AP EAPCET 2024 - 22th May Evening Shift | Heat and Thermodynamics Question 4 | Physics

The efficiency of a Carnot heat engine is $25 \%$ and the temperature of its source is $127^{\circ} \mathrm{C}$. Without changing the temperature of the source, if absolute temperature of the sink is decreased by $10 \%$, the efficiency of the engine is

$27.5 \%$

$17.5 \%$

$32.5 \%$

$22.5 \%$

AP EAPCET 2024 - 22th May Evening Shift

MCQ (Single Correct Answer)

-0

The total internal energy of 2 moles of a monoatomic gas at a temperature $27^{\circ} \mathrm{C}$ is $U$. The total internal energy of 3 moles of a diatomic gas at a temperature $127^{\circ} \mathrm{C}$ is

$U$

$\frac{10 U}{3}$

2 U

$\frac{2 U}{3}$

AP EAPCET 2024 - 22th May Morning Shift

MCQ (Single Correct Answer)

-0

A metal ball of mass 100 g at $20^{\circ} \mathrm{C}$ is dropped in 200 g of water at $80^{\circ} \mathrm{C}$. If the resultant temperature is $70^{\circ} \mathrm{C}$, then the ratio of specific heat of the metal to that of water is

$\frac{5}{2}$

$\frac{1}{2}$

$\frac{2}{5}$

$\frac{2}{1}$

AP EAPCET 2024 - 22th May Morning Shift

MCQ (Single Correct Answer)

-0

The efficiency of a heat engine that works between the temperatures where Celsius-Fahrenheit scales coincides and Kelvin-Fahrenheit scales coincides is (approximately)

$45 \%$

$35 \%$

$60 \%$

$50 \%$

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