MCQ
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:

  • A
    Both $(A)$ and $(R)$ are true and $(R)$ is not the correct explanation of $(A)$
  • $(A)$ is true but $(R)$ is false
  • C
    $(A)$ is false but $(R)$ is true
  • D
    Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$

Answer

Correct option: B.
$(A)$ is true but $(R)$ is false
b
In stretching of a spring shape charges therefore shear modulus is used.

$Y _{\text {copper }}< Y _{\text {stoel }}$

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