Questions in Mechanical Properties of Solids

Select	Question
	A rubber pipe of density $1.5\times {{10}^{3}}\,N/{{m}^{2}}$ and Young's modulus $5\times {{10}^{6}}\,N/{{m}^{2}}$ is suspended from the roof. The length of the pipe is $8 m$. What will be the change in length due to its own weight
	In which case there is maximum extension in the wire, if same force is applied on each wire
	If a spring is extended to length $l$, then according to Hook's law
	Which of the following affects the elasticity of a substance
	An iron rod of length $2m$ and cross section area of $50\,m{{m}^{2}}$, stretched by $0.5 mm$, when a mass of $250 kg$ is hung from its lower end. Young's modulus of the iron rod is
	In solids, inter-atomic forces are
	A force $F$ is applied on the wire of radius $r$ and length $L$ and change in the length of wire is $l$. If the same force $F$ is applied on the wire of the same material and radius $2r$ and length $2L$, Then the change in length of the other wire is
	The modulus of elasticity is dimensionally equivalent to
	Under elastic limit the stress is
	A steel wire of lm long and $1\,m{{m}^{2}}$ cross section area is hang from rigid end. When weight of $1kg$ is hung from it then change in length will be (given $Y=2\times {{10}^{11}}N/{{m}^{2}})$