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(B) $(i)$ The suspension fibre of a galvanometer undergoes twisting,which involves shear stress and strain. Thus,$(i) - b$.$(ii)$ Bending of a beam in

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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 strain. Thus,$(i) - b$.$(ii)$ Bending of a beam involves both longitudinal (linear) and shear stresses,but it is primarily associated with Young's modulus (linear elasticity). Thus,$(ii) - a$.$(iii)$ Cutting a piece of paper involves applying a force that causes the material to fail under shear stress. Thus,$(iii) - d$.$(iv)$ Mechanical waves in a fluid (like sound waves) involve volume changes due to pressure,which is governed by Bulk modulus. Thus,$(iv) - c$.Therefore,the correct matching is $(i)-b, (ii)-a, (iii)-d, (iv)-c$.

System	Type of Elasticity
$(i)$ 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:

System Type of Elasticity

$(i)$ 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: System Type of Elasticity $(i)$ 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