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NEET2019PhysicsMechanical Properties of SolidsActual

Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring. Reason : Steel is more elastic than copper.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

As, work done =1 / 2 stress strain =1 / 2 Y ( strain )^2 Since elasticity of steel is more than that of copper hence more work has to be done in order to stretch the steel.

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