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Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Which of the following factors can affect the speed of sound in air? i. The temperature of the surrounding ii. The direction of the wind iii. The pitch of the sound.
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
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 #34935)
Physics
WAEC / WASSCE 2007
Waves, Sound & Vibrations
Solution
A sounding tuning fork is brought near the open end of a pipe containing air and the loudness of the sound is observed to increase. This observation is due to
A
an echo
B
resonance
C
interference
D
reverbration
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
When the frequency of the tuning fork matches the natural frequency of the air column in the pipe, resonance occurs. This causes the air in the pipe to vibrate more vigorously, amplifying the sound and increasing its loudness.
Source: Myschool Past Questions Archive (Record #34938)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Which of the following statements about sound wave is not correct? Sound waves can be
A
reflected
B
refracted
C
diffracted
D
polarized
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 #34940)
Physics
WAEC / WASSCE 2007
Gas Laws & Heat Transfer
A dry plastic comb used in combing hair was found to attract pieces of paper and dust. The most probable explanation for this phenomenon is that the comb has been given
A
magnetization by induction
B
electric charges by induction
C
electric charges by conduction
D
electric charges by friction
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 #34942)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Solution
Which of the following statements is correct about resonance? Resonance occurs when a body
A
vibrates with its natural frequency
B
is forced to vibrate on its own natural frequency by another body at the same vibration
C
vibrates at the frquency of the body causing the vibration
D
vibrates with an irregular frequency
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Resonance occurs when a body is forced to vibrate at its own natural frequency by another body vibrating at the same frequency.
Source: Myschool Past Questions Archive (Record #34943)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
If a gas is excited by high voltage to produce a discharge and the light is examined in a spectrometer
A
an explosion is observed
B
the rainbow colours are seen
C
an emission spectrum is observed
D
dark lines are observed
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 #34950)
Physics
WAEC / WASSCE 2007
Atomic, Quantum, Nuclear Physics & Electronics
The number of protons in an element increased by one after a radioactive decay. The element must have decay by emitting
A
a beta particle
B
an alpha particle
C
a gamma ray
D
a neutron
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 #34951)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
In a nuclear reactor, chain reactions result from the release of
A
electrons
B
photons
C
neutrons
D
protons
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 #34952)
Physics
WAEC / WASSCE 2007
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons
A
iv, iii, ii, i
B
ii, iv, iii, i
C
iv, ii, iii, i
D
iii, iv, ii, i
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
X–rays are a stream of particles that are emitted when fast accelerating or moving electrons collide with a tungsten target. X-rays are produced when electrons produced by thermionic emission are accelerated through high voltage and are focused onto a tungsten target. The accelerated electrons strike the tungsten target, transform into heat, and emit radiation called x-rays. So the correct sequence of energy transformation in the operation of an X-ray tube is Option C.
Source: Myschool Past Questions Archive (Record #34953)
Physics
WAEC / WASSCE 2007
Atomic, Quantum, Nuclear Physics & Electronics
There is always an uncertainty involved in any attempt to measure the position and momentum of an electron simultaneously. This statement is known as the
A
de Broglie's law
B
Heisenberg uncertainty principle
C
Franck-Hertz experimental law
D
wave-particle paradox
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 #34954)
Physics
WAEC / WASSCE 2007
Magnetism, Electromagnetism & AC Circuits
Which of the following components is used for storing electric charges?
A
inductor
B
resistor
C
capacitor
D
electrometer
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 #34944)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Which of the following operations does not represent an action of a force field?
A
falling of a mango fruit from the tree
B
picking of nails using a bar magnet
C
repulsion of two like charges
D
pushing of a wheel-barrow on a level gound
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 #34945)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Solution
A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated
A
320J
B
400J
C
10800J
D
72000J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
W = P x t
= 40 x 30 x 60
= 72000J
Source: Myschool Past Questions Archive (Record #34946)
Physics
WAEC / WASSCE 2007
Current Electricity & Electric Circuits
Solution
Five 80-W and three 100W are run for 8 hours. If the cost of energy is N5.00 per unit, calculate the cost of running the lamp. [1 unit = 1 kWh]
A
N280.00
B
N28.00
C
N7.20
D
N1.44
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = (80 x 5 + 100 x 3)8
= 5600W
Cost = \(\frac{5600}{1000} \times 5 = N28\)
Source: Myschool Past Questions Archive (Record #34948)
Physics
WAEC / WASSCE 2007
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following electromagnetic wave can be detected by its heating effect?
A
ultraviolet radiation
B
x-rays
C
gamma rays
D
infrared 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 #34949)