Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETPhysicsMechanical Properties of Solids

Assertion (A): The stretching of a coil is determined by its shear modulus. Reason (R): Shear modulus changes only the shape of a body, keeping its dimensions unchanged.

Options

  1. ABoth A and R are true and R is the correct explanation of A.
  2. BBoth A and R are true but R is not the correct explanation of (A ).
  3. CA is true but R is false.
  4. D(A ) is false but (R ) is true.

Correct answer

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

Step-by-step solution

The stretching of a coil primarily involves a change in its length, which is governed by its Young's modulus (related to tensile or compressive stress), not its shear modulus. Shear modulus is associated with changes in the shape of a body due to shearing forces, where the dimensions remain largely unchanged. Therefore, Assertion (A) is false because stretching a coil is related to Young's modulus. Reason (R) is true as it correctly describes the effect of shear modulus on a body's shape without altering its dimens

Practice Mechanical Properties of Solids on Quantrex Academy →

More from Mechanical Properties of Solids

Match List I with List II : List I List II A. Young's Modulus I. d L ( L d ) B. Compressibility II. F L A( L) C. Bulk Modulus III. - 1 P ( V V ) D. Poisson's Ratio IV. -P ( V V ) C 2026A metallic bar of Young's modulus, 0.5 10¹¹ ~N ~m ⁻² and coefficient of linear thermal expansion 10⁻⁵ ^ C ⁻¹ , length 1 m and area of cross-section 10⁻³ ~m ^2 is heated from 0^ C t 2024The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are 8 10^8 ~N ~m ⁻² and 2 10¹¹ ~N ~m ⁻² , is: 2024Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A   2023The amount of elastic potential energy per unit volume (in SI unit) of a steel wire of length 100 ~cm to stretch it by 1 ~mm is (if Young's modulus of the wire =2.0 10¹¹ ~N ~m ⁻² ) 2023Given 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 modu 2022A wire of length L , area of cross section A is hanging from a fixed support. The length of the wire changes to L 1 when mass M is suspended from its free end. The expression for Y 2020Identify the incorrect statement. 2019 Full Mechanical Properties of Solids list All NEET PYQs