JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Conservation of Energy and Momentum

  • question_answer
    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                                              [AMU (Med.) 2000]

    A)                 \[0.81\,kWh\]   

    B)                 \[0.90\,kWh\]

    C)                 \[1.11kWh\]

    D)                    \[0.71\,kWh\]

    Correct Answer: A

    Solution :

                        \[1\,kcal={{10}^{3}}\,Calorie=4200\,J\]   \[=\frac{4200}{3.6\times {{10}^{6}}}{{K}_{w}}h\]                 \ \[700\,kcal=\frac{700\times 4200}{3.6\times {{10}^{6}}}kWh=0.81\,kWh\]


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