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Physics
WAEC / WASSCE 2001
Gas Laws & Heat Transfer
Solution
The volume of an ideal gas at a pressure of 77 cmHg and a temperature of 60 ^\circC is 240 cm\(^3\). If the temperature and pressure are increased to 98oC
and 81cmHg respectively, calculate the new volume of the gas
A
411.5cm3
B
267.1cm3
C
254.2cm3
D
112.7cm3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V2 = \(\frac{P_1V_1T_2}{P_2T_1} = \frac{77 \times 240 \times 371}{81 \times 333}\)
= 254.2cm3
Source: Myschool Past Questions Archive (Record #33897)
Physics
WAEC / WASSCE 2001
Calorimetry, Latent Heat & Change of State
Solution
The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as
A
latent heat
B
heat capacity
C
specific latent heat
D
specific heat capacity
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as latent heat.
Source: Myschool Past Questions Archive (Record #33899)
Physics
WAEC / WASSCE 2001
Calorimetry, Latent Heat & Change of State
Solution
Which of the following physical qualities affects the saturated vapour pressure of a liquid ?
A
temperature
B
volume
C
mass
D
density
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The saturated vapor pressure of a liquid is primarily affected by temperature. As the temperature increases, the vapor pressure also increases.
Source: Myschool Past Questions Archive (Record #33901)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
Humidity is used to describe the amount of
A
air in water vapour
B
cloud available in the atmosphere
C
air in equal volume of cloud
D
water vapour in the amosphere
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Humidity is used to describe the amount of water vapor in the atmosphere. So OPTION D is correct.
Source: Myschool Past Questions Archive (Record #33903)
Physics
WAEC / WASSCE 2001
Reflection, Refraction & Dispersion of Light
Solution
Surface waves travelling in deep water at 15ms-1 are incident at a shallow water boundary. If the angles of incidence and refraction are 45o and 30o respectively. Calculate the speed of the waves in shallow water
A
8.1ms-1
B
10.0ms-1
C
10.6ms-1
D
22.5ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\sin 45}{\sin 30} = 1.4142\)
n = \(\frac{15m/s}{x}\)
x = \(\frac{15}{1.4142}\) = 10.6m/s
Source: Myschool Past Questions Archive (Record #33907)
Physics
WAEC / WASSCE 2001
Reflection, Refraction & Dispersion of Light
Solution
An incident ray is reflected normally by a plane mirror onto a screen where it forms a bright spot. The mirror and screen are parallel and 1m apart. If the mirror is rotated through 5º, calculate the displacement of the spot
A
8.7cm
B
10.0cm
C
15.4cm
D
17.6cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From the diagram above,
Tan\(\theta\) = \(\frac{\text{d}}{100}\)
Tan10º = \(\frac{\text{d}}{100}\)
d = 100 x Tan 10º = 100 x 0.1763 ≈ 17.6cm.
Source: Myschool Past Questions Archive (Record #33909)
Physics
WAEC / WASSCE 2001
Reflection, Refraction & Dispersion of Light
Solution
Convex spherical mirrors are preferred to plane mirrors as driving mirrors because
A
the image produce is upright and clearly visible
B
it provides a wider field of view
C
the image produce is errect and diminished
D
the image produced is not laterally inverted
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Convex spherical mirrors are preferred as driving mirrors mainly because they provide a wider field of view.
Source: Myschool Past Questions Archive (Record #33910)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
An object is placed 20cm from a lens. If an image is formed on a screen 260cm away from the lens, calculate the magnification of the image
A
28
B
26
C
24
D
13
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
M = \(\frac{v}{u} = \frac{260}{20} = 13\)
Source: Myschool Past Questions Archive (Record #33911)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
A piece of cloth appears green in sunlight. When held in red light, it will appear
A
green
B
blue
C
red
D
black
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
A piece of cloth that appears green in sunlight reflects green light and absorbs other colors. When held in red light, it will not reflect any red light because it does not contain red pigments to reflect that color.
Source: Myschool Past Questions Archive (Record #33912)
Physics
WAEC / WASSCE 2001
Reflection, Refraction & Dispersion of Light
Solution
Dispersion of white light by a glass prism occurs because
A
white light consist of a mixture of seven different colour
B
the refractive index of glass is different from each constituent colour of white light
C
the speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
D
the speed of each colour of light in the glass is proportional to the angle of refraction in he prism
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Dispersion of white light by a glass prism occurs because the refractive index of glass varies for each color. This difference causes each color to bend at a different angle, resulting in a spectrum of colors.
Source: Myschool Past Questions Archive (Record #33913)
Physics
WAEC / WASSCE 2001
Waves, Sound & Vibrations
Solution
Which of the following statements about sound is correct?
A
when sound travels from air to a denser medium, it is refracted away from the normal at the point of incidence
B
sound travels faster in air than in water
C
the wavelength of sound changes when it travels from to water
D
the frequency of it travels from air to water
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
When sound moves from air (a less dense medium) to water (a denser medium), its speed increases, leading to a change in wavelength while the frequency remains constant.
Source: Myschool Past Questions Archive (Record #33914)
Physics
WAEC / WASSCE 2001
Waves, Sound & Vibrations
Diagram
Solution
The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements is not correct? The wave produced on the wire is
Attached Figure / Diagram
A
stationary and lonitudinal
B
stationary and mechanical
C
mechanical and longitudinal
D
progessive and transverse
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The wave produced on the wire in the sonometer box is:
> Stationary (standing wave)
> Transverse, not longitudinal.
Source: Myschool Past Questions Archive (Record #33917)
Physics
WAEC / WASSCE 2001
Waves, Sound & Vibrations
Diagram
Solution
The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements about the frequency of vibration of the wire is not correct?
Attached Figure / Diagram
A
proportional to the mass per unit length of the wire
B
equal to the frequency of the tuning fork
C
inversely proportional to the length of the wire
D
proportional to the sqare root of the tension
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The frequency of a vibrating stretched string or wire depends on three factors (i) Length of string l, (ii) Tension T, and (iii) Mass per unit length M
F ∝ \(\frac{1}{\text{l}}\)\(\sqrt{\frac{\text{T}}{\text{M}}}\)
From the formula above, the frequency of vibration of the wire is not proportional to the mass per unit length of the wire.
Source: Myschool Past Questions Archive (Record #33920)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in he wire is increased to 196N
A
130.6Hz
B
182.9Hz
C
358.4Hz
D
501.8Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{f}{256} = \sqrt{\frac{196}{100}}\)
f = \(\sqrt{\frac{256^2 \times 196}{100}}\)
= 356.4Hz
Source: Myschool Past Questions Archive (Record #33932)
Physics
WAEC / WASSCE 2001
Current Electricity & Electric Circuits
Solution
An electric bulb is rated 60W, 220V. Calculate the resistance of its filament when it is operating normally
A
296.7\(\Omega\)
B
400.0\(\Omega\)
C
512.2\(\Omega\)
D
806.7\(\Omega\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
R = \(\frac{v^2}{P} = \frac{220^2}{100} = 806.7\Omega\)
Source: Myschool Past Questions Archive (Record #33938)