Question

One megajoule approximately equals
a) 240 kcal
b) 2400 kcal
c) 24 kcal
d) 2.4 kcal

Answer 1

Hint: We need to find the value of One megajoule in calories.
We know that:
$\begin{align}
  & 1J=0.24cal \\
 & 1MJ={{10}^{6}}J \\
\end{align}$
Use the given relation to find the value of One mega joule in calories.

Complete step by step answer:
As we have:
$\begin{align}
  & 1J=0.24cal \\
 & 1MJ={{10}^{6}}J \\
\end{align}$
So, value One mega joule in calorie is:
$\begin{align}
  & 1MJ={{10}^{6}}\times 0.24 \\
 & =240\times {{10}^{3}}cal \\
 & =240kcal
\end{align}$

So, the correct answer is “Option A”.

Note:
Joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.
A calorie is the amount of heat needed to raise the temperature of one gram of water by one degree Celsius.