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Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x106m
A
25.3kms-1
B
4.2kms-1
C
4.0kms-1
D
11.3kms-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Vescape = \(\sqrt{2gR}\)
Vescape = \(\sqrt{2\times10\times6.4\times10^6}\)
Vescape = \(\sqrt{128000000}\)
Vescape = 11313.7085mS-1
Vescape = 11.313kmS-1
Source: Myschool Past Questions Archive (Record #26959)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is
A
48N
B
12N
C
27N
D
36N
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 #26960)
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
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
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
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)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
Solution
The maximum power transfer occur in a cell when the external resistance is
A
Twice the internal resistance of the cell
B
The same as the internal resistance of the cell
C
Greater than the internal resistance of the cell
D
Less than the internal resistance of the cell
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
the maximum power transfer theorem states that the maximum power is transferred from a source e.g. cell or battery to its load (external resistance) when the resistance of the load is equal to the internal resistance of the source.
Source: Myschool Past Questions Archive (Record #26983)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
PHCN measures its electrical energy in
A
W
B
KWh
C
Wh
D
J
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 #26986)
Physics
UTME / JAMB 2014
Mechanics and Properties of Matter
What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)
A
Ionization
B
Fusion
C
Fission
D
Chain
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 #26994)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
An object of mass m moves with a uniform speed v round a circular path of radius r. If its angular speed is \(\omega\), the magnitude of the centripetal force acting on it is
A
\(m \omega^2 r\)
B
\(\frac{mv^2}{r}\)
C
\(m \omega r\)
D
\(\frac{mv^2}{r^2}\)
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 #35738)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
When an elastic material is stretched by a force, the energy stored in it is
A
kinetic
B
potential
C
thermal
D
electrical
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 #35739)