Question

The negative horizontal plane and positive horizontal makes _____ angle with each other.

(a) 90 degrees

(b) 180 degrees

(c) 120 degrees

(d) 270 degrees

The question was asked by my college director while I was bunking the class.

Query is from Planes of Projections and Four Quadrants in section Loci of Points & Orthographic Projections of Engineering Drawing

Answer 1

The correct option is (b) 180 degrees

To elaborate: The negative horizontal plane means the part of horizontal plane which lies in 2nd quadrant. The positive and negative planes are parallel to each other so the angle between the parallel planes is always 180 degrees.