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# Vinoba Bhave University 2008 B.Sc Physics Part -2 - Question Paper

Friday, 01 February 2013 09:10Web

Physics

 Total Pages8 2008 VBPh(2)S/G (vii)    Interference fringes can be obtained by: I a \ The division of wavefront only (b)    The division of amplitude only (c)    Either the division of wavefront or amplitude (d) Neither the division of wavefront or amplitude. (viii)    Newtons ring are the fringes of: ()    Equal thickness ()    Equalinclination (c)    Equal area ' (d)    Equal intensity. (/a) The circular fringes produced in Michelsons interferometer are: [a)    Curves of equal thickness (b)    Curves of equal inclination (c)    Identical with Newtons ring [d)    Localised at one of the mirror. (x) KirchofTs law are applicable to: ()    D.C. only ()    A.C.only (e) A.C. and D.C. both id) None of the above. GROUPC Answer any four of tfie following 3.    Discuss the growth and decay of current through L-R circuit.    10 4.    Describe and explain the formulation of Newton's ring by reflected monochromatic light. Prove that in reflected light diameters of dark rings are proportional to the square roots-of the natural numbers.    10 5.    Explain clearly what causes reverberation time in a hall and how it can be minimised.    10 6.    Describe the construction and working of a Febry-Parot interferometer and deduce an expression for the intensity distribution of the fringes.    10 7.    State and explain Kirchoff's law. Apply it to obtain the balance condition ofa Wheatstone bridge. 10 8.    Obtain an expression for the power in an a.c. circuit contains L, C and R. What is power factor ? iO Answer from all the Groups as per direction The figures in the right-hand margin indicate marks Candidates arc required to give their answers in their own words as far as practicable GROUP-r-A (Compulsory) 1. Indicate correct answer in each of following-: the 1 x 10 (/') Intensity of sound depends upon: \a) Amplitude ib) Souare of amplitude (c) Inverse of amplitude (/>') Sonar is a technique: (a)    Named after its inventor SONAR (b)    Fitted m an aeroplane (c 1 Of sound navigation and ranging (d) Like radar fitted in motor cars of modem age. (iii \ Which of the following actions would be more effective in decreasing the reverberation time in an auditorium in which the audiance occupies wooden chairs ? (a)    Requiring the audiance to rise from their seats (b)    Opening the window (c)    Opening the doors of the adjoing room. (iv) The speed of the transverse wave along a string depends upon: (a) Tension of the string () Length of the string (cl Density of the medium (d)    Temperature of the medium. (v) To understand the flow of current in the network of conductors use is made of: [a)    Ohms law [b)    Kirchoffslaw [c)    Joules law (