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Physics
WAEC / WASSCE 2005
Electricity and Magnetism
The ability of a material to store an electric charge when its plates are at different potentials is referred to as its
A
conductance
B
inductance
C
capacitance
D
resistance
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 #34526)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Solution
Two capacitors if capacitance 0.4\(\mu F\) and 0.5\(\mu F\) are connected in parallel and charged to a p.d. of 50V, Determine the total charge acquired
A
45\(\mu C\)
B
25\(\mu C\)
C
20\(\mu C\)
D
10\(\mu C\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
C = \(C_1 + C_2\) = 0.4 + 0.5 = 0.9\(\mu F\)
Q = Cv = 0.9 x 50 = 45\(\mu C\)
Source: Myschool Past Questions Archive (Record #34527)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Solution
A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor
A
1.2C
B
3.3C
C
3330.0C
D
12.0000.0C
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Q = CV
= 600 x 10-6 x 200 = 1.2C
Source: Myschool Past Questions Archive (Record #34528)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Solution
a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of resistance 3\(\Omega\). Calculate the efficiency of the cell
A
75%
B
50%
C
33%
D
25%
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
R = \(r_1 + R = 1 + 3 = 4\Omega\)
\(\frac{3}{4} \times \frac{100}{1} = 75\)%
Source: Myschool Past Questions Archive (Record #34530)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Solution
An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?
A
N7.20
B
N18.00
C
180.00
D
N720.00
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Cost = \(\frac{Pt}{1000}\) x cost per kWh
= \(\frac{40 \times 72}{1000} \times 2.50 = N7.20\)
Source: Myschool Past Questions Archive (Record #34532)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Solution
A constantan wire has a cross sectional area of 4 x 10-8m2 and a resistivity of 1.1 x 10-6\(\Omega\)m. If a resistor of resistance 11\(\Omega\) is to be made from this wire, calculate the length of the wire required
A
0.4m
B
0.8m
C
2.5m
D
5.0m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
L = \(\frac{RA}{e} = \frac{11 \times 4 \times 10^{-8}}{1.1 \times 10{-4}} = 0.4m\)
Source: Myschool Past Questions Archive (Record #34544)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Lenz's law of electromagnetic induction states that
A
a force is exerted on a current-carrying conductor in a magnetic field
B
electromotive force id induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
C
the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of flux linking the circuit
D
the induced current in a coil is in such a direction that it sets up a magnetic field which opposes the change producing it
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 #34564)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when
A
the magnet is moved away from the stationary solenoid
B
the solenoid is moved away from the stationary magnet
C
the magnet is moved towards the stationary solenoid
D
there is no relative motion between the magnet and the solenoid
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 #34567)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
an electric motor is a machine that converts
A
mechanical energy into electrical energy
B
electrical energy into mechanical energy
C
high voltage to low voltage
D
low voltage to high voltage
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 #34571)
Physics
WAEC / WASSCE 2005
Electricity and Magnetism
Which of the following statements is not a reason for using soft iron in making the core of a transformer? It
A
retains its magnetism for a long time
B
is easily magnitised
C
reduces energy loss due to hysteresis
D
is easily demagnetised
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 #34583)
Physics
NECO SSCE 2005
Electricity and Magnetism
The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the
A
angle of declination
B
angle of depression
C
angle of dip.
D
latitude of the place
E
longitude of the place
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 #42996)
Physics
NECO SSCE 2005
Electricity and Magnetism
A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.
A
30.00
B
4.80
C
3.00
D
0.30
E
0.03
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 #43003)
Physics
NECO SSCE 2005
Electricity and Magnetism
Solution
Which of the following is a desirable property of a fuse Wire?
A
High expansively
B
High thermal conductivity
C
Low density
D
Low electrical resistivity
E
Low melting point
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
A fuse wire should have a low melting point so that it can melt and break the circuit quickly in case of an overload, preventing damage to the electrical system.
Source: Myschool Past Questions Archive (Record #43005)
Physics
NECO SSCE 2005
Electricity and Magnetism
Solution
A voltage of 240V is connected to the primary coil of a transformer, the rating of the primary turns to the secondary turns if the voltage available at the secondary coil is 15V
A
0.06
B
0.9
C
1.6
D
16
E
36
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(E_p\) = 240V, \(E_s\) = 15V
\(\frac{E_p}{E_s} = \frac{ N_p}{N_s}\)
\(\frac{240}{15} = \frac{ N_p}{N_s}\)
∴ \(\frac{ N_p}{N_s}\) = 16.
Source: Myschool Past Questions Archive (Record #43009)
Physics
NECO SSCE 2005
Electricity and Magnetism
Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.
A
70.7V
B
110.0V
C
155.6V
D
311.1V
E
440.0V
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 #43016)