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Physics
WAEC / WASSCE 1999
Work, Energy, Power & Simple Machines
Palm oil from a bottle flows out more easily after it as been heated because the
A
molecules are given potential energy during the heating
B
friction between oil layers is reduced
C
oil molecules force each other out
D
adhesion between the oil molecules and those of the bottle is increased
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 #25469)
Physics
WAEC / WASSCE 1999
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
A body weighing 100N moves with a speed of 5ms-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms-2)
A
10N
B
50N
C
75N
D
100N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
W = 100N, r = 5m, v = 5m/s and g = 10m/s2
BUT \(F_c\) = \(\frac{M \times V^2}{r}\)
W = mg = m = 100/10 = 10kg
\(F_c\) = \(\frac{10\times 5^2}{5}\) = 50N
Source: Myschool Past Questions Archive (Record #25470)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
A motorcyclist, passing a road junction, moves due west for 8 s at a uniform speed of 5ms-1. He then moves due north for another 6 s with the same speed. At the end of the 6s his displacement from the road junction is 50m in the direction of
A
N53oE
B
N37oE
C
N53oW
D
N37oW
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 #25471)
Physics
WAEC / WASSCE 1999
Newton's Laws, Momentum & Collisions
The time rate of change of displacement is known as
A
speed
B
velocity
C
impulse
D
acceleration
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 #25472)
Physics
WAEC / WASSCE 1999
Temperature, Thermometry & Thermal Expansion
The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is 90o. This thermometer reads 60o when the true temperature is 40oC Calculate the value of X.
A
60o
B
48o
C
40o
D
30o
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 #25478)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
Iron at 30oC feels colder to the hand than wood at 28oC because
A
their linear expansivities are not equal.
B
the temperature of the iron is higher than that of the wood
C
iron is a better radiator of heat than wood
D
iron conducts heat more quickly from the hand than wood
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 #25479)
Physics
WAEC / WASSCE 1999
Temperature, Thermometry & Thermal Expansion
An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)
A
50.006m
B
50.060m
C
51.600m
D
51.200m
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 #25480)
Physics
WAEC / WASSCE 1999
Calorimetry, Latent Heat & Change of State
The heat capacity of a substance is the energy
A
required to raise the temperature of a unit mass of the substance by one degree.
B
required to raise the temperature of the substance by one degree
C
absorbed by the substance at constant temperature
D
lost by a unit mass of the substance.
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 #25481)
Physics
WAEC / WASSCE 1999
Calorimetry, Latent Heat & Change of State
The temperature of a piece of metal of mass 9 g is raised from 10oC to 110oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg-1K-1
A
1.2
B
12.0
C
120.0
D
1200.0
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 #25482)
Physics
WAEC / WASSCE 1999
Linear Motion, Projectiles & Kinematics
A stone of mass 0.7kg is projected vertically , upwards with a speed of 5ms-1. Calculate the maximum height reached. (Take g as 10ms-2 and neglect air resistance)
A
1.00m
B
1.25m
C
1.50m
D
3.75m
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 #25473)
Physics
WAEC / WASSCE 1999
Newton's Laws, Momentum & Collisions
Solution
If the force of attraction between the sun and the 1 planets is removed; the planets will
A
fall towards the sun
B
scatter and stop moving
C
continue to move at tangent to their original orbits
D
continue to move perpendicular to their original orbits. '
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
According to Newton's First Law, an object moves in a straight line unless a force acts on it. The Sun's gravity provides the centripetal force that keeps planets orbiting. If this force disappears, the planet will leave its orbit and move in a straight line tangent to that point.
Source: Myschool Past Questions Archive (Record #25474)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
Diagram
A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram above. Calculate the value of the tension, T. (g = 10ms-2)
Attached Figure / Diagram
A
300.0N
B
173.2N
C
30.0N
D
17.3N
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 #25475)
Physics
WAEC / WASSCE 1999
Waves, Sound & Vibrations
Solution
A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.
A
2.00s
B
0.83s
C
0.08s
D
0.60s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given:
- Frequency \( f = 12 \, \text{Hz} \)
The period \( T \) is the reciprocal of the frequency:
\(T = \frac{1}{f}\)
Substituting the given frequency:
\(T = \frac{1}{12 \, \text{Hz}} \approx 0.0833 \, \text{s}\)
Thus, the period of the motion is approximately:
\(T \approx 0.08 \, \text{s}\).
Source: Myschool Past Questions Archive (Record #25476)
Physics
WAEC / WASSCE 1999
Current Electricity & Electric Circuits
A trolley of mass 4kg moving on a smooth horizontal platform with a speed of 1.0ms-1 collides perfectly with a stationary trolley of the same mass on the same platform. Calculate the total momentum of the two trolleys immediately after the collision.
A
0.5Ns
B
1.0Ns
C
4.0Ns
D
8.0Ns
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 #25477)
Physics
WAEC / WASSCE 1999
Gas Laws & Heat Transfer
Which of the following statements is not correct?
A
A sea breeze is due to convection in air
B
Cotton materials are better than woollen ones for use in hot weather
C
Convectional currents play an important role in the cooling of the engine of a motor car
D
The vacuum space in a flask helps to reduce heat loss by radiation.
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 #25483)