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Physics
WAEC / WASSCE 2004
Equilibrium of Forces, Moments & Flotation
Solution
An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X
A
3.300
B
1.279
C
0.932
D
0.782
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
R.d = Wt in Air-Wt in Air-Wt in water
= \(\frac{60.0 - 48.2}{60.0 - 44.9}\)
= 0.782
Source: Myschool Past Questions Archive (Record #34268)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine
A
increased the surface tension of the water
B
reduces the density of the water
C
reduces the surface tension of the water
D
reduces the upthrust on the needle
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 #34274)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
On which of the following factor does the viscosity of a liquid depend? i. Nature of the liquid. ii. Temperature of the liquid. iii. Area of the liquid surface
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The viscosity of a liquid depends on:
* Nature of the liquid: Different liquids have varying viscosities.
* Temperature of the liquid: Higher temperatures generally reduce viscosity.
The area of the liquid surface does not affect viscosity, it is an intrinsic property of the liquid.
Source: Myschool Past Questions Archive (Record #34275)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string
A
64.0J
B
80.0J
C
128.0J
D
160.0J
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = \(\frac{1}{2}Ke^2\)
= \(\frac{1}{2} \times 200(0.8)^2 = 64J\)
Source: Myschool Past Questions Archive (Record #34276)
Physics
WAEC / WASSCE 2004
Work, Energy, Power & Simple Machines
Solution
A machine of velocity ratio 5 is used in lifting a load with an effort of 500N. If the machine is 80% efficient. Determine the magnitude of load
A
2500N
B
2000N
C
900N
D
625N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
M.A = \(\frac{Eff \times V.r}{100} = \frac{80 \times 5}{100} = 4\)
Load = effort x M.A
= 4 x 500 = 2000N
Source: Myschool Past Questions Archive (Record #34277)
Physics
WAEC / WASSCE 2004
Linear Motion, Projectiles & Kinematics
The speed of an object in rectilinear motion can be determine from the
A
area under a velocity-time graph
B
area under a distance-time graph
C
slope of a distance-time graph
D
slope of a velocity-time graph
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 #34278)
Physics
WAEC / WASSCE 2004
Equilibrium of Forces, Moments & Flotation
Solution
Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm-3, density of ice = 0.9cm-3]
A
0.00cm3
B
9.00cm3
C
10.00cm3
D
90.00cm3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\Delta\)y = Vice - Vwater
= \(\frac{90}{0.9} - \frac{90}{1} = 10cm^3\)
Source: Myschool Past Questions Archive (Record #34269)
Physics
WAEC / WASSCE 2004
Waves, Sound & Vibrations
Diagram
The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave
Attached Figure / Diagram
A
20 Hz
B
10 Hz
C
5 Hz
D
4 Hz
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 #34270)
Physics
WAEC / WASSCE 2004
Waves, Sound & Vibrations
Which of the following concept is not an evidence of the particle nature of matter?
A
diffusion
B
brownian motion
C
diffraction
D
crystallization
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 #34272)
Physics
WAEC / WASSCE 2004
Elasticity, Density, Pressure & Fluids
Solution
A diver is 5.2m below the surface of water of density 1000Kgm-3. If the atmospheric pressure is 1.02 x 105pa. Calculate the pressure on the diver [g = 10ms-2]
A
6.20 x 104 pa
B
1.02 x 105 pa
C
1.54 x 105 pa
D
5.20 x 105 pa
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = hpg + A.P
= 5.2 x 1000 x 10 + 1.02 x 105
= 1.54 x 105
Source: Myschool Past Questions Archive (Record #34273)
Physics
WAEC / WASSCE 2004
Linear Motion, Projectiles & Kinematics
A body is said to be moving with uniform acceleration if it experiences equal
A
increase in velocity at equal time intervals
B
decreases in velocity at equal time intervals
C
increases in speed at equal time intervals
D
decreases in speed at equal time intervals
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 #34279)
Physics
WAEC / WASSCE 2004
Linear Motion, Projectiles & Kinematics
Solution
A body is dropped from a certain height above the ground level, falls with uniform
A
speed
B
velocity
C
acceleration
D
retardation
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
For an object falling from a height, the acceleration is constant and is equal to g. This uniform acceleration is produced due to the gravitational force and is known as acceleration due to gravity.
Source: Myschool Past Questions Archive (Record #34280)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
A body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force
A
240N
B
96N
C
20N
D
9N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = ma = \(\frac{mv}{t} = \frac{8 \times 30}{2.5} = 96\)
Source: Myschool Past Questions Archive (Record #34281)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
A force acting on a body causes a change in the momentum of the body from 12kg ms-1 to 16kg ms-1 in 0.2s. calculate the magnitude of the force
A
140.0N
B
20.0N
C
4.0N
D
0.8N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{mv - mu}{t} = \frac{16 - 12}{0.2} = 20N\)
Source: Myschool Past Questions Archive (Record #34282)
Physics
WAEC / WASSCE 2004
Current Electricity & Electric Circuits
Solution
The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms-2]
A
0.02N
B
0.20N
C
20.00N
D
200.00N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Wt = mg = 0.02 x 10 = 0.2N
Source: Myschool Past Questions Archive (Record #34283)