if a body completely regains its original shape and size after removal of an external deforming force, such body is known as _______.

  1. Perfectly elastic body
  2. Perfectly plastic body
  3. Deformed body
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : Perfectly elastic body
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Detailed Solution

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CONCEPT:

  • Deforming force: The external force applied on a body that causes the same change in its configuration, i.e., Length, Volume, or Shape of an object, then such force is known as deforming force
  • Perfectly elastic body: if a body completely regains its original shape and size after removal of an external deforming force, such a body is known as perfectly elastic.
  • Elastic limit: It is a limit used to describe the maximum deforming force any material can withstand without getting permanently deformed (It will be used in Hooke’s law).

EXPLANATION:

  • From the above example we can see that if a body regain its original position under an external, such object are termed as a perfectly elastic object
  • Hence option 1 is correct among all.
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