Question 73: Properties of Matter

Question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The property of body, by virtue of which it tends to regain its original shape when the external force is removed, is Elasticity.
Reason (R) : The restoring force depends upon the bonded inter atomic and inter molecular force of solid.
In the light of the above statements, choose the correct answer from the options given below :

Accepted Answer

The statement given as Assertion (A) is indeed true. Elasticity is a physical property of a material whereby it can restore it to its original shape or size after deformation (stretching, compressing, or twisting) provided the deformation is within the material's elastic limit. Once the external force is removed, an elastic material will return to its initial state due to its intrinsic property. So, we can affirm the validity of Assertion (A).
The statement labelled as Reason (R) is also true. When a material is deformed due to an applied external force, the molecules within the material are displaced from their equilibrium positions. The intermolecular and interatomic forces create a restoring force that attempts to bring the molecules back to their original, or equilibrium, positions. This restoring force is what allows the material to regain its shape when the external force is removed, assuming the material has not been deformed beyond its elastic limit. Hence, the restoring force indeed depends on the bonded interatomic and intermolecular forces within a solid.
Furthermore, Reason (R) is not just a true statement in isolation, but it is the correct explanation for Assertion (A). The reason that a material exhibits elasticity (Assertion A) is directly tied to the nature of the restoring force (Reason R), which is a result of the bonded interatomic and intermolecular forces within the material. Without these restoring forces, the material would not be able to return to its original shape, and thus would not exhibit elasticity.
Therefore, the correct answer to the given question is:
Option C
Both (A) and (R) are true and (R) is the correct explanation of (A)

Answer

(A) is false but (R) is true

Answer

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Answer

Both (A) and (R) are true and (R) is the correct explanation of (A)

Answer

(A) is true but (R) is false

Properties of Matter

Choose the correct answer: