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Physics
WAEC / WASSCE 2005
Work, Energy, Power & Simple Machines
The pressure exerted by a given mass of gas in a container
A
decreases if the container is heated
B
increases if the molecules of the gas move faster
C
increases if the container is doubled
D
decreases as the kinetic energy of the gas molecules inceases
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 #34485)
Physics
WAEC / WASSCE 2005
Waves, Sound & Vibrations
Which of the following statements about a progressive mechanical wave is correct?
A
it can be a plane polarised
B
its energy is localised at specific points of its profile
C
it does not require a material medium for its propagation
D
its frequency remains constant as it travels between different media
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 #34488)
Physics
WAEC / WASSCE 2005
Waves, Sound & Vibrations
Solution
The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period
A
4.00s
B
2.50s
C
0.25s
D
0.04s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = \(\frac{v}{\lambda} = \frac{0.2}{5 \times 10^{-2}} = 4Hz\)
T = \(\frac{1}{f} = \frac{1}{4} = 0.25s\)
Source: Myschool Past Questions Archive (Record #34516)
Physics
WAEC / WASSCE 2005
Reflection, Refraction & Dispersion of Light
Solution
Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water
A
4.33 x 108ms-1
B
4.00 x 108ms-1
C
2.25 x 108ms-1
D
1.33 x 108ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}}\)
\(\frac{4}{3} = \frac{3 \times 10^8}{x}\)
x = \(\frac{9 \times 10^4}{4}\)
= 2.25 x 108m/s
Source: Myschool Past Questions Archive (Record #34517)
Physics
WAEC / WASSCE 2005
Waves, Sound & Vibrations
The amplitude of a wave is the
A
distance travelled by the wave in a complete cycle of its motion
B
maximum diplacement of the wave particle from the equilibrum position
C
separation of two adjacent particles vibrating in a phase
D
distance between two successive troughs of the wave
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 #34518)
Physics
WAEC / WASSCE 2005
Reflection, Refraction & Dispersion of Light
Which of the following optical instruments does not depend on the use of plane mirrors?
A
kaleidoscope
B
simple microscope
C
sextant
D
simple periscope
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 #34522)
Physics
WAEC / WASSCE 2005
Current Electricity & Electric Circuits
A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30o, determine the initial and final angles of reflection respectively
A
0o and 60o
B
90o and 30o
C
0o and 30o
D
90o and 60o
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 #34524)
Physics
WAEC / WASSCE 2005
Current Electricity & Electric Circuits
In which of the following media is the transmission of sound wave fastest?
A
Vacuum
B
Air
C
Wood
D
Iron
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 #34525)
Physics
WAEC / WASSCE 2005
Magnetism, Electromagnetism & AC Circuits
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
Electrostatics & Capacitors
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
Electrostatics & Capacitors
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
Work, Energy, Power & Simple Machines
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
Current Electricity & Electric Circuits
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
Current Electricity & Electric Circuits
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
Current Electricity & Electric Circuits
Solution
The mass and weight of a body on earth are 8kg and 80N respectively. Determine the mass and weight of the body respectively on a planet where the pull of gravity is \(\frac{1}{8}\) that on earth
A
8kg, 8N
B
1kg, 10N
C
64kg, 10N
D
8kg, 10N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
m = 8kg, wt = 80 x \(\frac{1}{8}\) = 10N
Source: Myschool Past Questions Archive (Record #34559)