The stairs which are kept in motion by a revolving drum is known as a ___

In case of ___ stair, there is a well or hole or opening between the flights in the plan.

_________ stairs are light in weight, they are mostly used for residential buildings.

___________ arrangement helps in improving the appearance of the face and also reduces the quality of concrete.

Identify the type of Arch given below.

Identify the type of Arch given below.

A Stair turning through one right angle is known as a ___ stair.

_________ is the horizontal distance between the faces of two consecutive Risers.