Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 8836–8850 of 29821 verified questions
Sort by:
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Diagram
The diagram above illustrates an electromagnetic wave travelling with speed 3.0 x 108ms-1. Calculate the wave length of the wave
Attached Figure / Diagram
A
0.05m
B
0.15m
C
0.16m
D
0.40m
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 #35765)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current
A
leads the supply voltge by 90o
B
lags behind the supply voltage by 90o
C
leads the supply voltage by 45o
D
is in phase with the supply voltage
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 #35771)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
The energy stored in a simple cell is
A
electrical
B
nuclear
C
thermal
D
chemical
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 #35772)
Physics
WAEC / WASSCE 2014
Magnetism, Electromagnetism & AC Circuits
Solution
Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90^\circ out of phase
A
i and ii only
B
i and iii only
C
i, ii and iii only
D
i, ii, iii and iv
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
conditions for the occurrence of resonance in a series RLC circuit are i) impedance is at minimum ie when inductive and capacitive reactances are equal ii) when current is maximum
Source: Myschool Past Questions Archive (Record #35773)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
An electric motor converts
A
electrical energy to mechanical energy
B
mechanical energy to electrical energy
C
mechanical energy to chemical energy
D
electrical energy to thermal energy
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 #35774)
Physics
WAEC / WASSCE 2014
Electrostatics & Capacitors
Solution
A 15 \(\mu F\) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [\(\pi = 3.142\)]
A
16\(\Omega\)
B
68\(\Omega\)
C
106\(\Omega\)
D
212\(\Omega\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(X_c = \frac{1}{2 \pi fc}\)
= 2 x 3.142 x 50 x 15 x 10-6
= 212.179\(\Omega\)
Source: Myschool Past Questions Archive (Record #35775)
Physics
WAEC / WASSCE 2014
Atomic, Quantum, Nuclear Physics & Electronics
The energy required to separate the nucleus in an atom completely is known as
A
mass defect of the atom
B
electron binding energy
C
excitation energy
D
nuclear binding energy
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 #35781)
Physics
WAEC / WASSCE 2014
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following statements is the major advantage of nuclear fusion over nuclear fission?
A
nuclear fusion releases more energy
B
more neutrons are released in fusion than in fission
C
fussion does not release as much dangerous radiation as fission
D
fusion reactions occur more readily than fission
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 #35782)
Physics
WAEC / WASSCE 2014
Atomic, Quantum, Nuclear Physics & Electronics
An aluminum foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it?
A
alpha and beta particles
B
alpha and gamma particles
C
beta and gamma particles
D
gamma particles only
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 #35783)
Physics
WAEC / WASSCE 2014
Atomic, Quantum, Nuclear Physics & Electronics
An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively
A
P - 4 and Q + 2
B
P - 4 and Q - 2
C
P + 2 and Q + 2
D
P + 2 and Q - 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 #35784)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Solution
Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 \(\pi \varepsilon_o)^{-1}\) = 9 x 109Nm2C-2]
A
21\(\mu C\)
B
3.6\(\mu C\)
C
4.0\(\mu C\)
D
4.4\(\mu C\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\frac{Q^2}{4 \pi \varepsilon_o r^2}\)
I = 9 x 109 x \(\frac{Q^2}{0.2^2}\)
Q = \(\sqrt{\frac{0.04}{9 \times 10^9}}\)
= 2.11 x 10-6
Source: Myschool Past Questions Archive (Record #35776)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Diagram
Solution
In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit ``
Attached Figure / Diagram
A
1.8A
B
1.0A
C
0.8A
D
0.3A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{1}{r} = \frac{1}{r_1} + \frac{1}{r_2}\)
= \(\frac{1}{5} + \frac{1}{20}\)
= \(\frac{4 + 1}{20} = \frac{5}{20}\)
r = \(\frac{20}{5}\)
= 4\(\Omega\)
R = R1 + R2
= 5 + 4
= 9\(\Omega\)
but V = IR
I = \(\frac{V}{R} = \frac{9}{9}\)
= 1A
Source: Myschool Past Questions Archive (Record #35777)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Solution
A wire of length 100 cm has a resistance of 10\(\Omega\). If its cross-sectional area is 0.005cm2, determine its resistivity
A
0.0005\(\Omega\)cm
B
0.0015\(\Omega\)cm
C
0.0016\(\Omega\)cm
D
0.0700\(\Omega\)cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
e = \(\frac{RA}{L} = \frac{10 \times 0.005}{100} = 0.0005\)
Source: Myschool Past Questions Archive (Record #35778)
Physics
WAEC / WASSCE 2014
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary col. If the input voltage is 150 volts. Calculate the magnitude of the output voltage
A
150V
B
55V
C
36V
D
15V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\frac{ES}{EP} = \frac{Ns}{Np} = \frac{Es}{150} = \frac{40}{400}\)
Es = \(\frac{150 \times 40}{400}\)
= 15V
Source: Myschool Past Questions Archive (Record #35779)
Physics
WAEC / WASSCE 2014
Current Electricity & Electric Circuits
Diagram
The circuit above illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will
Attached Figure / Diagram
A
increase sharply
B
decrease slightly
C
remains the same
D
increase gradually
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 #35780)