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Physics
WAEC / WASSCE 2014
Magnetism, Electromagnetism & AC Circuits
A device that converts mechanical energy into electrical energy is
A
a dynamo
B
an electric motor
C
an induction coil
D
a transformer
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 #35749)
Physics
WAEC / WASSCE 2014
Units, Measurements & Dimensional Analysis
The S.I unit of power is
A
N
B
Pa
C
W
D
J
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 #35750)
Physics
WAEC / WASSCE 2014
Work, Energy, Power & Simple Machines
A body of mass M kg rests on a plane inclined at an angle \(\theta\) to the horizontal. The component of the weight of the body parallel to the plane is
A
Mg sin \(\theta\)
B
Mg cos \(\theta\)
C
Mg tan \(\theta\)
D
Mg sec \(\theta\)
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 #35756)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Solution
A quantity of water at 20oC is mixed with another quantity of water at 70oC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water
A
7:2
B
3:2
C
2:5
D
1:2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Q = MC\(\theta\)
M = \(\frac{Q}{C\theta}\)
\(\frac{Q}{20C}\) : \(\frac{Q}{30C}\)
= 3:2
Source: Myschool Past Questions Archive (Record #35757)
Physics
WAEC / WASSCE 2014
Work, Energy, Power & Simple Machines
Solution
A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]
A
0.23hp
B
0.40hp
C
4.00hp
D
4.40hp
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = FV = \(\frac{100 \times 30}{1000} = 3 kW\)
\(\frac{3}{0.75} = 4hp\)
Source: Myschool Past Questions Archive (Record #35759)
Physics
WAEC / WASSCE 2014
Waves, Sound & Vibrations
The quality of a note depends on its
A
frequency
B
pitch
C
overtones
D
amplitude
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 #35760)
Physics
WAEC / WASSCE 2014
Reflection, Refraction & Dispersion of Light
Solution
A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish
A
2.50m
B
1.95m
C
1.50m
D
0.45m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Real depth = n x apparent depth
= 1.3 x 1.5 = 1.95m
Apparent displacement = 1.95 - 1.5 = 0.45m
Source: Myschool Past Questions Archive (Record #35766)
Physics
WAEC / WASSCE 2014
Waves, Sound & Vibrations
Solution
an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]
A
104.4m
B
207.9m
C
415.8m
D
523.8m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
S = \(\frac{vt}{2} = \frac{330 \times 1.26}{2} = 207.9\)
Source: Myschool Past Questions Archive (Record #35767)
Physics
WAEC / WASSCE 2014
Reflection, Refraction & Dispersion of Light
Solution
An object is placed in front of two plane mirrors inclined at 60o to each other. Determine the number of the images formed
A
2
B
3
C
5
D
7
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{360}{\theta}\) - 1
= \(\frac{360}{60} -1\)
= 6 - 1 = 5
Source: Myschool Past Questions Archive (Record #35768)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
An ammeter can be adapted to measure potential difference by using a
A
shunt
B
multiplier
C
rheostat
D
resistance box
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 #35769)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
The region around a magnet in which magnetic force can be expressed is known as
A
declination
B
flux density
C
field
D
flux
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 #35770)
Physics
WAEC / WASSCE 2014
Waves, Sound & Vibrations
A transverse wave can be distinguished from a longitudinal wave by
A
diffraction
B
relection
C
refraction
D
polarization
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 #35761)
Physics
WAEC / WASSCE 2014
Reflection, Refraction & Dispersion of Light
Solution
Refraction of lights differs from reflection in that, in refraction i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. Which of the statements above is/are correct?
A
i only
B
i ad ii only
C
ii and iii only
D
i and iii only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
At least two media are involved: True for refraction.
There is a change in the direction of the ray: True for both refraction and reflection.
The speed of the ray changes: True only for refraction.
Source: Myschool Past Questions Archive (Record #35762)
Physics
WAEC / WASSCE 2014
Lenses & Optical Instruments
Which of the following relations about the focal length fo of the objective and focal length fe of the eye piece of a compound is correct?
A
fo = fe
B
fo e
C
fo > fe
D
fe = 2fo
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 #35763)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
The functional difference between a lens and a mirror is that a lens
A
reflects a beam of light while a mirror refracts it
B
refracts a beam of light while a mirror reflects it
C
absorbs incident rays while a mirror transmit them
D
transmits incidents ray whle a mirror absorbs them
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 #35764)