JEE Main 2026 · 6 Apr · Shift 2 · Physics Q35

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PhysicsSingle correct+4 / -1Question 35 of 75

If 2 mole of an ideal monoatomic gas at temperature $T$ , is mixed with 6 mole of another ideal monoatomic gas at temperature $2T$ then the temperature of mixture is :

\dfrac52T

\dfrac54T

\dfrac72T

\dfrac74T

Answer and worked solution

Official answer: D

Internal energy is conserved (both monoatomic, same $C_v$ ):
$2T+6(2T)=8T_f\ \Rightarrow\ T_f=\frac74T.$

(D)

Topics:Degrees of freedom and equipartition

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JEE Main 2026 · 6 Apr · Shift 2, Physics question 35