21. Initial pressure and volume of a gas are P and V respectively. First it is expanded isothermally to volume 4V and then compressed adiabatically to volume V. The final pressure of gas will be
(a) 1P (b) 2P
(c) 4P (d) 8P
Answer-b
(5)
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10. In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are
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(a) BA, AD, DC (b) DC, CB, BA (c) AB, BC, CD (d) CD, DA, AB Explanation-(d) Process CD is isochoric as volume is constant, Process DA is isothermal as temperature constant and Process AB is isobaric as pressure is …