$A$ device used to measure very high temperature is

Assertion $(A)$: Rapidly changing temperatures can be measured by thermocouples.
Reason $(R)$: The thermal capacity of the junction of a thermocouple is very small.

What is absolute zero temperature?

What is the slope of the line $AB$ in the given graph?

Write the relation between Celsius and Fahrenheit scales with a graph.

In the definition of 'calorie',one calorie is the heat required to raise the temperature of $1\ g$ of water through $1\ ^oC$ in a certain interval of temperature. The temperature interval is