Question

The unit of heat in SI is joules
(A) True
(B) False

Answer 1

Hint: To find the unit of heat in SI system we use the formula $Q = mc\Delta t$
Where Q = heat
m = mass of substance
c = specific heat
$\Delta T$ = temperature difference .

Complete step by step solution:
Heat is the form of energy and in the SI unit system, all forms of energy are measured in terms of joules.
So, SI unit of heat is also joules 4.184 joules of heat energy is necessary to increase the temperature of a unit mass of water by $1^\circ C$
Numerically heat is represented by the symbol Q and formula is given as
$Q = mc\Delta T$

So the answer is True.

Note: The SI unit of heat is Joules. In other heat units like in the CGS system, heat is expressed in the unit of calories which is heat energy needed to increase the temperature of 1 gm of water by $1^\circ C$.
In many numerical the relation between Joules and Calories is used which is given as $1cal = 4.184J$