JEE Main 2021 (Online) 17th March Morning Shift | Heat and Thermodynamics Question 201 | Physics

Two ideal polyatomic gases at temperatures T₁ and T₂ are mixed so that there is no loss of energy. If F₁ and F₂, m₁ and m₂, n₁ and n₂ be the degrees of freedom, masses, number of molecules of the first and second gas respectively, the temperature of mixture of these two gases is :

$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{F_1} + {F_2}}}$$

$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1}{F_1} + {n_2}{F_2}}}$$

$${{{n_1}{T_1} + {n_2}{T_2}} \over {{n_1} + {n_2}}}$$

$${{{n_1}{F_1}{T_1} + {n_2}{F_2}{T_2}} \over {{n_1} + {n_2}}}$$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

Two identical metal wires of thermal conductivities K₁ and K₂ respectively are connected in series. The effective thermal conductivity of the combination is :

$${{2{K_1}{K_2}} \over {{K_1} + {K_2}}}$$

$${{{K_1} + {K_2}} \over {{K_1}{K_2}}}$$

$${{{K_1} + {K_2}} \over {2{K_1}{K_2}}}$$

$${{{K_1}{K_2}} \over {{K_1} + {K_2}}}$$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A Carnot's engine working between 400 K and 800 K has a work output of 1200 J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is :

2400 J

1600 J

1800 J

3200 J

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