Question

A plot of 35,000 sq m is drawn on map as plot of 14 cm and 5 cm. Find the R.F.

(a) 1/35000

(b) 1/50000

(c) 1/34930

(d) 1/2236

This question was addressed to me during a job interview.

I'd like to ask this question from Diagonal Scales topic in portion Scales of Engineering Drawing

Answer 1

The correct choice is (d) 1/2236

Easy explanation: Area of plot in drawing is 14 x 5 = 70 sq cm (equivalent to 35000 sq m). So 1 sq cm =35000/70 = 500 sq m. 1 cm = square root of 500 m = 22.3 m (equivalent to 1 cm). Representative fraction = 1/ (22.36 m) =1/ (2236 cm).