DEPARTMENT OF PHYSICS “T3 Examination, May-2018” Semester: II Subject: Elasticity, Waves Heat and Thermodynamics Branch: B.Sc.B.Ed Course Type: Hard Time: 3 Hours Max. Marks: 60
Date of Exam: 23/05/2018 Subject Code: PHH122-T Session:I Course Nature: Program: B.Sc. B.Ed Signatures: HOD/Associate HOD:
Part A 1. Define the following in details/formulations: (a) Thermal Equilibrium (b) Entropy (c) Limitation of First Law of Thermodynamics (d) Adiabatic Process (e) Isothermal Process (f) Isochoric Process (g) Kelvin and Clausius statements for Second Law of Thermodynamics (h) Isoenthalpic Effect (i) Reversible Processes (j) Carnot Theorem
(10×2=20)
Part B 2. (a) Derive the relation for developing the temperature scale of different materials (say water). (b) The resistance of a Pt wire at θ°C on the ideal gas scale is given by R θ=R0(1+αθ+βθ2), where R0 denotes resistance at 0°C, α=3.5=3.5×10-3 °C-1 and β= -3.0×10-6 °C-2. Calculate the temperature on the resistance scale when the temperature is 50°C. [10] 3. State and prove Zeroth law of Thermodynamics and using this law derive the equation of state. [10] 4. Derive the Maxwell Thermodynamic relation for Internal energy, Helmholtz Free Energy, Enthalpy and Gibb’s Free Energy. [10] Part C 5. State and explain the working of Carnot Engine with neat diagram and hence calculate its efficiency. [10] 6. (a) A Carnot engine has an efficiency of 40%. If its efficiency is to be raised by 60%, by how much the temperature of the source is increased if the sink is at 27°C. [5] *******