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Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Solution
A particle moves in a circular orbit of radius 0.02m. If the speed of the particle is 0.88ms-1, calculate its frequency in cycles per second
A
2.0Hz
B
7.0Hz
C
8.8Hz
D
14.0Hz
E
17.6Hz
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
W = \(\frac{v}{r}\)
= \(\frac{0.88}{0.02}\) = 44 rad/s
2\(\pi\)F = W = 44
F = \(\frac{44}{2 \times 3.142}\)
= 7Hz
Source: Myschool Past Questions Archive (Record #28709)
Physics
UTME / JAMB 1984
Calorimetry, Latent Heat & Change of State
Solution
Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5oC, then the specific heat capacity of the liquid is
A
2.0 x 102Jkg-1k-1
B
2.0 x 102Jkg-1
C
4.0 x 104Jkg-1k-1
D
4.0 x 104kg-1
E
8.4 x 103Jkg-1k-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat energy = Electrical energy
mc\(\theta\) = power x time
5 x 1 x 10-2 x C = 100 x 20
C = 4.0 x 104Jkg-1k-1
Source: Myschool Past Questions Archive (Record #28714)
Physics
UTME / JAMB 1984
Gas Laws & Heat Transfer
Solution
A given mass of an ideal gas occupies a volume V at a temperature T and under a pressure p. If the pressure is increased to 2p and the temperature reduced to \(\frac{1}{2T}\), then the percentage change in the volume of the gas is
A
0%
B
25%
C
75%
D
300%
E
400%
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{P_2V_2}{T_2}\) = \(\frac{P_1V_1}{T_1}\)
P2 = 2P1
T1 = 2T2
\(\frac{2P_1V_2}{T_2}\) = \(\frac{P_1V_1}{2T_1}\)
Change in volume = \(V_2 - V_1\)
% change = \(\frac{V_1 - \frac{1}{4}V_1}{V_1}\) X 100%
= 75%
Source: Myschool Past Questions Archive (Record #28715)
Physics
UTME / JAMB 1984
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following properties of matter CANNOT be utilized for temperature measurement? The
A
length of a liquid column
B
volume of a gas at constant pressure
C
pressure of a gas at constant volume
D
resistance of a metallic wire
E
current produced in a photoelectric effect
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 #28717)
Physics
UTME / JAMB 1984
Lenses & Optical Instruments
Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length
A
i only
B
ii only
C
iii only
D
i and iii
E
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 #28720)
Physics
UTME / JAMB 1984
Reflection, Refraction & Dispersion of Light
Solution
A coin is placed at the bottom of a cube of glass t cm thick. If the refractive index of the glass is \(\mu\), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?
A
\(\frac{1}{t - \mu}\)
B
\(\frac{t(\mu - I)}{\mu}\)
C
t (1 + \(\frac{1}{\mu}\))
D
-\(\mu\)
E
\(\mu\)t
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Let apparent depth = x
\(\mu\) = \(\frac{t}{x}\) ⇒ x = \(\frac{t}{u}\)
Apparent displacement of coin: s = real depth - apparent depth, s = t - x = t - \(\frac{t}{u}\)
s = \(\frac{\mu t - t}{\mu}\) = \(\frac{t(\mu - 1)}{\mu}\)
Source: Myschool Past Questions Archive (Record #28721)
Physics
UTME / JAMB 1984
Magnetism, Electromagnetism & AC Circuits
Solution
The electromotive force obtained from a simple dynamo may be increased by
A
increasing the cross-sectional area of the coil
B
winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
C
increasing the speed of rotation
D
making the field magnet longer
E
using low-resistance copper coils
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Increasing the rotation speed enhances the electromotive force (EMF) generated due to Faraday's law of electromagnetic induction.
Source: Myschool Past Questions Archive (Record #28723)
Physics
UTME / JAMB 1984
Newton's Laws, Momentum & Collisions
Solution
A gun of mass 2.0kg fires a bullet of mass 16 x 10 -2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms-1, what is the recoil velocity of the gun?
A
150ms-1 due West
B
1.2 x 10-4ms-1 due West
C
1.2ms-1 due West
D
1.2ms-1 due East
E
150ms-1 due East
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Gun momentum = bullet momentum
2 x v = 1.6 x 10-2 x 150
v = 1.2ms-1 in opposite direction
Source: Myschool Past Questions Archive (Record #28727)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Which of the following is a correct explanation of the inertia of a body?
A
ability to overcome the earth's gravity
B
reluctance to stop moving
C
readiness to start moving
D
reluctance to start moving and its readiness to stop moving once it has begun to move
E
reluctance to start moving its reluctance to stop moving once it has begun to move
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 #28729)
Physics
UTME / JAMB 1984
Work, Energy, Power & Simple Machines
Solution
If a water pump at Kainji Dam is capable of lifting 1000kg of water through a vertical height of 10m in 10s, the power of the pump is [g = 10ms-2]
A
1.0kW
B
10.0kW
C
12.5kW
D
15.0kW
E
20.0kW
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
power = \(\frac{\text{work done}}{time}\)
= \(\frac{1000 \times 10 \times 10}{10}\)
= 10kW
Source: Myschool Past Questions Archive (Record #28730)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Solution
What is the apparent colour of a RED SHIRT when viewed in PURE green light?
A
Red
B
Green
C
Yellow
D
Black
E
Blue
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
When green light is shone on a red object, it absorbs all of the green light and not reflecting anything. Hence, it appears black.
Source: Myschool Past Questions Archive (Record #28731)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
The spectrum of white light consists of coloured lights arranged in the following order
A
blue, red, green, yellow, indigo, violet, orange
B
red, orange, yellow, green, blue, indigo, violet
C
red, orange, yellow, indigo, green, blue, violet
D
indigo, green, blue, violet, yellow, red, orange
E
yellow, blue, green, violet, orange, indigo, red
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 #28732)
Physics
UTME / JAMB 1984
Atomic, Quantum, Nuclear Physics & Electronics
Cathode rays are
A
high-energy electromagnetic waves
B
protons
C
streams of electrons
D
neutrons
E
radio waves
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 #28733)
Physics
UTME / JAMB 1984
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following i. \(\beta\)-particles ii. protons iii. neutrons iv. \(\alpha\)-particles. may be found in light nuclei?
A
i and ii
B
i and iii
C
ii and iv
D
ii and iii
E
i, ii and iii
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 #28737)
Physics
UTME / JAMB 1984
Waves, Sound & Vibrations
Solution
Radio waves have a velocity of 3 x 108ms-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is
A
375.0m
B
267.0m
C
240.0m
D
37.5m
E
26.7m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
v = F\(\lambda\)
3 x 108 = \(\lambda\) x 800 x 103
\(\lambda\) = 375.0m
Source: Myschool Past Questions Archive (Record #28738)