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A hungry man weighing 80kg take quickly 20g lunch, and then climbs up a mountain making it to a height of 200m. If 60% of food energy was wasted as heat and the rest was used as climbing work. The fuel intake could have been any one of the following with given enthalpy of combustion?

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Olive oil 15kJ/g

Glucose 16kJ/g

Wheat bread 20kJ/g

Fructose syrup 13kJ /g

answer is B.

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Detailed Solution

Work done = $M \times a \times d i s p l a c e m e n t = 80 \times 9.8 \times 200 = 156.8 K J$
40% of total energy = 156.8 kJ
100% of total energy = $\frac{156 \times 100}{40} = 392 k J$

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