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Physics
WAEC / WASSCE 2006
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
which of the following statements about simple harmonic motion is correct? The
A
total mechanical energy is always conserved
B
linear acceleration is directed to any variable point
C
linear acceleration varies inversely with displacement
D
period of oscillation varies linearly as acceleration due to gravity
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
In SHM, the total mechanical energy (the sum of potential and kinetic energy) remains constant, provided no damping or external forces are acting on the system.
Source: Myschool Past Questions Archive (Record #34650)
Physics
WAEC / WASSCE 2006
Newton's Laws, Momentum & Collisions
Solution
A force acting on a body causes a change in the momentum of a body from 12 kg ms-1 to 16kg ms-1 in 0.25. Calculate the magnitude of the impulse
A
28.0Ns
B
20.0Ns
C
4.0Ns
D
0.8Ns
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Ft = I = MY - Mv
I = 16 - 12 = 4Ns
Source: Myschool Past Questions Archive (Record #34652)
Physics
WAEC / WASSCE 2006
Current Electricity & Electric Circuits
Which of the following source of energy is renewable?
A
petroleum
B
charcoal
C
hydro
D
nuclear
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 #34653)
Physics
WAEC / WASSCE 2006
Linear Motion, Projectiles & Kinematics
Solution
A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms-1, calculate the initial kinetic energy of the stone
A
200J
B
400J
C
800J
D
1600J
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
K.E = \(\frac{1}{2}Mv^2 = \frac{1}{2} \times 2 \times 20^2 = 400J\)
Source: Myschool Past Questions Archive (Record #34654)
Physics
WAEC / WASSCE 2006
Current Electricity & Electric Circuits
Which of the following statements about the mouth piece of a telephone is correct? It converts sound energy into
A
acoustic energy
B
mechanival energy
C
electrical energy
D
heat energy
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 #34655)
Physics
WAEC / WASSCE 2006
Work, Energy, Power & Simple Machines
The potential energy in an elastic string of force constant K which has been extended by X metres is expresses as
A
\(\frac{1}{2}k \Box ^2\)
B
\(k \Box ^2\)
C
\(\frac{1}{2}k \Box \)
D
\(k \Box \)
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 #34656)
Physics
WAEC / WASSCE 2006
Current Electricity & Electric Circuits
Solution
The engine of a train produces a force of 3000N when moving at 30.ms-1. calculate the power of the engine
A
1.00 x 102W
B
3.00 x 104W
C
9.00 x 104W
D
3.00 x 105W
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = FV
= 3 x 103 x 30
= 9 x 104W
Source: Myschool Past Questions Archive (Record #34657)
Physics
WAEC / WASSCE 2006
Work, Energy, Power & Simple Machines
The velocity ratio of an inclined plane, inclines at an angle \(\theta\) to the horizontal can be expressed as
A
(sin \(\theta)^{-1}\)
B
\(\sin \theta\)
C
(cos \(\theta)^{-1}\)
D
\(\cos \theta\)
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 #34658)
Physics
WAEC / WASSCE 2006
Work, Energy, Power & Simple Machines
Solution
A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W
A
300N
B
200N
C
140N
D
120N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
M.A = \(\frac{E \times V.R}{100} = \frac{40 \times 6}{100} = \frac{12}{5}\)
W = M.A x effort
= \(\frac{12}{5} \times 50 = 120N\)
Source: Myschool Past Questions Archive (Record #34659)
Physics
WAEC / WASSCE 2006
Temperature, Thermometry & Thermal Expansion
The sagging of overhead electrical cables is the consequence of
A
linear expansivity
B
superficial expansivity
C
cubic expansivity
D
conductivity
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 #34660)
Physics
WAEC / WASSCE 2006
Gas Laws & Heat Transfer
The silvered surface in a vacuum flask reduces heat loos due to
A
conduction
B
convection
C
radiation
D
evaporation
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 #34661)
Physics
WAEC / WASSCE 2006
Calorimetry, Latent Heat & Change of State
Solution
How long will it take to heat 3kg of water from 28oC to 88oC in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg-1K-1]
A
120s
B
570s
C
600s
D
836s
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
t = \(\frac{mc\theta}{IV} = \frac{3 \times 4189 \times 60}{6 \times 120} = 570s\)
Source: Myschool Past Questions Archive (Record #34662)
Physics
WAEC / WASSCE 2006
Calorimetry, Latent Heat & Change of State
The amount of energy required to change a kilogram of ice in water without a change in temperature is
A
heat capacity of ice
B
specific heat capacity
C
specific latent heat of vaporisation of ice
D
specific latent heat of fusion of ice
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 #34663)
Physics
WAEC / WASSCE 2006
Calorimetry, Latent Heat & Change of State
Solution
A quantity of steam at 100oC condenses to water at the same temperature by releasing 6.9 x 104J of energy. Calculate the mass of the condensed steam. [specific latent heat of vaporization of eater = 2.3 x 106 J kg-1]
A
3.0 x 10-1 kg
B
3.0 x 10-2 kg
C
3.0 x 10-3 kg
D
3.0 x 10-4 kg
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
M = \(\frac{Q}{T} = \frac{6.9 \times 10^{4}}{2.3 \times 10^6} = 3 \times 10^{-2} kg\)
Source: Myschool Past Questions Archive (Record #34664)
Physics
WAEC / WASSCE 2006
Calorimetry, Latent Heat & Change of State
The temperature of a liquid falls after some of it has evaporated because
A
the liquid left is smaller in volume and the breeae easily cools it
B
the more energetic molecules have escaped into the atmosphere
C
the liquid left has less latent heat
D
after evaporation impurites are left behind
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 #34665)