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Physics
UTME / JAMB 1985
Newton's Laws, Momentum & Collisions
Solution
A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is
A
0.16
B
0.63
C
0.80
D
1.60
E
2.00
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\mu\)R
= \(\mu\)mg
8 = \(\mu\) x 5 x 10
\(\mu\) = 0.16
Source: Myschool Past Questions Archive (Record #28561)
Physics
UTME / JAMB 1985
Newton's Laws, Momentum & Collisions
Solution
Which of the following is NOT a force?
A
Friction
B
Tension
C
Upthrust
D
Weight
E
Impulse
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Impulse is not a force; it is a measure of the change in momentum produced by a force acting over a period of time.
Source: Myschool Past Questions Archive (Record #28562)
Physics
UTME / JAMB 1985
Equilibrium of Forces, Moments & Flotation
Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is
A
at the mid-point of the meter rule
B
40cm from the lighter mass
C
40cm from the heavier mass
D
60cm from the heavier mass
E
indeterninate because the meter-rule is light
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 #28563)
Physics
UTME / JAMB 1985
Current Electricity & Electric Circuits
Solution
A 0.05kg bullet travelling at 500ms-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?
A
25N
B
50N
C
250N
D
500N
E
25 000N
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
F = ma
= m\(\frac{(v^2 - u^2)}{2s}\)
F = 0.05\(\frac{(0 - (500)^2)}{2 \times 0.25}\)
F = 25 000N
Source: Myschool Past Questions Archive (Record #28565)
Physics
UTME / JAMB 1985
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A thin aluminum plate has a surface area of 1.500m at 20ºC. What will be its surface area when it is cooled to -20ºC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).
A
1.503m2
B
1.500m2
C
1.498m2
D
1.497m2
E
1.490m2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\beta\) = 2\alpha
2 X2.5 x 10-5 = \(\frac{A_2 - 1.5}{1.5 \times (-20 -20)}\)
\(A_2 - 1.500\) = - 0.003m
\(A_2\) = - 0.003 + 1.500 = 1.497\(m^2\)
Source: Myschool Past Questions Archive (Record #28582)
Physics
UTME / JAMB 1985
Calorimetry, Latent Heat & Change of State
Solution
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1 oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
A
44oC
B
50oC
C
56oC
D
60oC
E
70oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat lost = heat gained
m x (80 - \(\theta\)) x 1.5 = m x (\(\theta\) - 20) x 1
\(\theta\) = 56oC
Source: Myschool Past Questions Archive (Record #28585)
Physics
UTME / JAMB 1985
Current Electricity & Electric Circuits
Solution
In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is
A
force
B
force/m
C
work
D
force/m3
E
energy/m3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
slope = pressure \(\div\) \(\frac{1}{volume}\)
= \(\frac{N}{m^3}\) x \(\frac{m^3}{1}\)
= Nm = work
Source: Myschool Past Questions Archive (Record #28599)
Physics
UTME / JAMB 1985
Current Electricity & Electric Circuits
Water shows anomalous behaviour.
A
below 0oC
B
between 0oC and 4oC
C
at exactly 4oC
D
between 4oC and 100oC
E
above 100oC
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 #28602)
Physics
UTME / JAMB 1985
Current Electricity & Electric Circuits
Solution
Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is
A
\(\frac{1}{4}\)
B
\(\frac{1}{2}\)
C
4
D
1
E
2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat = mc\(\theta\)
Hx = Dx x Vx x Cx x \(\theta\)x
Hy = Dy x Vy x Cy x \(\theta\)y
\(\frac{H_x}{H_y}\) = \(\frac{D_x \times V_x \times C_x \times \theta_x}{D_x \times V_x \times C_x \times \theta_x}\)
= 2 x \(\frac{1}{2}\)
= 1
Source: Myschool Past Questions Archive (Record #28608)
Physics
UTME / JAMB 1985
Calorimetry, Latent Heat & Change of State
Solution
A good calorimeter should be of
A
low specific heat capacity and low heat conductivity
B
low specific heat capacity and high heat conductivity
C
high specific heat capacity and high heat conductivity
D
high specific heat capacity and low heat conductivity
E
dull surface and low heat conductivity
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
High Specific Heat Capacity: This allows the calorimeter to absorb a significant amount of heat without a large increase in temperature, ensuring accurate measurements of heat transfer.
Low Heat Conductivity: This minimizes heat loss to or gain from the surroundings, helping to maintain the integrity of the temperature measurements.
Source: Myschool Past Questions Archive (Record #28611)
Physics
UTME / JAMB 1985
Calorimetry, Latent Heat & Change of State
Solution
Which of the following statements are NOT correct?
A
boiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
B
both the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
C
the saturated vapour presssure rises with increase in temperature
D
the saturated vapour pressure is independent of the volume available for the vapour
E
it is possible to boil water at a lower temperature than 100oC at high altitude
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
While external pressure can affect the liquid's boiling point (i.e., boiling occurs when the saturated vapor pressure equals the external pressure), the saturated vapor pressure itself is determined solely by the liquid's temperature.
Source: Myschool Past Questions Archive (Record #28615)
Physics
UTME / JAMB 1985
Gas Laws & Heat Transfer
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
A
Expansion
B
Conduction
C
Convection
D
Radiation
E
Evaporation
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 #28617)
Physics
UTME / JAMB 1985
Waves, Sound & Vibrations
Solution
In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms-1, what is the depth of the sea?
A
0.75km
B
1.50km
C
2.20km
D
3.00km
E
3.75km
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Echo time = 1 \(\div\) 2 = 0.5sec
depth = velocity x time
= 1500 x 0.5
= 750m = 0.75km
Source: Myschool Past Questions Archive (Record #28619)
Physics
UTME / JAMB 1985
Waves, Sound & Vibrations
Solution
When a sound wave passes from air into water its
A
speed and frequency increases but its wavelength remains the same
B
speed and wavelength increases but its frequency remains the same
C
speed decreases
D
speed remains the same but its frequency and wavelength change
E
speed increases but its frequency and wavelength decreases
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Speed: The speed of sound is greater in water than in air.
Frequency: The frequency of the sound wave remains constant when it transitions between different mediums.
Wavelength: Since the speed increases while the frequency remains constant, the wavelength must increase as well.
Source: Myschool Past Questions Archive (Record #28622)
Physics
UTME / JAMB 1985
Waves, Sound & Vibrations
Solution
If the fundamental frequency of a closed pipe organ on a day when the speed of sound is 340ms-1 is 170Hz, then the length of the pipe is
A
50cm
B
70cm
C
100cm
D
150cm
E
200cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\lambda\) = \(\frac{v}{f}\)
= \(\frac{340}{170}\)
= 2m ; for closed pipe
L = \(\frac{1}{4}\)\(\lambda\)
= \(\frac{1}{4}\) x \(\frac{2}{1}\)
= 0.5m
= 50cm
Source: Myschool Past Questions Archive (Record #28623)