Question:medium

A metal metre scale that is accurate up to 0.5 mm is made at a temperature of 25$^\circ$C. The range of temperatures within which it can be used is (Coefficient of linear expansion of the metal = $10^{-5}$ /$^\circ$C)

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The formula for linear expansion, $\Delta L = \alpha L_0 \Delta T$, gives the change in length. When dealing with "accuracy" or "error", this implies using the absolute value of the change, $|\Delta L|$, as the scale can be either too long (at higher temperatures) or too short (at lower temperatures).

Updated On: Mar 30, 2026

+25$^\circ$C to +75$^\circ$C
+25$^\circ$C to +50$^\circ$C
-25$^\circ$C to +75$^\circ$C
0$^\circ$C to +50$^\circ$C

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The Correct Option is C

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