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

At what temperature in $^oC$ is the density of water maximum?

The pressure of a gas filled in the bulb of a constant volume gas thermometer at temperatures $0^{\circ} C$ and $100^{\circ} C$ are $27.50 \, cm$ and $37.50 \, cm$ of $Hg$ respectively. At an unknown temperature,the pressure is $32.45 \, cm$ of $Hg$. The unknown temperature is ........ $^{\circ} C$.

Is negative temperature possible on the Kelvin scale? Why?

Explain the study of thermal properties of matter by giving definitions of temperature and heat.

$A$ faulty thermometer reads $5^{\circ}C$ in melting ice and $95^{\circ}C$ in steam. The correct temperature on the absolute scale will be $.........K$ when the faulty thermometer reads $41^{\circ}C$.