Q. An ice cream has a marked value of $700\ kcal$. How many kilowatt - hour of energy will it deliver to the body as it is digested
A) $0.81\ kWh$
B) $0.90\ kWh$
C) $1.11\ kWh$
D) $0.71\ kWh$
Explanation
(a) $1\ kcal = 10^{3}\ Calorie = 4200\ J = \frac{4200}{3.6 \times 10^{6}}kWh$
$\therefore 700\ kcal = \frac{700 \times 4200}{3.6 \times 10^{6}}kWh = 0.81kWh$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.