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JEE Advanced 2019Paper 2
Exam
JEE Advanced
Year
2019
Paper
Paper 2
Subject
Physics
Chapter
Thermodynamics

JEE Advanced 2019 · Paper 2 · Physics · Thermodynamics

Answer the following by appropriately matching the lists based on...

Answer the following by appropriately matching the lists based on the information given in the paragraph.
In a thermodynamics process on an ideal monatomic gas, the infinitesimal heat absorbed by the gas is given by T\DeltaX,T\DeltaX, where TT is temperature of the system and \DeltaX\DeltaX is the infinitesimal change in a thermodynamic quantity XX of the system. For a mole of monatomic ideal gas X=32Rln(TTA)+Rln(VVA).X = \dfrac{3}{2}Rln\left(\dfrac{T}{{T}_{A}}\right) + Rln\left(\dfrac{V}{{V}_{A}}\right) . Here, RR is gas constant, VV is volume of gas, TA{T}_{A} and VA{V}_{A} are constants.
The List-I below gives some quantities involved in a process and List-II gives some possible values of these quantities.
 

 List I List II
(a)( a )Work done by the system in process 1→2→31 \to 2 \to 3(p)( p )13RT0ln⁡2\dfrac{1}{3}R{T}_{0}\ln 2
(b)( b )Change in internal energy in process 1→2→31 \to 2 \to 3(q)( q )13RT0\dfrac{1}{3}R{T}_{0}
(c)( c )Heat absorbed by the system in process 1→2→31 \to 2 \to 3(r)( r )RT0R{T}_{0}
(d)( d )Heat absorbed by the system in process 1→21 \to 2(s)( s )43RT0\dfrac{4}{3}R{T}_{0}
  (t)( t )13RT0(3+ln⁡2)\dfrac{1}{3}R{T}_{0}\left(3 + \ln 2\right)
  (u)( u )56RT0\dfrac{5}{6}R{T}_{0}

If the process carried out on one mole of monatomic ideal gas is as shown in figure in the TT - VV -diagram with P0V0=13RT0,{P}_{0}{V}_{0} = \dfrac{1}{3}R{T}_{0}, the correct match is,
Answer the following by appropriately matching the lists based on the information given in the paragraph. In a

Options

  1. Aa−q,b−r,c−p,d−ua - q, b - r, c - p, d - u
  2. Ba−s,b−r,c−q,d−ta - s, b - r, c - q, d - t
  3. Ca−q,b−r,c−s,d−ua - q, b - r, c - s, d - u
  4. Da−p,b−r,c−t,d−pa - p, b - r, c - t, d - p

Correct answer

D. a−p,b−r,c−t,d−pa - p, b - r, c - t, d - p

Step-by-step solution

1−-2processisisothermalandprocess is isothermal and2−-3processisisochoric.<br/>(a)W1→2=nRTlnVfFi=1×RT03lnV2V1=RT03ln2V0V0=RT03ln⁡2process is isochoric. <br/>\left(a\right){W}_{1 \to 2} = nRTln\dfrac{{V}_{f}}{{F}_{i}} = 1 \times R\dfrac{{T}_{0}}{3}ln \dfrac{{V}_{2}}{{V}_{1}} = \dfrac{R{T}_{0}}{3}ln \dfrac{2{V}_{0}}{{V}_{0}} = \dfrac{R{T}_{0}}{3}\ln 2
W2→3=0{W}_{2 \to 3} = 0 (isochoric process)
W1→2→3=W1→2+W2→3=RT03ln⁡2(a→P){W}_{1 \to 2 \to 3} = {W}_{1 \to 2} + {W}_{2 \to 3} = \dfrac{R{T}_{0}}{3}\ln 2\left(a \to P\right)
\left(b\right) ∆ U = \dfrac{f}{2}nR(Tf−Ti)R\left({T}_{f} - {T}_{i}\right)
∆U1→2→3=32[1×R(T0−T03)]∆ {U}_{1 \to 2 \to 3} = \dfrac{3}{2}\left[1 \times R\left({T}_{0} - \dfrac{{T}_{0}}{3}\right)\right]
{=RT0(b→R)\begin{cases}= R{T}_{0} & \left(b \to R\right)\end{cases}
\left(c\right){Q}_{1 \to 2 \to 3} = ∆ {U}_{1 \to 2 \to 3} + {W}_{1 \to 2 \to 3}(Firstlawofthermodynamics)<br/>(First law of thermodynamics) <br/>= R{T}_{0} + \dfrac{R{T}_{0}}{3}\ln 2<br/><br/>\begin{cases}= \dfrac{R{T}_{0}}{3}\left[3 + \ln 2\right] & \left(c \to t\right)\end{cases}<br/>(d)Q1→2=∆U1→2+W1→2<br/>\left(d\right){Q}_{1 \to 2} = ∆ {U}_{1 \to 2} + {W}_{1 \to 2}
{=0+RT03ln⁡2=RT03ln⁡2(d→p)\begin{cases}= 0 + \dfrac{R{T}_{0}}{3}\ln 2 = \dfrac{R{T}_{0}}{3}\ln 2 & \left(d \to p\right)\end{cases}
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