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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
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B
Only scale C
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C
Only scale A
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D
Only scales A and B
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Solution

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.

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