Question

The mean length of an object is $5\text{cm}$. Which of the following measurements is most accurate?

• A. $4.90\text{cm}$
• B. $4.85\text{cm}$
• C. $4.80\text{cm}$
• D. $4.75\text{cm}$

Answer 1

The correct option is A $4.90\text{cm}$

We know that accuracy is the closeness of the measured value with the true value. More close value of measurement with the true value more is the accuracy of the measurement.
So,
$\Delta L=5-4.90=0.10\text{cm}$
$\Delta L=5-4.85=0.15\text{cm}$
$\Delta L=5-4.80=0.20\text{cm}$
$\Delta L=5-4.75=0.25\text{cm}$
We can see that $4.90\text{cm}$ is more close to $5\text{cm}$, hence more accurate.