Question

You are provided three scales A, B and C as shown in figure to measure a length of 11 cm. Which of the following scale(s) can you use for correct measurement?

Scale A Scale B Scale C

• A. Only scales A and C
• B. Only scale C
• C. Only scale A
• D. Only scales A and B

Answer 1

The correct option is A Only scales A and C

Now, the correct scale should be the scale which can measure 11 cm.

• Scale A has full mark from 2 cm to 13 cm. The maximum length this scale can measure = 13 - 2 = 11 cm. So, scale A can measure 11 cm length.
• Scale B has full mark from upto 10 cm only. So, scale B cannot measure 11 cm.
• Scale C has full mark from 0 cm to 11 cm. The maximum length this scale can measure = 11 - 0 = 11 cm. This value is equal to the required length to be measured. Thus, this scale B can be used.

Thus, both scales A and C can be used to measure 11 cm length.