question_answer

Which of the following length measurements is (i) most precise and (ii) least precise? Give reason (i) \[l\mathbf{ =5cm}\] (ii) \[l\mathbf{=5}\mathbf{.00cm}\] (iii) \[\mathbf{5}.\mathbf{000}\text{ }\mathbf{cm}\] (iv) \[\mathbf{5}.\mathbf{000}\text{ }\mathbf{cm}\] (\[\upsilon \])\[~\mathbf{5}.\mathbf{00000}\text{ }\mathbf{cm}\].

Answer:

                  (i) The last measurement is most precise, because it has been taken with an instrument whose least count is equal to\[0.0000\text{1 cm}\]. (ii) The first measurement is least precise because it has been taken with a device having least count equal to\[\text{1 cm}\].