On which of the following temperature scales is the temperature never negative?

The triple points of neon and carbon dioxide are $24.57\; K$ and $216.55\; K$ respectively. Express these temperatures on the Celsius and Fahrenheit scales.

Oxygen boils at $-183^{\circ}C$. This temperature is approximately ....... $^{\circ}F$.

$A$ device used to measure very high temperature is

The resistance of a thermometer is $100 \Omega$ at the triple point of water $(273 \ K)$ and is $300 \Omega$ at the melting point of gold $(873 \ K)$. The temperature at which the resistance of the thermometer is $200 \Omega$ is: (in $K$)

Maximum density of $H_2O$ is at the temperature