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 20506–20520 of 29821 verified questions
Sort by:
Physics
UTME / JAMB 1998
Electrostatics & Capacitors
Solution
A parallel plate capacitor has a common plate area of 5 x 10\(^{-8}\)m2 and plate separation of 2 x 10\(^{-3}\)m, Assuming free space,
What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-\(^{-12}\)C2N-1m-2]
A
2.25 x 10-17F
B
4.50 x 10-17F
C
2.25 x 10-16F
D
4.50 x 10-16F
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
C = \(\frac{{\varepsilon}_oA}{d}\)
= \(\frac{5{\times} 10^{-8} {\times} 10^{-12}{\times} 9}{2 {\times}10^{-3}}\)
= 2.25 x \(10^{-16}\)F
Source: Myschool Past Questions Archive (Record #27664)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
The iron core of an induction coil is made from bundles of wire so as to
A
minimize eddy-currents
B
generate eddy-current
C
prevent sparking at the contact breaker
D
get the greatest posible secondary voltage
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 #27665)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
Solution
Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is
A
3.6 x 103J
B
5.0 x 103J
C
3.0 x 105J
D
1.8 x 107J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Elect. energy = I2Rt
= 100 x 100 x 0.5 x 3600
= 1.8 x 107J
Source: Myschool Past Questions Archive (Record #27666)
Physics
UTME / JAMB 1998
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.
A
0.625A
B
1.600A
C
2.500A
D
6.250A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Efficiency = \(\frac{I_sV_s}{I_pV_p}\) x 100
Source: Myschool Past Questions Archive (Record #27667)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
Solution
The electrochemical equivalent of a metal is 1.3 x 10-7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
A
6.5 x 10-2kg
B
2.6 x 10-2kg
C
6.5 x 10-3kg
D
2.6 x 10-3kg
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
m = QZ
= 2 x 104 x 1.3 x 10-7
= 2.6 x 10-3kg
Source: Myschool Past Questions Archive (Record #27672)
Physics
UTME / JAMB 1998
Atomic, Quantum, Nuclear Physics & Electronics
Solution
In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10-6kg. The amount of energy obtained from the fusion is
A
3.0 x 10-4J
B
3.0 x 10-1J
C
9.0 x 104J
D
9.0 x 1010J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Energy = mc2
= 1 x (3 x 108)2 x 106
= 9 x 1010J
Source: Myschool Past Questions Archive (Record #27675)
Physics
WAEC / WASSCE 1998
Electrostatics & Capacitors
Solution
which of the following pairs of physical quantities comprises vectors?
A
capacitance and inductance
B
force ratio and velocity ratio
C
friction and momentum
D
energy and power
E
electric field potential and electric field intensity
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Friction and Momentum both have magnitudes and directions.
Source: Myschool Past Questions Archive (Record #33484)
Physics
WAEC / WASSCE 1998
Circular Motion, Gravitation & Simple Harmonic Motion
A piece of stone attached to one end pf string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will
A
move towards te centre of the circle
B
stop moving immediately
C
move along a circular path of smaller radius
D
fly off in a direction tangential to the circular path
E
acquire greater centripetal force
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 #33494)
Physics
WAEC / WASSCE 1998
Equilibrium of Forces, Moments & Flotation
The term torque means
A
the moment
B
the resultant of several forces acting on a body in equilibrum
C
two equal and oposite forces whose lines of action do not coincide
D
two coplaner forces at right angles to each other
E
the equilibrant of two concurrent forces
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 #33502)
Physics
WAEC / WASSCE 1998
Equilibrium of Forces, Moments & Flotation
Solution
A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid
A
1.43
B
1.33
C
1.00
D
0.83
E
0.75
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
from the first statement, mg = \(\frac{2}{3}Vp_wg\) ........................1
from second statement, mg = \(\frac{1}{2}Vp_lg \)...................2
equating equations 1 and 2 we have that
\(\frac{2}{3}Vp_wg\) = \(\frac{1}{2}Vp_lg\)
\(\frac{4}{3} = \frac{p_l}{p_w}\)
= 1.33
Source: Myschool Past Questions Archive (Record #33507)
Physics
WAEC / WASSCE 1998
Current Electricity & Electric Circuits
Solution
The earth is not a perfect sphere because its equatorial axis is longer than the polar axis. where on the earth's surface would an object have its greatest weight?
A
half way between the equator and the north pole
B
near the equator
C
half way between the equator and the south pole
D
at either pole
E
at the equator
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The acceleration due to gravity is maximum at the poles and minimum at the equator, therefore the weight of the object will be maximum at the poles.
Source: Myschool Past Questions Archive (Record #33542)
Physics
WAEC / WASSCE 1998
Newton's Laws, Momentum & Collisions
Solution
A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m-1 and rebounds with the same speed. Determine the impulse experienced by the ball
A
20.0kgm-1
B
5.0kgm-1
C
1.3kgm-1
D
0.0kgm-1
E
10.0kgm-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Using: \(\text{Impulse} = \Delta \text{Momentum} = m(v - u)\)
Initial Momentum: \(5\text{ kg} \times 2\text{ m/s} = +10\text{ kg m/s}\)
Final Momentum: \(5\text{ kg} \times (-2\text{ m/s}) = -10\text{ kg m/s}\)
Change: \(-10 - 10 = -20\text{ kg m/s}\)
Source: Myschool Past Questions Archive (Record #33543)
Physics
WAEC / WASSCE 1998
Temperature, Thermometry & Thermal Expansion
Solution
The lower and upper fixed points of a mecury-in-glass thermometer are marked Y and 180mm respectively. On a particular the mecury meniscus in the thermometer rises to 45mm. If the corresponding reading on a scale is 10o, calculate the value of Y.
A
4mm
B
18mm
C
30mm
D
135mm
E
450mm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
by interpolation,
\(\frac{100 - 0}{10- 0} = \frac{180 - y}{45 - y}\)
\(\frac{100}{10} = \frac{180 -y}{45 - y }\)
450 - 10y = 180 - y
- 9y = - 270
y = 30mm
Source: Myschool Past Questions Archive (Record #33552)
Physics
WAEC / WASSCE 1998
Temperature, Thermometry & Thermal Expansion
Solution
A piece of brass of mass 170kg has its temperature raised from 0ºC to 30ºC. Calculate its increase in volume, given the density of brass at 0 ^\circC as 8.5 x 103kgm\(^3\) and its cubic expansivity as 5.7 x 10\(^{-5}\)k\(^{-1}\)
A
3.4 x 10-4m3
B
4.3 x 10-5m3
C
3.4 x 10-5m3
D
3.4 x 10-3m3
E
3.4 x 10-2m3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V = \(\frac{m}{p}= \frac{170}{8.5 x 10^{-3}}\) = 0.02
= \(\Delta\)\(\frac{\delta V}{V \delta T}\)
\(\delta V\) = \(\Delta\) x V x \(\delta\)T
= 5.7 x \(10^{-5}\) x 0.02 x 30
= 3.42 x \(10^{-5}\)
Source: Myschool Past Questions Archive (Record #33555)
Physics
WAEC / WASSCE 1998
Work, Energy, Power & Simple Machines
Solution
The average kinetic energy of the molecules of a perfect gas is directly proportional to the
A
pressure exerted by the gas
B
volume of the gas molecule
C
kelvin temperature of the gas
D
volume of the gas container
E
celcius temperature of the gas
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The average kinetic energy of the molecules of a perfect gas is directly proportional to the Absolute temperature that is the temperature measured using the kelvin scale.
Source: Myschool Past Questions Archive (Record #33559)