List of top Physics Questions on Thermal Expansion asked in AP EAPCET

An iron sphere having diameter \(D\) and mass \(M\) is immersed in hot water so that the temperature of the sphere increases by \(\delta T\). If \(\alpha\) is the coefficient of linear expansion of the iron then the change in the surface area of the sphere is

A metal tape is calibrated at \(25^\circ C\). On a cold day when the temperature is \(-15^\circ C\), the percentage error in the measurement of length is
Coefficient of linear expansion of metal \(=1\times10^{-5}\;^\circ C^{-1}\)