A)
Type of fuel Energy produced (kJ) Amount taken P 55000 1 kg
B)
Type of fuel Energy produced (kJ) Amount taken Q 90000 2 kg
C)
Type of fuel Energy produced (kJ) Amount taken R 150000 1 kg
D)
Type of fuel Energy produced (kJ) Amount taken S 55000 3 kg
Correct Answer: C
Solution :
An efficient fuel is the one that produces a large amount of energy on burning. The efficiency of a fuel is determined by its calorific value, which is the amount of heat produced on complete combustion of 1 kg of fuel. Fuel R produces 150000 kJ of energy on its combustion of mass of 1 kg. Hence, its calorific value is 150000 kJ/kg, which is the highest among the given fuels. Hence, fuel R is the most efficient fuel. The correct answer is C.
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