LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

AC 01

FIRST SEMESTER – NOV 2006

PH 1500 – PROP.OF MAT.& THERMAL PHYSICS

(Also equivalent to PHY 500)

 

 

Date & Time : 01-11-2006/1.00-4.00          Dept. No.                                                       Max. : 100 Marks

 

 

PART-A

Answer ALL the questions                                                    (10×2=20 marks)

 

1. Two spheres of masses 10 kg and 20 kg are 500 cm apart. Calculate the force of attraction between the masses.
2. What is geometrical moment of inertia in bending of beams?
3. Give the SI unit and dimensions of coefficient of viscosity.
4. What is critical velocity of a liquid?
5. Water wets glass surface, while mercury does not. Why?
6. Calculate the mean free path of a gas molecule of diameter 3.2 Å. The number of molecules per unit volume is 21.5x 10²³ m^-3.
7. What is an intensive variable? Give two examples.
8. Give the Classius statement of the second law of thermodynamics.
9. State the law of equipartition of energy.
10. What is perpetual motion machine of the second kind?

 

PART-B

Answer any FOUR questions                                                 (4×7.5=30 marks )

 

1. Derive an expression for the variation of acceleration due to gravity with latitude.
2. a) Derive an expression for the bending moment of a bar.                             (4)

3. b) Find the energy stored in a wire 5 metre long and 10^-3 metre in diameter when it is stretched through 3×10^-3 metre by a load. Young’s modulus of the   material is 2×10¹¹  N/m² .                                                                         (3.5)
4. a) Obtain Mayer’s formula for the flow of a gas through a capillary tube. (5.5)
5. b) State any two properties of a good lubricant. (2)
6. a) Derive Classius- Clapeyron equation for liquid-vapour equilibrium. (5)
7. b) One kilogram of water at 373K is mixed with 1 kilogram of water at 273K. Estimate the change in entropy. (2.5)
8. Derive Maxwell’s thermodynamical relations.

 

 

PART-C

Answer any FOUR questions                                                 (4×12.5=50 marks)

16. a) Derive the relationship between the three elastic moduli and deduce an expression for Poisson’s ratio.                                                                        (7.5)
17. b) Calculate the Poisson’s ratio for the material whose

Young’s modulus = 12.25X10¹⁰ N/m² and

Rigidity modulus = 4.55 X 10¹⁰ N/m².                                                      (5)

17. a) Describe with relevant theory the Quincke’s method for the determination of surface tension and angle of contact of mercury. (10)
18. b) What would be the pressure inside a small air bubble of 10^-4 m radius, situated just below the surface of water? Surface tension of water is 70×10^-3 N/m and the atmospheric pressure = 1.012×10⁵ N/m².                                     (2.5)
19. a) Explain the transport Phenomena. Derive an expression for the coefficient of viscosity of a gas on the basis of the kinetic theory of gases. (10)
20. b) How does the coefficient of viscosity of gas depend upon temperature and pressure ?                                                                         (2.5)
21. a) Obtain the Classius inequality relation of thermodynamics (7.5)
22. b) Derive Ehrenfest’s equation for a second order phase transition. (5)
23. Explain Joule-Kelvin experiment and inversions curve and obtain an expression for Joule-Kelvin co-efficient.

 

   

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