06%20-%20Physics%20-%20July%202008

06%20-%20Physics%20-%20July%202008 - Time : 3 hours 06 -...

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Time : 3 hours 06 - Physics - July 2008 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 force acting between two point charges kept at a certain distance is F. Now magnitude of charges is doubled and the distance between them is halved. The force acting between them is ….. ( a ) F ( b ) F / 2 ( c ) 16F ( d ) 4F 2. A parallel plate capacitor is charged. A dielectric slab is introduced in it. The ….. will remain constant amongst the following options. ( a ) capacitance ( b ) charge ( c ) energy ( d ) potential difference 3. The rating of our car battery of 12 V is 80 A, which means that 80 A of current will flow when the battery is connected to a conducting wire. The internal resistance of the battery will be ….. Ω ( ohm ). ( a ) 0.015 ( b ) 0.15 ( c ) 0 ( d ) 1.5 4. If ….. is stationary, no magnetic force acts on it. ( a ) a coil carrying current ( b ) magnetic dipole ( c ) an electric dipole ( d ) a straight conductor carrying current 5. Neutral temperature of a thermo - couple is 270 ° C and temperature of the cold junction is 15 ° C, then the temperature of the inversion is ….. ° C. ( a ) 285 ( b ) 255 ( c ) 525 ( d ) 575 6. What is magnetization intensity for vacuum ? ( a ) positive ( b ) negative ( c ) zero ( d ) infinity 7. A place where the vertical component of the earth’s magnetic field is zero has angle of dip = ….. ( a ) 45 ° ( b ) 90 ° ( c ) 0 ° ( d ) 60 ° 8. The power in an A. C. circuit is given as P = V rms I rms cos δ . The power factor at the resonance frequency of a series L - C - R circuit will be ….. ( a ) zero ( b ) 1 / 2 ( c ) 1 / 2 ( d ) 1
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Time : 3 hours 06 - Physics - July 2008 Marks : 100 Pg - 2 9. According to Maxwell, the changing electric field produces ….. ( a ) electric current ( b ) magnetic field ( c ) emf ( d ) radiation pressure 10. The distance between two slits in Young’s experiment is 0.1 mm and the distance of the screen from the slit is 100 cm. If the wave - length of light is 5000 A ° , the width of the fringe is ….. ( a )
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06%20-%20Physics%20-%20July%202008 - Time : 3 hours 06 -...

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