How many fixed points does an absolute Kelvin scale have? Write their values.

$Assertion :$ In a pressure cooker,water is brought to a boil. The cooker is then removed from the stove. Now,upon removing the lid of the pressure cooker,the water starts boiling again.
$Reason :$ The impurities in water bring down its boiling point.

The temperature of a body is measured both in ${ }^{\circ} C$ and ${ }^{\circ} F$. $A$ graph is plotted with ${ }^{\circ} F$ on the $X$-axis and ${ }^{\circ} C$ on the $Y$-axis. Then,the cosine of the angle between the graph and the $X$-axis is

On the centigrade scale,the temperature of a body increases by $30$ degrees. The increase in temperature on the Fahrenheit scale is ..............

Which of the curves in the figure represents the relation between Celsius and Fahrenheit temperatures?

The temperature on the Celsius scale is $25^{\circ}C$. What is the corresponding temperature on the Fahrenheit scale in $^{\circ}F$?