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Physics
WAEC / WASSCE 2003
Work, Energy, Power & Simple Machines
Which of the following statements correctly defines a simple machine? a device
A
that can provide 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 along a straight ine
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 #34182)
Physics
WAEC / WASSCE 2003
Temperature, Thermometry & Thermal Expansion
Solution
A platinum resistance thermometer has a resistance 4\(\Omega\) at 0oC and 10\(\Omega\) at 100oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45oC.
A
14.0\(\Omega\)
B
6.7\(\Omega\)
C
3.2\(\Omega\)
D
2.7\(\Omega\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{R - 4}{10 - 4} = \frac{45 - 0}{100 - 0}\)
R = \(\frac{670}{100} = 6.7\Omega\)
Source: Myschool Past Questions Archive (Record #34208)
Physics
WAEC / WASSCE 2003
Temperature, Thermometry & Thermal Expansion
Solution
A metal rod of length 100cm is heated through 100ºC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10\(^{-5}\)K\(^{-1}\)]
A
4mm
B
3mm
C
2mm
D
1mm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(I_2 - I_1 = I_1 \times \theta \times \alpha = 1 \times 100 \times 3 \times 10^{-5}\)
= 3 x 10\(^{-3}\)m
= 3mm
Source: Myschool Past Questions Archive (Record #34210)
Physics
WAEC / WASSCE 2003
Calorimetry, Latent Heat & Change of State
The heat capacity of a calorimeter is the amount of energy required to
A
change the temperature of 1kg of the calorimeter by 1k
B
change 1kg mass of the calorimeter to liquid at the same temperature
C
change the temperature of the calorimeter
D
melt the calorimeter into liquid at a constant temperature
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 #34211)
Physics
WAEC / WASSCE 2003
Calorimetry, Latent Heat & Change of State
Which of the following statement about latent heat of vaporization is correct? It
A
weakens the adhesive force between molecules of a liquid and those of its container
B
breaks completely the force of attraction completely between the molecules of a liquid
C
add to the heat content of a liquid
D
increases the cohesive forces between liquid molecules
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 #34212)
Physics
WAEC / WASSCE 2003
Current Electricity & Electric Circuits
When the pressure of a fixed mass of gas is doubled at constant temperature, the volume of the gas is
A
increased four times
B
doubled
C
unchangeable
D
halved
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 #34213)
Physics
WAEC / WASSCE 2003
Gas Laws & Heat Transfer
Solution
The volume of a given mass of an ideal gas at 327k and 9.52 x 104 Pa is 40cm3. calculate the volume of the gas at 273k and 1.034 x 105Pa.
A
68.23cm3
B
47.91cm3
C
44.60cm3
D
30.75cm3
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(V_2 = \frac{P_1V_1T_2}{P_2T_1} = \frac{9.52 \times 10^4 \times 40 \times 273}{1.034 \times 10^5 \times 327}\)
= 30.75cm3
Source: Myschool Past Questions Archive (Record #34214)
Physics
WAEC / WASSCE 2003
Reflection, Refraction & Dispersion of Light
Which of the following condition is necessary for the occurrence of total internal reflection of light?
A
light must travel from an optical less dense to a denser medium
B
the angle of incidence must be equal to the critical angle
C
the angle of incidence must be greater than the critical angle
D
the angle of refraction must be 90o
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 #34216)
Physics
WAEC / WASSCE 2003
Current Electricity & Electric Circuits
Solution
The image which cannot be formed on a screen is said to be
A
inverted
B
erect
C
real
D
virtual
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Any image that can be formed on a screen are called real image. Such images are formed by light rays emanating from the object, when reflected and/or refracted by devices such as lenses and mirrors converge at some specific point.
In contrast there are other images which are formed by the rays of light reaching the observer appearing to converge at some point. This happens when the rays reaching the observer are diverging and when the line of these rays are projected backward. Such images, which cannot be formed on a screen, are called virtual image.
Source: Myschool Past Questions Archive (Record #34217)
Physics
WAEC / WASSCE 2003
Reflection, Refraction & Dispersion of Light
An object is placed on the principal axis and at the centre of curvature of a concave mirror, the image of the image formed by the mirror is
A
real and magnified
B
real and inverted
C
erect and magnified
D
erect and virtual
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 #34218)
Physics
WAEC / WASSCE 2003
Lenses & Optical Instruments
Solution
A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length
A
100cm
B
33cm
C
29cm
D
20cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
M = \(\frac{v}{u}\)
v = mu = 4 x 25 = 100m
\(\frac{1}{v} + \frac{1}{u} = \frac{1}{f}\)
\(\frac{1}{100} + \frac{1}{25} = \frac{1}{f}\)
f = 20cm
Source: Myschool Past Questions Archive (Record #34219)
Physics
WAEC / WASSCE 2003
Reflection, Refraction & Dispersion of Light
Solution
The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir
A
2.35m
B
1.35m
C
1.00m
D
0.35m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
n = \(\frac{R.d}{A.d}\)
1.35 = \(\frac{R.d}{1}\)
R.d = 1.35m
Source: Myschool Past Questions Archive (Record #34220)
Physics
WAEC / WASSCE 2003
Lenses & Optical Instruments
Solution
A converging lens has a focal length of 5cm. Determine its power
A
+20.0
B
+0.2
C
-20.00
D
-0.2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
p = \(\frac{100}{f} = \frac{100}{+5} = +20\)
Source: Myschool Past Questions Archive (Record #34221)
Physics
WAEC / WASSCE 2003
Current Electricity & Electric Circuits
Which of the following pairs of rays shows the widest separation in the spectrum of white light?
A
green and blue
B
orange and indigo
C
blue and violet
D
red and yellow
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 #34222)
Physics
WAEC / WASSCE 2003
Lenses & Optical Instruments
Which of the following statements about the human eye and the camera is correct?
A
both form virtual image of objects
B
the image formed by the eye is upright in the retina while that formed by the camera is inverted on the film
C
the inside of both of them is blackened to absorb unwanted light
D
the focal length of both eye lens and the camera lens can be varied
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 #34223)