MECHANICAL PROPERTIES OF SOLIDS

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Q1. State Hooke's law of elasticity.

Ans.

Hooke’s law of elasticity: With in elastic limit, the stress is directly proportional to strain.

$Stress \propto strain$

$stress\, =\, K\, (strain)$


Q2. State the units and dimensions of stress.

Ans. S.I Unit- $Pascal$ ,(or) $N/\,m^{2}$ Dimensional Formula :$\,\,[M^{1}\,L^{-1}\,T^{-2}\,]$


Q3. State the units and dimensions of modulus of elasticity.

Ans. S.I Unit- $Pascal$ ,(or) $N/\,m^{2}$ Dimensional Formula :$\,\,[M^{1}\,L^{-1}\,T^{-2}\,]$


Q4. State the units and dimensions of Young's modulus.

Ans. S.I Unit- $Pascal$ ,(or) $N/\,m^{2}$ Dimensional Formula :$\,\,[M^{1}\,L^{-1}\,T^{-2}\,]$


Q5. State the units and dimensions of modulus of rigidity.

Ans. S.I Unit- $Pascal$ ,(or) $N/\,m^{2}$ Dimensional Formula :$\,\,[M^{1}\,L^{-1}\,T^{-2}\,]$


Q6. State the units and dimensions of Bulk modulus.

Ans. S.I Unit- $Pascal$ ,(or) $N/\,m^{2}$ Dimensional Formula :$\,\,[M^{1}\,L^{-1}\,T^{-2}\,]$


Q7. State the examples of nearly perfect elastic and plastic bodies.

Ans.

Nearly perfect elastic bodies: quartz, phosphor – bronze,
Nearly perfect plastic bodies: clay, putty, dough, butter. 


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