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JEE Main & Advanced AIEEE Solved Paper-2011

  • question_answer
    100 g of water is heated from \[{{30}^{o}}C\] to \[{{50}^{o}}C\]. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)   AIEEE  Solved  Paper-2011

    A) \[2.1\] kJ                                

    B) \[4.2\] kJ

    C) \[8.4\] kJ

    D) 84 kJ

    Correct Answer: C

    Solution :

                 \[Q=\Delta U+W\] As \[W=0\Rightarrow \Delta U=Q=4184\times \frac{100}{1000}\times 20\]                                    \[=8368\]                                    \[=8.368\,\,kJ\]                                    \[\approx 8.4\,\,kJ\]


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