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Physics
WAEC / WASSCE 2011
Magnetism, Electromagnetism & AC Circuits
A wire of length 30cm is moved with a speed of 2ms-1 at right angles to a magnetic field of flux density 0.4T. calculate the emf induced in the wire
A
0.15V
B
0.24V
C
2.70V
D
24.00V
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 #35495)
Physics
WAEC / WASSCE 2011
Waves, Sound & Vibrations
The main difference between echo and reverberation is that
A
reverberation is reflected sound while echo is refracted sound
B
the time interval between incident sound and reflecte sound is shorter for reverbration
C
the amplitude of an echo is greater
D
reverberation is from acoustic speakers while echo comes from clifts
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 #35479)
Physics
WAEC / WASSCE 2011
Circular Motion, Gravitation & Simple Harmonic Motion
The correct relationship between "G" and "g" in a gravitational field is given by the equation (Where the symbols have their usual meanings)
A
g = \(\frac{GM}{R}\)
B
g = \(\frac{GM}{R^2}\)
C
g = \(\frac{GM^2}{R}\)
D
g = \(\frac{GM^2}{R^2}\)
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 #35482)
Physics
WAEC / WASSCE 2011
Electrostatics & Capacitors
The capacitance of a parallel-plate capacitor
A
decreases when the seperation between the plate decreases
B
increases when the optential difference between the plates is increased
C
is greater without a dielectric material between the plates than with a dielectric
D
is greater with a dielectric between the plates than without a dielectric.
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 #35483)
Physics
WAEC / WASSCE 2011
Electrostatics & Capacitors
Solution
When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold
A
collapse slowly
B
vibrate
C
are not affected
D
diverge rapidly
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
This is because the presence of the positively charged electroscope will induce a separation of charges in the uncharged pin, causing it to interact with the charged electroscope.
Source: Myschool Past Questions Archive (Record #35484)
Physics
WAEC / WASSCE 2011
Magnetism, Electromagnetism & AC Circuits
Which of the following practices will lead to losses in electrical power transmission?
A
using transmission cables of large diameter
B
transmitting at high voltage and low current
C
transmitting at relatively low voltage and high current
D
using a set-up transformer at the production end
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 #35496)
Physics
WAEC / WASSCE 2011
Gas Laws & Heat Transfer
For photoelectric emission, the threshold frequency is the
A
maximum frequency of incident radiation that will eject elecrons
B
minimum fraquency of incident radiation required to eject elecrons
C
frequency which results in the emission of the greater number of electrons
D
fraquency whch impacts greatest kinetic energy to emitte electrons
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 #35497)
Physics
WAEC / WASSCE 2011
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following properties is not applicable to X-rays? They
A
travel in straight lines
B
travel with the speed of light
C
are deflected by magnetic field
D
affect photographic films
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 #35498)
Physics
WAEC / WASSCE 2011
Atomic, Quantum, Nuclear Physics & Electronics
Uranium-234 disintegrated to form Thorium-230 by emitting
A
alpha particles
B
gamma rays
C
beta negative rays
D
beta positive rays
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 #35499)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
The change in mass of fuel during a nuclear reaction is 2.0 x 10-27 kg. Calculate the amount of energy released. (Speed of light = 2.0 x 108ms-1)
A
1.8 x 10-10J
B
9.0 x 10-11J
C
6.0 x 10-19J
D
1.2 x 10-45J
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Q = \(\Delta MC^2\)
= 2 x 10-27(3 x 10)2
= 1.8 x 10-10J
Source: Myschool Past Questions Archive (Record #35500)
Physics
WAEC / WASSCE 2011
Atomic, Quantum, Nuclear Physics & Electronics
Nuclear fusion is not used as a source of enegy because
A
very high temperature is needed for the reaction
B
the fuel for the reaction is not easy to obtain
C
less energy is released
D
the reaction is too slow
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 #35501)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Diagram
Solution
Using the circuit diagram above. Calculate the total charge in the circuit
Attached Figure / Diagram
A
80\(\mu C\)
B
35\(\mu C\)
C
20\(\mu C\)
D
16\(\mu C\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
C - \(C_1 + C_2 = 2 + 6 = \mu F\)
\(\frac{1}{C} = \frac{1}{C_1} + \frac{1}{C_1} + \frac{1}{C_2} = \frac{1}{8} + \frac{1}{2}\)
C = \(\frac{8}{5 \mu F}\)
Q = CV
= \(\frac{8}{5} \times 10 = 16\mu C\)
Source: Myschool Past Questions Archive (Record #35503)
Physics
WAEC / WASSCE 2011
Electrostatics & Capacitors
Diagram
Solution
Using the circuit diagram above. Calculate the potential difference across the capacitors in parallel
Attached Figure / Diagram
A
10.0V
B
8.0V
C
6.7V
D
2.0V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
V = \(\frac{Q}{V} = \frac{16}{8} = 2\Gamma\)
Source: Myschool Past Questions Archive (Record #35511)
Physics
UTME / JAMB 2011
Gas Laws & Heat Transfer
Solution
If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys
A
Graham's Law
B
Boyle's Law
C
Pressure law
D
Charles Law
E
No Correct Option
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Rate of diffusion is inversely proportional to the square root of density - Graham's law
\( P \propto \frac{1}{v} \) at constant temperature - Boyle's law
\( P \propto T \) at constant volume - Pressure law
\( P \propto T \) at constant pressure - Charles law
therefore no correct option
Source: Myschool Past Questions Archive (Record #41404)
Physics
UTME / JAMB 2011
Current Electricity & Electric Circuits
Solution
In Homes, electrical appliances and lamps are connected in parallel because
A
Parallel connections do not heat up the wires
B
independence switches can be used
C
less current will be used
D
less voltage will be used
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
if appliances are connected in series, the effective voltage is the sum of individual voltages which will be high.
Source: Myschool Past Questions Archive (Record #41406)