CBSE Guess > Papers > Question Papers > Class XII > 2005 > Physics > Outside Delhi Set-III PHYSICS 2005 (Set III—Outside Delhi) Except for the following questions all the remaining questions have been asked in Set I & Set II. Q. 1. Two electric field lines never cross each other. Why? 1 Q. 2. Under what conditions is the force acting on a charge moving through a uniform magnetic field minimum?1 Q. 3. What is the power dissipated in an a.c circuit an which voltage and current are given by 1 Q. 4. In an experiment on photoelectric effect, the following graphs were obtained between the photoelectric current ( I ) and the anode potential (V). Name the characteristic of the incident radiation that was kept constant in this experiment. 1 Q. 5. How does the effective power radiated by an antenna vary with wave length? 1 Q. 7. Mention the factors on which the resonant frequency of a series LCR circuit depends. Plot a graph showing variation of impedance of a series LCR circuit with the frequency of the applied a.c. source. 2 Q. 10. How do you convert a galvanometer into an ammeter? Why is an ammeter always connected in series? 2 Q. 11. Two fixed point charges -Me and +e units are separated by a distance 'a'. Where should the third point charge be placed for it to be in equilibrium? 2 Or A Q. 17. A double convex lens made of glass of refractrive index 1.5 has its both surfaces of equal radii of curvature of 20 cm each. An object of 5 cm height is placed at a distance of 10 cm from the lens. Find the position, nature and size of the image. 3 Q. 22. The half-life of Physics 2005 Question Papers Class XII
CBSE 2005 Question Papers Class XII
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