AP EAPCET 2025 - 23rd May Evening Shift | Heat and Thermodynamics Question 23 | Physics

If a heat engine and a refrigerator are working between the same two temperatures $T_1$ and $T_2\left(T_1>T_2\right)$, then the ratio of efficiency of heat engine to coefficient of performance of refrigerator is

$\frac{\left(T_1-T_2\right)}{T_1 T_2}$

$\frac{\left(T_1+T_2\right)}{T_1 T_2}$

$\frac{\left(T_1-T_2\right)^2}{T_1 T_2}$

$\frac{\left(T_1+T_2\right)^2}{T_1 T_2}$

AP EAPCET 2025 - 23rd May Evening Shift

MCQ (Single Correct Answer)

-0

If the internal energy of 3 moles of a gas at a temperature of $27^{\circ} \mathrm{C}$ is 2250 R , then the number of degrees of freedom of the gas is

( $R=$ Universal gas constant)

AP EAPCET 2025 - 23rd May Morning Shift

MCQ (Single Correct Answer)

-0

Steam at $100^{\circ} \mathrm{C}$ is passed into 114 g of water at $30^o$ The mass of water present in the mixture when the temperature of the water becomes $70^{\circ} \mathrm{C}$ is (Latent heat of steam $=540 \mathrm{cal} \mathrm{g}^{-1}$, Specific heat capacity of water $=1 \mathrm{cal} \mathrm{g}^{-1}{ }^{\circ} \mathrm{C}^{-1}$ )

122 g

132 g

142 g

152 g

AP EAPCET 2025 - 23rd May Morning Shift

MCQ (Single Correct Answer)

-0

In a Carnot engine if the work done during isothermal expansion is $25 \%$ more than the work done during isothermal compression, then the efficiency of the engine is

$10 \%$

$15 \%$

$20 \%$

$25 \%$

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