Question

The length of the drawing is 20 cm, the scale is given as 2:1. Find the actual length.

(a) 50 cm

(b) 10 cm

(c) 25 cm

(d) 10 mm

I got this question in an online quiz.

This intriguing question originated from Representative Factor topic in chapter Scales of Engineering Drawing

Answer 1

Correct option is (b) 10 cm

For explanation: The scale given is 2:1 (enlarging scale) that is the drawing is made 2 times of actual dimensions. So we have to divide the drawing length with 2. 20 mm / 2 =100 mm and 1 cm =10 mm. The actual length in cm is 10 cm.