Correct Answer - Option 3 : 3.4 metres
As per National Building Code of India, Cl- 12.2, the following provisions shall be used in reference to the floor heights or also called ceiling heights:
A. For residential, business and mercantile buildings:
1. The height of all rooms for human habitation shall not be less than 2.75 m measured from the surface of the floor to the lowest point of the ceiling (bottom of slab).
2. In the case of air-conditioned rooms, a height of not less than 2.4 m measured from the surface of the floor to the lowest point of air-conditioning duct or the false ceiling shall be provided.
B. For educational and industrial buildings:
1. Educational Buildings- Ceiling height is restricted to 3.6 m for all regions except in cold regions where it is restricted to 3 m.
2. Industrial Buildings: Ceiling height is restricted to 3.6 m, except when air-conditioned, it is restricted to 3 m.
Government buildings may be considered as part of industrial buildings; therefore floor height is restricted to 3.6 m. The most appropriate is option ‘3’.
