Second Law of Thermodynamics and Carnot Engine
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PHXI12:THERMODYNAMICS

371384 The second law of thermodynamics implies

1 Whole of heat can be converted into mechanical energy
2 No heat engine can be \(100\,\% \) efficient
3 Every heat engine has an efficiency of \(100\,\% \)
4 A refrigerator can reduce the temperature to absolute zero
PHXI12:THERMODYNAMICS

371385 A car / not's engine works as a refrigerator between \(250\;K\) and \(300\;K\). It receives \(500\,cal\) heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is

1 \(772\;J\)
2 \(420\;J\)
3 \(2100\;J\)
4 \(2520\;J\)
JEE - 2018
PHXI12:THERMODYNAMICS

371386 A heat engine operating in carnot cycle works between a source and a sink maintained at constant temperatures \(T_{1}\) and \(T_{2}\). For the efficiency to be greatest

1 \(T_{1}\) and \(T_{2}\) should be high
2 \(T_{1}\) and \(T_{2}\) should be low
3 \(T_{1}\) should be high and \(T_{2}\) should be low
4 \(T_{1}\) should be low and \(T_{2}\) should be high
PHXI12:THERMODYNAMICS

371387 A Carnot engine operating between temperatures \(T_{1}\) and \(T_{2}\) has efficiency 0.2 When \(T_{2}\) is reduced by \(50 K\), its efficiency increases to 0.4 . Then \(T_{1}\) and \(T_{2}\) are respectively

1 \(200 K, 150 K\)
2 \(250 K, 200 K\)
3 \(300 K, 250 K\)
4 \(300 K, 200 K\)
MHTCET - 2021
For More Updates join with Us
PHXI12:THERMODYNAMICS

371384 The second law of thermodynamics implies

1 Whole of heat can be converted into mechanical energy
2 No heat engine can be \(100\,\% \) efficient
3 Every heat engine has an efficiency of \(100\,\% \)
4 A refrigerator can reduce the temperature to absolute zero
PHXI12:THERMODYNAMICS

371385 A car / not's engine works as a refrigerator between \(250\;K\) and \(300\;K\). It receives \(500\,cal\) heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is

1 \(772\;J\)
2 \(420\;J\)
3 \(2100\;J\)
4 \(2520\;J\)
JEE - 2018
PHXI12:THERMODYNAMICS

371386 A heat engine operating in carnot cycle works between a source and a sink maintained at constant temperatures \(T_{1}\) and \(T_{2}\). For the efficiency to be greatest

1 \(T_{1}\) and \(T_{2}\) should be high
2 \(T_{1}\) and \(T_{2}\) should be low
3 \(T_{1}\) should be high and \(T_{2}\) should be low
4 \(T_{1}\) should be low and \(T_{2}\) should be high
PHXI12:THERMODYNAMICS

371387 A Carnot engine operating between temperatures \(T_{1}\) and \(T_{2}\) has efficiency 0.2 When \(T_{2}\) is reduced by \(50 K\), its efficiency increases to 0.4 . Then \(T_{1}\) and \(T_{2}\) are respectively

1 \(200 K, 150 K\)
2 \(250 K, 200 K\)
3 \(300 K, 250 K\)
4 \(300 K, 200 K\)
MHTCET - 2021
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PHXI12:THERMODYNAMICS

371384 The second law of thermodynamics implies

1 Whole of heat can be converted into mechanical energy
2 No heat engine can be \(100\,\% \) efficient
3 Every heat engine has an efficiency of \(100\,\% \)
4 A refrigerator can reduce the temperature to absolute zero
PHXI12:THERMODYNAMICS

371385 A car / not's engine works as a refrigerator between \(250\;K\) and \(300\;K\). It receives \(500\,cal\) heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is

1 \(772\;J\)
2 \(420\;J\)
3 \(2100\;J\)
4 \(2520\;J\)
JEE - 2018
PHXI12:THERMODYNAMICS

371386 A heat engine operating in carnot cycle works between a source and a sink maintained at constant temperatures \(T_{1}\) and \(T_{2}\). For the efficiency to be greatest

1 \(T_{1}\) and \(T_{2}\) should be high
2 \(T_{1}\) and \(T_{2}\) should be low
3 \(T_{1}\) should be high and \(T_{2}\) should be low
4 \(T_{1}\) should be low and \(T_{2}\) should be high
PHXI12:THERMODYNAMICS

371387 A Carnot engine operating between temperatures \(T_{1}\) and \(T_{2}\) has efficiency 0.2 When \(T_{2}\) is reduced by \(50 K\), its efficiency increases to 0.4 . Then \(T_{1}\) and \(T_{2}\) are respectively

1 \(200 K, 150 K\)
2 \(250 K, 200 K\)
3 \(300 K, 250 K\)
4 \(300 K, 200 K\)
MHTCET - 2021
Join With Us for More Updates
PHXI12:THERMODYNAMICS

371384 The second law of thermodynamics implies

1 Whole of heat can be converted into mechanical energy
2 No heat engine can be \(100\,\% \) efficient
3 Every heat engine has an efficiency of \(100\,\% \)
4 A refrigerator can reduce the temperature to absolute zero
PHXI12:THERMODYNAMICS

371385 A car / not's engine works as a refrigerator between \(250\;K\) and \(300\;K\). It receives \(500\,cal\) heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is

1 \(772\;J\)
2 \(420\;J\)
3 \(2100\;J\)
4 \(2520\;J\)
JEE - 2018
PHXI12:THERMODYNAMICS

371386 A heat engine operating in carnot cycle works between a source and a sink maintained at constant temperatures \(T_{1}\) and \(T_{2}\). For the efficiency to be greatest

1 \(T_{1}\) and \(T_{2}\) should be high
2 \(T_{1}\) and \(T_{2}\) should be low
3 \(T_{1}\) should be high and \(T_{2}\) should be low
4 \(T_{1}\) should be low and \(T_{2}\) should be high
PHXI12:THERMODYNAMICS

371387 A Carnot engine operating between temperatures \(T_{1}\) and \(T_{2}\) has efficiency 0.2 When \(T_{2}\) is reduced by \(50 K\), its efficiency increases to 0.4 . Then \(T_{1}\) and \(T_{2}\) are respectively

1 \(200 K, 150 K\)
2 \(250 K, 200 K\)
3 \(300 K, 250 K\)
4 \(300 K, 200 K\)
MHTCET - 2021
For More Updates join with Us