Question

Shown are schematic diagrams of a regular door latch. $X$ is the door, $Y$ the frame. Identify which latch can correctly lock the door.

• A. A
• B. B
• C. C
• D. D

Hint:

For latch schematics: bolt housing on the moving leaf (door), keeper on the fixed frame, and bolt motion directed into the frame—not toward the hinges.

Answer 1

The Correct Option is B

Rule: The sliding bolt must be fixed on the door panel (X) and travel toward the keeper/socket on the frame (Y) when pushed to lock. The bolt’s travel must be away from the door’s hinge side so it can enter the frame slot.
In (B) the bolt body is mounted on $X$ and its tip aligns to slide directly into the keeper on $Y$ when the door is closed—this locks correctly. In A, C, D either the keeper is on the wrong member or the bolt travels toward the hinge/away from the frame, so it cannot engage the frame slot. Hence \(\boxed{(B)}\).