JEE Main & Advanced Physics Thermodynamical Processes Question Bank

done First Law of Thermodynamics Total Questions - 48

• question_answer1)
  First law of thermnodynamics is given by                                                                                              [CPMT 1977, 91]
  A)
             \[dQ=dU+PdV\]                  done clear
  B)
             \[dQ=dU\times PdV\] done clear
  C)
             \[dQ=(dU+dV)\,P\]           done clear
  D)
             \[dQ=PdU+dV\] done clear
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• question_answer2)
  The internal energy of an ideal gas depends upon                                                                    [RPMT 1997; MP PMT 1999; CPMT 2003]
  A)
             Specific volume                   done clear
  B)
             Pressure done clear
  C)
             Temperature                        done clear
  D)
             Density done clear
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• question_answer3)
  In changing the state of thermodynamics from A to B state, the heat required is Q and the work done by the system is W. The change in its internal energy is [MP PMT 1986; AMU (Med.) 2001]
  A)
             Q + W                                       done clear
  B)
             Q ? W done clear
  C)
             Q    done clear
  D)
             \[\frac{Q-W}{2}\] done clear
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• question_answer4)
  Heat given to a system is 35 joules and work done by the system is 15 joules. The change in the internal energy of the system will be                                                     [MP PET/PMT 1988]
  A)
             ? 50 J                                        done clear
  B)
             20 J done clear
  C)
             30 J done clear
  D)
             50 J done clear
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• question_answer5)
    The temperature of an ideal gas is kept constant as it expands. The gas does external work. During this process, the internal energy of the gas                                     [MP PMT 1990]
  A)
             Decreases done clear
  B)
             Increases done clear
  C)
             Remains constant done clear
  D)
             Depends on the molecular motion done clear
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• question_answer6)
  The first law of thermodynamics is concerned with the conservation of [MP PMT 1987; CBSE PMT 1990, 92; AFMC 1997; CPMT 1999; BHU 1999; DCE 2000; BCECE 2003]
  A)
             Momentum                          done clear
  B)
             Energy done clear
  C)
             Mass                                        done clear
  D)
             Temperature done clear
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• question_answer7)
  A thermodynamic system goes from states (i) \[{{P}_{1}}\], V to \[2{{P}_{1}}\], V (ii) P, V to P, 2V. Then work done in the two cases is [MP PMT 1990]
  A)
             Zero, Zero                              done clear
  B)
             Zero, \[P{{V}_{1}}\] done clear
  C)
             \[P{{V}_{1}}\], Zero           done clear
  D)
             \[P{{V}_{1}},\ {{P}_{1}}{{V}_{1}}\] done clear
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• question_answer8)
  If the amount of heat given to a system be 35 joules and the amount of work  done by the system be \[-15\]joules, then the change in the internal energy of the system is                                 [MP PMT 1989]
  A)
             \[-50\] joules                        done clear
  B)
             20 joules done clear
  C)
             30 joules                                 done clear
  D)
             50 joules done clear
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• question_answer9)
  A system is given 300 calories of heat and it does 600 joules of work.  How much does the internal energy of the system change in this process (J = 4.18 joules/cal)                                                            [MP PET 1991]
  A)
             654 Joule                                 done clear
  B)
             156.5 Joule done clear
  C)
             ­­? 300 Joule                             done clear
  D)
             ? 528.2 Joule done clear
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• question_answer10)
  Work done on or by a gas, in general depends upon the 
  A)
             Initial state only done clear
  B)
             Final state only done clear
  C)
             Both initial and final states only done clear
  D)
             Initial state, final state and the path done clear
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• question_answer11)
  If R = universal gas constant, the amount of heat needed to raise the temperature of 2 mole of an ideal monoatomic gas from 273K to 373K when no work is done [MP PET 1990]
  A)
             100 R                                        done clear
  B)
             150 R done clear
  C)
             300 R                                        done clear
  D)
             500 R done clear
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• question_answer12)
  Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule  of work                                           [EAMCET 1984]
  A)
             7900 J                                       done clear
  B)
             8200 J done clear
  C)
             5600 J                                       done clear
  D)
             6400 J done clear
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• question_answer13)
