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  4. The internal and external diameters of a hollow cylinder are measured with the help of vernier callipers. Their values are 4.23±0.01cm and 3.87±0.01cm respectively. The thickness of the wall of the cylinder is

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Q. The internal and external diameters of a hollow cylinder are measured with the help of vernier callipers. Their values are $4.23\pm0.01cm$ and $3.87\pm0.01cm$ respectively. The thickness of the wall of the cylinder is

NTA AbhyasNTA Abhyas 2020Physical World, Units and Measurements

Solution:

$t=\frac{D_{1} - D_{2}}{2}=\frac{4 .23 - 3 .87}{2}=0.18\text{ cm}$
$\Delta t=\Delta D_{1}+\Delta D_{2}$
$=0.01+0.01=0.02 \, \text{cm}$
$\Rightarrow t=\left(\right. 0 .18 \pm 0 .02 \left.\right)\text{cm}$