JEE Main & Advanced Physics Thermodynamical Processes Question Bank

done Graphical Questions Total Questions - 44

• question_answer1)
  A system goes from A to B via two processes I and II as shown in figure. If \[\Delta {{U}_{1}}\] and \[\Delta {{U}_{2}}\] are the changes in internal energies in the processes I and II respectively, then [AIEEE 2005]           
  A)
             \[\Delta {{U}_{\text{II}}}>\Delta {{U}_{\text{I}}}\] done clear
  B)
             \[\Delta {{U}_{\text{II}}}<\Delta {{U}_{\text{I}}}\] done clear
  C)
             \[\Delta {{U}_{\text{I}}}=\Delta {{U}_{\text{II}}}\] done clear
  D)
             Relation between \[\Delta {{U}_{\text{I}}}\] and \[\Delta {{U}_{\text{II}}}\] can not be determined done clear
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• question_answer2)
  A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is                     [Orissa JEE 2002]
  A)
             20 J done clear
  B)
             ? 20 J                                        done clear
  C)
             400 J                                                 done clear
  D)
             ? 374 J done clear
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• question_answer3)
  An ideal gas is taken around ABCA as shown in the above P-V diagram. The work done during a cycle is [KCET 2001]
  A)
             2PV done clear
  B)
             PV done clear
  C)
             1/2PV done clear
  D)
             Zero done clear
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• question_answer4)
  The P-V diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value                       [AMU (Engg.) 2000]
  A)
             ac done clear
  B)
             cg done clear
  C)
             af done clear
  D)
             cd done clear
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• question_answer5)
  An ideal gas of mass m in a state A goes to another state B via three different processes as shown in figure. If \[{{Q}_{1}},\,{{Q}_{2}}\] and \[{{Q}_{3}}\] denote the heat absorbed by the gas along the three paths, then                                                                          [MP PET 1992]
  A)
             \[{{Q}_{1}}<{{Q}_{2}}<{{Q}_{3}}\] done clear
  B)
             \[{{Q}_{1}}<{{Q}_{2}}={{Q}_{3}}\] done clear
  C)
             \[{{Q}_{1}}={{Q}_{2}}>{{Q}_{3}}\] done clear
  D)
             \[{{Q}_{1}}>{{Q}_{2}}>{{Q}_{3}}\] done clear
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• question_answer6)
  Which of the following graphs correctly represents the variation of \[\beta =-(dV/dP)/V\] with P for an ideal gas at constant temperature                              [IIT-JEE (Screening) 2002]
  A)
                              done clear
  B)
                               done clear
  C)
                             done clear
  D)
                      done clear
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• question_answer7)
  A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : \[{{P}_{A}}=3\times {{10}^{4}}Pa,\ {{P}_{B}}=8\times {{10}^{4}}Pa\]   and   \[{{V}_{A}}=2\times {{10}^{-3}}{{m}^{3}},\ {{V}_{D}}=5\times {{10}^{-3}}{{m}^{3}}\]            In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be                                                                [CBSE PMT 1992]
  A)
             560 J done clear
  B)
             800 J done clear
  C)
             600 J done clear
  D)
             640 J done clear
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• question_answer8)
  P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to  [IIT-JEE (Screening) 2001]
  A)
             He and \[{{O}_{2}}\] done clear
  B)
             \[{{O}_{2}}\] and He done clear
  C)
             He and Ar done clear
  D)
             \[{{O}_{2}}\] and \[{{N}_{2}}\] done clear
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• question_answer9)
  Four curves A, B, C and D are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are [CPMT 1986; UPSEAT 1999]
  A)
             C and D respectively done clear
  B)
             D and C respectively done clear
  C)
             A and B respectively done clear
  D)
             B and A respectively done clear
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• question_answer10)
  In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are [Manipal MEE 1995]
  A)
             BA, AD, DC done clear
  B)
             DC, CB, BA       done clear
  C)
             AB, BC, CD done clear
  D)
             CD, DA, AB done clear
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• question_answer11)
  The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A ® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is                                                                       [UPSEAT 2002]
  A)
             34 J done clear
  B)
             70 J                                            done clear
  C)
             84 J                                            done clear
  D)
             134 J done clear
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• question_answer12)
