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 13891–13905 of 14893 verified questions
Sort by:
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Solution
A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is
A
0.5\(\Omega\)
B
1\(\Omega\)
C
2\(\Omega\)
D
2.5\(\Omega\)
E
3\(\Omega\)
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
1 = \(\frac{E}{R + r}\)
\(\frac{2}{R + 1}\) = 0.5
0.5R = 2 - 0.5 = 1.5
R = \(\frac{1.5}{0.5}\)
= 3\(\Omega\)
Source: Myschool Past Questions Archive (Record #28992)
Physics
UTME / JAMB 1981
Scalars, Vectors & Relative Motion
Solution
An example of a scalar quantity is
A
velocity
B
weight
C
electric charge
D
acceleration due to gravity
E
momentum
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Scalar quantities have only magnitude and no direction. The other options (velocity, weight, acceleration due to gravity, and momentum) are vector quantities because they have both magnitude and direction.
Source: Myschool Past Questions Archive (Record #28993)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Heat was supplied to a block of ice at 0oC until half of it melted. Which of the following statements is true?
A
the temperature rises and the ice expand
B
the temperature remains constant and the volume of the ice decreases
C
the ice gives out heat as it melts and the temperature decreases
D
the mass remains constant and the temperature increases
E
the temperature decreases because some heat is lost
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 #28995)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
When a ray of light passes from water to glass, it is
A
bent away from the normal
B
bent towards the normal
C
totally internally reflected
D
absorbed by the glass
E
broken into a pure spectrum
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 #28997)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Solution
The resistance of a 240V, 60 watt electric filament bulb is
A
0.25\(\Omega\)
B
480\(\Omega\)
C
60\(\Omega\)
D
240\(\Omega\)
E
960\(\Omega\)
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
power = IV
power = \(\frac{V^2}{R}\) = 60
= \(\frac{240^2}{R}\)
= 960\(\Omega\)
Source: Myschool Past Questions Archive (Record #29000)
Physics
UTME / JAMB 1981
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Which type of radiation does not NOT originate within the nucleus?
A
alpha
B
beta
C
gamma
D
neutron
E
x-rays
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
x rays are emitted from processes outside the nucleus
Source: Myschool Past Questions Archive (Record #29014)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
The resistance of an open series circuit is
A
zero
B
half the normal resistance of the circuit
C
double the normal resistance of the circuit
D
one
E
infinite
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 #29016)
Physics
UTME / JAMB 1981
Lenses & Optical Instruments
The lack of power of accommodation which is mainly due to the hardening of the eye lens and is usual with onset of old age is called?
A
myopia
B
hypermyopia
C
presbyopia
D
astigmatism
E
eye ring
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 #29017)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Solution
A body falls freely under gravity (g = 9.8ms-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is
A
784ms-1
B
80ms-1
C
78.4ms-1
D
39.2ms-1
E
27.7ms-1
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
The total distance fallen is s = 40m - 0.8m = 39.2m
u = 0m/s, v = ? , g = 9.8m/s\(^2\)
Using: v\(^2\) = u\(^2\) + 2gs
v\(^2\) = 0 + 2 x 9.8 x 39.2
v\(^2\) = 768.32
v = \(\sqrt{768.32}\) ≈ 27.7m/s.
Source: Myschool Past Questions Archive (Record #29018)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Solution
An aircraft travelled from calabar to kano as follows: it flew first to ilorin convering a distance of 300km, 30o west of North, and then flew 400km, 60o East of North to kano. What is the resultant displacement?
A
567km
B
410km
C
594km
D
500km
E
600km
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
R2 = 3002 + 4002
R2 = 90000 + 160000
R = \(\sqrt{250000}\)
= 500km
Source: Myschool Past Questions Archive (Record #29006)
Physics
UTME / JAMB 1981
Waves, Sound & Vibrations
Solution
All of the following frequencies are overtones of 320 Hz EXCEPT
A
960Hz
B
640Hz
C
520Hz
D
1280Hz
E
1600Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Overtones are frequency which are multiples of fundamental frequency
Fundamental frequency - f1 = 320Hz
Overtones 320 x 3 = 640Hz
320 x 3 = 960HZ
320 x 4 = 1280Hz
320 X 5 = 1600hZ
Source: Myschool Past Questions Archive (Record #29009)
Physics
UTME / JAMB 1981
Reflection, Refraction & Dispersion of Light
Solution
The absolute refractive indices of glass and water are \(\frac{3}{2}\) and \(\frac{4}{3}\) respectively. The refractive index at the interface when a ray travels from water to glass is
A
\(\frac{1}{2}\)
B
\(\frac{8}{9}\)
C
\(\frac{9}{8}\)
D
\(\frac{17}{12}\)
E
2
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Ray travelling from water to glass;
\(\frac{\text{speed of light in air}}{\text{speed of light in glass}}\) = \(\frac{3}{2}\)
= 3 x 108ms-1
X = 2 x 108ms-1
\(\frac{\text{speed of light in air}}{\text{speed of light in water}}\) = \(\frac{4}{3}\)
= \(\frac{3 \times 10^8}{g}\)
Y = 2.25 x 108ms-1
from water to glass;
Refractive = \(\frac{\text{speed of light in water}}{\text{speed of light in glass}}\)
= \(\frac{2.25 \times 10^8}{2.00 \times 10^8}\)
= 1.125
= \(\frac{9}{8}\)
Source: Myschool Past Questions Archive (Record #29012)
Physics
UTME / JAMB 1981
Scalars, Vectors & Relative Motion
Which of the following statements is CORRECT?
A
charges generated on glass rubbed with silk are called negative
B
charges in various media can be carried by protons detached from their atom
C
the magnitude of any charge is a multiple of the charge of an electron
D
the intensity of an electric field is a scalar quantity
E
if 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V
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 #29013)
Physics
UTME / JAMB 1981
Magnetism, Electromagnetism & AC Circuits
Solution
Alternating current can induce voltage because it has a
A
ripple value
B
varying magnetic field
C
weaker magnetic field than direct current
D
stonger magnetic field than direct current
E
high peak value
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Due to the change in the voltage in an AC, which either increases or decreases, the magnetic field around it is alwats eithercollapsing or expanding (varying magnetic field).
Source: Myschool Past Questions Archive (Record #29019)
Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Solution
Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is
A
\(\frac{1}{2}\)
B
\(\frac{2}{\sqrt2}\)
C
\(\frac{1}{\sqrt2}\)
D
\(\sqrt 2\)
E
4
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given \( a_X = 2a_Y \) and both start from rest covering the same distance \( s \):
For X:
\(s = a_Y t_X^2\)
For Y:
\(s = \frac{1}{2} a_Y t_Y^2\)
Setting them equal:
\(a_Y t_X^2 = \frac{1}{2} a_Y t_Y^2 \implies t_X^2 = \frac{1}{2} t_Y^2\)
Thus: \(\frac{t_X}{t_Y} = \frac{1}{\sqrt{2}} \quad \Rightarrow \quad \frac{1}{\sqrt{2}}\)
Source: Myschool Past Questions Archive (Record #29021)