Lesson Physics
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• Slide 1
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Deformation of Solid

Answer all questions within the time provided • Question 2
30 seconds
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Q.

What is Young modulus

stress / strain
alternatives
stress per strain
stress over strain
• Question 3
45 seconds
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Q.

Explain what is elastic deformation.

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
• Question 4
30 seconds
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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?

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.

• Question 5
30 seconds
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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

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

• Question 6
30 seconds
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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

$\frac{AY}{l}$

$\frac{Al}{Y}$

$\frac{Y}{Al}$

$\frac{l}{AY}$

• Question 7
30 seconds
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Q.

is the ability of a material to shape or bend from the use of compressive force

Malleable
• Question 8
30 seconds
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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?

Young modulus

cross-sectional area

original length

stress

• Question 9
30 seconds
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A metal wire is stretched by a load. The force-extension graph is shown.

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

• Question 10
30 seconds
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Q.

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?

0.05 J

0.10 J

0.15 J

0.20 J

• Question 11
10 seconds
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Q.

This material will not undergo / will undergo very little plastic deformation before break

brittle
• Question 12
10 seconds
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Q.

A material that can be drawn into wire

malleable

ductile

strong

brittle

• Question 13
30 seconds
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Q.

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

$\frac{\lambda}{A}$

$\frac{\lambda}{A\Delta x}$

$\frac{\lambda}{l}$

$\frac{Al}{\Delta x}$

• Question 14
10 seconds
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At ______, plastic deformation starts.

Yield point
• Question 15
30 seconds
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Q.

The following quantities are required to calculate Young modulus

initial length

Force applied to material

diameter of the material

Mass of the material

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