  A system performs work \[\Delta W\] when an amount of heat is\[\Delta Q\] added to the system, the corresponding change in the internal energy is \[\Delta U\]. A unique function of the initial and final states (irrespective of the mode of change) is [CPMT 1981; J & KCET 2004]
  A)
             \[\Delta Q\]                           done clear
  B)
             \[\Delta W\] done clear
  C)
             \[\Delta U\] and \[\Delta Q\]                                            done clear
  D)
             \[\Delta U\] done clear
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• question_answer14)
  A container of volume \[1{{m}^{3}}\]is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vacuum. The whole system is thermally isolated from its surroundings. The partition is removed and the gas expands to occupy the whole volume of the container. Its temperature now would be                                                            [Manipal MEE 1995]
  A)
             300 K                                        done clear
  B)
             239 K done clear
  C)
             200 K                                        done clear
  D)
             100 K done clear
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• question_answer15)
  110 J of heat is added to a gaseous system, whose internal energy change is 40 J,  then the amount of external work done is    [CBSE PMT 1993; DPMT 1996, 03; AFMC 1999; JIPMER 2000; MH CET 2000; Pb. PMT 2003]
  A)
             150 J                                         done clear
  B)
             70 J done clear
  C)
             110 J                                         done clear
  D)
             40 J done clear
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• question_answer16)
  Which of the following is not thermodynamical function  [CBSE PMT 1993; CPMT 2001; DCE 1996; 2001]
  A)
             Enthalpy                                 done clear
  B)
             Work done done clear
  C)
             Gibb's energy                       done clear
  D)
             Internal energy done clear
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• question_answer17)
  When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is [AFMC 1998]
  A)
             166 cal                                     done clear
  B)
             333 cal done clear
  C)
             500 cal                                     done clear
  D)
             400 cal done clear
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• question_answer18)
  First law thermodynamics states that                    [KCET 1999]
  A)
             System can do work done clear
  B)
             System has temperature done clear
  C)
             System has pressure done clear
  D)
             Heat is a form of energy done clear
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• question_answer19)
  A thermo-dynamical system is changed from state \[({{P}_{1}},\,{{V}_{1}})\] to \[({{P}_{2}},\,{{V}_{2}})\] by two different process. The quantity which will remain same will be                                   [RPET 1999]
  A)
             \[\Delta \,Q\]                       done clear
  B)
             \[\Delta \,W\] done clear
  C)
             \[\Delta Q+\Delta W\]      done clear
  D)
             \[\Delta Q-\Delta W\] done clear
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• question_answer20)
  In thermodynamic process, 200 Joules of heat is given to a gas and 100 Joules of work is also done on it. The change in internal energy of the gas is                           [AMU (Engg.) 1999]
  A)
             100 J                                         done clear
  B)
             300 J done clear
  C)
             419 J                                         done clear
  D)
             24 J done clear
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• question_answer21)
  A perfect gas contained in a cylinder is kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas [MH CET 1999]
  A)
             Remains constant               done clear
  B)
             Becomes zero done clear
  C)
             Increases                                done clear
  D)
             Decreases done clear
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• question_answer22)
  If 150 J of heat is added to a system and the work done by the system is 110 J, then change in internal energy will be [AMU (Engg.) 1999; BHU 2000]
  A)
             260 J                                         done clear
  B)
             150 J done clear
  C)
             110 J                                         done clear
  D)
             40 J done clear
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• question_answer23)
  If \[\Delta Q\] and \[\Delta W\] represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as      [Roorkee 2000]
  A)
             \[\Delta Q=\Delta U+\Delta W\]                                      done clear
  B)
             \[\Delta Q=\Delta U-\Delta W\] done clear
  C)
             \[\Delta Q=\Delta W-\Delta U\]                                       done clear
  D)
             \[\Delta Q=-\Delta W-\Delta U\] where \[\Delta U\] is the internal energy done clear
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• question_answer24)
  For free expansion of the gas which of the following is true [AMU (Med.) 2000]
  A)
             \[Q=W=0\] and \[\Delta \,{{E}_{\operatorname{int}}}=0\] done clear
  B)
             \[Q=0,\,W>0\] and \[\Delta {{E}_{\operatorname{int}}}=-W\] done clear
  C)
             \[W=0,\,Q>0,\] and \[\Delta \,{{E}_{\operatorname{int}}}=Q\] done clear
  D)
             \[W>0,\,Q<0\] and \[\Delta {{E}_{\operatorname{int}}}=0\] done clear
