369317
The volume of a gas decreases from \(500 \mathrm{cc}\) to \(300 \mathrm{cc}\) when a sample of gas is compressed by an average pressure of \(0.6 \mathrm{~atm}\). During this process \(10 \mathrm{~J}\) of heat is liberated. The change in internal energy is
1 \(-2.16 \mathrm{~J}\)
2 \(12.156 \mathrm{~J}\)
3 \(2.16 \mathrm{~J}\)
4 \(101.3 \mathrm{~J}\)
Explanation:
Change in Volume \((\mathrm{V})=500-300=200 \mathrm{cc}=0.2\) litre, Pressure \((\mathrm{P})=0.6 \mathrm{~atm}\) \(\therefore\) Work done \((\mathrm{W})=\mathrm{P} \Delta \mathrm{V}=(0.2 \times 0.6)=0.12\) litre-atm or \(0.12 \times 101.3 \mathrm{~J}=12.156 \mathrm{~J}\) \({\text{q = - 10J}}\) liberated heat \()\) \(\therefore\) Acc to 1st law of thermodynamics, \(\Delta \mathrm{E}=\mathrm{q}+\mathrm{W}=-10+12.16=2.16 \mathrm{~J}\).
CHXI06:THERMODYNAMICS
369318
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
According to first law of thermodynamics, \(\mathrm{\Delta \mathrm{U}=\mathrm{q}+\mathrm{W}}\). In case of isobaric conditions, change of state is brought about at constant pressure, i.e. \(\mathrm{d p=0}\). Moreover, work done for a process is given as \(\mathrm{\mathrm{W}=-\mathrm{p}_{\text {ext. }} \Delta \mathrm{V}}\). Substituting the value of ' \(\mathrm{W}\) ' in first law of thermodynamics \(\rm{\Delta \mathrm{U}=\mathrm{q}_{\mathrm{p}}-\mathrm{p}_{\mathrm{ext} .} \cdot \Delta \mathrm{V}}\) So, option (1) is correct.
CHXI06:THERMODYNAMICS
369319
Assertion : If a refrigerator's door is kept open, room gets warmed. Reason : Material kept inside the refrigerator remains cool.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
In a refrigerator, heat removal from the interior is achieved by the appliance actively transferring heat to the outside. However, leaving the door open allows warm room air to enter inside preventing effective cooling and causing the refrigerator to act as a source of heat, raising both its internal temperature and the room temperature.So, option (2) is correct.
CHXI06:THERMODYNAMICS
369320
A system has internal energy equal to 200 J . 500 J of work is done on the system when 400 J of heat is lost. The final internal energy of the system is ____ J.
369321
Which among the following is a feature of adiabatic expansion?
1 \(\mathrm{\Delta \mathrm{V} < 0}\)
2 \(\mathrm{\Delta \mathrm{U} < 0}\)
3 \(\mathrm{\Delta U>0}\)
4 \(\mathrm{\Delta \mathrm{T}=0}\)
Explanation:
For adiabatic expansion, \(\mathrm{q=0}\) For expansion, \(\mathrm{\Delta V>0}\), hence, the work done, \(\mathrm{w < 0}\) According to \(\mathrm{1^{\text {st }}}\) law of thermodynamics, \(\mathrm{\Delta U=q+w}\) \(\mathrm{\Delta U < 0}\)
369317
The volume of a gas decreases from \(500 \mathrm{cc}\) to \(300 \mathrm{cc}\) when a sample of gas is compressed by an average pressure of \(0.6 \mathrm{~atm}\). During this process \(10 \mathrm{~J}\) of heat is liberated. The change in internal energy is
1 \(-2.16 \mathrm{~J}\)
2 \(12.156 \mathrm{~J}\)
3 \(2.16 \mathrm{~J}\)
4 \(101.3 \mathrm{~J}\)
Explanation:
Change in Volume \((\mathrm{V})=500-300=200 \mathrm{cc}=0.2\) litre, Pressure \((\mathrm{P})=0.6 \mathrm{~atm}\) \(\therefore\) Work done \((\mathrm{W})=\mathrm{P} \Delta \mathrm{V}=(0.2 \times 0.6)=0.12\) litre-atm or \(0.12 \times 101.3 \mathrm{~J}=12.156 \mathrm{~J}\) \({\text{q = - 10J}}\) liberated heat \()\) \(\therefore\) Acc to 1st law of thermodynamics, \(\Delta \mathrm{E}=\mathrm{q}+\mathrm{W}=-10+12.16=2.16 \mathrm{~J}\).
