Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 24631–24645 of 29821 verified questions
Sort by:
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Solution
Two forces, whose resultant is 100N are perpendicular to each other. If one of them makes an angle of 60o with the resultant, calculate the magnitude. (Sin 60o = 0.8660, Cos 60o = 0.500)
A
200.0N
B
173.2N
C
115.5N
D
86.6N
E
50.0N
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
x = 100 cos50o = 50N
Source: Myschool Past Questions Archive (Record #33364)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Diagram
The graph above shows the expansion of water as the temperature increases from 0oC. Which of the following deductions from the graph are true? i. Water has its maximum density at Q. ii. The volume of water is greater at 0oC than at 4oC. iii. The volume of water decreases uniformly when cooled from 100oC. iv. When water solidifies, its volume increases
Attached Figure / Diagram
A
i and ii only
B
i and iii only
C
ii and iii only
D
i, ii and iii only
E
i, ii and iv only
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 #33367)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Diagram
Two mirrors are inclined as shown in the diagram. A ray of light RO strikes the arrangement at O and emerges along PO. The emergent ray has been deviated through
Attached Figure / Diagram
A
240o
B
180o
C
120o
D
60o
E
30o
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 #33396)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Diagram
In the arrangement illustrated above, Y and B are yellow and blue transparent light filters respectively through the filters is
Attached Figure / Diagram
A
blue
B
red
C
yellow
D
green
E
black
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 #33397)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?
A
the pressue is reduced
B
the sound waves are pumped out
C
the waves are absorbed in the inner walls
D
There is no more material medium
E
the air is disturbed
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 #33414)
Physics
WAEC / WASSCE 1991
Waves, Sound & Vibrations
Diagram
Which of the following statements is true of the diagram shown above?
Attached Figure / Diagram
A
the two point, A and B are in phase
B
distance AB is halgf the wavelength of the wave
C
AC and BD are the amplitude of the wave
D
the two points A and B represents the wave crests
E
the wave has four crests
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 #33415)
Physics
WAEC / WASSCE 1991
Waves, Sound & Vibrations
Solution
A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air
A
540.0ms-1
B
333.3ms-1
C
270.0ms-1
D
166.7ms-1
E
83.3ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V = \(\frac{2x}{t} = \frac{2 \times 300}{1.8}\)
= 333.33ms-1
Source: Myschool Past Questions Archive (Record #33416)
Physics
WAEC / WASSCE 1991
Waves, Sound & Vibrations
In which of the following is a stationary wave produced? i. A vibrating turning fork held near the end of a resonance tube closed at one end. ii. A string tightly stretched between two points and plucked at its middle. iii. The tuning fork vibrating in air
A
i only
B
ii only
C
i and ii only
D
ii and iii only
E
i, ii and iii
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 #33417)
Physics
WAEC / WASSCE 1991
Magnetism, Electromagnetism & AC Circuits
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is
A
qvB
B
mqvB/m
C
mvB/q
D
O
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 #33419)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Solution
The unit of stress is
A
Nm
B
N
C
Nm-2
D
Nm2
E
Nm1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The unit of stress is Pascal (Pa), which is equivalent to Newtons per square meter (N/m²).
Source: Myschool Past Questions Archive (Record #33444)
Physics
WAEC / WASSCE 1991
Elasticity, Density, Pressure & Fluids
Which of the following statements above viscosity are correct? when a ball falls through a viscous liquid i. viscosity opposes the gravitational force on the ball. ii. viscosity opposes the upthrust on the ball. iii. viscosity is in the same direction as the upthrust on the ball. iv. as the ball falls faster the more viscous the liquid is
A
i and iii only
B
i and ii only
C
ii and iv only
D
iii and iv only
E
i, ii and iv only
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 #33445)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Which of the following statements is not correct? Isotopes of an element have
A
the same number of electric charges on the nucleus
B
the same chemical properties
C
different nucleon numbers
D
different proton numbers
E
different atomic masses
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 #33446)
Physics
WAEC / WASSCE 1991
Elasticity, Density, Pressure & Fluids
Solution
plane as 63cm of HG while a ground observer records a reading of 75cm of Hg with his barometer. assuming that the density of air is constant, calculate the height of the plane above the ground. (Take the relative densities of air and mecury as 0.00136 and 13.6 respectively
A
120m
B
138m
C
1200m
D
274m
E
120,000m
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Pressure change for air = pressure change for mercury
hpg = Hpg
h x 0.00136 x g = (75 - 63) x 13.6 x g
h \(\frac{12 \times 13.6}{0.00136}\)
= 120,000
Source: Myschool Past Questions Archive (Record #33447)
Physics
WAEC / WASSCE 1991
Magnetism, Electromagnetism & AC Circuits
Diagram
Solution
If the frequency of the e.m.f. source in the a.c. circuit illustrated above is \(\frac{500}{\pi}\)Hz. What is the reactance of the inductor?
Attached Figure / Diagram
A
450
B
0.9
C
900
D
567
E
43
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
x = 2\(\pi f L = 2\pi \times \frac{500}{\pi} \times 0.9\)
= 900\(\Omega\)
Source: Myschool Past Questions Archive (Record #33423)
Physics
WAEC / WASSCE 1991
Current Electricity & Electric Circuits
Solution
Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6 x 10-11Nm kg, calculate the gravitational attraction between them.
A
4.9 x 10-9N
B
1.3 x 10-6N
C
6.6 x 10-8N
D
6.6 x 10-6N
E
2.6 x 10-9N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{Gm_1m_2}{r^2} = \frac{6.6 \times 10^{-11} \times 80 \times 50}{0.2 \times 0.2}\)
= 6.6 x 10-6N
Source: Myschool Past Questions Archive (Record #33424)