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Physics
WAEC / WASSCE 2012
Atomic, Quantum, Nuclear Physics & Electronics
The thermopile is a device for detecting
A
radioactive radiations
B
radiant energy
C
x-rays
D
the presence of electrons
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 #35567)
Physics
WAEC / WASSCE 2012
Current Electricity & Electric Circuits
Solution
In the formation of sea breeze. wind blows from
A
sky to land
B
sea to sky
C
land to sea
D
sea to land
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
A sea breeze describes a wind that blows from the ocean (sea) inland towards land.
Source: Myschool Past Questions Archive (Record #35568)
Physics
WAEC / WASSCE 2012
Calorimetry, Latent Heat & Change of State
Solution
A piece of copper of mass 20g at a temperature of 110^\circC was dropped into a mixture of ice and water at 0^\circC. If the final steady temperature of the mixture is 0^\circC . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 330Jg\(^{-1}\)]
A
0.37g
B
0.60g
C
2.40g
D
2.70g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Mice = \(\frac{MC}{\theta}\)
= \(\frac{20 \times 0.4 \times 110}{330}
Heat lost by copper = Heat gained by ice
m\(_{copper}\) c \(\theta\) = m\(_{ice}\) L
20 x 0.4 x (110 - 0) = m\(_{ice}\) x 330
m\(_{ice}\) = \(\frac{20 \times 0.4 \times 110}{330}\)
= \(\frac{8}{3}\)
= 2.67 g
= 2.70g (to 1 d.p)
Source: Myschool Past Questions Archive (Record #35581)
Physics
WAEC / WASSCE 2012
Calorimetry, Latent Heat & Change of State
Solution
Which of the following factors decreases the rate of evaporation of a liquid?
A
increase in pressure over the liquid
B
lowering the boiling point
C
decreasing in humidity
D
wind
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
higher pressure tends to inhibit the process of evaporation. Higher pressure "pushes" the vapor molecules back into the liquid, making it harder for them to evaporate.
Source: Myschool Past Questions Archive (Record #35585)
Physics
WAEC / WASSCE 2012
Waves, Sound & Vibrations
When two waves are superimposed on each other, the following occurrences are possible, except
A
nodal lins
B
anti nodal lines
C
stationary waves
D
dispersion
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 #35587)
Physics
WAEC / WASSCE 2012
Waves, Sound & Vibrations
Which of the following properties of waves is exclusive to transverse waves?
A
reflection
B
interference
C
diffraction
D
polarization
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 #35589)
Physics
WAEC / WASSCE 2012
Reflection, Refraction & Dispersion of Light
Solution
An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.
A
2.5 cm
B
3.0cm
C
5.0cm
D
25.0cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{1}{v} = \frac{1}{f} - \frac{1}{u}\)
= \(\frac{1}{10} - \frac{1}{2} = \frac{1}{20}\)
v = 20
but h\(_i\) = \(\frac{v \times h_o}{u}\)
= \(\frac{20 \times 2.5 }{20}\)
= 2.5cm
Source: Myschool Past Questions Archive (Record #35592)
Physics
WAEC / WASSCE 2012
Reflection, Refraction & Dispersion of Light
Solution
A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is \(\frac{4}{3}\) and air to glass is \(\frac{3}{2}\), calculate the refractive index of glass relative to water
A
0.50
B
0.67
C
0.75
D
1.13
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(_{g} \eta _{w} = \frac{ _g \eta _a}{ _a \eta _w}\)
= \(\frac{3}{2} \times \frac{1}{\frac{4}{3}}\)
= \(\frac{3}{2} \times \frac{3}{4}\)
= \(\frac{9}{8}\)
= 1.125
= 1.13 (to 2 d.p)
Source: Myschool Past Questions Archive (Record #35594)
Physics
WAEC / WASSCE 2012
Lenses & Optical Instruments
An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between
A
F and X
B
X and C
C
C and F
D
F and 2F
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 #35596)
Physics
WAEC / WASSCE 2012
Lenses & Optical Instruments
A telescope is said to be in normal adjustment when the
A
focal length of he objective is greater than that of the eyepiece
B
focal length of the eyepiece is greater than that of the objective
C
focal length of the eyepiece is equal to that of the objective
D
objective focal point coincides wih that of the eyepiece
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 #35602)
Physics
WAEC / WASSCE 2012
Waves, Sound & Vibrations
The sound heard by a person after the reflection of the sound generated by him is called
A
reverberation
B
resonance
C
echo
D
audibility
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 #35605)
Physics
WAEC / WASSCE 2012
Reflection, Refraction & Dispersion of Light
Solution
Which of the following sets of coloured light is/are secondary colours i. Red, Blue and green ii. Blue, cyan and magneta iii. Green, Magenta and yellow, IV Yellow, Cyan and Magenta
A
i and ii only
B
ii and iii only
C
iv only
D
i, ii and iv only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
IV. (Yellow, Cyan, Magenta) is the only complete set of secondary colours.
Source: Myschool Past Questions Archive (Record #35607)
Physics
WAEC / WASSCE 2012
Work, Energy, Power & Simple Machines
Solution
When two like charges are brought together, the potential energy of the system formed will
A
increase because work is done against the field
B
increase because work is done by the field
C
decrease because work is done by the field
D
decrease because work is done against the field
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
if two like charges are close together, they repel each other. moving them closer together requires working against repulsive force which increases the potential energy of the system.
Source: Myschool Past Questions Archive (Record #35611)
Physics
WAEC / WASSCE 2012
Work, Energy, Power & Simple Machines
An atom in an excited state is one whose
A
potential energy is minimum
B
potential energy is maximum
C
electron are in the conduction band
D
electron have moved to higher energy level
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 #35641)
Physics
WAEC / WASSCE 2012
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is
A
1.0eV
B
3.0eV
C
4.0eV
D
7.0eV
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
K.E = hf - Wo
= 4 - 3 = 1eV
Source: Myschool Past Questions Archive (Record #35643)