04%20-%20Physics%20-%20July%202007

04%20-%20Physics%20-%20July%202007 - Time : 3 hours 04 -...

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Time : 3 hours 04 - Physics - July 2007 Marks : 100 Pg - 1 Instructions : 1. There are 4 Sections and total 60 questions in this question paper. 2. Symbols used in this question paper have their usual meanings. 3. Log table or simple electronic calculator can be used. 4. Write new Section on a new page. Follow the sequence. S E C T I O N A Questions 1 to 16 are multiple choice questions. Each carries ONE mark. Choose correct answer ( a, b, c, d ) from the given alternatives and write it. 16 ( 1 ) The electric force acting between two point charges kept at a certain distance in vacuum is α . If the same two charges are kept at the same distance in a medium of dielectric constant k, the electric force acting between them is ….. ( a ) α ( b ) k α ( c ) k 2 α ( d ) k α ( 2 ) A particle having mass m and charge q, is initially kept stationary in a uniform electric field E. It is then released. Calculate the kinetic energy of the particle, when it travels distance y. ( a ) qEy 2 ( b ) qE 2 y ( c ) qEy ( d ) q 2 Ey ( 3 ) There are 200 turns per centimeter length of a very long solenoid. When 2.5 A current passes through it, magnetic field at its centre, on its axis is ….. T. ( a ) 3.14 x 10 - 2 ( b ) 628 x 10 - 2 ( c ) 12.56 x 10 - 2 ( d ) 6.28 x 10 - 2 ( 4 ) The maximum amount of current which can be drawn from the battery, whose emf is equal to 12 V and having 0.4 Ω internal resistance will be equal to ….. ( a ) 24 A ( b ) 30 A ( c ) 4.8 A ( d ) 48 A ( 5 ) Thermoelectric constants of a thermocouple are α and β . Thermoelectric power for this thermocouple at inversion temperature is ….. ( a ) α ( b ) - α ( c ) β α ( d ) - β α ( 6 ) If a charged particle is moving through a uniform magnetic field, then its ….. ( a ) both momentum and kinetic energy change. ( b ) momentum changes but kinetic energy does not change. ( c ) momentum and kinetic energy do not change. ( d ) kinetic energy changes but momentum does not change. ( 7 ) A magnetic needle hung using a silk fibre oscillates in earth’s magnetic field. If the temperature of this needle is raised beyond the Curie temperature of the material of the needle, then ( a ) the needle will stop oscillating. ( b ) the periodic time of the oscillations will decrease. ( c ) the periodic time of the oscillations will increase. ( d ) the periodic time of the oscillations will not change.
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Time : 3 hours 04 - Physics - July 2007 Marks : 100 Pg - 2 ( 8 ) Maximum value of current is obtained in an A. C. circuit with resonant frequency when L = 0.5 H and C = 8 μ F. The angular frequency of the alternating voltage will be … rad/s. ( a )
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04%20-%20Physics%20-%20July%202007 - Time : 3 hours 04 -...

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