Explanation
Because dimension of invar does not vary with temperature.
Young’s modulus of wire depends only on the nature of the material of the wire.
Greater the value of Young’s modulus of a substance, higher is the elasticity. Out of the given substances, steel has greater value of Young’s modulus. Therefore, steel has highest elasticity.
In case of shearing stress there is a change in shape without any change in volume. In case of hydraulic stress there is a change in volume without any change in shape. In case of tensile stress there is no change in volume.
Metals have larger values of Young’s modulus than alloys and elastomers.
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