Posted Date: 09 Mar 2010      Posted By:: Vijay Kumar Vishwakarma    Member Level: Diamond  Points: 5 (Rs. 1)

# 2010 Tamil Nadu Open University B.Sc Physics Model Question Paper for B.Sc. physics(PROPERTIES OF MATTER AND ACOUSTICS) Question paper

 Course: B.Sc Physics University/board: Tamil Nadu Open University

SECTION A (10 X 2 = 20)

Unit I (Elasticity)

1. Define “Modulus of Elasticity”. Give its units. (Definition and knowledge)
2. State the relation between q, n and ?. (Statement)

Unit II (Bending of beams)

3. Explain why steel girders and rails are made in the form of I. (Analysis and Application)
4. How will you differentiate between uniform and non-uniform bending? (Analysis)

Unit III (Surface Tension, Low pressure)

5. The excess of pressure inside a soap bubble is
T 2T 4T
(a) --- (b) ----- (c) ----- (d) zero (analysis)
r r r

6. What is the principle of a molecular pump? (Application)

Unit IV (Viscosity, Hydrodynamics)

7. The rate of flow of a liquid through a capillary tube depends on
(a) pressure head (p) and radius of the capillary tube (r) only
(b) Length (l) and radius of the capillary tube (r) only
(c) Pressure head (p) and coefficient of viscosity of the liquid (?) only
(d) All the four quantities p, r, l and ?. (Knowledge of facts)

8. Name the instrument used for measuring the domestic consumption of water. (Application)

Unit V (Acoustics)

9. State and define the unit of sound intensity. (Definition)

10. The volume of an auditorium is 600 m3 The average absorption coefficient of the materials is .24. If the reverberation time is .86 s, calculate the total surface area of the auditorium (Application)

SECTION B (5 X 6 = 30)

11. (a) Define Poisson’s ratio. What are the theoretical limits to the value of Poisson’s ratio?
or
(b) Derive the expression for the period of oscillation of a torsion pendulum. (Derivation)

12. (a) A steel bar, 0.3 m long, 2 x 10 -2 m broad and 2 x 10 -3 m thick is clamped at one end and loaded at the other with a mass of 0.01 kg. Calculate the period of vibration of the bar, neglecting the effect of the weight of the bar. (Young’s modulus for steel = 20 x 1010 Nm-2 )
or
(b) In an experiment a rod of diameter 0.0126 m was supported on two knife edges, placed 0.7 m apart. On applying a load of 0.9 kg. exactly midway between the knife edges, the depression at the middle point was observed to be 0.00025 m. Calculate the Young’s modulus of the substance. (Application)

13. (a) Bring out the relation between vapour pressure, surface tension and radius of curvature. Hence explain the formation of rain drops. (Derivation and application)
or
(b) How will you produce low pressure? (Concept and construction)

14. (a) Give a brief account of lubrication. (Knowledge, application, synthesis)
or
(b) Bring out the analogy between liquid flow and current flow (Synthesis)

15. (a) What are the characteristics of musical note?
Explain consonance and dissonance. (Classification and Analysis)
or
(b) What are the requirements of a good auditorium. (Application, Synthesis)?

Section C (5 x 10 = 50)

16. (a) Derive the relation between the elastic constants. (Derivation)
or

(b) Obtain an expression for the couple per unit twist of a wire. Explain how the rigidity modulus of a wire can be determined using a torsion pendulum. (Derivation and illustration)

17. (a) With relevant theory, explain how the Young’s modulus of the material of a cantilever can be determined. (Theory and illustration)
or
(b) Obtain an expression for internal bending moment. Explain how Young’s modulus can be determined by non-uniform bending. (Theory, experiment and application)

18. (a) Explain Jaegar’s method for studying surface tension and its variation with temperature. (experiment, illustration)
or
(b) How is low pressure measured using Knudsen’s gauge? Why is it called an absolute gauge? How is leakage detected? (experiment, analysis and application)

19. (a) Derive Poisseuille’s expression for the rate of flow of a liquid through a capillary tube. Describe an experimental method of determining the coefficient of viscosity of a liquid.
What happens when the temperature of the liquid is increased? (Derivation and experiment)
or
(b) Explain Bernoulli’s principle and its applications. (concept and applications)

20. (a) State Fourier’s theorem. Apply it to a saw tooth wave. (Theory, application and analysis)
or
(b) Discuss the production, properties and applications of ultrasonics. How are they detected? (Theory, applications and analysis)

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