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Physics
WAEC / WASSCE 1994
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following scientists postulated that moving particles exhibit wave properties?
A
Niels Bohr
B
Ernest Rutherford
C
Werner Heisenberg
D
Louis de Broglie
E
Erwin Schroedinger
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 #26259)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
Solution
A battery of e.m.f 10V an internal resistance 2Ω is connected to a resistance of 6Ω. Calculate the p.d
A
8.75V
B
7.50V
C
5V
D
2.50V
E
1.25V
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = E - Ir = 10V - \(\frac{10 \times 2}{8}\) = 7.5V
Source: Myschool Past Questions Archive (Record #26260)
Physics
WAEC / WASSCE 1994
Magnetism, Electromagnetism & AC Circuits
A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
A
a moving coil ammeter
B
a D.C generator
C
a D.C electric motor
D
An induction coil
E
An A.C generator
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 #26262)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
Solution
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
A
180Ω
B
27Ω
C
3Ω
D
1.3Ω
E
0.8Ω
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
R = \(\frac{V}{I} = \frac{12}{15}\) = 0.8Ω
Source: Myschool Past Questions Archive (Record #26263)
Physics
WAEC / WASSCE 1994
Magnetism, Electromagnetism & AC Circuits
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field of strength B in the direction of the field. The force on the particle is
A
qvB
B
mqvB
C
qvB/m
D
mvB/q
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 #26264)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
Solution
A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
A
1k
B
2k
C
5k
D
10k
E
20k
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
100W X 10h = 1000Wh = 1KWh thus cost is 2k
Source: Myschool Past Questions Archive (Record #26265)
Physics
WAEC / WASSCE 1994
Waves, Sound & Vibrations
Which of the following is a stringed instrument?
A
Flute
B
Trumpet
C
Piano
D
Drum
E
Organ
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 #26266)
Physics
WAEC / WASSCE 1994
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer with 5500 turns in its primary winding is used between a 240V a.c supply and 120V kettle. Calculate the number of turns in the secondary winding
A
11000
B
2750
C
460
D
550
E
232
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{E_s}{E_p} = \frac{N_s}{N_p} ; \frac{120}{240}= \frac{N_s}{5500} thus N_s\)=2750
Source: Myschool Past Questions Archive (Record #26267)
Physics
WAEC / WASSCE 1994
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Beta particles are
A
electrons
B
protons
C
neutrons
D
helium nuclei
E
tritium nuclei
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Beta particles are equivalent to electrons but arise from the radioactive decay of unstable atoms. They are emitted with a continuous range of energies up to a maximum that is characteristic of each radionuclide.
Source: Myschool Past Questions Archive (Record #26268)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
Solution
Which of the following substances is not an insulator?
A
Aluminium
B
Glass
C
Plastic
D
Clay
E
Cork
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
insulators are substances that do not allow an electric current/heat to pass through them e.g. cork, plastic, clay, etc.
Source: Myschool Past Questions Archive (Record #26269)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
When an atom loses or gains a charge, it becomes an
A
ion
B
an electron
C
a neutron
D
a proton
E
a deuteron
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 #26271)
Physics
WAEC / WASSCE 1994
Atomic, Quantum, Nuclear Physics & Electronics
Solution
In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material
A
0.75 days
B
2.58 days
C
4 days
D
4.80 days
E
6 days
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
64g → 32g → 16g → 8g → 4g → 2g
Half life time= 24/5 = 4.8 days
Source: Myschool Past Questions Archive (Record #26272)
Physics
WAEC / WASSCE 1994
Current Electricity & Electric Circuits
Solution
The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?
A
330
B
238
C
146
D
119
E
73
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
238 - 92 = 146
Source: Myschool Past Questions Archive (Record #26273)
Physics
WAEC / WASSCE 1994
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The wave function of a metal is 8.0 x \(10^{-19}\)J. Calculate the wavelength of its threshold frequency. (Speed of light in a vacuum = 3 x \(10^8ms^{-1}, Planck's constant = 6.6 \times 10^{-34}\)Js)
A
0.8 x \(10^{-7}\)m
B
1 x \(10^{-7}\)m
C
2.3 x \(10^{-7}\)m
D
3.8 x \(10^{-7}\)m
E
12.4 x \(10^{-7}\)m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\theta = E - E_f = h_f = \frac{v}{\lambda} \Rightarrow = \lambda = \frac{h_v}{\theta}
\frac{6.6\times 10^{-34} \times 3 \times 10^{8}}{8.6 \times 10^{-19}} = 0.8 \times 10^{-7}\)m
Source: Myschool Past Questions Archive (Record #26274)
Physics
WAEC / WASSCE 1994
Waves, Sound & Vibrations
Solution
A note of frequency of 2000Hz has a velocity of \(400ms^{-1}\). What is the wavelength of the note?
A
800m
B
200m
C
5m
D
2m
E
0.2m
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
\(\lambda = \frac{v}{f} = \frac{400}{2000} = 0.2\)m
Source: Myschool Past Questions Archive (Record #26275)