  An ideal gas is taken through the cycle A ® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C ® A is                                [IIT-JEE (Screening) 2002; RPMT 2004]
  A)
             ? 5 J done clear
  B)
             ? 10 J done clear
  C)
             ? 15 J done clear
  D)
             ? 20 J done clear
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• question_answer13)
  In the following indicator diagram, the net amount of work done will be
  A)
             Positive done clear
  B)
             Negative                                 done clear
  C)
             Zero done clear
  D)
             Infinity done clear
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• question_answer14)
  A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done in AB, BC and CA respectively
  A)
             \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{1}}}{{{V}_{2}}} \right)\,,\,R\,({{T}_{1}}-{{T}_{2}})\]        done clear
  B)
             \[R({{T}_{1}}-{{T}_{2}}),\,0,\,R{{T}_{1}}\ln \frac{{{V}_{1}}}{{{V}_{2}}}\]        done clear
  C)
             \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)\,,\,R\,({{T}_{1}}-{{T}_{2}})\] done clear
  D)
             \[0,\,R{{T}_{2}}\ln \left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)\,,\,R\,({{T}_{2}}-{{T}_{1}})\] done clear
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• question_answer15)
  A cyclic process ABCD is shown in the figure P-V diagram. Which of the following curves represent the same process
  A)
                                    done clear
  B)
                           done clear
  C)
                                    done clear
  D)
    done clear
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• question_answer16)
             Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram            Consider the following statements            I.     Area ABCD = Work done on the gas            II.    Area ABCD = Net heat absorbed            III.  Change in the internal energy in cycle = 0            Which of these are correct                                                               [AMU (Med.) 2001]             
  A)
             I only                                        done clear
  B)
             II only                                       done clear
  C)
             II and III                                   done clear
  D)
             I, II and III done clear
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• question_answer17)
  The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is [AIEEE 2005]
  A)
             \[1/3\]       done clear
  B)
             \[2/3\]       done clear
  C)
             \[1/2\] done clear
  D)
             \[1/4\] done clear
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• question_answer18)
  Work done in the given P-V diagram in the cyclic process is [UPSEAT 1998; RPET 2000; Kerala PMT 2002]
  A)
              PV done clear
  B)
              2PV done clear
  C)
              PV/2 done clear
  D)
             3PV done clear
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• question_answer19)
  A cyclic process ABCA is shown in the V-T diagram. Process on the P-V diagram is
  A)
                               done clear
  B)
                        done clear
  C)
                               done clear
  D)
                        done clear
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• question_answer20)
  In the figure given two processes A and B are shown by which a thermo-dynamical system goes from initial to final state F. If \[\Delta {{Q}_{A}}\] and \[\Delta {{Q}_{B}}\] are respectively the heats supplied to the systems then                                                                    [RPET 1999]
  A)
             \[\Delta {{Q}_{A}}=\Delta {{Q}_{B}}\] done clear
  B)
             \[\Delta {{Q}_{A}}\ge \Delta {{Q}_{B}}\] done clear
  C)
             \[\Delta {{Q}_{A}}<\Delta {{Q}_{B}}\] done clear
  D)
             \[\Delta {{Q}_{A}}>\Delta {{Q}_{B}}\] done clear
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• question_answer21)
  In the cyclic process shown in the figure, the work done by the gas in one cycle is                                                [MP PMT 1999]
  A)
             \[28\,{{P}_{1}}{{V}_{1}}\] done clear
  B)
             \[14\,{{P}_{1}}{{V}_{1}}\] done clear
  C)
             \[18\,{{P}_{1}}{{V}_{1}}\] done clear
  D)
             \[9\,{{P}_{1}}{{V}_{1}}\] done clear
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• question_answer22)
  An ideal gas is taken around the cycle ABCA as shown in the P-V diagram. The net work done by the gas during the cycle is equal to                                                              [CPMT 1991]
  A)
             \[12\,{{P}_{1}}{{V}_{1}}\] done clear
  B)
             \[6\,{{P}_{1}}{{V}_{1}}\] done clear
  C)
             \[3\,{{P}_{1}}{{V}_{1}}\] done clear
  D)
             \[2{{P}_{1}}{{V}_{1}}\] done clear
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• question_answer23)
