What is the freezing point of water?

The graph between two temperature scales $P$ and $Q$ is shown in the figure. Between upper fixed point and lower fixed point there are $150$ equal divisions of scale $P$ and $100$ divisions on scale $Q$. The relationship for conversion between the two scales is given by :

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Convert $-40°\mathrm{F}$ into Celsius.

The vapour pressure vs. temperature curve for a solution solvent system is shown below.

The boiling point of the solvent is _____°C.

The temperature of an object is $60°\mathrm{C}.$ Its value in Fahrenheit scale is

What are the upper fixed points of the Celsius and the Fahrenheit scales?

What do you mean by 'upper fixed point'?

$20 °\mathrm{C}$

The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law:

$R=R_o\left[1+\alpha \left(T-T_o\right)\right]$
The resistance is $101.6 \Omega$ at the triple-point of water $273.16 \mathrm{K}$, and $165.5 \Omega$ at the normal melting point of lead $600.5 K$. What is the temperature when the resistance is $123.4 \Omega$?