Question

For measuring a pencil box which of the following is suitable?
A. Long 30 cm metre scale
B. Small 15 cm metre scale
C. A tape of 5 m long
D. None of the above

Answer 1

Hint: The above problem can be resolved by analysing the length of the pencil box. As the pencil box's length may not exceed more than 15 centimetres, it is unrealistic to use the scales larger than the box's length.


Complete step by step answer
The pencil box consists of a not so long dimension and generally is available for the length of a few centimetres. Therefore, to measure the dimensional length of the pencil, various measuring instruments can be considered. These instruments include,
1. A long 30 cm metre scale.
2. A small 15 cm metre scale.
3. A tape of 5m long.
As per the first choice, the preferred and comfortable element of measurement for a pencil is a metre scale. Basically, the metre scale can be available in several forms. Out of which the length of 15 cm is most appropriate. This is because the length of pencil box does not exceed more than typical 13 cm, rather using the unnecessary longer measuring instruments, it is reliable and comfortable to measure the length of pencil box with the shorter metre scale, to achieve the reliable readings of lengths.
Rather other instruments like long 30 cm metre scale and the 5 m longer tape can also be considered, but they are not much reliable to measure shorter length and can be used to measure the longer dimensions only.
Therefore, for measuring a pencil box, the small 15 cm metre scale is used and option B is correct.


Note: Try to analyse the realistic dimension for the object and select the measuring instrument accordingly. Moreover, the knowledge of measurement and the measuring instruments can be applied to obtain accurate results.