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Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
The average speed of an object is determined by dividing the sum of its initial and final speeds by two only when the acceleration is
A
changing
B
uniform
C
increasing
D
decreasing
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 #35272)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Solution
a body is projected horizonatlly from the top of a cliff 45m above the ground. if the body lands at a distance 30m from the foot of the cliff, calculate the speed of projection. [g = 10ms-2]
A
10ms-1
B
15ms-1
C
20ms-1
D
30ms-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
from, H = \(\frac{1}{2}\)gt\(^2\)
45 = \(\frac{1}{2}\) x 10 x t\(^2\)
45 = 0.5 x 10 t\(^2\)
45 = 5t\(^2\)
t\(^2\) = \(\frac{45}{5}\) = 9
t = \(\sqrt{9}\) = 3s
But distance = velocity x time
V = \(\frac{D}{t}\) = \(\frac{30}{3}\) = 10m/s
Source: Myschool Past Questions Archive (Record #35273)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Which of the following statements best describes a rigid body? A body which
A
is not equally deformed
B
when deformed regains it shape
C
is brittle
D
when deformed remains deformed
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 #35274)
Physics
WAEC / WASSCE 2010
Waves, Sound & Vibrations
Solution
simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed in ms-1 at the centre of the oscillation
A
125\(\pi\)
B
25.00\(\pi\)
C
100.00 \(\pi\)
D
400.00\(\pi\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = WX = \(\frac{2\pi \times 0.25}{0.02} = 25\pi\)
Source: Myschool Past Questions Archive (Record #35282)
Physics
WAEC / WASSCE 2010
Work, Energy, Power & Simple Machines
Solution
A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct? i. The potential energy of the mass is a minimum at the middle of the swing ii. Its kinetic energy is a maximum at the middle of the swing iii. The sum of the potential and kinetic energies is constant throughout the swing
A
i,ii and iii
B
i and ii only
C
ii and iii only
D
i and iii only
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Potential energy is minimum at the middle of the swing, where the mass is at its lowest point, Kinetic energy is maximum at the middle of the swing due to the highest speed. Lastly, the total mechanical energy remains constant throughout the swing, as energy converts between potential and kinetic forms.
Source: Myschool Past Questions Archive (Record #35285)
Physics
WAEC / WASSCE 2010
Linear Motion, Projectiles & Kinematics
Solution
A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms-2. Calculate the magnitude of the retardating force
A
1.25N
B
8.00N
C
45.00N
D
500.00N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = MG
= 25 x 20 = 500N
Source: Myschool Past Questions Archive (Record #35286)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Solution
Which of the following sources of energy is/are exhausible? i. Solar ii. Fossil fuels iii. Tidal power
A
ii, and iii
B
i and ii only
C
i and iii only
D
ii only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Exhaustible energy sources are those that are finite and will eventually run out. Fossil fuels, such as coal, oil, and natural gas, are examples of exhaustible energy sources because they take millions of years to form. On the other hand, solar energy and tidal power are renewable energy sources because they are replenished naturally and regularly. Therefore, only statement II is correct.
Source: Myschool Past Questions Archive (Record #35290)
Physics
WAEC / WASSCE 2010
Work, Energy, Power & Simple Machines
a machine is said to be a third class lever when the
A
load is between the fulcrum and effort
B
fulcrum is between the effort and the load
C
effort is between the fulcrum and load
D
fulcrum is directly below the load
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 #35293)
Physics
WAEC / WASSCE 2010
Temperature, Thermometry & Thermal Expansion
Solution
a thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is
A
-25oC
B
-20oC
C
20oC
D
25oC
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{440 - 380}{680 - 380} = \frac{0 - x}{100 - x}\)
= -25oC
Source: Myschool Past Questions Archive (Record #35295)
Physics
WAEC / WASSCE 2010
Temperature, Thermometry & Thermal Expansion
The advantages of the thermoelectric thermometer include the following characteristics except that it
A
can measure rapidly changing temperatures
B
can measure high and low temperature
C
can measure high and low temperature almost at a point
D
is fairly sensitive
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 #35298)
Physics
WAEC / WASSCE 2010
Gas Laws & Heat Transfer
Solution
In a thermos flask, heat loss by radiation is minimizes by the
A
silvered surfaces
B
vacuum within the doubled walls
C
plastic stopper
D
cork support
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The silvered wall prevents heat loss by radiation. Silver is a poor radiator, and any heat from one wall tends to be reflected back by the other.
Source: Myschool Past Questions Archive (Record #35299)
Physics
WAEC / WASSCE 2010
Gas Laws & Heat Transfer
The pressure P, volume V, and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the followng equations is correct about the gas?
A
PV = \(\frac{constant}{T}\)
B
\(\frac{P}{T} = Constant\)
C
\(\frac{P}{V} = \frac{constant}{T}\)
D
\(\frac{I}{T} = \frac{constant}{PV}\)
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 #35300)
Physics
WAEC / WASSCE 2010
Calorimetry, Latent Heat & Change of State
Solution
Specific heat capacity 36.4 Jkg-1 K-1 of a body means that when 36.4J of heat energy is supplied to a body of
A
mass 100kg the temperature rises by 1k
B
mass 1kg, the temperature by 1000K
C
mass 1kg, the temperature rises by 1K
D
mass 100kg, the temperature rises by 1000k
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The specific heat capacity of a body is the heat energy required to raise a body of mass 1kg through a temperature of 1K.
Source: Myschool Past Questions Archive (Record #35301)
Physics
WAEC / WASSCE 2010
Calorimetry, Latent Heat & Change of State
Solution
An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg-1K-1]
A
100oC
B
75oC
C
50oC
D
45oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\theta = \frac{Pt}{MC} = \frac{400 \times 20}{0.4 \times 400} = 50^o\)
Source: Myschool Past Questions Archive (Record #35317)
Physics
WAEC / WASSCE 2010
Calorimetry, Latent Heat & Change of State
Solution
A solid of mass 0.5kg initially at 50oC melts at 60oC. Calculate the quantity of heat required to melt it completely. [specific heat capacity of the solid =2.0KJ kg-1K-1][Specific latent heat of fusion of solid =1.0 KJ kg-1]
A
1500J
B
10000J
C
10500J
D
15000J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Q = ML + C\(\theta\)
= 0.5 x 1000 + 0.5 x 2000 x 10
= 10500
Source: Myschool Past Questions Archive (Record #35318)