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Physics
WAEC / WASSCE 2010
Waves and Optics
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 and Optics
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
Waves and Optics
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 and Optics
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
Heat Energy & Temperature
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
Mechanics and Properties of Matter
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
Waves and Optics
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
Electricity and Magnetism
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
Waves and Optics
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
Heat Energy & Temperature
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
Electricity and Magnetism
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)
Physics
WAEC / WASSCE 2010
Heat Energy & Temperature
In the wiring of houses, the fuse is connected to the wire coloured
A
blue
B
brown
C
yellow
D
yellow and green
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 #35344)
Physics
WAEC / WASSCE 2010
Electricity and Magnetism
Which of the following factors does not affect the electric resistance of wire?
A
length
B
mass
C
temperature
D
cross-sectional area
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 #35345)
Physics
WAEC / WASSCE 2010
Heat Energy & Temperature
Which of the following factors will increase the sensitivity of moving coil meter?
A
strong spring
B
low numbers of turns
C
small area of coil
D
soft iron core
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 #35346)
Physics
WAEC / WASSCE 2010
Waves and Optics
The amplitude of a sound wave determines its
A
frequency
B
quality
C
loudness
D
pitch
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 #35330)