The Survey line which fixes up the direction of all other Survey line is:

The double ordinate passing through the focus of cone is:

Name the window where shatter open like doors are called :

The type of flooring perfectly noiseless and is used in theatre is named as:

Two walls meet at 90° a ------- quoin is formed.

A curve generated by a fixed point on the circumference of a circle which rolls without slipping along a fixed straight line is called :

The smallest reading that can be measured by using levelling staff is :

The method for drawing the isometric projection is

The canal which is not supposed to do any irrigation is called :

The geological formation which contains and readily yields water to tube wells