An orthographic is one way to describe a three dimensional object in two-dimensional space. Typically an orthographic will have the top, side and front views of an object drawn together with some kind of scale.

for NATA / JEE 2, you get a good number of orthographic questions.

For Nid / Uceed / Ceed you would get may be 1 or 2 questions.

None for NIFT exam.