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Topic: Elastic behaviour, stress-strain, Hooke's law, Young's, bulk and rigidity moduli· Properties of Solids and Liquids

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : The stretching of a spring is determined by the shear modulus of the material of the spring.Reason (R) : A coil spring of copper…

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : The stretching of a spring is determined by the shear modulus of the material of the spring.

Reason (R) : A coil spring of copper has more tensile strength than a steel spring of same dimensions.

In the light of the above statements, choose the most appropriate answer from the options given below :

1. (A) is false but (R) is true

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

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

4. (A) is true but (R) is false

1 answer

Best answer

Answer: 4. (A) is true but (R) is false

Assertion: when a spring is stretched, the wire of the coil is mainly twisted, which is a shear deformation, so it depends on the shear modulus. (A) is true.

Reason: steel has a higher Young's modulus and tensile strength than copper, so a copper spring is weaker. (R) is false.

(A) true, (R) false: option (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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