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(B) $(i)$ The suspension fibre of a galvanometer undergoes twisting,which involves shear stress and shear strain. Thus,it relates to $(b)$ Shear.$(ii)

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$i-b, ii-a, iii-d, iv-c$

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(B) $(i)$ The suspension fibre of a galvanometer undergoes twisting,which involves shear stress and shear strain. Thus,it relates to $(b)$ Shear.$(ii)$ Bending of a beam involves both longitudinal (linear) and shear stresses,but it is primarily associated with $(a)$ Linear (Young's modulus) elasticity.$(iii)$ Cutting a piece of paper involves applying a force that causes the material to shear along the cutting line. Thus,it relates to $(d)$ Shear.$(iv)$ Mechanical waves in a fluid (like sound waves) involve volume changes due to pressure variations,which is described by $(c)$ Bulk modulus.Therefore,the correct matching is $(i-b, ii-a, iii-d, iv-c)$.

Process	Elasticity Type
$(i)$ Suspension fibre of galvanometer	$(a)$ Linear
$(ii)$ Bending of beam	$(b)$ Shear
$(iii)$ Cutting piece of paper	$(c)$ Bulk
$(iv)$ Mechanical waves in fluid	$(d)$ Shear

Match the type of elasticity involved:

Process Elasticity Type

$(i)$ Suspension fibre of galvanometer $(a)$ Linear

$(ii)$ Bending of beam $(b)$ Shear

$(iii)$ Cutting piece of paper $(c)$ Bulk

$(iv)$ Mechanical waves in fluid $(d)$ Shear

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Match the type of elasticity involved: Process Elasticity Type $(i)$ Suspension fibre of galvanometer $(a)$ Linear $(ii)$ Bending of beam $(b)$ Shear $(iii)$ Cutting piece of paper $(c)$ Bulk $(iv)$ Mechanical waves in fluid $(d)$ Shear