of the following statements about pressure is not correct? pressure
A
increases with an increase in surface area
B
decreases with an increase in surface area
C
increases with a decrease in surface area
D
increases with an increase in the applied force
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Pressure = \(\frac{\text{Force}}{\text{cross-sectional area}}\)
From the equation above Option A is incorrect: increases with an increase in surface area
Source: Myschool Past Questions Archive (Record #33866)
Physics
WAEC / WASSCE 2001
Equilibrium of Forces, Moments & Flotation
Solution
The apparent weight of a body fully immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. [Density of water = 1000kgm-3, g = 10ms-2]
A
8.9 x 10-3m3
B
6.4 x 10-3m3
C
3.2 x 10-3m3
D
3.0 x 10-3m3
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Upthrust = 96 - 32 = 64N
mass(m) = \(\frac{64}{10} = 6.4 kg\)
volume = \(\frac{mass}{Density} = \frac{6.4}{1000}\)
= 6.4 x 10-3m3
Source: Myschool Past Questions Archive (Record #33867)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the friction force on the block
A
0.3N
B
0.5N
C
3.0N
D
5.0N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given that:
Weight of the block: 15N
Horizontal force applied: 3N
Since the applied force (3 N) is less than the maximum static friction (which can be greater than or equal to the weight of the block), the friction force will match the applied force to prevent motion
Therefore, The friction force on the block is: 3N
Source: Myschool Past Questions Archive (Record #33868)
Physics
WAEC / WASSCE 2001
Linear Motion, Projectiles & Kinematics
Solution
Which of the following equations represents the distance x, travelled by a body moving on a straight road with a constant speed? [The other symbol have their usual meanings]
A
x = Ut + \(\frac{1}{2}t^2\)
B
x = Ut
C
x = \(\frac{V^2 - U^2}{2a}\)
D
x = -\(\frac{1}{2} at^2\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
For a body moving at a constant speed, the distance x traveled can be represented by the equation:
x = U t
(constant speed = zero acceleration)
Source: Myschool Past Questions Archive (Record #33869)
Physics
WAEC / WASSCE 2001
Waves, Sound & Vibrations
Solution
The amplitude of the motion of a body performing simple harmonic motion decreases with time because
A
friction force dissipate the energy of motion
B
the frequency of oscillation varies with time
C
the period of oscillation varies with time
D
energy is supplied by some external agency
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The amplitude of the motion of a body performing simple harmonic motion (SHM) decreases over time primarily due to energy loss, often caused by friction or other resistive forces. Therefore OPTION A is correct.
Source: Myschool Past Questions Archive (Record #33870)
Physics
WAEC / WASSCE 2001
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
The amplitude of a particle executing simple harmonic motion in 5cm while its angular frequency is 10 rad s-1. calculate the magnitude of the maximum acceleration of the particle
A
0.25ms-2
B
0.50ms-2
C
2.00ms-2
D
5.00ms-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
amax = \(\omega^2 r = 10^2 \times \frac{5}{100} = 5ms^{-2}\)
Source: Myschool Past Questions Archive (Record #33872)
Physics
WAEC / WASSCE 2001
Newton's Laws, Momentum & Collisions
Solution
The time rate of change of momentum is
A
impulse
B
force
C
power
D
pressure
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The time rate of change of momentum is defined as force.
Source: Myschool Past Questions Archive (Record #33873)
Physics
WAEC / WASSCE 2001
Work, Energy, Power & Simple Machines
Solution
Which of the following statements about elastic collision is correct?
A
momentum is lost due to the sound produced
B
loss of momentim is equal to loss in kinetic energy
C
both kinetic energy and momentum are conserved
D
kinetic energy is lost while momentum is conserved
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
In an elastic collision, both kinetic energy and momentum are conserved.
Therefore, the correct answer is C. Both kinetic energy and momentum are conserved.
Source: Myschool Past Questions Archive (Record #33874)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
Electrical resistance is a property of an electrical energy to be converted into
A
mechanical energy
B
heat energy
C
magnetic energy
D
chemical energy
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical resistance is a property that causes electrical energy to be converted into heat energy
Therefore, the correct option is B heat energy.
Source: Myschool Past Questions Archive (Record #33875)
Physics
WAEC / WASSCE 2001
Work, Energy, Power & Simple Machines
Solution
A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine
A
10.0
B
13.3
C
17.5
D
25.0
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
M.A = \(\frac{load}{effort} \frac{5000N}{500N} = 10\)
V.R = \(\frac{M.A \times 100}{V} = \frac{10 \times 100}{75} = 13.3\)
Source: Myschool Past Questions Archive (Record #33876)
Physics
WAEC / WASSCE 2001
Work, Energy, Power & Simple Machines
Solution
A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]
A
21
B
38
C
48
D
151
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
P = \(\frac{25}{50} = 0.5\)
V.R = \(\frac{2\pi D}{p} = \frac{2 \times 3.142 \times 12}{0.5}\)
= 151
Source: Myschool Past Questions Archive (Record #33880)
Physics
WAEC / WASSCE 2001
Equilibrium of Forces, Moments & Flotation
Diagram
Solution
a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]
Attached Figure / Diagram
A
32.0N
B
26.7N
C
16.0N
D
13.3N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
E x 3 = 80 x 0.5
E3 = 40
E = \(\frac{40}{3} = 13.3N\)
Source: Myschool Past Questions Archive (Record #33883)
Physics
WAEC / WASSCE 2001
Temperature, Thermometry & Thermal Expansion
Solution
A resistance thermometer has a resistance of 20\(\Omega\) at 0oC and 85\(\Omega\) at 100oC. If its resistance is 52\(\Omega\)in a medium, calculate the corresponding temperature
A
49.2oC
B
60.6oC
C
80.0oC
D
84.7oC
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
85\(\Omega\) ........100oC
52\(\Omega\) ........\(\theta\)oC
20\(\Omega\) ........0oC
\(\frac{52 - 20}{85 - 20} = \frac{\theta - 0}{100 - 0}\)
\(\theta = \frac{32 \times 100}{65} = 49.2^oC\)
Source: Myschool Past Questions Archive (Record #33890)
Physics
WAEC / WASSCE 2001
Gas Laws & Heat Transfer
Solution
A given mass of an ideal gas has a pressure of 500Nm-2 at -13ºC. If its volume remains constant. Calculate its pressure at 247ºC.
A
25Nm-2
B
50Nm-2
C
500Nm-2
D
1000Nm-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(P_2 = \frac{p_1 \times T_2}{T_1} = \frac{500 \times 520}{260}\)
= 1000N\(m^{-2}\)
Source: Myschool Past Questions Archive (Record #33893)