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Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Which of the following statements correctly defines a simple machine? A device
A
that can produce electric current
B
which can only carry people from one place to another
C
with which work can be done easily
D
which changes the state of rest or of uniform motion of an object
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 #35441)
Physics
WAEC / WASSCE 2011
Modern Physics and Nuclear Physics
Solution
The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency
A
600.0N
B
40.0N
C
24.0N
D
20.0N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V.R = \(\frac{R}{r} = \frac{30}{6} = 5\)
\(\gamma = \frac{M.A}{V.R} \times \frac{100}{1} \)
M.A = \(\frac{100 \times 5}{100} = 5\)
Effort = \(\frac{L}{M.A} = \frac{120}{5}\)
= 24N
Source: Myschool Past Questions Archive (Record #35442)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
A hypsometer is used for determining
A
steam point
B
relative humidity
C
ice point
D
relative density
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 #35443)
Physics
WAEC / WASSCE 2011
Modern Physics and Nuclear Physics
Which of the following equations shows how how the linear expansivity (\(\alpha\)) and the cubic expansivity (\(\gamma\)) of a material are related?
A
\(\gamma = \alpha\)
B
\(\gamma = 1 - \alpha\)
C
\(\gamma = 2 \alpha\)
D
\(\gamma = 3 \alpha\)
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 #35445)
Physics
WAEC / WASSCE 2011
Thermal Physics
Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0oC and 4oC. ii. There is expansion between 0oC and 100oC. iii. The volume is minimum at 4oC. iv. The volume is maximum at 4oC
A
i and ii only
B
ii and iii only
C
i and iii only
D
ii and iv only
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 #35447)
Physics
WAEC / WASSCE 2011
Mechanics and Properties of Matter
Solution
Which of the following assumptions is not valid for an ideal gas ?
A
molecules of a particular gas are identical
B
molecules moves freely throughout the volume of the container
C
force of attraction between molecules is negligible
D
molecules move at constant speed between collisions
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
In an ideal gas, molecules do not move at constant speed between collisions. Their speeds vary due to elastic collisions with other molecules and the walls of the container. The other assumptions—identical molecules, free movement throughout the container, and negligible forces of attraction—are valid for an ideal gas.
Source: Myschool Past Questions Archive (Record #35449)
Physics
WAEC / WASSCE 2011
Mechanics and Properties of Matter
Solution
A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied
A
0.2s
B
2.5s
C
25.0s
D
250.0s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
t = \(\frac{fs}{p} = \frac{20 \times 500}{0.4 \times 1000} = 25s\)
Source: Myschool Past Questions Archive (Record #35452)
Physics
WAEC / WASSCE 2011
Thermal Physics
Solution
A metal of mass 200g at a temperature of 100oC is placed in 100g of water at 25oC in a container of negligible heat capacity. If the final steady temperature is 30oC, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg-1 K-1]
A
150 Jkg-1K-1
B
300 Jkg-1K-1
C
320 Jkg-1K-1
D
1960 Jkg-1K-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
MC\(\theta\)metal = MC\(\theta _{water}\)
0.2 x C x 70 = 0.1 x 4200 x 5
C = 150
Source: Myschool Past Questions Archive (Record #35454)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Ether produces a cooling effect when it is poured on the hand because it has
A
low conductivity
B
high conductivity
C
high latent heat of vaporization
D
low latent heat of vaporization
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 #35455)
Physics
WAEC / WASSCE 2011
Waves and Optics
Which of the following statements about the image formed by a plane mirror is not correct?
A
it is laterally inverted
B
it has unit magnifiation
C
it is formed by actual intersection of rays
D
its distance from the mirror is equal to that of the object from the mirror
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 #35457)
Physics
WAEC / WASSCE 2011
Waves and Optics
The image formed by a convex mirror is always
A
real, erect and diminished
B
real, inverted and diminished
C
virtual, inverted and diminished
D
virtual, erect and diminshed
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 #35458)
Physics
WAEC / WASSCE 2011
Waves and Optics
Solution
A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism
A
1.48
B
1.50
C
1.53
D
1.67
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\sin \frac{1}{2} (dm + A)}{\sin \frac{1}{2} A}\)
= \(\frac{\sin \frac{1}{2} (40 + 60)}{\sin \frac{1}{2} \times 60}\)
= 1.532
Source: Myschool Past Questions Archive (Record #35461)
Physics
WAEC / WASSCE 2011
Waves and Optics
Total internal reflection occurs in an optical prism when light rays
A
travel from the prism into an optically denser medium
B
are incident in the prism at an angle greater than the critical angle
C
are incident normally in the prism
D
travel from the prism to the air
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 #35470)
Physics
WAEC / WASSCE 2011
Waves and Optics
The speed of light in a certain medium is V while its speed in a vacuum is C. The absolute refractive index of the medium is
A
C + V
B
\(\frac{C}{V}\)
C
\(\frac{V}{C}\)
D
C - V
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 #35471)
Physics
WAEC / WASSCE 2011
Waves and Optics
Solution
An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance
A
1.3cm
B
8.6cm
C
35.0cm
D
60.0cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\frac{1}{v} = \frac{1}{f} - \frac{1}{U}\)
\(\frac{1}{15} - \frac{1}{20} = 60cm\)
Source: Myschool Past Questions Archive (Record #35473)