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11. thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
An ideal gas is made to undergo a cycle depicted by the $p-V$ diagram given below. The curved line from $A$ to $B$ is an adiabat.Then,
  • ✓
    the efficiency of this cycle is given by unity as on heat is released during the cycle
  • B
    heat is absorbed in the upper part of the straight line path and released in the lower part
  • C
    if $T_1$ and $T_2$ are the maximum and minimum temperatures reached during the cycle, then the efficiency is given by $1-\frac{T_2}{T_1}$
  • D
    the cycle can only be carried out in the reverse of the direction shown in above figure
✓

Answer

Correct option: A.
the efficiency of this cycle is given by unity as on heat is released during the cycle
a
(a)

$A$ to $B$ is an expansion process and $B$ to $A$ is adiabatic compression.

So, heat is absorbed in process $A$ to $B$ and is released in process $B$ to $A$.

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