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Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
A ball bearing is projected vertically upwards from the ground with a velocity of 15ms-1. Calculate the time taken by the ball to return to the ground [g = 10ms-1]
A
1.5s
B
3.0s
C
5.0s
D
7.5s
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
t = 2\(\frac{(v - u)}{g} = 2\frac{(0 - 15)}{-10}\)
\(\frac{2 \times 15}{10}\) = 3.0s
Source: Myschool Past Questions Archive (Record #34284)
Physics
WAEC / WASSCE 2004
Calorimetry, Latent Heat & Change of State
Solution
When compared with water, mercury is preferred as a thermometric liquid because
A
has a higher density
B
has lower specific heat capacity
C
exhibits anomalous thermal expansion
D
contains molecules which have very strong adhesive forces
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Specific Heat Capacity of mercury and water are 0.14 Jg\(^{-1}\)C\(^{-1}\) and 4.186Jg\(^{-1}\)C\(^{-1}\) respectively.
Source: Myschool Past Questions Archive (Record #34286)
Physics
WAEC / WASSCE 2004
Temperature, Thermometry & Thermal Expansion
Which of the following values on the absolute scale of temperature is the ice point?
A
0K
B
32K
C
100K
D
273k
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 #34287)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the
A
is better conductor of heat than the foot
B
mat loses heat to the bare foot at a faster rate
C
mat is better conductor of heat than the floor
D
concrete floor is a better conductor of heat than the mat
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 #34319)
Physics
WAEC / WASSCE 2004
Atomic, Quantum, Nuclear Physics & Electronics
Solution
When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume
A
1.0000cm3
B
1.0020cm3
C
1.0036cm3
D
1.0180cm3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\gamma\) = \(\frac{\delta\ V}{V_1\delta\theta}\)
but \(\gamma\) = 3\(\alpha\) and \(\delta\)V = \(V_2 - V_1\),
making \(V_1\) subject of formula we have
\(V_1 = \frac{V_2}{3\alpha\delta\theta + 1} = \frac{1.0018}{3 \times 2.0 \times 10^{-5} \times 30 + 1}\)
= 1\(cm^3\)
\(\therefore\) the original volume of the metal ball = 1.0000\(cm^3\)
Source: Myschool Past Questions Archive (Record #34320)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg
A
79.4cm Hg
B
74.38cm Hg
C
74.2cm Hg
D
69.4cm Hg
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
At 77cm Hg, A.P = \(\frac{75.0 \times 72.0}{72.6} = 74.38\)
Source: Myschool Past Questions Archive (Record #34325)
Physics
WAEC / WASSCE 2004
Gas Laws & Heat Transfer
On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes
A
a incease in the number of gas molecules
B
a decrease in the density of the gass
C
an increase in the average speed of the gas molecules
D
a decrease in pressure exerted by the gas
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 #34331)
Physics
WAEC / WASSCE 2004
Gas Laws & Heat Transfer
Solution
The temperature of 900cm3 of an ideal gas at a pressure of 114cm Hg is 27oC. Calculate its volume at 76cm Hg and 0oC
A
50.0cm3
B
546.0cm3
C
659.3cm3
D
1228.5cm3
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(V_2 = \frac{P_1V_1T_2}{T_1P_2} = \frac{114 \times 900 \times 273}{300 \times 76}\)
= 1228.5cm3
Source: Myschool Past Questions Archive (Record #34332)
Physics
WAEC / WASSCE 2004
Waves, Sound & Vibrations
The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the
A
amplitude of the wave
B
wavelength of the wave
C
direction of vibration of the particles of the medium
D
period of vibration of the particle of the medium
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 #34334)
Physics
WAEC / WASSCE 2004
Waves, Sound & Vibrations
A wave travelling from water to glass suffers a change in its speed at the common boundary. Which of the following properties explains this observation?
A
dispersion
B
refraction
C
interference
D
diffraction
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 #34342)
Physics
WAEC / WASSCE 2004
Reflection, Refraction & Dispersion of Light
The image of an optical pin placed at the principal focus of a concave mirror will be formed
A
between the principal focus and the pole
B
at the centre of the curvature
C
between the principal focus and the centre of curvature
D
at infinity
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 #34343)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera
A
0.18m
B
0.50m
C
1.62m
D
18.00m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
hi = \(\frac{ho \times v}{u} = \frac{1.8 \times 0.3}{3} = 0.18m\)
Source: Myschool Past Questions Archive (Record #34346)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
During a thunderstorm, lightning and thunder occurred simultaneously in the atmosphere. An observer on the earth surface's sees the lightning flash shortly before hearing the thunder. This is because the
A
atmospheric pressure is higher at the surface than at the higher altitudes
B
speed of sound is less than that of light
C
temperature of the atmosphere decreases with altitude
D
atmospheric density decreases with altitude
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 #34355)
Physics
WAEC / WASSCE 2004
Lenses & Optical Instruments
A magnified and virtual image of a near object is produced by
A
prism binoculas
B
astronomical telescope
C
periscope
D
simple microscope
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 #34358)
Physics
WAEC / WASSCE 2004
Waves, Sound & Vibrations
Solution
A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms-1, how long would it take for her to hear the echo of the sound?
A
2.062s
B
0.970s
C
0.485s
D
0.242s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
t = \(\frac{2x}{v} = \frac{2 \times 80}{330} = 0.485s\)
Source: Myschool Past Questions Archive (Record #34364)