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Standard VII
Physics
Elasticity
Elasticity is...
Question

Elasticity is the property of a matter to:

A
Get stretched as much as possible
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B
Regain it's shape after getting deformed.
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C
Get deformed, on application of an external load.
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D
None of the above.
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Solution

The correct option is B Regain it's shape after getting deformed.
As we discussed elasticity is the property fo a matter to regain it's shape after getting deforced; on the application of an external load.

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Q. Match the Column I with Column II
Column IColumn II
(A) A body which regains its original shape after the removal
of external forces		(p) Elasticity
(B) A body which does not regain its original shape after the removal
of external forces.		(q) Elastic body
(C) A body which does not show any deformation on applying external
forces		(r) Plastic
body
(D) The property of the body to regain its original configuration when
the deforming forces are removed.		(s) Rigid
body

Q.

IF PVC IS A BAD CONDUCTOR OF ELECTRICITY AND HEAT, HOW IS IT KNOWN AS A THERMOPLASTIC ,WHICH GETS DEFORMED ON THE ACTION OF HEAT?

Q. Materials get deformed when force is applied. Some of them regain their status when the applied force is removed. They are termed as elastic. Those of which not regaining are called plastic. There may be delay in the regaining in some materials. They are said to have got elastic aftereffect, since they have gone beyond the elastic limit. Repeated application and removal of force break at any point time and so are avoided.
The stress strain graph for two materials A and B is shown in the following figure:
If the intensity of A and B is EA and EB, respectively, then
158104_840a8de1353d40bf85ea9694e1a94b4b.png
Q. Materials get deformed when force is applied. Some of them regain their status when the applied force is removed. They are termed as elastic. Those of which not regaining are called plastic. There may be delay in the regaining in some materials. They are said to have got elastic aftereffect, since they have gone beyond the elastic limit. Repeated application and removal of force break at any point time and so are avoided.
The stress strain graph for two materials A and B is shown in the following figure:
The time in which the two materials regain their original status is tA and tB related as tB=2tB. Then the material under elastic aftereffect (relatively) is
158113_07626bf10ae24ff8b13ec9a7eda46a66.png
Q. A metal sheet with a circular hole is heated. The hole
(a) gets larger
(b) gets smaller
(c) retains its size
(d) is deformed
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