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5015

March 2014
(For Scheme I Candidates only)

Second Year Higher Secondary Examination
Part- Ill

PHYSICS
Maximum : 60 Scores Time : 2 Hours Cool off time : 15 Minutes

(Genera/Instruction~ to Candidates :
• There is a 'cool off time' of 15 minutes in addition to the writing time of 2 hrs. • You are not allowed to write your answers nor to discuss anything with others · during the 'cool off time'. • Use the 'cool off time' to get familiar with questions and to plan your answers. • Read questions carefully before answering. • All questions are compulsory and only internal choice is allowed. • When you select a question, all the sub-questions must be answered from the same question itself. • Calculations, figures and graphs should be shown in the answer sheet itself. • Malayalam version of the questions is also provided. • Give equations wherever necessary. • Electronic devices except non programmable calculators are not allowed in the Examination Hall.
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SCORES

SCORES
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a) From the above figures which one corresponds to a typical (.1) semiconductor. b) Dimension of temperature coefficient a is _ _ __
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b) Compare Biot-Savart law with Coloumb's law for electrostatic field. (2) c) Give an expression for magnetic field on the axis of a circular current loop. (Expression only) .. (Y2) d) What is the value of Bat the centre of the loop ?
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b) Give an expression for the voltage and current in a transformer. (1)

8. A fascinating behaviour of the series RLC circuit is the phenomenon of resonance.
a) Explain Resonance in an LCR circuit. (2) b) Draw a graphical representation of variation of current amplitud~ im with frequency ro. (1) c) What do you mean by sharpness of resonance ? Explain it. (2)
5015
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13. De Broglie proposed the wave nature of elect ron s s uggesting matter vvaves. Find the mome ntu m , speed and De-Broglie wavelength of an electron (2) with Kinetic energy of 120 eV. 14. When a vapou r is excited at low pre ssure by passing an electric current through it, a spectrum is obtained. a) Draw a spectral series of emission lines in hydrogen . b) Name the different series of hydrogen atom .
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