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• question_answer25)
  Which of the following can not determine the state of a thermodynamic system                                               [AFMC 2001]
  A)
             Pressure and volume done clear
  B)
             Volume and temperature done clear
  C)
             Temperature and pressure done clear
  D)
             Any one of pressure, volume or temperature done clear
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• question_answer26)
  Which of the following is not a thermodynamics co-ordinate       [AIIMS 2001]
  A)
             P     done clear
  B)
             T done clear
  C)
             V     done clear
  D)
             R done clear
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• question_answer27)
  In a given process for an ideal gas, \[dW=0\]and \[dQ<0.\] Then for the gas                         [IIT-JEE (Screening) 2001]
  A)
             The temperature will decrease done clear
  B)
             The volume will increase done clear
  C)
             The pressure will remain constant done clear
  D)
             The temperature will increase done clear
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• question_answer28)
  The specific heat of hydrogen gas at constant pressure is \[{{C}_{P}}=3.4\times {{10}^{3}}cal/kg{{\,}^{o}}C\] and at constant volume is \[{{C}_{V}}=2.4\times {{10}^{3}}cal/kg{{\,}^{o}}C.\]If one kilogram hydrogen gas is heated from \[{{10}^{o}}C\] to \[{{20}^{o}}C\] at constant pressure, the external work done on the gas to maintain it at constant pressure is                                               [MP PMT 1995; DPMT 2001]
  A)
             \[{{10}^{5}}\,\]cal               done clear
  B)
             \[{{10}^{4}}\]cal done clear
  C)
             \[{{10}^{3}}\] cal                 done clear
  D)
             \[5\times {{10}^{3}}\]cal done clear
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• question_answer29)
  Which of the following parameters does not characterize the thermodynamic state of matter [CPMT 2001; AIEEE 2003]
  A)
             Volume                                   done clear
  B)
             Temperature done clear
  C)
             Pressure                                 done clear
  D)
             Work done clear
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• question_answer30)
  In a thermodynamic system working substance is ideal gas, its internal energy is in the form of  [MP PMT 2003]
  A)
             Kinetic energy only            done clear
  B)
             Kinetic and potential energy done clear
  C)
             Potential energy                 done clear
  D)
             None of these done clear
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• question_answer31)
  Which of the following statements is correct for any thermodynamic system                                      [AIEEE 2004]
  A)
             The internal energy changes in all processes done clear
  B)
             Internal energy and entropy are state functions done clear
  C)
             The change in entropy can never be zero done clear
  D)
             The work done in an adiabatic process is always zero done clear
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• question_answer32)
  A system is provided with 200 cal of heat and the work done by the system on the surrounding is 40 J. Then its internal energy                                                        [Orissa PMT 2004]
  A)
             Increases by 600 J               done clear
  B)
             Decreases by 800 J done clear
  C)
             Increases by 800 J               done clear
  D)
             Decreases by 50 J done clear
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• question_answer33)
  In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out 20 J of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be                                                [DPMT 2004]
  A)
             30 J done clear
  B)
             20 J done clear
  C)
             60 J done clear
  D)
             40 J done clear
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• question_answer34)
  Heat is not being exchanged in a body. If its internal energy is increased, then                                    [RPMT 2002]
  A)
             Its temperature will increase done clear
  B)
             Its temperature will decrease done clear
  C)
             Its temperature will remain constant done clear
  D)
             None of these done clear
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• question_answer35)
  Out of the following which quantity does not depend on path                                    [RPET 2002]
  A)
             Temperature                        done clear
  B)
             Energy done clear
  C)
             Work                                        done clear
  D)
             None of these done clear
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• question_answer36)
   First law of thermodynamics is a special case of [CPMT 1985; RPET 2000; DCE 2000; CBSE PMT 2000; AIEEE 2002; AFMC 2002]
  A)
             Newton's law                       done clear
  B)
             Law of conservation of energy done clear
  C)
             Charle's law done clear
  D)
             Law of heat exchange done clear
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• question_answer37)
  One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from \[{{0}^{o}}C\] to \[{{100}^{o}}C\]. Then the change in the internal energy is           [Pb. PMT 2001]
  A)
             6.56 joules                              done clear
  B)
