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Physics
WAEC / WASSCE 2002
Work, Energy, Power & Simple Machines
Solution
Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved
A
parallel to the line of action of the force from a reference point
B
perpendicular to the line of action of the force from a reference point
C
on a line through the reference point
D
by the object
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The quantity of work done (or energy converted) by a force, when the force moves, depends on two obvious factors:
- the distance moved (in the direction along which the force acts) and
- the magnitude (strength) of the force
Source: Myschool Past Questions Archive (Record #34009)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Solution
a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]
A
60W
B
80W
C
100W
D
120W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
p = \(\frac{mgh}{t} = \frac{120 \times 10 \times 2}{30} = 80W\)
Source: Myschool Past Questions Archive (Record #34016)
Physics
WAEC / WASSCE 2002
Work, Energy, Power & Simple Machines
Solution
A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages
A
12.0
B
10.0
C
3.6
D
1.8
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
M.A = \(\frac{Z \times V.R}{100}\)
= \(\frac{60 \times 6}{100}\) = 3.6
Source: Myschool Past Questions Archive (Record #34019)
Physics
WAEC / WASSCE 2002
Work, Energy, Power & Simple Machines
Which of the following actions will improve the efficiency of the pulley system?
A
reducing the mass of the pulley
B
increasing the friction force between the string and the pulley
C
increasing the mass per unit length of the string of the pulley
D
increasing the mass of the pulley
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 #34020)
Physics
WAEC / WASSCE 2002
Temperature, Thermometry & Thermal Expansion
Solution
The ice and steam points of a certain thermometer are -20^\circ and 100^\circ respectively. Calculate the Celsius temperature corresponding to 70^\circ on the thermometer
A
84.0o
B
75.0o
C
64.0o
D
58.0o
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{70 -(- 20)}{100 -(-20)} = \frac{\theta - 0}{100 - 0}\)
\(\theta = \frac{90 \times 100}{120} = 75^oC\)
Source: Myschool Past Questions Archive (Record #34024)
Physics
WAEC / WASSCE 2002
Gas Laws & Heat Transfer
The silver coating on the inside of a vacuum flask reduces heat loss by
A
conduction
B
radiation
C
condensation
D
convention
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 #34025)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Solution
Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]
A
60oC
B
40oC
C
25oC
D
10oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
120 x 4.2(50 - \(\theta\)) = 200 x 4.2(\(\theta\) - 10)
\(\theta = \frac{33600}{1344} = 25^oC\)
Source: Myschool Past Questions Archive (Record #34030)
Physics
WAEC / WASSCE 2002
Calorimetry, Latent Heat & Change of State
Solution
Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]
A
113,000J
B
117,200J
C
234,400J
D
420,000J
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260
= 117,200J
Source: Myschool Past Questions Archive (Record #34072)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?
A
Random
B
Rational
C
Translational
D
vibratory
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 #34073)
Physics
WAEC / WASSCE 2002
Waves, Sound & Vibrations
A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is
A
transverse
B
longitudinal
C
stationary
D
electromagnetic
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 #34077)
Physics
WAEC / WASSCE 2002
Waves, Sound & Vibrations
Solution
A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave
A
4.50 x 1010Hz
B
5.0 x 109Hz
C
4.5 x 109Hz
D
2.0 x 106Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
f = \(\frac{V}{\lambda} = \frac{3 \times 10^8}{150}\)
= 2.0 x 10\(^6\) Hz
Source: Myschool Past Questions Archive (Record #34078)
Physics
WAEC / WASSCE 2002
Waves, Sound & Vibrations
In the wave equation y = Eo, sin(299t - \(\pi\)), Eo represents the
A
amplitude
B
frequency
C
period
D
wavelength
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 #34079)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
The size of the hole of a pin hole camera is increased. The resultant image formed becomes
A
sharper
B
reduced in size
C
enlarged
D
blurred
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 #34080)
Physics
WAEC / WASSCE 2002
Reflection, Refraction & Dispersion of Light
Solution
The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium
A
68o
B
56o
C
34o
D
18o
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
c = \(\sin^{-1} \frac{1}{n} = \sin^{-1} \frac{1}{1.8} = 34^o\)
Source: Myschool Past Questions Archive (Record #34081)
Physics
WAEC / WASSCE 2002
Lenses & Optical Instruments
Solution
A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens
A
10.00cm
B
6.00cm
C
5.00cm
D
1.50cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{1}{u} + \frac{1}{v} = \frac{1}{f} = \frac{1}{15} + \frac{1}{10}\)
u = 6.00
Source: Myschool Past Questions Archive (Record #34082)