KVPY Sample Paper KVPY Stream-SX Model Paper-21

  • question_answer
    During the process A-B for an ideal gas-

    A) Work done on the gas is zero

    B) Density of the gas is constant

    C) Slope of line AB from the T-axis is directly proportional to the number of moles of the gas

    D) All of the above

    Correct Answer: D

    Solution :

    P-T graph is a straight line passing through the origin.
    Therefore V = constant
    Work done on the gas,
    Further, density of the gas, \[\rho =\frac{m}{V}\]
    \[\therefore \rho \propto \frac{1}{V}\]
    Since Volume of the gas is constant, density of the gas is constant.
    \[p=\left( \frac{nR}{V} \right)T\]
    i.e., slope of P-T line is proportional to n.

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