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Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
In the above circuit, The fuse wire melts when
A
K is Opened
B
K is closed
C
the 14 ohm resistor is doubled with k closed
D
the 6 ohm resistor is doubled with k closed
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
K is closed: This is when the current exceeds the 2 A rating of the fuse, causing it to melt.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1991
Scalars, Vectors & Relative Motion
Which of the following is a fundamental quantity?
A
speed
B
density
C
lenght
D
impulse
E
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 #33189)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
A body moves with a constant speed but has an acceleration. this process if it
A
moves in a straight line
B
moves in a circle
C
is oscillating
D
is in equilibrum
E
has a varrying acceleration
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 #33191)
Physics
WAEC / WASSCE 1991
Linear Motion, Projectiles & Kinematics
Solution
A ball is projected horizontally from the top of a hill with a velocity of 20m-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms-2)
A
20m
B
40m
C
80m
D
160m
E
200m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Initial horizontal velocity = 20ms-1
Initial vertical velocity = 0
s = ut + \(\frac{1}{2}gt^2\) = 0 x 5 x 42
= 80m
Source: Myschool Past Questions Archive (Record #33193)
Physics
WAEC / WASSCE 1991
Linear Motion, Projectiles & Kinematics
Solution
A body moving with uniform acceleration has two points(5, 15) and (20, 60) on the velocity-times graph of its motion. Calculate the acceleration of the body
A
0.25ms-2
B
3.00ms-2
C
4.00ms-2
D
9.00ms-2
E
16.00ms-2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
slope = acceleration
a = \(\frac{v_2 - v_1}{t_2 - t_1} = \frac{60- 15}{20 - 5}\)
= 3ms\(^{-2}\)
Source: Myschool Past Questions Archive (Record #33196)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Solution
A fixed mass of gas of volume 600cm3 at a temperature of 27oC is cooled at constant pressure to a temperature of 0oC. What is the change in volume?
A
54cm2
B
273cm2
C
300cm2
D
546cm2
E
600cm2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{V_1}{T_1} = \frac{V_2}{T_2}\)
T2 = 0 + 273 = 273k
V1 = 600
T1 = 27 + 273 = 300k
V2 = \(\frac{V_1T_2}{T_1}\) = 546cm
V1 - V2 = 54cm
Source: Myschool Past Questions Archive (Record #33292)
Physics
WAEC / WASSCE 1991
Calorimetry, Latent Heat & Change of State
Solution
The boiling point of a liquid depends on the following except the
A
nature of the liquid
B
external pressure
C
volume of the liquid
D
impurities present in the liquid
E
degree of it's molecular cohesive force
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The volume of the liquid does not affect the boiling point.
Source: Myschool Past Questions Archive (Record #33295)
Physics
WAEC / WASSCE 1991
Calorimetry, Latent Heat & Change of State
A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady steady state, the steam trap
A
stores the steam for future use
B
prevents the steam from escaping
C
ensures that only dry steam gets into the calorimeter
D
allows condensed steam to go into the calorimeter
E
determine the quantity of steam used
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 #33299)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Solution
a tap supplies water at 26oC while another supplies water at 82oC. If a man wishes to bathe with water at 40oC the ratio of hot mass of hot water to that of cold water required is
A
1:3
B
3:1
C
3:7
D
7:3
E
15:8
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
heat supplied by hot water = heat gained by cold water M1C(82 - 40) = M2C(40 - 26)
\(\frac{M_2}{M_1}\)= \(\frac{14}{42}\)
= 1: 3
Source: Myschool Past Questions Archive (Record #33307)
Physics
WAEC / WASSCE 1991
Calorimetry, Latent Heat & Change of State
Melting ice cools an orange drink far better than the same mass of ice-cold water because
A
melting ice is lower temperature than ice-cold water
B
water has a higher specific heat than ice
C
ice floats and cools the air above the drink
D
ice absorbs latent heat during melting
E
ice makes better thermal contact than water
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 #33312)
Physics
WAEC / WASSCE 1991
Work, Energy, Power & Simple Machines
Diagram
the diagram above shows the position of a simple pendulum set in motion. At which of the positions does the pendulum have maximum kinetic energy?
Attached Figure / Diagram
A
5
B
4
C
3
D
2
E
1
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 #33199)
Physics
WAEC / WASSCE 1991
Linear Motion, Projectiles & Kinematics
Solution
An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
A
3.0s
B
4.5s
C
6.0s
D
7.5s
E
9.0s
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
s = ut + \(\frac{1}{2}gt^2\)
45 = 0 + 5t2
t = 3s
Source: Myschool Past Questions Archive (Record #33202)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
power is defined as the
A
capacity to exert a force
B
product of force and time
C
product of force and distance
D
ability to do work
E
energy expended per unit time
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 #33204)
Physics
WAEC / WASSCE 1991
Newton's Laws, Momentum & Collisions
Solution
The product PV where P is pressure and V is volume has the same unit as
A
power
B
work
C
acceleration
D
impulse
E
force
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = \(\frac{N}{m^2}\)
V = m
PV = Nm unit of work
Source: Myschool Past Questions Archive (Record #33206)
Physics
WAEC / WASSCE 1991
Work, Energy, Power & Simple Machines
Diagram
Solution
The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W
Attached Figure / Diagram
A
300N
B
200N
C
140N
D
120N
E
20N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Eff = \(\frac{MA}{VR}\) x 100%
40 = \(\frac{MA}{60}\)
MA = 240
\(\frac{L}{E} = \frac{240}{100}\)
W = L = \(\frac{240}{100}\) x 50
= 120N
Source: Myschool Past Questions Archive (Record #33211)