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Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is
A
Average
B
Zero
C
Negative
D
Positive
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 #26961)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
What happens when three coplanar non-parallel forces are in equilibrium?
A
Their lines of action are parallel.
B
They are represented in magnitude only
C
They are represented in direction only
D
Their lines of action meet at a point
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Conditions for non-parallel coplanar forces
Source: Myschool Past Questions Archive (Record #26962)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is
A
200J
B
4000J
C
2000J
D
500J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Kinetic Energy = mgh
= 20 x 10 x 10 J
= 2000J
Source: Myschool Past Questions Archive (Record #26963)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
The energy in the nucleus of atoms produce heat which can be used to generate
A
Kinetic energy
B
Mechanical energy
C
Electrical energy
D
Potential energy
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Electrical energy: This is primarily done in nuclear power plants, where the heat generated from nuclear reactions is used to produce steam that drives turbines, ultimately generating electricity.
Source: Myschool Past Questions Archive (Record #26964)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.
A
343.32N
B
233.33N
C
333.33N
D
334.33N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{MA}{VR}\times\frac{100}{1}=efficiency\)
\(\frac{L}{E}\frac{1}{VR}\times\frac{100}{1}=75\)
\(\frac{1000}{E}\frac{1}{4}\times\frac{100}{1}=75\)
\(E = \frac{250 \times 100}{75}\)
E = 333.3N
Source: Myschool Past Questions Archive (Record #26965)
Physics
UTME / JAMB 2014
Heat Energy & Temperature
Solution
A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is
A
90%
B
80%
C
85%
D
87%
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
VR = 800/200 = 4
\(Efficiency = \frac{MA}{VR} \times \frac{100}{1}\)
\(Efficiency = \frac{L}{E} \times \frac{1}{VR} \times \frac{100}{1}\)
\(Efficiency = \frac{800}{250} \times \frac{1}{4} \times \frac{100}{1}\)
= 78.74%
= 80%
Source: Myschool Past Questions Archive (Record #26966)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
A force of 500N1 is applied to a steel wire of cross-sectional area 0.2m2, The tensile stress is
A
2.5x104Nm-2
B
1.0x102Nm-2
C
1.0x103Nm-2
D
2.5x103Nm-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(Stress = \frac{Force}{Area}\)
\(Stress = \frac{500}{0.2} = 2500\)
= 2.5 x 103Nm-3
Source: Myschool Past Questions Archive (Record #26967)
Physics
UTME / JAMB 2014
Heat Energy & Temperature
The small droplets of water that form on the grass in the early hours of the morning is
A
Fog
B
Haul
C
Mist
D
Dew
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 #26968)
Physics
UTME / JAMB 2014
Heat Energy & Temperature
Solution
What is the equivalent of 20K in Celsius scale?
A
-253oC
B
-293oC
C
68oC
D
36oC
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
= (20 - 273)^\circC
= -253^\circC
Source: Myschool Past Questions Archive (Record #26969)
Physics
UTME / JAMB 2014
Thermal Physics
Solution
The equation PaVbTc= constant reduces to Charles Law if
A
a=1, b=1and c=0
B
a=1, b=0 and c=-1
C
a=0, b=1 and c=1
D
a=0, b=1 and c=-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
if a=0, b=1 and c=-1 then
P0V1T-1 = V/T (Charles Law)
Source: Myschool Past Questions Archive (Record #26970)
Physics
UTME / JAMB 2014
Thermal Physics
The quantity of heat needed to raise the temperature of a body by 1K is the body's
A
Heat capacity
B
Internal energy
C
Specific heat capacity
D
Latent heat of fusion
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 #26971)
Physics
UTME / JAMB 2014
Heat Energy & Temperature
The melting point of a substance is equivalent to its
A
Vapour Pressure
B
Solidification Temperature
C
Liquidification Temperature
D
Solidification Pressures
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 #26972)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
The temperature at which the water vapour present in the air is just sufficient to saturate air is
A
Boiling point
B
Ice point
C
Saturation point
D
Dew point
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The dew point is defined as the temperature to which air must be cooled (at constant pressure and without adding or removing moisture) for the water vapor present in it to become just sufficient to saturate the air, meaning the relative humidity reaches 100%, and condensation (like dew) begins if cooled further
Source: Myschool Past Questions Archive (Record #26973)
Physics
UTME / JAMB 2014
Heat Energy & Temperature
Solution
Heat transfer by convection in a liquid is due to the
A
Latent heat of vaporization of the liquid
B
Increased vibration of the molecules of the liquid about theit mean position
C
Variation of density of the liquid
D
Expansion of the liquid as it is heated
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Liquids and gases expand when they are heated. The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas.
Source: Myschool Past Questions Archive (Record #26974)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
A
2.0x102Hz
B
4.5x103Hz
C
2.0x103Hz
D
4.5x102Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Wavelength = 15cm = 0.15m
Velocity = 300m/s
V = fx
F = V/Wavelength
F = 300/0.15 Hertz
F = 2 x 103Hz
Source: Myschool Past Questions Archive (Record #26975)