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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100 W through a current of 1A for 5 min then change in internal energy is  [IIT-JEE (Screening) 2005]

    A)            0 kJ

    B)            10 kJ

    C)            20 kJ                                        

    D)            30 kJ

    Correct Answer: D

    Solution :

                       Volume of the ideal gas is constant so \[W=P\Delta V=0\] using FLOT \[\Delta Q=\Delta U\]Þ \[\Delta U={{i}^{2}}Rt\]\[={{1}^{2}}\times 100\times 5\times 60\] \[=30\times {{10}^{3}}=30KJ\]


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