Jaypee Institute of Information Technology %28JIIT%29 2008 B.E Test 1 %3A Statistical Thermodynamics - Question Paper
JAVPKR r.MVERSl n OF INFORMATION TECHNOLOGY .WAKNAGHAT IKS I I FKBRlARV 2008 B.TEC'H IV SEMESTER (BI)
Course Code: 07&41PIIKK. Max. Marks: 20
Course Name: Statistical Thrrmoihnamict
Course C redits: 4 Max. Time: I hr.
Ql. Please give the correct answer from the given options:
(a) Out or the following, the physical quantity that relates with first law nf thermodynamics is:
(i) temperature (ii) pressure (iii) energy (iv) do. of moles
(b) Zeroth law of thermodynamics is:
(i) kinetic energy nf mokculcs of a gas is zero
(ii) ideal gas dne* not contain molecules
(iii) if two system? are separate!) in thermal equilibrium with a third system then they themselves arc in thermal equilibrium
(iv) absolute zero temperature can not be attained
(c) A piece of ice is added to a cup containing water, its entropy () increases (ii) decreases (iii) remains unchanged
(d) For the efficiency of a Carnot's cycle to be maximum
(i) temperature of the source should be infinity
(ii) temperature of the sink should be infinity
(iii) temperature of the source should be zero (V x 4)
Q2. State and explain Zeroth law of thermodynamics. On the basis of this law introduce the concept of temperature and derive the equation of male uf ihc fluid. (4)
QJ. A heat engine working between two temperatures conld convert one-
eighth of the heal supplied into work. If the lower temperature is rcduccd by 95nC, the efficiency is doubled. Find the lower temperature. (4)
Q4. Consider 1 g of perfect gas occupying volume \ at pressure P and temperature I. Derive the relations for the change in entropy of the gas in terms of P,V and T.P. (6)
Q5. Calculate the change in entropy on converting a mole nf a gas occupying 20 litres at a pressure of 2x10* N/m1 to occupying 50 litres at pressure of 5xlOJ N/m*. R=8.4 Jmolk and C,=21 Jmolk. (41
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