320 Thermodynamics 13 A gas may expand either adiabatically

Last updated: 6/28/2023

320 Thermodynamics 13 A gas may expand either adiabatically or isothermally A number of P V curves are drawn for the two processes over different range of pressure and volume It will be found that 1 An adiabatic curve and an isothermal curve may intersect 2 Two adiabatic curves do not intersect 3 Two isothermal curves do not intersect 4 All of these 14 The variation of pressure P with volume V for an ideal monatomic gas during an adiabatic process is shown in figure At point A the magnitude of rate of change of pressure with volume is 3 3 P 5 3 Po 2 3 P O 2 V 2 1 Monatomic 2 Diatomic 4 5 P 3 5 P 2 15 Figure shows the adiabatic curve on a log 7 and log V scale performed on ideal gas The gas is log T4 5 4 3 3 Polyatomic 4 Mixture of monatomic and diatomic 16 A cyclic process on an ideal monatomic gas is shown in figure The correct statement is Board Competitive Exams 1 Work done by gas in process AB is more than that in the process BC 2 Net heat energy has been supplied to the system 3 Temperature of the gas is maximum at state B 4 In process CA heat energy is absorbed by system 17 A diatomic gas undergoes a process represented by PV3 constant Choose the incorrect statement 1 The gas expands by absorbing heat from the surroundings 2 The gas cools down during expansion 3 The work done by surroundings during expansion of the gas is negative 4 None of these 18 If a gas is taken from A to C through B then heat absorbed by the gas is 8 J Heat absorbed by the gas in taking it from A to C directly is P kPa 20 10 A 200 400V cc 1 8 J 2 9 J 3 11 J 4 12 J 19 The process CD is shown in the diagram As system is taken from C to D what happens to the temperature of the system 3v 1 Temperature first decreases and then increases 2 Temperature first increases and then decreases 3 Temperature decreases continuous