Maximum density of $H_2O$ is at the temperature

$A$ uniform thermometer scale is at steady state with its $0 \, cm$ mark at $20^{\circ} C$ and $100 \, cm$ mark at $100^{\circ} C$. The temperature of the $60 \, cm$ mark is ............. $^{\circ} C$.

$A$ Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers $140\,^{\circ}F$. What is the fall in temperature as registered by the centigrade thermometer?

$A$ thermoelectric thermometer is based on:

In anomalous expansion of water, at what temperature is the density of water maximum?

Recently,the phenomenon of superconductivity has been observed at $95\, K$. This temperature is nearly equal to ......... $^oF$.