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Class 12th CBSE 2014 Physics Paper Set 3

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Class-12th CBSE
Subject- Physics Set 3
year-2014    

Here is some questions:-
1. Define the term 'drift velocity' of charge carriers in a conductor and write its relationship with the current flowing through it.
2. Plot a graph showing variation of current versus voltage for the material GaAs.
3. A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ?
4. Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why ?

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