First Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369322 According to the first law of the thermodynamics, \(\mathrm{\Delta U=q+w}\). In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

1 At constant temperature, \(\mathrm{q=-w}\)
2 When no work is done, \(\mathrm{\Delta U=q}\)
3 In gaseous system, \(\mathrm{\Delta U=q+P \Delta V}\)
4 When work is done by the system : \(\mathrm{\Delta U=q+w}\)
CHXI06:THERMODYNAMICS

369323 Based on first law of thermodynamics which of the following is correct ?

1 for an isobaric process, \(\mathrm{\mathrm{q}_{\mathrm{p}}=\Delta \mathrm{U}+\mathrm{w}}\)
2 for an adiabatic process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{W}}\)
3 for an isochoric process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{q}_{\mathrm{v}}}\)
4 for an isothermal process, \(\mathrm{\mathrm{q}=+\mathrm{w}}\)
KCET - 2010
CHXI06:THERMODYNAMICS

369324 Assertion :
At constant temperature and pressure, whatever heat is absorbed by the system is used in doing work.
Reason :
Internal energy change is zero.

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.
CHXI06:THERMODYNAMICS

369325 Which of the following is the correct option for the expansion of an ideal gas under adiabatic condition?

1 \(\mathrm{q=0, \Delta T < 0, w \neq 0}\)
2 \(\mathrm{q=0, \Delta T \neq 0, w=0}\)
3 \(\mathrm{q \neq 0, \Delta T=0, w=0}\)
4 \(\mathrm{q=0, \Delta T=0, w=0}\)
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CHXI06:THERMODYNAMICS

369322 According to the first law of the thermodynamics, \(\mathrm{\Delta U=q+w}\). In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

1 At constant temperature, \(\mathrm{q=-w}\)
2 When no work is done, \(\mathrm{\Delta U=q}\)
3 In gaseous system, \(\mathrm{\Delta U=q+P \Delta V}\)
4 When work is done by the system : \(\mathrm{\Delta U=q+w}\)
CHXI06:THERMODYNAMICS

369323 Based on first law of thermodynamics which of the following is correct ?

1 for an isobaric process, \(\mathrm{\mathrm{q}_{\mathrm{p}}=\Delta \mathrm{U}+\mathrm{w}}\)
2 for an adiabatic process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{W}}\)
3 for an isochoric process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{q}_{\mathrm{v}}}\)
4 for an isothermal process, \(\mathrm{\mathrm{q}=+\mathrm{w}}\)
KCET - 2010
CHXI06:THERMODYNAMICS

369324 Assertion :
At constant temperature and pressure, whatever heat is absorbed by the system is used in doing work.
Reason :
Internal energy change is zero.

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.
CHXI06:THERMODYNAMICS

369325 Which of the following is the correct option for the expansion of an ideal gas under adiabatic condition?

1 \(\mathrm{q=0, \Delta T < 0, w \neq 0}\)
2 \(\mathrm{q=0, \Delta T \neq 0, w=0}\)
3 \(\mathrm{q \neq 0, \Delta T=0, w=0}\)
4 \(\mathrm{q=0, \Delta T=0, w=0}\)
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CHXI06:THERMODYNAMICS

369322 According to the first law of the thermodynamics, \(\mathrm{\Delta U=q+w}\). In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

1 At constant temperature, \(\mathrm{q=-w}\)
2 When no work is done, \(\mathrm{\Delta U=q}\)
3 In gaseous system, \(\mathrm{\Delta U=q+P \Delta V}\)
4 When work is done by the system : \(\mathrm{\Delta U=q+w}\)
CHXI06:THERMODYNAMICS

369323 Based on first law of thermodynamics which of the following is correct ?

1 for an isobaric process, \(\mathrm{\mathrm{q}_{\mathrm{p}}=\Delta \mathrm{U}+\mathrm{w}}\)
2 for an adiabatic process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{W}}\)
3 for an isochoric process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{q}_{\mathrm{v}}}\)
4 for an isothermal process, \(\mathrm{\mathrm{q}=+\mathrm{w}}\)
KCET - 2010
CHXI06:THERMODYNAMICS

369324 Assertion :
At constant temperature and pressure, whatever heat is absorbed by the system is used in doing work.
Reason :
Internal energy change is zero.

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.
CHXI06:THERMODYNAMICS

369325 Which of the following is the correct option for the expansion of an ideal gas under adiabatic condition?

1 \(\mathrm{q=0, \Delta T < 0, w \neq 0}\)
2 \(\mathrm{q=0, \Delta T \neq 0, w=0}\)
3 \(\mathrm{q \neq 0, \Delta T=0, w=0}\)
4 \(\mathrm{q=0, \Delta T=0, w=0}\)
For More Updates join with Us
CHXI06:THERMODYNAMICS

369322 According to the first law of the thermodynamics, \(\mathrm{\Delta U=q+w}\). In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?

1 At constant temperature, \(\mathrm{q=-w}\)
2 When no work is done, \(\mathrm{\Delta U=q}\)
3 In gaseous system, \(\mathrm{\Delta U=q+P \Delta V}\)
4 When work is done by the system : \(\mathrm{\Delta U=q+w}\)
CHXI06:THERMODYNAMICS

369323 Based on first law of thermodynamics which of the following is correct ?

1 for an isobaric process, \(\mathrm{\mathrm{q}_{\mathrm{p}}=\Delta \mathrm{U}+\mathrm{w}}\)
2 for an adiabatic process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{W}}\)
3 for an isochoric process, \(\mathrm{\Delta \mathrm{U}=-\mathrm{q}_{\mathrm{v}}}\)
4 for an isothermal process, \(\mathrm{\mathrm{q}=+\mathrm{w}}\)
KCET - 2010
CHXI06:THERMODYNAMICS

369324 Assertion :
At constant temperature and pressure, whatever heat is absorbed by the system is used in doing work.
Reason :
Internal energy change is zero.

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.
CHXI06:THERMODYNAMICS

369325 Which of the following is the correct option for the expansion of an ideal gas under adiabatic condition?

1 \(\mathrm{q=0, \Delta T < 0, w \neq 0}\)
2 \(\mathrm{q=0, \Delta T \neq 0, w=0}\)
3 \(\mathrm{q \neq 0, \Delta T=0, w=0}\)
4 \(\mathrm{q=0, \Delta T=0, w=0}\)