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Physics
WAEC / WASSCE 2011
Calorimetry, Latent Heat & Change of State
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
Calorimetry, Latent Heat & Change of State
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
Reflection, Refraction & Dispersion of Light
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
Reflection, Refraction & Dispersion of Light
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
Reflection, Refraction & Dispersion of Light
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
Reflection, Refraction & Dispersion of Light
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
Reflection, Refraction & Dispersion of Light
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
Lenses & Optical Instruments
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)
Physics
WAEC / WASSCE 2011
Lenses & Optical Instruments
Presbyopia is a defect of the eye resulting from
A
weak ciliary muscles
B
short eyeball
C
loss of sphericity of the lens
D
long eyeball
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 #35474)
Physics
WAEC / WASSCE 2011
Lenses & Optical Instruments
The focal length of the eye-piece of an astronomical telescope is f1, while the focal length of the object is f2. Fro normal adjustment, the angular magnification is given by
A
\(\frac{f_2}{f_1}\)
B
1 - \(\frac{f_2}{f_1}\)
C
\(\frac{f_2}{f_1}\) - 1
D
\(\frac{f_1}{f_2}\)
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 #35476)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period
A
0.5s
B
1.0s
C
1.2s
D
2.0s
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(f_1 - f_2 = \frac{1}{T}\)
12 - 10 = \(\frac{1}{2}\)
= 0.5
Source: Myschool Past Questions Archive (Record #35478)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Which of the following substances does not conduct electricity?
A
graphite
B
glass
C
sulphuric acid
D
table salt solution
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 #35486)
Physics
WAEC / WASSCE 2011
Electrostatics & Capacitors
Solution
The unit of capacitance is
A
farad
B
coulomb
C
henry
D
ohms
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The capacitance of any capacitor is its ability to store charge, and The SI unit is farad(F).
Source: Myschool Past Questions Archive (Record #35489)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
An ammeter with a full scale deflection of 10mA has an internal resistance 0.5\(\Omega\). calculate the resistance of the shunt required to adapt it to read up to 3A
A
0.0167\(\Omega\)
B
0.0130\(\Omega\)
C
0.0250\(\Omega\)
D
0.1000\(\Omega\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(R_2 = \frac{I_1R_1}{I_2} = \frac{0.01 \times 5}{2.99}\)
= 0.0167
Source: Myschool Past Questions Archive (Record #35492)
Physics
WAEC / WASSCE 2011
Current Electricity & Electric Circuits
Solution
The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation
A
\(\mathit{P} = \frac{RA}{l}\)
B
\(\mathit{P} = \frac{l}{RA}\)
C
\(\mathit{P} = \frac{Rl}{A}\)
D
\(\mathit{P} = \frac{R}{Al}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
resistivity P is directly proportional to the product of resistance and cross-sectional area and inversely proportional to the length of the wire
Source: Myschool Past Questions Archive (Record #35494)