The diagonal scales are used when measurements are required in _____ units.

A)
1
B)
2
C)
3
D)
4

Correct Answer : Option (C) :   3


Explanation : Using plain scale we can accommodate 2 units (example: yard, feet). But with the diagonal scale we can accommodate 3 units (example: yard, feet and inch). It is possible by the principle of diagonal division.