At what temperature are the centigrade (Celsius) and Fahrenheit readings the same?

No other thermometer is as suitable as a platinum resistance thermometer to measure temperature in the entire range of

The temperature of a body on the Kelvin scale is found to be $x \ K$. When it is measured by a Fahrenheit thermometer,it is found to be $x \ ^\circ F$. Then the value of $x$ is:

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

The temperature of the hot junction of a thermocouple is increased from $80\,\,^{\circ}\text{C}$ to $100\,\,^{\circ}\text{C}$. The percentage change in the thermoelectric power will be ............ $\%$.

$A$ thermometer graduated according to a linear scale reads a value $x_0$ when in contact with boiling water,and $x_0/3$ when in contact with ice. What is the temperature of an object in ${}^oC$,if this thermometer in contact with the object reads $x_0/2$?