LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIRST SEMESTER – APRIL 2012

PH 1502/PH 1501/1500 – PROPERTIES OF MATTER & ACOUSTICS

 

 

 

Date : 28-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

               PART – A

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

 

1. State Hook’s law.
2. Explain the term neutral axis in bending of a beam.
3. Distinguish streamline and turbulent motion of a liquid .
4. Explain the principle of Pirani Gauge.
5. Write down the unit and dimension of surface tension .
6. What happens when a capillary tube is dipped in water and mercury?
7. Mention any two conditions for causing interference in sound waves.
8. Find the wavelength of sound produced by a tuning fork of frequency 400Hz. Given velocity of sound wave is 320m/sec.
9. Define reverberation time

10. A hall of volume 5500m³ is found to have a reverberation time of 2.3 sec. The sound absorbing surface of the hall has an area of 750m². Calculate the average absorption coefficient.

 

PART – B

 

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

 

11. a) Derive the expression for the period of oscillation of a cantilever. (3+4.5)
12. b) Describe with necessary theory, the oscillation method to determine the Young’s

modulus of a cantilever. (Assume mass of the cantilever is negligible).

12. a) Discuss briefly the method of comparing coefficient of viscosities of two liquids using

Ostwald viscometer.                                                                                                                        (5+2.5)

1. b) What are the advantages of Ostwald viscometer ?
2. a) Explain how surface tension is accounted for using molecular theory. (4+3.5)
3. b) Explain the variation of surface tension with temperature.
4. Distinguish between progressive and stationary wave.
5. Write a note on any five applications of ultrasonics.

 

 

 

 

PART – C

 

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

    

16. a) Describe Koenig’s method for the determination of Young’s modulus of a beam. (9+3.5)
17. b) A uniform metal disc of diameter 0.1m and mass 1.2kg is fixed to the lower end of a torsion wire of

length 1m and diameter 1.4×10^-3m. Calculate the rigidity modulus of  the material of the wire,

if  period of oscillation is 2sec.

17. a) Explain the principle and working of a Knudsen gauge.             (9+3.5)
18. b) Calculate the mass of water flowing 10 minutes through a tube of 0.001m diameter and 0.4m long,

if there is a constant pressure head of 0.2m of water. Coefficient of water is 0.00082 Nsm^-2.

18. a) Describe the Jaeger’s method for the determination of surface tension of a liquid. (8+4.5)
19. b) Discuss the advantages and disadvantages of the method.
20. a) What is Doppler effect? (2.5+10)
21. b) Derive an expression for the change in frequency when i) observer is at rest and source is in

motion and ii) observer is in motion and source is at rest.

20. Discuss the salient points associated with acoustics of an auditorium.

 

 

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