Download CBSE Guess Paper Physics Class XII (12th) 2009

Guess Paper – 2009

Class – XII

Subject – Physics (SET-2)

Time Allowed : 3 hours                            Maximum Marks : 70

(a)    All questions are compulsory (b)     Question numbers 1 to 8 are very short answer type questions, carrying one mark each. (c)     Question numbers 9 to 18 are short answer type questions, carrying two marks each. (d)     Question numbers 19 to 27 carry three marks each. (e)     Question numbers 28 to 30 are long answer type questions, carrying five marks each. (f)     Use of calculators is not permitted. However, you may use log tables, if necessary.

Q.1> How many protons will have the total charge of 1C

Q.2> What is the dielectric constant of Silver?

Q.3> Find the electric field b/w 2 metal plates 5mm apart, connected by a 12V battery.

Q.4> Write the value of Coulomb constant ( K ) and mention its units.

Q.5> Find the work done in placing a charge of  8nC on a condenser of capacity 100micro-farad.

Q.6> Define equipotential surface and draw EPS for a single point charge.

Q.7> What is the angle b/w electric dipole moment and the electric field on its equatorial point?

Q.8> Sketch electric field lines for a dipole.

Q.9> The electrostatic force on a small sphere of charge 4C due to another small sphere of charge 8C in air is F. What is the distance b/w the 2 spheres. What is the force on the –8C sphere due to the first sphere. What will the force be if the spheres are dipped in a liquid  having dielectric constant K

Q.10> An electron is placed inside a capacitor ( 5?f ). It is found to be stationary i.e. its weight is balanced by the electrostatic force. Find the potential difference across the plates of the capacitor if the plate area is A.

Q.11> Equal charges each of 1C are placed at x = 0, 2 , 4 , 8 , 16 cm.  Find the force experienced by the charge at x=2 cm. Define electric field intensity at x=2 and find it.

Q.12> What is the work done in moving a charge 100nC from point A to point B 5cms apart, where both points A and B lie on the same equipotential surface? Explain your answer.

Q.13> Define electric flux. Is it a vector quantity? Give its units. If the flux entering and leaving a closed surface is ?1 and ?2 find the charge inside that surface.

Q.14> Define electric potential. What is line integral of electric field over a closed loop?

Q.15> Can a positively charged object attract a neutral object? Explain briefly

Q.16> A uniform electric field E exists b/w the 2 charged plates as shown in the figure. What would be the work done in moving a charge q along the path ABCDA. Hence define conservative fields and give 2 properties.

Q.17> Write 2 differences b/w charge and mass.

Q.18> Calculate the potential at the center of a square of side ?2 m, which

carries at its 4 corner charges of 2nC , 1nC , -2nC , -3nC respectively.

Q.19> Two point charges 4q and q are fixed a distance 2m apart. Find the point on the  line joining them at which the net electric field intensity in zero. What is the potential at this point. If a charge of magnitude –3q is placed at this point, in which direction will it move. What will be its potential energy at this point?

Q.20> Charges of 4?C each are placed at the four corners of a

square of side 1m. Find the electric field and potential at the center.         What would these quantities be if one of the given charges were negative?                                                                   

Q.21> Three charges –Q1 , +Q2 , -Q3 are placed as shown in the figure. Find in vector form the force acting on Q2 charge.

Q.22> When 2 capacitors C1 and C2 are connected in series the net is 1.2 farad, when connected in parallel the net capacitance is 5 farad. Find C1 and C2.

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