NEET Sample Paper NEET Sample Test Paper-16

  • question_answer 14) 100 g of water is heated from Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J Kg/K)

    A) 4.2 kJ              

    B) 8.4 kJ  

    C) 84 kJ              

    D) 2.1 kJ              

    Correct Answer: B

    Solution :

    \[\Delta Q=MS\Delta T=100\times {{10}^{-3}}\times 4184\times 20=8.4\times {{10}^{3}}\] \[\Delta Q=84\,kJ\]and \[\Delta W=0\] \[\Delta Q=\Delta U+\Delta W\Rightarrow \Delta U=8.4\,kJ\] Hence, the correction option is (b).

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