Match the structural joining systems in Group I with the corresponding materials for which they are commonly used in Group II.
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Always match each joining system with the material it is historically and structurally associated with: welding–steel, spider connectors–glass, mortise and tenon–timber, mortar–brick.
To correctly solve the matching problem, we identify the most appropriate material for each joining method commonly used in construction.
Welding (P) → Steel (4): Welding is primarily used for metals. Among the options, steel is the most common structural material joined by welding, especially in frames, trusses and heavy structures.
Spider Connector (Q) → Glass (1): Spider connectors are specialized fittings designed for frameless glass façades. They support glass panels without visible framing systems. Hence, their primary application is clearly associated with glass.
Mortise and Tenon (R) → Timber (5): This is a traditional wood joinery technique used exclusively in carpentry. It is one of the oldest structural connections used for wooden frames and furniture, making timber the correct match.
Mortar (S) → Brick (3): Mortar is the binding material used to join bricks, blocks and stones in masonry. Therefore, the correct association is with brick masonry.
Thus the final mapping is:
P → 4, Q → 1, R → 5, S → 3
which corresponds to option (D).
Final Answer: (D) P-4, Q-1, R-5, S-3
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