09. Heat Engine, Carnot’s Cycle and Refrigeration (COP)
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NEET DIGITAL LIBRARY
Thermodynamics

148517 Other is labelled as Reason $R$
Assertion A: Efficiency of reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir,
Reason R: The efficiency of Carnot's engine depends not only on temperature of cold reservoir but if depends on the temperature of hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

1 A is true but R is false
2 Both $\mathrm{A}$ and $\mathrm{R}$ are true $\mathrm{R}$ is correct explanation
3 Both A and R are true but R NOT the correct explanation of $A$
4 A is false but $\mathrm{R}$ is true
JEE Main-30.01.2023
Thermodynamics

148523 If the temperatures of source and sink of a Carnot engine having efficiency $\eta$ are each decreased by $100 \mathrm{~K}$, then the efficiency

1 remains constant
2 becomes 1
3 decreases
4 increases
5 becomes zero
Kerala CEE- 2013
Thermodynamics

148556 An ideal heat engine working between temperature $T_{1}$ and $T_{2}$ has an efficiency $\eta$, the new efficiency if temperature of both the source and sink are doubled, will be

1 $\eta / 2$
2 $\eta$
3 $2 \eta$
4 $3 \eta$
JIPMER- 2007
Thermodynamics

148574 What is the coefficient of performance of a refrigerator that has a hot reservoir temperature of $27^{\circ} \mathrm{C}$ and a cold reservoir temperature of $-23^{\circ} \mathrm{C}$ ?

1 4
2 5
3 6
4 7
AIIMS-26.05.2019(E) Shift-2
Join With Us for More Updates
Thermodynamics

148517 Other is labelled as Reason $R$
Assertion A: Efficiency of reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir,
Reason R: The efficiency of Carnot's engine depends not only on temperature of cold reservoir but if depends on the temperature of hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

1 A is true but R is false
2 Both $\mathrm{A}$ and $\mathrm{R}$ are true $\mathrm{R}$ is correct explanation
3 Both A and R are true but R NOT the correct explanation of $A$
4 A is false but $\mathrm{R}$ is true
JEE Main-30.01.2023
Thermodynamics

148523 If the temperatures of source and sink of a Carnot engine having efficiency $\eta$ are each decreased by $100 \mathrm{~K}$, then the efficiency

1 remains constant
2 becomes 1
3 decreases
4 increases
5 becomes zero
Kerala CEE- 2013
Thermodynamics

148556 An ideal heat engine working between temperature $T_{1}$ and $T_{2}$ has an efficiency $\eta$, the new efficiency if temperature of both the source and sink are doubled, will be

1 $\eta / 2$
2 $\eta$
3 $2 \eta$
4 $3 \eta$
JIPMER- 2007
Thermodynamics

148574 What is the coefficient of performance of a refrigerator that has a hot reservoir temperature of $27^{\circ} \mathrm{C}$ and a cold reservoir temperature of $-23^{\circ} \mathrm{C}$ ?

1 4
2 5
3 6
4 7
AIIMS-26.05.2019(E) Shift-2
For More Updates join with Us
Thermodynamics

148517 Other is labelled as Reason $R$
Assertion A: Efficiency of reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir,
Reason R: The efficiency of Carnot's engine depends not only on temperature of cold reservoir but if depends on the temperature of hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

1 A is true but R is false
2 Both $\mathrm{A}$ and $\mathrm{R}$ are true $\mathrm{R}$ is correct explanation
3 Both A and R are true but R NOT the correct explanation of $A$
4 A is false but $\mathrm{R}$ is true
JEE Main-30.01.2023
Thermodynamics

148523 If the temperatures of source and sink of a Carnot engine having efficiency $\eta$ are each decreased by $100 \mathrm{~K}$, then the efficiency

1 remains constant
2 becomes 1
3 decreases
4 increases
5 becomes zero
Kerala CEE- 2013
Thermodynamics

148556 An ideal heat engine working between temperature $T_{1}$ and $T_{2}$ has an efficiency $\eta$, the new efficiency if temperature of both the source and sink are doubled, will be

1 $\eta / 2$
2 $\eta$
3 $2 \eta$
4 $3 \eta$
JIPMER- 2007
Thermodynamics

148574 What is the coefficient of performance of a refrigerator that has a hot reservoir temperature of $27^{\circ} \mathrm{C}$ and a cold reservoir temperature of $-23^{\circ} \mathrm{C}$ ?

1 4
2 5
3 6
4 7
AIIMS-26.05.2019(E) Shift-2
NEET DIGITAL LIBRARY
Thermodynamics

148517 Other is labelled as Reason $R$
Assertion A: Efficiency of reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir,
Reason R: The efficiency of Carnot's engine depends not only on temperature of cold reservoir but if depends on the temperature of hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

1 A is true but R is false
2 Both $\mathrm{A}$ and $\mathrm{R}$ are true $\mathrm{R}$ is correct explanation
3 Both A and R are true but R NOT the correct explanation of $A$
4 A is false but $\mathrm{R}$ is true
JEE Main-30.01.2023
Thermodynamics

148523 If the temperatures of source and sink of a Carnot engine having efficiency $\eta$ are each decreased by $100 \mathrm{~K}$, then the efficiency

1 remains constant
2 becomes 1
3 decreases
4 increases
5 becomes zero
Kerala CEE- 2013
Thermodynamics

148556 An ideal heat engine working between temperature $T_{1}$ and $T_{2}$ has an efficiency $\eta$, the new efficiency if temperature of both the source and sink are doubled, will be

1 $\eta / 2$
2 $\eta$
3 $2 \eta$
4 $3 \eta$
JIPMER- 2007
Thermodynamics

148574 What is the coefficient of performance of a refrigerator that has a hot reservoir temperature of $27^{\circ} \mathrm{C}$ and a cold reservoir temperature of $-23^{\circ} \mathrm{C}$ ?

1 4
2 5
3 6
4 7
AIIMS-26.05.2019(E) Shift-2
Join With Us for More Updates