Staircase Design MCQ with answer and solution

Concept

Minimum staircase width in public buildings

Formula

NONE

Step-by-step solution

1. Public buildings cater to higher occupancy levels requiring wider exit facilities for emergency evacuation. 2. NBC 2005 mandates larger minimum staircase dimensions for public and assembly occupancies. 3. The prescribed minimum width of a staircase in public buildings is 1.5 m. Answer: C

Explanation

Public buildings handle higher occupant loads and require wider staircases to support rapid crowd evacuation during emergencies. NBC 2005 mandates that the minimum width of staircases in public or institutional buildings must be 1.5 m. Therefore, 1.5 m is the correct requirement.

Why the other options are wrong

A) 1.0 m is the minimum staircase width permitted for single-family residential buildings. B) 1.2 m is the minimum staircase width required for educational buildings. D) 1.8 m is the minimum staircase width required for hospital buildings to accommodate stretchers.

Shortcut

Minimum staircase width for public buildings is 1.5 m.

Common mistake

Confusing public building staircase minimum width (1.5 m) with residential building staircase standards (1.0 m).