First slide

Elastic behaviour of solids

Question

Assertion: Rubber is more elastic than steel.
Reason: A material which stretches more is more elastic.

Easy

A

Both (A) and (R) are true and (R) is the correct explanation of (A)
B

Both (A) and (R) are true and (R) is not the correct explanation of (A)
C

(A) is true but (R) is false
D

If both A and R are false

Solution

$Y = \frac{F L}{A e}$
$Y \propto \frac{1}{e}$
more is the elongation, less is the elastic nature for a given load.
Steel elongates less than rubber. Therefore steel is more elastic than rubber

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