Question

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

Answer 1

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

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

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.