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Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
The resistance of a wire depends on
A
the length of the wire
B
the diameter of the wire
C
the temperature of the wire
D
the resistivity of the wire
E
all of the above
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 #28677)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Solution
Two cells each of e.m.f. 1.5V and an internal resistance 2\(\Omega\) are connected in parallel. Calculate the current flowing when the cells are connected to a 1\(\Omega\) resistor
A
0.75\(\Omega\)
B
1.5\(\Omega\)
C
0.5\(\Omega\)
D
1.0\(\Omega\)
E
0.6\(\Omega\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = 1.5v
rT = \(\frac{2 \times 2}{2 + 2}\)
= 1
e.m.f. = I(R + r)
1.5 = I(1 + 1)
I = 0.75\(\Omega\)
Source: Myschool Past Questions Archive (Record #28679)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Which of the following components is NOT contained in a dry cell? A
A
carbon rod
B
paste of magnesium dioxide
C
paste of ammonium chloride
D
zinc case
E
copper rod
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 #28681)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Which of the following can be described as high tension transmission?
A
high resistance and low voltage
B
low current and high voltage
C
high current and low voltage
D
high voltage and zero current
E
high current and low resistance
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 #28683)
Physics
UTME / JAMB 1984
Calorimetry, Latent Heat & Change of State
Solution
All the heat generated in a 5\(\Omega\) resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
A
120J
B
60Jg-1
C
120Jg-1
D
1500J
E
1500Jg-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat energy = electrical energy
mL = I2Rt
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Source: Myschool Past Questions Archive (Record #28685)
Physics
UTME / JAMB 1984
Waves, Sound & Vibrations
When vibration occurs in air column, the distance between a node and an antinode is equal to
A
one-quarter of the wavelength
B
one-hall of the wavelength
C
the wave length
D
twice the wavelength
E
four-times the wavelength
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 #28691)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Which of the following statements is (are) NOT correct? i. pressure changes do not affect the speed of sound in air ii. the velocity of sound increases with temperature iii. the quality of the note depends only on its frequency
A
i only
B
ii only
C
iii only
D
i and iii
E
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 #28693)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Solution
One of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?
A
260Hz
B
252Hz
C
248Hz
D
264Hz
E
258Hz
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
- When a tuning fork is loaded with wax, the frequency of the tuning fork decreases, I.e when the prongs are loaded, their inertia increases, resulting in decrease of vibrational frequency.
Beat = F2 - F1
4 = 256 - F1
F1 = 252Hz
Source: Myschool Past Questions Archive (Record #28695)
Physics
UTME / JAMB 1984
Calorimetry, Latent Heat & Change of State
Solution
Dewpoint is the temperature at which, water vapour in the atmosphere
A
turns into steam
B
solidifies into ice pellets
C
first condenses into liquid form
D
is just sufficient to cause cooling
E
has a relative humidity of fifty percent
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Dew point is the temperature at which the air becomes fully saturated with water vapour. At this temperature, the water vapour in the atmosphere starts to condense into tiny liquid water droplets
Source: Myschool Past Questions Archive (Record #28696)
Physics
UTME / JAMB 1984
Temperature, Thermometry & Thermal Expansion
Solution
The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A
55.3oC
B
23.3oC
C
49.0oC
D
16.1oC
E
76.7oC
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
210mm .... 100oC
49mm .... \(\theta\)
0mm .... 0oC
\(\frac{49 - 0}{210 - 0}\) = \(\frac{\theta - 0}{100 - 0}\)
\(\frac{49}{210}\) = \(\frac{\theta}{100}\)
\(\theta\) = 23.3oC
Source: Myschool Past Questions Archive (Record #28697)
Physics
UTME / JAMB 1984
Calorimetry, Latent Heat & Change of State
If a solid changes directly into a gas when heat is applied the process is called
A
vaporization
B
evaporation
C
sublimation
D
ionization
E
conversion
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 #28698)
Physics
UTME / JAMB 1984
Work, Energy, Power & Simple Machines
Solution
A plane inclined at an angle of 30o to the horizontal has an efficiency of 60%. The force parallel to the plane required to push a load of 120N uniformly up the plane is
A
60N
B
100N
C
120N
D
200N
E
240N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V.R = \(\frac{1}{sin 30}\) = 2
Efficiency = \(\frac{m.A}{V.R}\) x 100%
60 = \(\frac{120}{effort}\) x \(\frac{1}{2}\) x 100
Effort = 100N
Source: Myschool Past Questions Archive (Record #28700)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Solution
A body of mass 5kg initially at rest is acted upon by two mutually perpendicular forces 12N and 5N as shown in fig.3. If the particle moves in the direction QA, calculate the magnitude of the acceleration
A
0.40ms-2
B
1.40ms-2
C
0.26ms-2
D
2.60ms-2
E
3.40ms-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
R = \(\sqrt{12^2 + 5^2}\)
R = 13N and R = F = ma
13 = 5 x a
= 2.60ms\(^{-2}\)
Source: Myschool Past Questions Archive (Record #28701)
Physics
UTME / JAMB 1984
Equilibrium of Forces, Moments & Flotation
Solution
A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water
A
i only
B
ii only
C
iii only
D
i and ii
E
i and iii
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
i. There is tension on the water surface.
The surface tension of water supports the needle, allowing it to float against the force of gravity.
ii. Kerosene reduces the density of water so that the needle becomes denser than water.
Kerosene does not change the density of water. It forms a separate layer on top, while the density of water remains unchanged.
iii. Kerosene reduces the surface tension of water.
Adding kerosene decreases the surface tension of water, which can eliminate the buoyant force that keeps the needle afloat.
Therefore, The accurate statements are i and iii. are correct.
Source: Myschool Past Questions Archive (Record #28704)
Physics
UTME / JAMB 1984
Current Electricity & Electric Circuits
Which of the following statements describes an atom accurately? i. atoms of all elements are identical ii. an atom contains a nucleus and number of electrons iii. due to the electrons in the atom an atom is negatively charged iv. electrons in the atom move in circular orbits round the nucleus
A
i and ii
B
ii and iii
C
iii and iv
D
ii and iv only
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 #28706)