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The sill of a door is known as ________(a) Head(b) Frame(c) Shutter(d) ThresholdThe question was posed to me in an international level competition.The query is from Definition of Technical Terms in division Doors, Windows and Ventilators of Construction & Building Materials

Answer»

The correct choice is (d) Threshold

To explain: The sill of a DOOR is KNOWN as threshold. It is a CROSS WOODEN PIECE and is provided only when necessary. A sill is usually not provided for a door and is generally provided only for a window.



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