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Physics WAEC / WASSCE 1993 Calorimetry, Latent Heat & Change of State
A household refrigerator consumes electrical energy at the rate of 200 W. lf electricity costs 5 k per kWh, calculate the cost of operating the appliance for 30 days.
A
N7.20
B
N12.00
C
N30.00
D
N33.33
E
N72.00
medium Difficulty
Physics WAEC / WASSCE 1993 Circular Motion, Gravitation & Simple Harmonic Motion
Calculate the escape velocity of a satellite launched from the earth’s surface (Take g as 10ms-2 and the radius of the earth as 6.4 x 106m)
A
8.00 x 106ms-1
B
1.13 x104ms-1
C
3.58x102ms-1
D
5.59 x10-2ms-1
E
3.95x10-2ms-1
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
What is the gravitational potential due to a point mass m at a distance from it? (G = gravitational constant)
A
-Gm2/r2
B
-Gm2/r
C
–Gm/Gr2
D
–Gm/r
E
–Gm/2
medium Difficulty
Physics WAEC / WASSCE 1993 Magnetism, Electromagnetism & AC Circuits
In a series R - C circuit, the resistance of the resistor is 4 Ω and capacitive reactance is 3 Ω. Calculate the impedance of the circuit
A
1Ω
B
4Ω
C
5Ω
D
7Ω
E
12Ω
medium Difficulty
Physics WAEC / WASSCE 1993 Magnetism, Electromagnetism & AC Circuits
The vector diagram shown below represents the resistance R, the capacitive reactance Xc, the inductive reactance Xc and the impedance, Z in an R-L-C circuit. The current in the circuit will be maximum when
Attached Figure / Diagram
Question diagram
A
XL = XC
B
XL = XL
C
R = XL
D
R = X
medium Difficulty
Physics WAEC / WASSCE 1993 Magnetism, Electromagnetism & AC Circuits
In a purely resistive a.c. circuit, the current I = Io sin wt and voltage, V = Vo sin wt. Calculate the instantaneous power dissipated in the circuit in time t.
A
Io Vo
B
2Io Vosin wt
C
(Io Vo)/2
D
Io Vo sin2wt
E
I2o V2o
medium Difficulty
Physics WAEC / WASSCE 1993 Electrostatics & Capacitors
A point charge of 1.0 x 10-7 C experiences force of 0.01 N in a uniform electric field. Calculate the magnitude of the strength of the field
A
106 Vm-1
B
105 Vm-1
C
10-5 Vm-1
D
102 Vm-1
E
109 Vm-1
medium Difficulty
Physics WAEC / WASSCE 1993 Electrostatics & Capacitors
The potential difference between two points A and B situated at a distance d apart is V. Which of the following expresses the magnitude of the electric field intensity between the two points assuming the field is uniform?
A
Vd
B
dV-1
C
Vd-1
D
V2d
E
d2V
medium Difficulty
Physics WAEC / WASSCE 1993 Atomic, Quantum, Nuclear Physics & Electronics
Which of the following have the greatest penetrating power?
A
Beta rays
B
Alpha rays
C
Gamma rays
D
Electrons
E
Neutrons
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
A particle of charge 5C moves perpendicularly to a magnetic Held of magnitude C.01 T. If the velocity of the charge is 1.5ms'2, calculate the magnitude of the force exerted on the particle
A
0.050 N
B
0.075N
C
0.0300N
D
3.300N
E
0.000N
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
The function of the magnanese (IV) oxide in a leclanche cell is to
A
decrease the e.m.f. of the cell
B
prevent local action in the cell
C
prevent polarization in the cell
D
increase the density of the electrolyte
E
increase the resistance of the cell.
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.
Attached Figure / Diagram
Question diagram
A
7.5A
B
2.5A
C
1.2A
D
0.8A
E
O.4A
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
Electrical resistance is the property of an electrical conductor that causes electrical energy to be converted into
A
mechanical energy
B
solar energy
C
heat energy
D
magnetic energy
E
chemical energy.
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
Calculate the current, I in the diagram shown above. (Neglect the internal resistance of the cell)
Attached Figure / Diagram
Question diagram
A
4.0A
B
2.0A
C
1.0A
D
O.5A
E
0.1A.
medium Difficulty
Physics WAEC / WASSCE 1993 Current Electricity & Electric Circuits
Which of the following is not a conductor of electricity?
A
Human body
B
Glass
C
Silver
D
Earth
E
Copper
medium Difficulty
Page 1554 of 1989