             \[8.32\times {{10}^{2}}\]joules done clear
  C)
             \[12.48\times {{10}^{2}}\]joules                                       done clear
  D)
             20.80 joules done clear
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• question_answer38)
  If the ratio of specific heat of a gas at constant pressure to that at constant volume is \[\gamma \], the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is                                                  [CBSE PMT 1998]
  A)
             \[R/(\gamma -1)\]              done clear
  B)
             \[pV\] done clear
  C)
             \[pV/(\gamma -1)\]           done clear
  D)
             \[\gamma pV/(\gamma -1)\] done clear
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• question_answer39)
  If \[{{C}_{V}}=4.96cal/mole\] K, then increase in internal energy when temperature of 2 moles of this gas is increased from  340 K to 342 K                                                       [RPET 1997]
  A)
              27.80 cal                                 done clear
  B)
             19.84 cal done clear
  C)
             13.90 cal                                  done clear
  D)
             9.92 cal done clear
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• question_answer40)
  Temperature is a measurement of coldness or hotness of an object. This definition is based on                 [RPET 2003]
  A)
             Zeroth law of thermodynamics done clear
  B)
             First law of thermodynamics done clear
  C)
             Second law of thermodynamics done clear
  D)
             Newton's law of cooling done clear
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• question_answer41)
  When heat energy of 1500 Joules, is supplied to a gas at constant pressure \[2.1\times {{10}^{5}}N/{{m}^{2}}\], there was an increase in its volume equal to \[2.5\times {{10}^{-3}}{{m}^{3}}\]. The increase in internal energy of the gas in Joules is [EAMCET (Engg.) 1999]
  A)
             450                                            done clear
  B)
             525 done clear
  C)
             975 done clear
  D)
             2025 done clear
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• question_answer42)
  If heat given to a system is 6 kcal and work done is 6 kJ. Then change in internal energy is             [BHU Med. 2000]
  A)
             19.1 kJ                                      done clear
  B)
             12.5 kJ done clear
  C)
             25 kJ                                         done clear
  D)
             Zero done clear
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• question_answer43)
  In a thermodynamics process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8J of work is done on the gas. If the initial internal energy of the gas was 30J. The final internal energy will be                                                                 [DPMT 2002]
  A)
             18J                                            done clear
  B)
              9J done clear
  C)
             4.5J                                           done clear
  D)
             36J done clear
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• question_answer44)
  A monoatomic gas of n-moles is heated from temperature T1 to T2 under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is                                                [CPMT 2000]
  A)
             More for (i)                           done clear
  B)
             More for (ii) done clear
  C)
             Same in both cases            done clear
  D)
             Independent of number of moles done clear
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• question_answer45)
  The state of a thermodynamic system is represented by [MH CET 2004]
  A)
             Pressure only  done clear
  B)
             Volume only done clear
  C)
             Pressure, volume and temperature done clear
  D)
             Number of moles               done clear
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• question_answer46)
  A perfect gas goes from state A to another state B by absorbing \[8\times {{10}^{5}}J\] of heat and doing \[6.5\times {{10}^{5}}J\] of external work. It is now transferred between the same two states in another process in which it absorbs \[{{10}^{5}}J\] of heat. Then in the second process                                         [BHU 1997]
  A)
             Work done on the gas is \[0.5\times {{10}^{5}}J\] done clear
  B)
              Work done by gas is \[0.5\times {{10}^{5}}J\] done clear
  C)
             Work done on gas is \[{{10}^{5}}J\] done clear
  D)
             Work done by gas is \[{{10}^{5}}J\] done clear
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• question_answer47)
  If a system undergoes contraction of volume then the work done by the system will be                                [BHU 1999]
  A)
             Zero                                          done clear
  B)
              Negligible done clear
  C)
             Negative                                 done clear
  D)
              Positive done clear
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• question_answer48)
  Which of the following is incorrect regarding the first law of thermodynamics                                      [AIEEE 2005]
  A)
             It introduces the concept of the internal energy      done clear
  B)
             It introduces the concept of the entropy done clear
  C)
             It is not applicable to any cyclic process  done clear
  D)
             None of the above done clear
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