CHXI06:THERMODYNAMICS
369318
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
According to first law of thermodynamics, \(\mathrm{\Delta \mathrm{U}=\mathrm{q}+\mathrm{W}}\). In case of isobaric conditions, change of state is brought about at constant pressure, i.e. \(\mathrm{d p=0}\). Moreover, work done for a process is given as \(\mathrm{\mathrm{W}=-\mathrm{p}_{\text {ext. }} \Delta \mathrm{V}}\). Substituting the value of ' \(\mathrm{W}\) ' in first law of thermodynamics \(\rm{\Delta \mathrm{U}=\mathrm{q}_{\mathrm{p}}-\mathrm{p}_{\mathrm{ext} .} \cdot \Delta \mathrm{V}}\) So, option (1) is correct.
CHXI06:THERMODYNAMICS
369319
Assertion : If a refrigerator's door is kept open, room gets warmed. Reason : Material kept inside the refrigerator remains cool.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
In a refrigerator, heat removal from the interior is achieved by the appliance actively transferring heat to the outside. However, leaving the door open allows warm room air to enter inside preventing effective cooling and causing the refrigerator to act as a source of heat, raising both its internal temperature and the room temperature.So, option (2) is correct.
CHXI06:THERMODYNAMICS
369320
A system has internal energy equal to 200 J . 500 J of work is done on the system when 400 J of heat is lost. The final internal energy of the system is ____ J.
369321
Which among the following is a feature of adiabatic expansion?
1 \(\mathrm{\Delta \mathrm{V} < 0}\)
2 \(\mathrm{\Delta \mathrm{U} < 0}\)
3 \(\mathrm{\Delta U>0}\)
4 \(\mathrm{\Delta \mathrm{T}=0}\)
Explanation:
For adiabatic expansion, \(\mathrm{q=0}\) For expansion, \(\mathrm{\Delta V>0}\), hence, the work done, \(\mathrm{w < 0}\) According to \(\mathrm{1^{\text {st }}}\) law of thermodynamics, \(\mathrm{\Delta U=q+w}\) \(\mathrm{\Delta U < 0}\)
369317
The volume of a gas decreases from \(500 \mathrm{cc}\) to \(300 \mathrm{cc}\) when a sample of gas is compressed by an average pressure of \(0.6 \mathrm{~atm}\). During this process \(10 \mathrm{~J}\) of heat is liberated. The change in internal energy is
1 \(-2.16 \mathrm{~J}\)
2 \(12.156 \mathrm{~J}\)
3 \(2.16 \mathrm{~J}\)
4 \(101.3 \mathrm{~J}\)
Explanation:
Change in Volume \((\mathrm{V})=500-300=200 \mathrm{cc}=0.2\) litre, Pressure \((\mathrm{P})=0.6 \mathrm{~atm}\) \(\therefore\) Work done \((\mathrm{W})=\mathrm{P} \Delta \mathrm{V}=(0.2 \times 0.6)=0.12\) litre-atm or \(0.12 \times 101.3 \mathrm{~J}=12.156 \mathrm{~J}\) \({\text{q = - 10J}}\) liberated heat \()\) \(\therefore\) Acc to 1st law of thermodynamics, \(\Delta \mathrm{E}=\mathrm{q}+\mathrm{W}=-10+12.16=2.16 \mathrm{~J}\).
CHXI06:THERMODYNAMICS
369318
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
According to first law of thermodynamics, \(\mathrm{\Delta \mathrm{U}=\mathrm{q}+\mathrm{W}}\). In case of isobaric conditions, change of state is brought about at constant pressure, i.e. \(\mathrm{d p=0}\). Moreover, work done for a process is given as \(\mathrm{\mathrm{W}=-\mathrm{p}_{\text {ext. }} \Delta \mathrm{V}}\). Substituting the value of ' \(\mathrm{W}\) ' in first law of thermodynamics \(\rm{\Delta \mathrm{U}=\mathrm{q}_{\mathrm{p}}-\mathrm{p}_{\mathrm{ext} .} \cdot \Delta \mathrm{V}}\) So, option (1) is correct.
