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Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Diagram
The diagram above represents a portion of a micrometer screw 20 gauge. What is its reading?
Attached Figure / Diagram
A
3.70mm
B
3.67mm
C
3.50mm
D
3.33mm
E
3.17mm
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #24085)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Solution
A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms-2)
A
66 kg
B
55 kg
C
44 kg
D
22 kg
E
11 kg
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Reading = mg + ma = m(g + a) = 55(10 + 2)
= 660N = 66kg
Source: Myschool Past Questions Archive (Record #24086)
Physics
WAEC / WASSCE 1990
Equilibrium of Forces, Moments & Flotation
Diagram
Solution
Two forces each of 4 N act on the opposite sides of a rectangular plate as shown in the diagram above. Calculate the magnitude of g the couple acting on the plate.
Attached Figure / Diagram
A
6.4 Nm
B
3.2 Nm
C
1.6 Nm
D
0.8 Nm
E
0.0 Nm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
couple moment = F x d = 4 x 0.4 = 1.6Nm
Source: Myschool Past Questions Archive (Record #24087)
Physics
WAEC / WASSCE 1990
Work, Energy, Power & Simple Machines
Diagram
Solution
A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?
Attached Figure / Diagram
A
Fx
B
Fcosθ/x
C
Fx tanθ
D
Fx sinθ
E
Fx cosθ
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
resolving F into its components
\(F_x\) = Fcosϴ
\(F_y\) = Fsinϴ
Work done = Force x Distance = Fcosϴ \(\times\) x = Fxcosϴ
Source: Myschool Past Questions Archive (Record #24088)
Physics
WAEC / WASSCE 1990
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?
A
1/3α Vt
B
1/2α Vt
C
α Vt
D
2α Vt
E
3α Vt
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Volume expansivity(γ) = \(\frac{\text{ change in volume}}{\text{original volume x temp. change}}\)
\(\gamma = \frac{\Delta v}{V \times \Delta t}\)
But γ = 3 \alpha
\Deltav = 3 x \alpha x \Delta t
Source: Myschool Past Questions Archive (Record #24094)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Solution
Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?
A
22.5oC
B
32.4oC
C
77.0oC
D
87.0oC
E
360.0oC
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
V1/T1 = V2/T2
1.0/(273 + 27) = 120/T2
T2 = 360K = 87
Source: Myschool Past Questions Archive (Record #24095)
Physics
WAEC / WASSCE 1990
Calorimetry, Latent Heat & Change of State
Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the
A
volume of P is greater than that of Q
B
specific heat capacity of P is higher than that of Q
C
density of P is greater than that of Q
D
density of P is lower than that of Q
E
specitic heat capacity of P is lower than that of Q.
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 #24096)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Solution
lf the temperature of a small quantity of water in a closed container is gradually increased from 0o to 40oC then the density of the water within this range
A
increases for a while and then decreases
B
decreases for a while and then increases
C
increases gradually
D
decreases gradually
E
remains the same
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Water has a peculiar property. When temperature rises between 0 to 4^\circC water is not going to expand but it is going to contract. This special property is called anomalous. Therefore at 4^\circC volume of the water is minimum and the corresponding density is maximum.
Source: Myschool Past Questions Archive (Record #24097)
Physics
WAEC / WASSCE 1990
Calorimetry, Latent Heat & Change of State
Solution
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
A
1.38 x 106 J
B
2.53x104J
C
7.66x103J
D
1.38x103J
E
1.27 X103J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Q = mcΔθ = 0.050 x 460 x (85 - 25) = 1.38x103J
Source: Myschool Past Questions Archive (Record #24098)
English Language
UTME / JAMB 1990
Question Tags, Modals & Pronouns
How many solutions to the bookseller's problems are offered in this passage?
A
two
B
three
C
four
D
five
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #15034)
English Language
UTME / JAMB 1990
Question Tags, Modals & Pronouns
Of the solutions proposed for the bookseller's problems, how many are actually positive?
A
two
B
three
C
four
D
none
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #15035)
English Language
UTME / JAMB 1990
Reading Comprehension, Summary & Composition
The story of the old soldier and a book in the passage is an illustration of the point that
A
the general had already got a book
B
a book is of interest only to those to whom that book means something
C
soldiers do not like the book trade because a book is enough for a general
D
booksellers face a real dilemma because of a constantly changing clientele
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #15036)
Physics
WAEC / WASSCE 1990
Gas Laws & Heat Transfer
Heat transfer by convection in a liquid is due to the
A
translatory motion of the molecules of the liquid
B
increased vibration of the molecules of the liquid about their mean positions
C
expansion of the liquid as it is heated
D
latent heat of vaporization of the liquid
E
ability of the liquid to evaporate at all temperatures
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 #24099)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?
A
Wrapping it in cotton wool
B
painting it black
C
Placing it in a vacuum
D
Placing it on rubber supports
E
Keeping it in a closed wooden box
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 #24100)
Physics
WAEC / WASSCE 1990
Waves, Sound & Vibrations
When the direction of vibration of the particles of a medium is perpendicular to the direction of travel of a wave the wave transmitted is known as
A
sound wave
B
transverse wave
C
longitudinal wave
D
stationary wave
E
mechanical wave
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 #24101)