(A) : Steel is more elastic than rubber.
(R) : Under given deforming force, steel is deformed less than rubber.

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‘A’ is false but ‘R’ is true

Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’

‘A’ is true but ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

answer is A.

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Detailed Solution

The amount of force needed to cause a particular deformation determines how elastic the substance is; if the force is small, the substance is not very elastic.
On the other hand, it may be claimed that elasticity is determined by the strain a specific deforming force results in. Elasticity is high when the strain is low and low when the strain is high.
Therefore, taking into account existing knowledge and experience, rubber extends significantly more than steel for a given force used to stretch the substance.
This suggests that steel deforms less than rubber for a given deforming force. In light of this and the previous justification, we can say that steel is more elastic than rubber since it deforms less.

Hence the correct answer is Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

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