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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS
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What is the Young's modulus of elasticity for a perfectly rigid body?
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Correct option: A
Infinity
Option A (Infinity) is correct because a perfectly rigid body has zero strain for any amount of stress, leading to an infinite Young's modulus.
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Assertion: From the relation we can say that, if length of a wire is doubled, its Young's modulus of elasticity will also becomes two times.
Reason: Modulus of elasticity is a material property. A wire can be broken by applying a load of 200 N. The force required to break another wire of the same length and same material, but double in diameter, is Assertion(A): If radius of cylindrical wire is doubled, then this wire can bear four times stress.
Reason(R): By doubling the radius, area of cross-section will become four times.
Reason: Modulus of elasticity is a material property. A wire can be broken by applying a load of 200 N. The force required to break another wire of the same length and same material, but double in diameter, is Assertion(A): If radius of cylindrical wire is doubled, then this wire can bear four times stress.
Reason(R): By doubling the radius, area of cross-section will become four times.