Match List I with List II :

	LIST I		LIST II
A.	A force that restores an elastic body of unit area to its original state	I.	Bulk modulus
B.	Two equal and opposite forces parallel to opposite faces	II.	Young's modulus
C.	Forces perpendicular everywhere to the surface per unit area same everywhere	III.	Stress
D.	Two equal and opposite forces perpendicular to opposite faces Choose the correct answer from the options given below :	IV.	Shear modulus

Choose the correct answer from the options given below :

<p>To match List I with List II, we must understand the definitions or concepts described in List I and associate them with the correct terms in List II.</p> <ul> <li><strong>A. A force that restores an elastic body of unit area to its original state:</strong> This definition describes <strong>Stress</strong>, as stress is the force applied over a unit area of a material that results in a deformation. Stress is involved in restoring the body to its original state.</li> <li><strong>B. Two equal and opposite forces parallel to opposite faces:</strong> This is a description of <strong>Shear Modulus (also known as Modulus of Rigidity)</strong>, which measures the material's response to shear stress (like forces applied parallel to one of its faces).</li> <li><strong>C. Forces perpendicular everywhere to the surface per unit area same everywhere:</strong> This definition resembles the concept of <strong>Bulk Modulus</strong>, which is concerned with uniform pressure applied in all directions at points on the surface of a body and relates to volume change.</li> <li><strong>D. Two equal and opposite forces perpendicular to opposite faces:</strong> This describes <strong>Young's Modulus (also known as Modulus of Elasticity)</strong>, which involves tensile stress (force applied perpendicularly) leading to changes in length of a material.</li> </ul> <p>Therefore, matching the lists results in the following:</p> <ul> <li>(A)-(III), because stress is the general concept applicable to the force per unit area described in restoring the body to its original state.</li> <li>(B)-(IV), because shear modulus is specifically related to parallel forces applied on opposite faces.</li> <li>(C)-(I), because bulk modulus deals with situations where force is applied uniformly over the surface of an object, affecting its volume.</li> <li>(D)-(II), because Young's modulus applies to forces perpendicular to the faces, affecting the length of a material.</li> </ul> <p>Hence, the correct option is <strong>Option B (A)-(III), (B)-(IV), (C)-(I), (D)-(II)</strong>.</p>