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Physics

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Slide 1
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Deformation of Solid
Answer all questions within the time provided
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Question 2
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Q.
What is Young modulus
answer
stress / strain
stress per strain
stress over strain
stress / strain
alternatives
stress per strain
stress over strain
answer explanation
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Question 3
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Q.
Explain what is elastic deformation.
answer
A material will return to its original shape or dimension when force applied to it is removed.
An object will return to its original shape or dimension when force applied is being removed
When a force is being removed, the material return to its original shape or dimension
A material will return to its original shape or dimension when force applied to it is removed.
alternatives
An object will return to its original shape or dimension when force applied is being removed
When a force is being removed, the material return to its original shape or dimension
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Question 4
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Q.
A copper wire hangs vertically from a fixed point. A load is attached to the lower end of the wire
producing an extension x. The wire obeys Hooke’s law.

Which single change gives an extension 2x?
answer choices
Halve the cross-sectional area of the wire.
Halve the diameter of the wire.
Halve the length of the wire.
Halve the load on the wire.
Halve the cross-sectional area of the wire. 
alternatives
Halve the diameter of the wire. 
Halve the length of the wire. 
Halve the load on the wire. 
answer explanation
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Question 5
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Q.
A wire is stretched by a force F so that it experiences an extension of x. The energy stored in the wire is $\frac{1}{2}Fx$ only if
answer choices
the elastic limit of the wire is not exceeded
the tensile force is proportional to the extension
the weight of the wire is neglected
the cross sectional area of the wire does not change
the elastic limit of the wire is not exceeded
alternatives
the tensile force is proportional to the extension
the weight of the wire is neglected
the cross sectional area of the wire does not change
answer explanation
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Question 6
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Q.
a steel wire has original length l, cross-sectional area A, and Young modulus Y. The force constant of the wire can be expressed as
answer choices
$\frac{AY}{l}$
$\frac{Al}{Y}$
$\frac{Y}{Al}$
$\frac{l}{AY}$
 <math><semantics><mrow><mfrac><mrow><mi>A</mi><mi>Y</mi></mrow><mi>l</mi></mfrac></mrow><annotation encoding="application/x-tex">\frac{AY}{l}</annotation></semantics></math>lAY 
alternatives
 <math><semantics><mrow><mfrac><mrow><mi>A</mi><mi>l</mi></mrow><mi>Y</mi></mfrac></mrow><annotation encoding="application/x-tex">\frac{Al}{Y}</annotation></semantics></math>YAl 
 <math><semantics><mrow><mfrac><mi>Y</mi><mrow><mi>A</mi><mi>l</mi></mrow></mfrac></mrow><annotation encoding="application/x-tex">\frac{Y}{Al}</annotation></semantics></math>AlY 
 <math><semantics><mrow><mfrac><mi>l</mi><mrow><mi>A</mi><mi>Y</mi></mrow></mfrac></mrow><annotation encoding="application/x-tex">\frac{l}{AY}</annotation></semantics></math>AYl 
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Question 7
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is the ability of a material to shape or bend from the use of compressive force
answer
Malleable
Malleable
alternatives
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Question 8
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Q.
Which of the following does not influence the strain of a wire when a vertical wire of uniform diameter is stretched at its lower end?
answer choices
Young modulus
cross-sectional area
original length
stress
Young modulus
alternatives
cross-sectional area
original length
stress
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Question 9
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A metal wire is stretched by a load. The force-extension graph is shown.
answer choices
the change in gravitational potential energy of the wire
the energy that would be released from the wire if the final load was removed
the energy transferred into heat energy in the wire
the work done in stretching the wire
the change in gravitational potential energy of the wire 
alternatives
the energy that would be released from the wire if the final load was removed 
the energy transferred into heat energy in the wire 
the work done in stretching the wire 
answer explanation
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Question 10
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A spring pulled by a force of 10 N, produces an extension of 40 mm. Two identical springs arranges in series produce a total extension of 40 mm. What is the energy stored in the two springs?
answer choices
0.05 J
0.10 J
0.15 J
0.20 J
0.05 J
alternatives
0.10 J
0.15 J
0.20 J
answer explanation
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Question 11
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This material will not undergo / will undergo very little plastic deformation before break
answer
brittle
brittle
alternatives
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Question 12
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A material that can be drawn into wire
answer choices
malleable
ductile
strong
brittle
malleable
alternatives
ductile
strong
brittle
answer explanation
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Question 13
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The tension of a stretched wire is given by $T=\frac{\lambda}{l}$ with $\Delta x$ as the extension, $l$ as the original length of the wire and $\lambda$ as a constant. If the cross sectional area is $A$ ,the expression of Young modulus of the wire is
answer choices
$\frac{\lambda}{A}$
$\frac{\lambda}{A\Delta x}$
$\frac{\lambda}{l}$
$\frac{Al}{\Delta x}$
 <math><semantics><mrow><mfrac><mi>λ</mi><mi>A</mi></mfrac></mrow><annotation encoding="application/x-tex">\frac{\lambda}{A}</annotation></semantics></math>Aλ 
alternatives
 <math><semantics><mrow><mfrac><mi>λ</mi><mrow><mi>A</mi><mi mathvariant="normal">Δ</mi><mi>x</mi></mrow></mfrac></mrow><annotation encoding="application/x-tex">\frac{\lambda}{A\Delta x}</annotation></semantics></math>AΔxλ 
 <math><semantics><mrow><mfrac><mi>λ</mi><mi>l</mi></mfrac></mrow><annotation encoding="application/x-tex">\frac{\lambda}{l}</annotation></semantics></math>lλ 
 <math><semantics><mrow><mfrac><mrow><mi>A</mi><mi>l</mi></mrow><mrow><mi mathvariant="normal">Δ</mi><mi>x</mi></mrow></mfrac></mrow><annotation encoding="application/x-tex">\frac{Al}{\Delta x}</annotation></semantics></math>ΔxAl 
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Question 14
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At ______, plastic deformation starts.
answer
Yield point
Yield point
alternatives
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Question 15
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Q.
The following quantities are required to calculate Young modulus
answer choices
initial length
Force applied to material
diameter of the material
Mass of the material
initial length
alternatives
Force applied to material
diameter of the material
Mass of the material
answer explanation
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