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Physics
WAEC / WASSCE 2010
Calorimetry, Latent Heat & Change of State
Solution
Dew point is not affected by
A
temperature
B
wind
C
the amount of water vapour in the atmosphere
D
atmospheric pressure
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The dew point is primarily influenced by temperature, the amount of water vapor in the atmosphere, and atmospheric pressure, but wind does not directly affect the dew point itself.
Source: Myschool Past Questions Archive (Record #35319)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Solution
A certain wave has a speed of 20ms-1. If the frequency of the wave is 0.25Hz, calculate the distance between successive crests of the wave
A
5.0m
B
40.0m
C
50.0m
D
80.0m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\lambda = \frac{v}{f} = \frac{20}{0.25} = 80\)
Source: Myschool Past Questions Archive (Record #35320)
Physics
WAEC / WASSCE 2010
Waves, Sound & Vibrations
The ability of a wave to spread around corners is called
A
polarisation
B
dispersion
C
diffraction
D
reflection
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 #35321)
Physics
WAEC / WASSCE 2010
Reflection, Refraction & Dispersion of Light
The following devices use plane mirrors in their operations, except
A
periscope
B
sextant
C
kaleidoscope
D
binoculars
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 #35322)
Physics
WAEC / WASSCE 2010
Reflection, Refraction & Dispersion of Light
When an object is placed at the principal focus of a concave mirror, the location of the image formed is
A
between principal focus and pole
B
between principal focus and centre of curvature
C
at infinity
D
at centre of curvature
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 #35323)
Physics
WAEC / WASSCE 2010
Waves, Sound & Vibrations
A ray of light travels from air to water. The refeactive index of water is given by the expression
A
\(\frac{\text{velocity in water}}{\text{velocity in air}}\)
B
\(\frac{\text{sine of angle of refraction}}{\text{sine of angle of incidence}}\)
C
\(\frac{\text{apparent depth}}{\text{real depth }}\)
D
\(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)
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 #35327)
Physics
WAEC / WASSCE 2010
Elasticity, Density, Pressure & Fluids
A lens that is thinner at the middle and thicher at the edges is
A
diverging
B
converging
C
plano-convex
D
converging meniscus
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 #35328)
Physics
WAEC / WASSCE 2010
Waves, Sound & Vibrations
Which of the following electromagnetic wave has the longest wavelength?
A
radio-waves
B
gamma rays
C
infrared waves
D
ultraviolet rays
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 #35329)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
In order to prevent bar magnets from losing their strength, they are stored wih keepers such that the two bars are placed with
A
like poles facing each other and the keepers placed between them
B
like poles facing each other and the keepers placed between them
C
unlike poles facing each other and the keepers placed at their ends
D
unlike poles facing each other and the keepers placed between them
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 #35349)
Physics
WAEC / WASSCE 2010
Magnetism, Electromagnetism & AC Circuits
The energy, E stored in an inductor of inductance L when current I passes through it is given by the equation
A
E = \(\frac{1}{2} LI^2\)
B
E = LI2
C
E \(\frac{1}{2}LI\)
D
E = \(\frac{1}{2} L^2I\)
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 #35351)
Physics
WAEC / WASSCE 2010
Magnetism, Electromagnetism & AC Circuits
The resonant frequency of an a.c circuit is 1000 kHz. If each of the capacitance and inductance in the circuit is reduced by 50%, and no other changes are made, the resonant frequency will become
A
250kHz
B
750kHz
C
1000kHz
D
2000kHz
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 #35352)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Solution
Eddy currents can be reduced by
A
using coil of high resistance
B
winding the coil on a soft iron core
C
creating holes in the metal plates
D
using coil of low resistance
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
This method interrupts the flow of eddy currents by increasing the resistance in the path of the currents, thereby reducing their magnitude.
Other Options:
A. Using a high-resistance coil: This does not directly affect eddy currents in conductive materials.
B. Winding the coil on a soft iron core can enhance magnetic effects and may not reduce eddy currents.
D. Using low resistance coil: This would not help reduce eddy currents; it could potentially increase the flow of currents.
Source: Myschool Past Questions Archive (Record #35353)
Physics
WAEC / WASSCE 2010
Atomic, Quantum, Nuclear Physics & Electronics
Solution
An electron moves with a speed of 2.0 x 10\(^6\)ms\(^{-1}\) in a straight line. Calculate the wavelength of the electron wave. [mass of an electron = 9.1 x 10\(^{-31}\) kg][Planck's constant = 6.6 x 10\(^{-34}\)Js]
A
3.63 x 10-10m
B
6.51 x 10-9m
C
4.24 x 10-8m
D
7.25 x 10-8m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\lambda = \frac{\text{h}}{\text{mv}}\)
mv = 9.1 \(\times 10^{-31} \times 2.0 \times 10^6 = 1.82 \times 10^{-24} \, \text{kg m/s}\)
\(\lambda = \frac{6.6 \times 10^{-34}}{1.82 \times 10^{-24}} = 3.63 \times 10^{-10} \, \text{m}\)
3.63 \times 10\(^{-10}\)
Source: Myschool Past Questions Archive (Record #35355)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Diagram
Solution
Determine the potential difference. V across the parallel resistors
Attached Figure / Diagram
A
2.0V
B
2.3V
C
3.0V
D
0.7V
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
6\Omega and 4\Omega are parallel.
\(\frac{1}{R_T}\) = \(\frac{1}{R_1} + \frac{1}{R_2}\)
\(\frac{1}{R_T}\) = \(\frac{1}{6} + \frac{1}{4}\)
\(R_T\) = \(\frac{12}{5}\) = 0.97\Omega
V = IR
= 0.97 x 2.4 = 2.3V
Source: Myschool Past Questions Archive (Record #35338)
Physics
WAEC / WASSCE 2010
Current Electricity & Electric Circuits
Solution
A galvanometer of internal resistance 50\(\Omega\) and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950\(\Omega\) in series to it. Calculate the maximum voltage that can be read by the voltmeter
A
20V
B
30V
C
38V
D
40V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
V = IR1 + IR2
= 0.02 x 50 + 0.02 x 1950 = 40V
Source: Myschool Past Questions Archive (Record #35341)