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Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Two strings each inclined at an angle 30o to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension i n each string.
A
20 (\sqrt{3}\)N
B
20N
C
10 (\sqrt{3}\)N
D
10N
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 #45438)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms-2]
A
500.0ms-1
B
100.0ms-1
C
70.0ms-1
D
50.0ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V2 = U2 + 2gs
V2 = 0
V2 = 2gs
h = 500m
g = 10ms-2
V2 2 x 10 x 500
V2 = 10,000
V = \(\sqrt{10000}\)
V = 100ms-1
Source: Myschool Past Questions Archive (Record #45442)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.
A
133.2g
B
66.0g
C
60.0g
D
22.0g
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
clockwise movement = anticlockwise movement
w x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g
Source: Myschool Past Questions Archive (Record #45443)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms-2]
A
10J
B
103J
C
104J
D
105J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Ke = mgh
Ke = Pe
\(\frac{1}{2}\)MV2 = mgh
Ke = 1000 x 10 x 10
Ke = 100000J
Ke = 105J
Source: Myschool Past Questions Archive (Record #45444)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of
A
thermal equilibrium of the sheets
B
conduction of heat by the sheets
C
contraction of the sheets
D
expansion of the sheets
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 #45445)
Physics
WAEC / WASSCE 2015
Waves and Optics
What type of wave is emitted by a loud speaker?
A
Transverse
B
Longitudinal
C
Gamma
D
Radio
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 #45467)
Physics
WAEC / WASSCE 2015
Waves and Optics
Solution
An object is placed 15cm from a diverging lens of focal length 12cm. The image of the object formed by the lens in
A
real and 6.67cm from the lens
B
virtual and 6.67cm from the lens
C
real and 60.00cm from the lens
D
virtual and 60.00cm from the lens
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The focal length of a diverging lens is negative.
f = -12 cm; u = 15 cm.
\(f = \frac{uv}{u + v}\)
\(-12 = \frac{15v}{15 + v}\)
\(-12 (15 + v) = 15v \implies -180 - 12v = 15v\)
\(-180 = 15v + 12v \implies -180 = 27v\)
\(v = \frac{-180}{27} = -6.67 cm\)
The image is virtual and 6.67 cm from the lens.
Source: Myschool Past Questions Archive (Record #45468)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Solution
A swimming pool is 2.1m deep. If it contains water of refractive index 1.3, calculate the apparent depth of pool
A
3.4m
B
2.7m
C
1.6m
D
0.8m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\text{real depth}}{\text{apparent depth}}\)
1.3 = \(\frac{2.1}{\text{apparent}}\)
A.D = \(\frac{2.1}{1.3} = 1.6\)
Source: Myschool Past Questions Archive (Record #45472)
Physics
WAEC / WASSCE 2015
Waves and Optics
When an air column is set into vibrations, the distance between two consecutive nodes of the resultant wave is
A
one quarter of the wavelength
B
half of the wavelength
C
the wavelength
D
twice the wavelength
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 #45489)
Physics
WAEC / WASSCE 2015
Waves and Optics
Solution
A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms-1]
A
23m
B
128m
C
288m
D
298m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = \(\frac{2nx}{E}\)
= \(\frac{2 \times 1 \times X}{0.8} = 320\)
2x = 0.8 x 320
x = \(\frac{0.8 \times 320}{2}\)
= 128m
Source: Myschool Past Questions Archive (Record #45503)
Physics
WAEC / WASSCE 2015
Thermal Physics
Diagram
In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60oC is known as the
Attached Figure / Diagram
A
vaporization point
B
cooling temperature
C
boiling point
D
melting point
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 #45456)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following concepts is a method of heat transfer that does not require a material medium?
A
conduction
B
radiation
C
diffusion
D
convection
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 #45457)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
Which of the following units is the S.I. unit of heat capacity?
A
Jkg-1
B
Jkg-1 K-1
C
JK-1
D
Jg-1K-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat capacity = \(\frac{\text{Heat energy supplied}}{\text{Rise in temperature}}\)
= JK\(^{-1}\)
Source: Myschool Past Questions Archive (Record #45458)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
The pressure applied to an enclosed fluid to one end id transmitted equally throughout the fluid and to the container walls. This statement is
A
Archimede's principle
B
Bernoulli's principle
C
Pascal's principle Heisenberg's
D
Heisenberg's uncertainty principle
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 #45461)
Physics
WAEC / WASSCE 2015
Waves and Optics
Diagram
Solution
The diagram given illustrates a wave form. Determine the speed of the wave
Attached Figure / Diagram
A
5.4 ms-1
B
8.4 ms-1
C
9.6 ms-1
D
10.0 ms-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The diagram illustrates three complete cycles over a distance of 9 m. Therefore, the wavelength \lambda is 9 m / 3 = 3 m.
The time t = 0.6 s corresponds to two periods (based on the labeling in the diagram spanning two cycles). Therefore, the period T is \(\frac{0.6 s }{2}\) = 0.3 s.
The speed of the wave v is given by v = \(\frac{\lambda }{\text{T}}\) = \(\frac{3 m }{0.3 s}\) = 10 m/s.
Source: Myschool Past Questions Archive (Record #45466)