Annamalai University 2011-1st Year B.Sc Physics , (Part–III –I) (Group – A –Main) 530 Properties Of Matter And Thermal - Question Paper

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B.Sc. Degree Examination, 2011
(Physics)
First Year
(Part–III Paper–I)
(Group – A –Main)

530. Properties Of Matter And Thermal Physics
May) (Time: three Hours
Maximum: 100 Marks

part - A
ans any TEN ques. (10×2=20)
All ques. carry equal marks

1. State Hookes legal regulations.
2. Give the limits to the value of Poissons ratio.
3. Define elastic fatigue.
4. Define surface energy. How it is related to surface Tension?
5. Give the unit and dimensions for viscosity.
6. How does surface tension vary with temperature?
7. Define effusion of gases.
8. State Ficks legal regulations of diffusion.
9. 1 gram molecule of a substance is dissolved in 100 cc of water at 0° . compute the depression of the freezing point produced.
10. Define coefficient of Thermal Conductivity and provide its unit.
11. What are dilatometers?
12. Define quantity coefficient expansion.
13. What are the essential strokes involved in a diesel engine?
14. What are reversible and irreversible processes?
15. State the principle of air conditioners.


part - B
ans ALL ques. (5×7=35)
All ques. carry equal marks

16. a) provide the theory of Torsional Oscillations for the determination of the rigidity modulus of a wire.(OR)b) What is a cantilever? find an expression for the depression at the free end of a thin light beam clamped horizontally at 1 end and loaded at the other end.
17. a) define how will you compare the viscosities of 2 liquids using Ostwarlds viscometer. (OR)b) discuss the U-tube method for determining the surface tension of a liquid.
18. a) State and discuss Ficks laws of diffusion. discuss how the diffusivity of a salt can be determined experimentally. (OR)b) State and discuss the laws of osmotic pressure. define an experiment to determine the osmotic pressure.
19. a) define an experiment to determine the pressure coefficient of a gas. (OR)b) define briefly how the coefficient of linear expansion of a solid can be determined with the help of an interference method.
20. a) describe entropy. Show that the entropy remains constant in a reversible process. (OR)b) describe efficiency of a Carnots engine. In a carnot engine of efficiency 0.2, the source temperature is 500K. obtain the efficiency of the engine when the source temperature is doubled.
part - C
ans any 3 ques. (3×15=45)
All ques. carry equal marks

21. Describe with necessary theory the koenigs method for the determination of youngs modulus of a beam.
22. Describe with theory, Quinckes method of finding the surface tension of mercury.
23. Deduce the relation ranging from the osmotic pressure and the elevation of boiling point of a solution. discuss how the molecular weight of the solute can be determined from the elevation of the boiling point.
24. Explain in detail the Forbes method of determining the thermal conductivity of a metal.
25. State and prove Carnots theorem. discuss in detail the working of a Petrol engine. _____

Earning:   Approval pending.