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Solution


Q.

A gas is compressed adiabatically, which one of the following statement is NOT true                      [2023]
1 There is no heat supplied to the system  
2 The temperature of the gas increases  
3 The change in the internal energy is equal to the work done on the gas  
4 There is no change in the internal energy  

Ans.

(4)

(1) ΔQ=0

(2) ΔQ=ΔU+ΔW⇒ΔU=-ΔW

Adiabatic compression (V↓)

ΔW=-ve ⇒ ΔU=+ve

ΔU↑⇒T↑

ΔU≠0