Question

A line is perpendicular to profile plane, the perpendicular distance from 1st end of the line to vertical plane is 20 cm and perpendicular distance of 2nd end of line to horizontal plane is 10 cm. What is the distance from 1st end of line to vertical plane?

(a) 15 cm

(b) 20 cm

(c) 10 cm

(d) Can’t say

This question was posed to me during an interview for a job.

The question is from Projection of Line Perpendicular to one of the Plane topic in chapter Projection of Lines of Engineering Drawing

Answer 1

Correct answer is (b) 20 cm

The explanation: As the projection of planes are mutual perpendicular plane if a line is perpendicular to one of the planes then it would be parallel to rest of the planes that is both ends will be equidistant from plane.