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Physics
UTME / JAMB 1986
Magnetism, Electromagnetism & AC Circuits
Which of the following is NOT a part of a d.c. electric motor?
A
Field-magnet
B
Armature
C
Commutator
D
Transformer
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 #28540)
Physics
UTME / JAMB 1986
Current Electricity & Electric Circuits
Which of the following is stored by a dry Leclanche cell?
A
Electrical power
B
Kinetic energy
C
Electric current
D
Chemical energy
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 #28541)
Physics
UTME / JAMB 1986
Current Electricity & Electric Circuits
Solution
Which of the following is true of magnetism?
A
Iron fillings cling mainly round the ends of a bar magnet
B
The freely suspended bar magnet comes to rest in the geographic north-south direction
C
Like poles attract
D
Iodestone is a non-magnetic oxide
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Iron filings cling mainly round the ends of a bar magnet
Source: Myschool Past Questions Archive (Record #28542)
Physics
UTME / JAMB 1986
Magnetism, Electromagnetism & AC Circuits
The angle between the magnetic meridian and the geographic meridian at a locality on the earth is the
A
longitude of the locality
B
angle of inclination at the locality
C
latitude of the locality
D
angle of declination of the locality
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 #28543)
Physics
UTME / JAMB 1986
Electrostatics & Capacitors
The sign of the change on a charged glass rod may be determined with
A
a charged electroscope
B
an uncharged electroscope
C
a galvanometer
D
an electrometer
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 #28544)
Physics
UTME / JAMB 1986
Magnetism, Electromagnetism & AC Circuits
If the inclination at Ibadan is 7oS, this means that
A
the angle between the geographic meridian and the magnetic meridian at Ibadan is 7o
B
the earth's magnetic intensity at Ibadan makes angle 7o with the horizontal direction
C
a magnetic needle will be inclined at 7o to the vertical at Ibadan
D
the north pole of a magnetic needle dips downward at Ibadan
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 #28545)
Physics
UTME / JAMB 1986
Gas Laws & Heat Transfer
Solution
The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 10\(^8\)ms\(^{-1}\), then the frequency of the ultraviolet radiation is
A
1.3 x 1015Hz
B
7.5 x 105Hz
C
1.2 x 1011Hz
D
7.5 x 1014Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{V}{\lambda}\)
= \(\frac{3 \times 10^8}{400 \times 10^{-9}}\)
= 0.75 x 10\(^{15}\)Hz
= 7.5 x 10\(^{14}\) Hz
Source: Myschool Past Questions Archive (Record #28546)
Physics
UTME / JAMB 1986
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Which of the following is most strongly deflected by magnetic field?
A
\(\gamma\) - rays
B
X- particle
C
\(\beta\) - particles
D
X - rays
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Beta particles have a negative charge (for electrons) or a positive charge (for positrons). When beta particles enter a magnetic field, they experience a force due to their charge, which causes them to curve in a direction determined by the right-hand rule (for negative charges) or left-hand rule (for positive charges). This results in significant deflection.
Source: Myschool Past Questions Archive (Record #28547)
Physics
UTME / JAMB 1986
Elasticity, Density, Pressure & Fluids
fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the
A
slope of the linear prtion of the graph
B
length of the linear portion of the graph
C
area under the linear portion of the graph
D
area under the entire graph
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: Official Exam / Past Question Archive
Physics
UTME / JAMB 1986
Newton's Laws, Momentum & Collisions
When a box of mass 45kg, is given an initial speed of 5ms-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms-2)
A
\( \frac{5}{6} \)
B
\( \frac{5}{12} \)
C
\( \frac{1}{3} \)
D
\( \frac{2}{3} \)
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 #41565)
Physics
UTME / JAMB 1986
Current Electricity & Electric Circuits
Diagram
Solution
In fig 9 the value of R is
Attached Figure / Diagram
A
3Ω
B
4Ω
C
5Ω
D
6Ω
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From Ohm's law, V = IR
But R = total resistance of the circuit.
12 = 2( 3 + \(R_{parallel}\))
12 = 2(3 + \(\frac{6R}{6 + R}\))
6 = \(\frac{18 + 3R + 6R}{6 + R}\)
36 + 6R = 18 + 9R
9R - 6R = 36 - 18
3R = 18
R = \(\frac{18}{3}\) = 6 \(\Omega\)
Source: Myschool Past Questions Archive (Record #41650)
Physics
UTME / JAMB 1986
Current Electricity & Electric Circuits
Diagram
if the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is
Attached Figure / Diagram
A
0.3A
B
0.8A
C
1.0A
D
1.8A
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 #41651)
Physics
UTME / JAMB 1986
Reflection, Refraction & Dispersion of Light
Diagram
Solution
In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted ray, what is the refractive index of the glass
Attached Figure / Diagram
A
1.73
B
1.50
C
0.87
D
0.57
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
From the diagram above:
refractive index \(_gn_a\) = \(\frac{1}{_an_g}\) = \(\frac{sin r}{sin i}\) = \(\frac{ sin 30}{ sin 60}\) = \(\frac{1}{0.577}\) = 1.732
Source: Myschool Past Questions Archive (Record #41653)
Physics
UTME / JAMB 1986
Calorimetry, Latent Heat & Change of State
Diagram
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature \( 80^{\circ}C \) is known as
Attached Figure / Diagram
A
cooling temperature
B
boiling point
C
melting point
D
vaporization point
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 #41654)
Physics
UTME / JAMB 1986
Current Electricity & Electric Circuits
Diagram
In fig 3, three forces F1, F2, and F3 acting at O are in equilibrium. If the magnitude of F1 is 10N,and the magnitude of F2 is 5N, find the magnitude of F3
Attached Figure / Diagram
A
26.4N
B
15.0N
C
13.2N
D
10.0N
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 #41656)