CHXI06:THERMODYNAMICS
369319
Assertion : If a refrigerator's door is kept open, room gets warmed. Reason : Material kept inside the refrigerator remains cool.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
In a refrigerator, heat removal from the interior is achieved by the appliance actively transferring heat to the outside. However, leaving the door open allows warm room air to enter inside preventing effective cooling and causing the refrigerator to act as a source of heat, raising both its internal temperature and the room temperature.So, option (2) is correct.
CHXI06:THERMODYNAMICS
369320
A system has internal energy equal to 200 J . 500 J of work is done on the system when 400 J of heat is lost. The final internal energy of the system is ____ J.
369321
Which among the following is a feature of adiabatic expansion?
1 \(\mathrm{\Delta \mathrm{V} < 0}\)
2 \(\mathrm{\Delta \mathrm{U} < 0}\)
3 \(\mathrm{\Delta U>0}\)
4 \(\mathrm{\Delta \mathrm{T}=0}\)
Explanation:
For adiabatic expansion, \(\mathrm{q=0}\) For expansion, \(\mathrm{\Delta V>0}\), hence, the work done, \(\mathrm{w < 0}\) According to \(\mathrm{1^{\text {st }}}\) law of thermodynamics, \(\mathrm{\Delta U=q+w}\) \(\mathrm{\Delta U < 0}\)
369317
The volume of a gas decreases from \(500 \mathrm{cc}\) to \(300 \mathrm{cc}\) when a sample of gas is compressed by an average pressure of \(0.6 \mathrm{~atm}\). During this process \(10 \mathrm{~J}\) of heat is liberated. The change in internal energy is
1 \(-2.16 \mathrm{~J}\)
2 \(12.156 \mathrm{~J}\)
3 \(2.16 \mathrm{~J}\)
4 \(101.3 \mathrm{~J}\)
Explanation:
Change in Volume \((\mathrm{V})=500-300=200 \mathrm{cc}=0.2\) litre, Pressure \((\mathrm{P})=0.6 \mathrm{~atm}\) \(\therefore\) Work done \((\mathrm{W})=\mathrm{P} \Delta \mathrm{V}=(0.2 \times 0.6)=0.12\) litre-atm or \(0.12 \times 101.3 \mathrm{~J}=12.156 \mathrm{~J}\) \({\text{q = - 10J}}\) liberated heat \()\) \(\therefore\) Acc to 1st law of thermodynamics, \(\Delta \mathrm{E}=\mathrm{q}+\mathrm{W}=-10+12.16=2.16 \mathrm{~J}\).
CHXI06:THERMODYNAMICS
369318
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
According to first law of thermodynamics, \(\mathrm{\Delta \mathrm{U}=\mathrm{q}+\mathrm{W}}\). In case of isobaric conditions, change of state is brought about at constant pressure, i.e. \(\mathrm{d p=0}\). Moreover, work done for a process is given as \(\mathrm{\mathrm{W}=-\mathrm{p}_{\text {ext. }} \Delta \mathrm{V}}\). Substituting the value of ' \(\mathrm{W}\) ' in first law of thermodynamics \(\rm{\Delta \mathrm{U}=\mathrm{q}_{\mathrm{p}}-\mathrm{p}_{\mathrm{ext} .} \cdot \Delta \mathrm{V}}\) So, option (1) is correct.
CHXI06:THERMODYNAMICS
369319
Assertion : If a refrigerator's door is kept open, room gets warmed. Reason : Material kept inside the refrigerator remains cool.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
In a refrigerator, heat removal from the interior is achieved by the appliance actively transferring heat to the outside. However, leaving the door open allows warm room air to enter inside preventing effective cooling and causing the refrigerator to act as a source of heat, raising both its internal temperature and the room temperature.So, option (2) is correct.
CHXI06:THERMODYNAMICS
369320
A system has internal energy equal to 200 J . 500 J of work is done on the system when 400 J of heat is lost. The final internal energy of the system is ____ J.