  Heat energy absorbed by a system in going through a cyclic process shown in figure is    [AIIMS 1995; BHU 2002]
  A)
             107 p J done clear
  B)
             104 p J done clear
  C)
             102p J done clear
  D)
             \[{{10}^{-3}}\,\pi J\] done clear
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• question_answer24)
  A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown in the PV diagram. The net work done during the complete cycle is given by the area                                            [CBSE PMT 1992]
  A)
             P1ACBP2P1 done clear
  B)
             ACBB'A'A done clear
  C)
             ACBDA done clear
  D)
             ADBB'A'A done clear
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• question_answer25)
  In the diagrams (i) to (iv) of variation of volume with changing pressure is shown. A gas is taken along the path ABCD. The change in internal energy of the gas will be [CPMT 1986, 88]
  A)
             Positive in all cases (i) to (iv)  done clear
  B)
             Positive in cases (i), (ii) and (iii) but zero in (iv) case done clear
  C)
             Negative in cases (i), (ii) and (iii) but zero in (iv) case done clear
  D)
             Zero in all four cases done clear
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• question_answer26)
  A system is taken through a cyclic process represented by a circle as shown. The heat absorbed by the system is
  A)
              \[\pi \times {{10}^{3}}J\] done clear
  B)
              \[\frac{\pi }{2}J\] done clear
  C)
              \[4\pi \times {{10}^{2}}J\] done clear
  D)
              \[\pi \,J\] done clear
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• question_answer27)
  A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system is
  A)
              \[{{P}_{0}}{{V}_{0}}\] done clear
  B)
              \[2{{P}_{0}}{{V}_{0}}\] done clear
  C)
              \[\frac{{{P}_{0}}{{V}_{0}}}{2}\] done clear
  D)
             Zero done clear
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• question_answer28)
  The P-V graph of an ideal gas cycle is shown here as below. The adiabatic process is described by    [CPMT 1985; UPSEAT 2003]
  A)
             AB and BC done clear
  B)
             AB and CD done clear
  C)
             BC and DA done clear
  D)
             BC and CD done clear
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• question_answer29)
  An ideal monoatomic gas is taken round the cycle ABCDA as shown in following P-V diagram. The work done during the cycle is                                      [IIT 1983; CPMT 1990; AMU 1995]
  A)
             PV  done clear
  B)
             2 PV done clear
  C)
             4 PV                                          done clear
  D)
             Zero done clear
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• question_answer30)
  A system changes from the state \[({{P}_{1}},\ {{V}_{1}})\] to \[({{P}_{2}}{{V}_{2}})\] as shown in the figure.  What is the work done by the system                                                                       [CPMT 1981]
  A)
             \[7.5\times {{10}^{5}}\ joule\]                                          done clear
  B)
             \[7.5\times {{10}^{5}}\ erg\] done clear
  C)
             \[12\times {{10}^{5}}\ joule\] done clear
  D)
             \[6\times {{10}^{5}}\ joule\] done clear
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• question_answer31)
  Carbon monoxide is carried around a closed cycle abc in which bc is an isothermal process as shown in the figure. The gas absorbs 7000 J of heat as its temperature increases from 300 K to 1000 K in going from a to b. The quantity of heat rejected by the gas during the process ca is [SCRA 1994]
  A)
             4200 J                                       done clear
  B)
             5000 J done clear
  C)
             9000 J                                       done clear
  D)
             9800 J done clear
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• question_answer32)
  A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is                                                [BHU 1994; KCET 2003]
  A)
             Zero                                          done clear
  B)
             3 PV done clear
  C)
             6 PV                                          done clear
  D)
             9PV done clear
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• question_answer33)
  When a system is taken from state i to a state f along path iaf, \[Q=50\,J\] and \[W=20J.\] Along path ibf, \[Q=35J.\] If \[W=-13J\] for the curved return path f i,  Q for this path is          [AMU (Med.) 2000]
  A)
             33 J done clear
  B)
             23 J done clear
  C)
             ? 7 J                                          done clear
  D)
             ? 43 J done clear
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• question_answer34)
  For one complete cycle of a thermodynamic process on a gas as shown in the P-V diagram, Which of following is correct                                                                      [AMU (Engg.) 2000]
