BSc Physics SEM III ATKT PHYSICS PAPER III Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate maximum marks

1. Q1 A) Select correct answer reverberation time for speech is about seconds 12 marks
   • a) b)2to2.5 c)3to4 d) 4 to5 and cladding refractive index of 1.6 and 1.5, the numerical aperture value is Dialysis is a process that function 4 amount of fluid in the human body is approximately body 5 through Optical fiber is 6 Smallest unit of energy
   • B) Answer in one sentence What is dead effect in acoustics? 2 What is viscosity? critical temperature with reference to superconductor 3
   • C) Fillin the Blanks 1 The wavelength of light emitted from Ne laser is approximately 2 that is able to maintain its structure and reproduce is the net movement of molecules or atoms from a region of high concentration to a region of low concentration 4 Property of developing voltage when pressure is applied Property of inducing magnetic field opposite to the applied magnetic 5
2. Q2 A) Attempt any one Write a short note on: 8 marks
   • 2. State any eight applications of optical fibers Attempt any one (8) the basic principle of a laser with the help of a diagram Explain the following properties of laser:
   • (a) Coherence
   • C) Attempt any one 1 a volume of 2250 m’. Its total absorption is equivalent to 100 of open window. What will be the effect on the reverberation time if audience fills the hall and thereby increase the absorption by another 100 2 Ahall of volume 5500 metre? is found to have a reverberation time of 4
   • 2.3s. The sound absorbing surface of the hall has an area of 750 m? Calculate the average absorption coefficient
3. Q3 A) Attempt any one Discuss the biological aspects of osmosis and diffusion 2 Explain voltage clamp technique to measure ion currents through the membranes of excitable cells 8 marks
   • B) Attempt any one What is action potential? Discuss types of action potential and explain characteristic of action potential 2 State and explain Fick’s laws of diffusion 8
   • C) Attempt any one Determine the resting potential across the cell membrane given that concentrations of K* (inside 400 mM, outside 10 mM) of Na* ( inside 50mM, outside 460 mM) and of Cl (inside 40 mM, outside 540mM) and the respective permiabilities of Kt, Na* and Cl are 1, 15 and 0.1 2 Explain Hodgkin-Huxley model of action potential 4
4. Q4 A) Attempt any one any four important characteristics of nano-materials & any two 2 any four important characteristics of dielectric materials & any 8 marks
   • B) Attempt any one Mention any four important characteristics of alloys & two applications Mention any four important characteristics of insulating materials & any 8
   • C) Attempt any one Attempt any Four sound absorption coefficient. Explain the method used to 2 State any five requirements of a good auditorium What are Prokryotic and Eukaryotic cells 4 Explain membrane potential. What are resting and action potentials? Define Pyroelectric effect & mention any one application 6 Define piezoelectric effect & mention any one application 4

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