If the temperature increases,the modulus of elasticity

Let a wire be suspended from the ceiling (rigid support) and stretched by a weight $W$ attached at its free end. The longitudinal stress at any point of cross-sectional area $A$ of the wire is:

If under an external force,a change in length $\Delta l$ occurs in a rod of original length $l$,then write the formula for longitudinal strain.

Check if the following statements are True or False:
$(a)$ The magnitude of Young's modulus is proportional to the increase in length.
$(b)$ Breaking stress is known as elasticity.
$(c)$ Quartz is an almost perfectly elastic body.

Which of the following is an amorphous solid?

$A$ wire of length $l$ and cross-sectional area $A$ is stretched by a weight $Mg$ such that its length becomes double. What is the stress in the wire?