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A hand span is a reliable measure of len...

A hand span is a reliable measure of length.

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False : Length of hand span is different for different people and hence it is not a reliable unit.
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Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it. (i) Sam measured it with a half metre long thread. (ii) Gurmeet measured it with a 15 cm scale from her geometry box. (iii) Reena measured it using her hand span. (iv) Salim measured it using a 5 m long measuring tape. Which one of them would get the most accurate length? Give reason for your answer.

The true value of a particular length is 4.283 cm. The three instuments A,B and C , used to measure this length give the readings 4.1 cm, 4.24 cm and 4.093cm. Arrange these readings in the increasing order of accuracy and precision. Which instrument is most reliable for measuring this length ?

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