  A)
             \[\Delta {{E}_{\operatorname{int}}}=0,\,Q<O\] done clear
  B)
             \[\Delta {{E}_{\operatorname{int}}}=0,\,Q>0\] done clear
  C)
             \[\Delta \,{{E}_{\operatorname{int}}}>0,\,Q<0\]     done clear
  D)
             \[\Delta \,{{E}_{\operatorname{int}}}<0,\,Q>\,0\] done clear
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• question_answer35)
  An ideal gas is taken around ABCA as shown in the above P-V diagram. The work done during a cycle is                                                                                            [UPSEAT 2001]
  A)
             Zero done clear
  B)
             \[\frac{1}{2}PV\] done clear
  C)
             2 PV done clear
  D)
             PV done clear
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• question_answer36)
  An ideal gas is taken from point A to the point B, as shown in the P-V diagram, keeping the temperature constant. The work done in the process is                                   [UPSEAT 2005]
  A)
             \[({{P}_{A}}-{{P}_{B}})({{V}_{B}}-{{V}_{A}})\]            done clear
  B)
             \[\frac{1}{2}({{P}_{B}}-{{P}_{A}})({{V}_{B}}+{{V}_{A}})\] done clear
  C)
             \[\frac{1}{2}({{P}_{B}}-{{P}_{A}})({{V}_{B}}-{{V}_{A}})\]     done clear
  D)
             \[\frac{1}{2}({{P}_{B}}+{{P}_{A}})({{V}_{B}}-{{V}_{A}})\] done clear
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• question_answer37)
  The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from \[A\to B\to C\]is 30J and 40J heat is given to the system. The change in internal energy between A and C is                                                                          [BCECE 2005]
  A)
             10 J done clear
  B)
             70 J done clear
  C)
             84 J done clear
  D)
             134 J done clear
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• question_answer38)
  Consider a process shown in the figure. During this process the work done by the system
  A)
             Continuously increases done clear
  B)
             Continuously decreases done clear
  C)
             First increases, then decreases done clear
  D)
             First decreases, then increases done clear
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• question_answer39)
  Six moles of an ideal gas perfomrs a cycle shown in figure. If the temperature are TA = 600 K, TB = 800 K, TC­ = 2200 K and TD = 1200 K, the work done per cycle is [BCECE 2005]
  A)
             20 kJ done clear
  B)
             30 kJ done clear
  C)
             40 kJ done clear
  D)
             60 kJ done clear
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• question_answer40)
  Which of the accompanying PV, diagrams best represents an isothermal process                                              [MP PET 2005]
  A)
                                   done clear
  B)
                            done clear
  C)
                                   done clear
  D)
                          done clear
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• question_answer41)
  In the following figure, four curves A, B, C and D are shown. The curves are                                         [DCE 2003]
  A)
             Isothermal for A and D while adiabatic for B and C done clear
  B)
             Adiabatic for A and C while isothermal for B and D done clear
  C)
             Isothermal for A and B while adiabatic for C and D done clear
  D)
             Isothermal for A and C while adiabatic for B and D done clear
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• question_answer42)
  P-V diagram of a cyclic process ABCA is as shown in figure. Choose the correct statement
  A)
             \[\Delta {{Q}_{A\to B}}\]= negative done clear
  B)
             \[\Delta {{U}_{B\to C}}\]= positive done clear
  C)
             \[\Delta {{W}_{CAB}}\]= negative done clear
  D)
             All of these done clear
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• question_answer43)
  A sample of an ideal gas is taken through a cycle a shown in figure. It absorbs 50J of energy during the process AB, no heat during BC, rejects 70J during CA. 40J of work is done on the gas during BC. Internal energy of gas at A is 1500J, the internal energy at C would be
  A)
             1590 J done clear
  B)
             1620 J done clear
  C)
             1540 J done clear
  D)
             1570 J done clear
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• question_answer44)
  In the following P-V diagram two adiabatics cut two isothermals at temperatures T1 and T2 (fig.). The value of \[\frac{{{V}_{a}}}{{{V}_{d}}}\] will be 
  A)
             \[\frac{{{V}_{b}}}{{{V}_{c}}}\]                                           done clear
  B)
             \[\frac{{{V}_{c}}}{{{V}_{b}}}\] done clear
  C)
             \[\frac{{{V}_{d}}}{{{V}_{a}}}\]                                           done clear
  D)
             \[{{V}_{b}}{{V}_{c}}\] done clear
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