369321
Which among the following is a feature of adiabatic expansion?
1 \(\mathrm{\Delta \mathrm{V} < 0}\)
2 \(\mathrm{\Delta \mathrm{U} < 0}\)
3 \(\mathrm{\Delta U>0}\)
4 \(\mathrm{\Delta \mathrm{T}=0}\)
Explanation:
For adiabatic expansion, \(\mathrm{q=0}\) For expansion, \(\mathrm{\Delta V>0}\), hence, the work done, \(\mathrm{w < 0}\) According to \(\mathrm{1^{\text {st }}}\) law of thermodynamics, \(\mathrm{\Delta U=q+w}\) \(\mathrm{\Delta U < 0}\)
369317
The volume of a gas decreases from \(500 \mathrm{cc}\) to \(300 \mathrm{cc}\) when a sample of gas is compressed by an average pressure of \(0.6 \mathrm{~atm}\). During this process \(10 \mathrm{~J}\) of heat is liberated. The change in internal energy is
1 \(-2.16 \mathrm{~J}\)
2 \(12.156 \mathrm{~J}\)
3 \(2.16 \mathrm{~J}\)
4 \(101.3 \mathrm{~J}\)
Explanation:
Change in Volume \((\mathrm{V})=500-300=200 \mathrm{cc}=0.2\) litre, Pressure \((\mathrm{P})=0.6 \mathrm{~atm}\) \(\therefore\) Work done \((\mathrm{W})=\mathrm{P} \Delta \mathrm{V}=(0.2 \times 0.6)=0.12\) litre-atm or \(0.12 \times 101.3 \mathrm{~J}=12.156 \mathrm{~J}\) \({\text{q = - 10J}}\) liberated heat \()\) \(\therefore\) Acc to 1st law of thermodynamics, \(\Delta \mathrm{E}=\mathrm{q}+\mathrm{W}=-10+12.16=2.16 \mathrm{~J}\).
CHXI06:THERMODYNAMICS
369318
Which among the following equations represents the first law of thermodynamics under isobaric conditions?
According to first law of thermodynamics, \(\mathrm{\Delta \mathrm{U}=\mathrm{q}+\mathrm{W}}\). In case of isobaric conditions, change of state is brought about at constant pressure, i.e. \(\mathrm{d p=0}\). Moreover, work done for a process is given as \(\mathrm{\mathrm{W}=-\mathrm{p}_{\text {ext. }} \Delta \mathrm{V}}\). Substituting the value of ' \(\mathrm{W}\) ' in first law of thermodynamics \(\rm{\Delta \mathrm{U}=\mathrm{q}_{\mathrm{p}}-\mathrm{p}_{\mathrm{ext} .} \cdot \Delta \mathrm{V}}\) So, option (1) is correct.
CHXI06:THERMODYNAMICS
369319
Assertion : If a refrigerator's door is kept open, room gets warmed. Reason : Material kept inside the refrigerator remains cool.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
In a refrigerator, heat removal from the interior is achieved by the appliance actively transferring heat to the outside. However, leaving the door open allows warm room air to enter inside preventing effective cooling and causing the refrigerator to act as a source of heat, raising both its internal temperature and the room temperature.So, option (2) is correct.
CHXI06:THERMODYNAMICS
369320
A system has internal energy equal to 200 J . 500 J of work is done on the system when 400 J of heat is lost. The final internal energy of the system is ____ J.
369321
Which among the following is a feature of adiabatic expansion?
1 \(\mathrm{\Delta \mathrm{V} < 0}\)
2 \(\mathrm{\Delta \mathrm{U} < 0}\)
3 \(\mathrm{\Delta U>0}\)
4 \(\mathrm{\Delta \mathrm{T}=0}\)
Explanation:
For adiabatic expansion, \(\mathrm{q=0}\) For expansion, \(\mathrm{\Delta V>0}\), hence, the work done, \(\mathrm{w < 0}\) According to \(\mathrm{1^{\text {st }}}\) law of thermodynamics, \(\mathrm{\Delta U=q+w}\) \(\mathrm{\Delta U < 0}\)
