IAT (IISER) 2023 | Heat and Thermodynamics Question 3 | Physics

57. Consider a Carnot heat engine operating between a heat reservoir at temperature 600 K , and an external atmosphere at temperature 300 K . In one cycle, 1000 kJ of heat is extracted from the heat reservoir, and the associated work is input to a reversible refrigerator that operates between 200 K and the same external atmosphere at 300 K . The refrigerator completes one cycle and releases heat into the atmosphere. How much heat is released into the atmosphere at the end of one cycle of the combined system?

2500 Kj

2000 kJ

1000 kJ

500 kJ

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

Two identical containers kept at the same temperature carry the same gas with different molecular mean free paths $l_1$ and $l_2$. The gas from the first container is completely transferred into the second at the same temperature. What is the molecular mean free path of the resultant mixture in the second container?

$\frac{l_1 l_2}{l_1+l_2}$

$\sqrt{l_1 l_2}$

$l_1+l_2$

$\sqrt{l_1^2+l_2^2}$

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

An ideal rigid diatomic gas undergoes expansion at constant pressure when $\Delta Q$ heat is added to it. What is the ratio of the change in the internal energy $\Delta U$ to the heat supplied $\Delta Q$ ?

$\frac{\Delta U}{\Delta Q}=\frac{3}{5}$

$\frac{\Delta U}{\Delta Q}=\frac{5}{7}$

$\frac{\Delta U}{\Delta Q}=\frac{7}{9}$

$\frac{\Delta U}{\Delta Q}=\frac{2}{3}$

IAT (IISER) Subjects