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CBSE XII Pre Boards I 2014 : PHYSICS with Answers (KV Chennai)

9 pages, 40 questions, 10 questions with responses, 11 total responses,

Kendriya Vidyalaya KV IIT Chennai
Kendriya Vidyalaya (KV), IIT Chennai

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KENDRIYA VIDYALAYA SANGATHAN, CHENNAI REGION Class-XII Common Pre-Board Examination-2013 - 14 Physics(Theory)-Marking Scheme 1. Electric field .it is a vector quantity . 2. I= P/V = 220 /60 =3.67 amp. 3. (1) (1) (1) 4. (1) 5. eddy currents (1) 6. (1) Or Diverging wavefront. 7. Transducer , Repeater 8. (1) I V (1) 9. Potential at every point is same. Proof : (1) (1) -210. Diagram : A (1) 6 F 3 F B 2 F (1) W (1) = (1) 12. Io = Eo / R = NBAw / R ( ) 50 0.3 2.5 60 / 500 = 4.5 amp ( ) Iii Maximum emf - correct answer ( ) Minimum emf ( ) - correct answer 13. (i) fringes width remains same but the fringes are coloured (ii) wavelength decreases in denser medium Fringe width decreases 14. gamma ray , yellow light , microwaves , radiowaves (1) ( ) ( ) (1) Justification (1) 15. wave length = (1) Since mass of Conclusion 16. Logic Symbol particle is more Kinetic Energy is less ( ) ( ) (1) Truth Table (1) Or For circuit diagram (1) For proper biasing (1) -3- 17. Diagram (1) Derivation (2) (1 ) = ( ) 0.61 = 1.22 (1) 19. Diagram (1) Derivation (2) 20. wave length = velocity / frequency = = 6 10-12m rays 2 uses 21. Diagram Derivation = 0.6 10-11 m (1) (2) (1) (2) 22. R.P = wavelength / 2nsin (i) frequency increased R.P decreases (1) (ii) wavelength increased R.P Increases (1) (iii) aperture is increased R. P decreases (1) 23. Expression for radius of nth orbit electron (1) Expression for T.E (1) Total Energy is ve of Kinetic Energy ( ) Potential Energy 24. ( ) Curve with labeling (1 ) Explanation for fission and fusion (1 ) -4- 25. Block diagram (2) Labelling (1) (Or) Ground wave definition (1) Space wave definition (1) Sky wave definition (1) 26.(a) Values displayed by Suhasini: (i) Knowledge about MRI (ii) Helped in taking proper decision and arranged the cost of MRI (iii) Showed his empathy, helping attitude and caring nature. (1) F B M 900 F= 1.6 x 10-15N M 0 & 1800 F=0 (1) (c ) Force will be minimum if charge particle moves parallel or anti-parallel to the magnetic field lines. (1) 27. AC Generator diagram (2 ) E.M.F expression (1 ) Reason (1) (Or) Transformer diagram (1) Working (2) Power losses (2) 28. Diagram (2) -5- Derivation (3) (Or) Definition (1) Derivation (3) Diagram (1) 29. Diagram of oscillator (2) Working (2) Wave form (1) (Or) Forward bias and reverse bias curve (2) Working (2) Frequency of output (1) *************************

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Additional Info : CBSE Class XII Pre Board I Solved Question Paper 2014 Physics
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