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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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

 

CC 01

FIRST SEMESTER – November 2008

PH 1500 – PROP.OF MAT.& THERMAL PHYSICS

 

 

 

Date : 12-11-08                       Dept. No.                                          Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

       Answer ALL questions:                                                                                          (10×2=20 Marks)

 

1. What is an equipotential surface? What is the amount of work done in moving a mass between two points of an equipotential surface?
2. Define the term neutral axis and internal bending moment.
3. Water flows through a horizontal capillary tube of 1mm internal diameter and length 50cm under pressure of a column of water 30cm in height. Find the volume  rate of  flow of water. Viscosity of water is 10^-3 Ns/m² .
4. What is surface tension? Mention its dimension.
5. Calculate the diameter of a gas molecule, given that the mean free path is 3×10^-5 cm and the number of molecules per cc is 3×10¹⁹ .
6. State two examples of transport phenomena.
7. What is a quasistatic process?
8. Calculate the change in entropy when 0.02kg of ice at 0C is melted into water at the same temperature.
9. What is an ideal gas?

10. How is the boiling point of a liquid affected by the change in pressure?

 

PART B

      Answer any FOUR questions:                                                                        (4×7.5=30 Marks)

 

11. Explain the terms i) gravitational field, ii) gravitational potential and iii) gravitational

potential energy.

12. a) Show that the excess of pressure inside a soap bubble is 4T/R.          (5)
13. b) Calculate the excess pressure inside a soap bubble of radius 3×10^-3 Surface tension

of soap solution is 0.02N/m.                                                                                                      (2.5)

13. Derive an expression for the pressure of a gas on the basis of kinetic theory of gases.
14. Show that the total change in entropy in a reversible process is zero.
15. Derive an expression for Joule-Kelvin coefficient.

 

PART C

      Answer any FOUR questions:                                                                       (4×12.5=50 Marks)

 

16. Define a cantilever. Obtain the expressions for the depressions produced at the free end of a
17. i) light and   ii) heavy cantilever.                                                                                          (2.5+5+5)
18. Describe with relevant theory the Quincke’s method for the determination of i)surface

tension and   ii)angle of contact of mercury.                                                                          (4.5+4+4)

18. Define coefficient of viscosity. Derive an expression for the coefficient of viscosity on the

basis of kinetic theory of gases.                                                                                             (2.5+10)

19. Derive Maxwell’s thermodynamical relations.
20. a)Derive the i)first and ii) second latent heat equations.                   (5+5)

b)Discuss the effect of change of pressure on the melting point of substances.                          (2.5)

 

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       LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

XC 01

B.Sc. DEGREE EXAMINATION – PHYSICS

FIRST SEMESTER – April 2009

PH 1500 – PROP.OF MAT.& THERMAL PHYSICS

 

 

 

Date & Time: 20/04/2009 / 1:00 – 4:00            Dept. No.                                                   Max. : 100 Marks

 

 

PART- A

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

1. State Newton’s second law of motion and obtain the unit of force.
2. A metal disc of mass 1 kg and radius 0.1m is suspended at its centre by a wire of length 70 cm and radius 0.6 mm. The period of torsional oscillation is found to be 2.6 seconds. Calculate rigidity modulus.
3. Give the expression for the energy stored in a stretched wire.
4. State Hooke’s law.
5. Write a brief note on lubricants.
6. State Graham’s law of diffusion.
7. Give two examples of Transport phenomena.
8. What are intensive and extensive variables?
9. Define the concept of entropy.
10. Define latent heat of vaporization and write its unit.

PART- B

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

11. a) Explain gravitational field and gravitational potential. ( 4.5)
12. b) Discuss the variation of acceleration due to gravity with altitude.    (3)
13. a) State Newton law of viscous flow.    (3)
14. b) Discuss Meyer’s modification of Poiseuille’s formula for the rate

of  flow of gas through a capillary tube.                                                  (4.5)

13. Describe Quincke’s drop method of finding the surface tension of Mercury.

14.a) Prove that  change in entropy in a reversible process is zero.                     (5.5)

1. b) Give any two conditions for reversibility of a process.                    (2)
2. a) Derive Ehrenfest’s equation for second order phase transition. (5.5)
3. b) Give two examples of second order phase transition.                              (2)

PART- C

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

 

16. a) Derive the relation between the various elastic constants of a material. (8.5)

 

2. b) The modulus of rigidity and poisson’s ratio of the material of a wire are 2.87

x10¹⁰ N/m² and 0.379 respectively. Find the value of young’s modulus of

the material of the wire.                                                                                           (4)

 

17. a) Explain the molecular theory of surface tension. (4)

 

1.  b) Derive an expression for the excess of pressure over a curved liquid

surface.                                                                                                            (8.5)

 

18. a) State any four postulates of the kinetic theory of gases. (4)

 

8. b) Deduce an expression for the pressure of a gas on the basis of this        (8.5)

 

 

19. Deduce the Maxwell’s thermo dynamical relations.

 

20. a) Explain Joule-Kelvin experiment. (6)

 

6. b) Obtain an expression for the Joule-Kelvin co-efficient. (6.5)

 

 

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