Question

How closely must the temperature be controlled so that it does not gain or lose more than second in a day?

• A. $\pm {0.2}^{o}C$
• B. $\pm {0.1}^{o}C$
• C. $\pm 1^{o}C$
• D. $\pm 2^{o}C$

Answer 1

The correct option is D $\pm 2^{o}C$

Change in temperature $\Delta T=1=\frac{\alpha \Delta \theta T}{2}$
or $\Delta \theta =\frac{2}{1.2\times {10}^{-5}\times 24\times 3600}=2^{0}C$
$\Delta \theta =\pm 2^{0}C$