$Assertion :$ Strain causes the stress in an elastic body.
$Reason :$ An elastic rubber is more plastic in nature.
$Reason :$ An elastic rubber is more plastic in nature.
AIIMS 2014, Medium
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Young'smodulus$(Y)=\frac{\text {stress}}{\text {strain}}$
If strain changes stress also changes since $Y$ is constant for a material.
Also, poisson's ratio $=\frac{\text { lateralstrain }}{\text { longitudinalstrain }}$
$\nu=0.5$ for rubber and is most elastic material.
So, both are correct but not reason of assertion.
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