Two thermometers are constructed in the same way except that one has a spherical bulb and the other a cylindrical bulb; which one will respond quickly to temperature changes ?

the flow of heat is proportional to the area of cross section.we know that,the surface area of a cylindrical bulbis more than that of spherical surface.therefore,the thermometer with cylindrical bulb responds more quickly to temperature change than the thermometer with spherical bulb.