Question

Which of the following will produce more heat?
1. $3kg$ of fuel X (Calorific value $=12000J/kg$)
2. $4kg$ of fuel Y (Calorific value $=10000J/kg$)

• A. Fuel X
• B. Fuel Y
• C. Both will be equal
• D. Insufficient information

Answer 1

The correct option is B Fuel Y

For X,
Total heat produced will be:
$E_X=3\times 12000=36000J$

For Y,
Total heat produced will be:
$E_Y=4\times 10000=40000J$

Hence, total heat produced by 4 kg of fuel Y will be more.