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Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Which of the following is not a consequence of a force field?
A
wieght
B
surface tension
C
gravitational pull
D
magnetic force
E
electric force
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 #23853)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?
A
2√3 N
B
4 N
C
4√3 N
D
8 N
E
2 N
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = 4 x sin 60o
F = 4 x √3/2 = 2√3 N
Source: Myschool Past Questions Archive (Record #23888)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Which of the following is used to determine the relative density of the acid in a car battery?
A
Hypsometer
B
Hygrometer
C
Manometer
D
Hydrometer
E
Spectrometer
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 #23889)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).
A
8g
B
25g
C
30g
D
40g
E
50g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
W = pvg = (2.5 x 10 x 60)/100 = 0.500N.
Upthrust = wt of liquid displaced = pvg water.
pvg water = (1x20x10)/2 = 0.10N
Reading => 0.500N - 0.100N = 0.4N = 40g
Source: Myschool Past Questions Archive (Record #23890)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
A piece of cork floating on water is acted upon by the forces of...
A
Weight and viscosity
B
weight and upthrust
C
upthrust and viscosity
D
weight only
E
upthrust only
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 #23891)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?
A
16.0 ms-1
B
8.0 ms-1
C
6.0 ms-1
D
2.0 ms-1
E
0.5 ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = wr = 2x4 = 8.0 ms-1
Source: Myschool Past Questions Archive (Record #23892)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
A
120,000 W
B
30,000 W
C
333 W
D
300 W
E
30 W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = mgh/t = (1000 \(\times\) 10 \(\times\) 60) \(\div\) 20 = 30,000 W.
Source: Myschool Past Questions Archive (Record #23895)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Which of the following surfaces will radiate heat energy best?
A
Red
B
White
C
Black
D
Yellow
E
Blue
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 #23900)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
A
relative humidity is higher than at sea-level
B
rays of the sun adds more heat to the water
C
temperature is lower than that at sea-level
D
pressure is lower than that at sea-level
E
pressure is more than that at sea-level
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Refer to Elementary physics, pressure reduces with height.
Source: Myschool Past Questions Archive (Record #23910)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).
A
533000J
B
230000J
C
117200J
D
113000J
E
4200J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
Source: Myschool Past Questions Archive (Record #23912)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
All the heat generated by a current of 2A passing through a resistor of 6\Omega for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
A
60 Jg-1
B
120 Jg-1
C
300 Jg-1
D
360 Jg-1
E
1500 Jg-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Electrical Energy = Heat Energy.
I2Rt = ml
22 x 6 x 25 = 5 x L.
L = 120 Jg-1.
Source: Myschool Past Questions Archive (Record #23914)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.
A
3
B
6
C
150
D
300
E
600
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
λ = 2 x 50 = 100cm = 1m.
V = fλ, f = v/λ = 300.
Source: Myschool Past Questions Archive (Record #23924)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms-2 and the radius of the earth is 6 x 106m.
A
7.8 x 106ms-12
B
1.1 x 104ms-1
C
3.5 x 107ms-1
D
6.0 x 107 ms-1
E
1.2 x 108ms2-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Hint: V = √2gr = √(2x10x6x106) + 1.1 x 104ms-1
Source: Myschool Past Questions Archive (Record #23927)
Physics
WAEC / WASSCE 1989
Mechanics and Properties of Matter
Solution
The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:
A
q2/4πεr
B
rε0/q2
C
4πq/ε0
D
qr2/ε0
E
\(\frac{q^2}{4\piεor^2}\)
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
According to Coulomb's law, the Force between two point charges \(Q_1\) and \(Q_2\) is equal to
F = \(\frac{Q_1 Q_2}{4\pi εor^2}\)
Source: Myschool Past Questions Archive (Record #23928)
Physics
UTME / JAMB 1989
Mechanics and Properties of Matter
Solution
The magnitude of the resultant of two mutually perpendicular forces, F1 and F2 is 13N, if the magnitude of F1 is 5N, what is the magnitude of F2?
A
2.6N
B
6.0N
C
12.0N
D
18.0N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
(13)2 = 52 + (F2)2
F2 = 12N
Source: Myschool Past Questions Archive (Record #28307)