JEE Main 2021 (Online) 18th March Evening Shift | Heat and Thermodynamics Question 194 | Physics

Consider a sample of oxygen behaving like an ideal gas. At 300 K, the ratio of root mean square (rms) velocity to the average velocity of gas molecule would be :

(Molecular weight of oxygen is 32g/mol; R = 8.3 J K^$$-$$1 mol^$$-$$1)

$$\sqrt {{{3\pi } \over 8}} $$

$$\sqrt {{3 \over 3}} $$

$$\sqrt {{8 \over 3}} $$

$$\sqrt {{{8\pi } \over 3}} $$

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-1

For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to (where $$\gamma$$ is the ratio of specific heats) :

$$ - {1 \over \gamma }{{dV} \over V}$$

$$ - \gamma {V \over {dV}}$$

$$ - \gamma {{dV} \over V}$$

$${{dV} \over V}$$

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-1

An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S₁ and that of the other part is S₂. Given that S₁ > S₂. If the piston is removed then the total entropy of the system will be :

S₁ $$-$$ S₂

$${{{S_1}} \over {{S_2}}}$$

S₁ $$\times$$ S₂

S₁ + S₂

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

The P-V diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process CD is (use $$\gamma$$ = 1.4) :

JEE Main 2021 (Online) 18th March Morning Shift Physics - Heat and Thermodynamics Question 197 English