#1
22nd November 2014, 09:08 AM
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CBSE 12th Physics question paper
Hi I want the question paper of Physics of 12th CBSE so can you provide me?
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#2
22nd November 2014, 10:22 AM
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Re: CBSE 12th Physics question paper
As you want the question paper of Physics of 12th CBSE so here I am providing you. 12th CBSE physics question paper Q How does one explain increase in resistivity of a metal with increase of temperature ? Q Write the condition under which an electron will move undeflected in the presence of crossed electric and magnetic fields. Q Give one example of broadcast mode of communication. Q Draw the shape of the wavefront coming out of a convex lens when a plane wave is incident on it. Q Two point charges q and – 2q are kept ‘d’ distance apart. Find the location of the point relative to charge ‘q’ at which potential due to this system of charges is zero. Q An electric dipole is placed in a uniform electric field E with its dipole moment p parallel to the field. Find (i) the work done in turning the dipole till its dipole moment points in the direction opposite to E (ii) the orientation of the dipole for which the torque acting on it becomes maximum. Q (a) How is an electromagnet different from a permanent magnet? (b) Write two properties of a material which make it suitable for making electromagnets. Q Distinguish between emf () and terminal voltage (V) of a cell having internal resistance ‘r’. Draw a plot showing the variation of terminal voltage (V) vs the current (I) drawn from the cell. Using this plot, how does one determine the internal resistance of the cell ? Q (a)Define the term ‘stopping potential’. (b) Plot a graph showing the variation of photoelectric current as a function of anode potential for two light beams of same intensity but of different frequencies, v1 and v2 (v2 > v1). Write the conditions for observing a rainbow. Show, by drawing suitable diagrams, how one understands the formation of a rainbow. Q (a) State the underlying principle of a potentiometer. Why is it necessary to (i) use a long wire, (ii) have uniform area of cross-section of the wire and (iii) use a driving cell whose emf is taken to be greater than the emfs of the primary cells? (b) In a potentiometer experiment, if the area of the cross-section of the wire increases uniformly from one end to the other, draw a graph showing how potential gradient would vary as the length of the wire increases from one end. Q (a) A capacitor is connected in series to an ammeter across a d.c. source. Why does the ammeter show a momentary deflection during the charging of the capacitor ? What would be the deflection when it is fully charged ? (b) How is the generalized form of Ampere’s circuital law obtained to include the term due to displacement current? CBSE 12th physics question paper For more questions here I am attaching two pdf file................... |