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12th Physics Practice paper-04

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PHYSICS Class II PreUni Plus 2016-17 Practice Paper - 04 (Take Home) Max. Marks Duration Date 70 3 Hrs. 15 Min. February, 2017 Instructions 1. Numerical problems solved without writing the relevant formulae carry no marks. 2. Answers without relevant diagram / figure / circuit wherever necessary will not carry any marks. 3. Steps adopted in solving problems should be clearly shown. 4. Draw a line using pen at the end of each answer. Do not overwrite. PART - A I. Answer the following questions (one mark each) [10 1 = 10] 1. What is the shape of trajectory of a charged particle within the dees of a cyclotron? 2. How does the susceptibility of a diamagnetic substance vary when its temperature is increased from 300 K to 330 K? 3. Write the expression for potential energy of a bar magnet in the most stable position in a uniform external magnetic field. 4. State Faraday s law of electromagnetic conduction. 5. What is displacement current? 6. What is the value of measured radiation pressure of visible light? 7. A point source is placed at the principal focus of a biconvex lens. What is the shape of the wavefront in the light emerging out of the lens? 8. What is the shape of equipotential surface due to a point charge? 9. What are isotones? 10. Name the type of radio-waves used for line-of-sight (LOS) communication. PART - B II. Answer any FIVE of the following questions (two marks each) [5 2 = 10] 11. Draw the schematic labeled diagram of van de Graaf generator. 12. Write the values of susceptibility and relative permeability of a material in super-conducting state. 13. Draw the impedance diagram as applied to a series LCR circuit. Write the expression for power factor of the circuit. 14. Current in a coil changes from 5 A to zero in 0.1 s. If the average emf induced in the coil is 100 V, calculate the self inductance of the coil. 15. Explain the terms red shift and blue shift used in astronomy. 2P1617PPP4 1

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