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Winter Break Home Work-2015Class XIIComputer Science:Pre-board Papers – Set A, B & CLearn Theory of Chapter 14 (Networking Concepts).Project must be completed in all respect.English:Class XII A & B-(In Separate notebook)-02 SETS OF 1st Pre Board Question Paper-03 sets of Previous Year/Any other Question paperBiology:Physics:.Solve preboard papersSolve sample papers from study materialSolve the following questions.Explain with the help of a circuit diagram, the working of a photo-diode. Write briefly how it is used to detect the optical signals.State Huygen’s principle. Using this principle draw a diagram to show the two media gets refracted when it propagates from a rarer to a denser medium. Hence verify Snell’s how a plan wavefront incident at the interface of law of refraction.A) State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf’s of two primary cells. Obtain the required expression used for comparing the emfs.Write two possible causes for one sided deflection in a potentiometer experiment.State Kirchhoff’s rules for an electric network. Using Kirchhoff’s rules, obtain the balance condition in terms of the resistances of four arms of Wheatstone bridge.A) Derive the expression for the torque on a rectangular current carrying loop suspended in a uniform magnetic field.B) A proton and a deuteron having equal momenta enter in a region of uniform magnetic field at right angle to the direction of the field. Depict their trajectories in the field.vi) Write Einstein’s photoelectric equation and point out any two characteristic properties of photons on which this equation is based.Briefly explain the three observed features which can be explained by this equation.A) Using Biot- Savart’s law, derive the expression for the magnetic field in the vector form at a point on the axis of a circular current loop.B) What does a toroid consist of? Find out the expression for the magnetic field inside a toroid for N turns of the coil having the average radius r and carrying a current I. Show that the magnetic field in the open space inside and exterior to the toroid is zero.viii) A) Define electric dipole moment. Is it a scalar or a vector? Derive the expression for the electric field of a dipole at a point on the equatorial plane of the dipole.B) Draw the equipotential surfaces due to an electric dipole. Locate the points where the potential due to the dipole is zero.Chemistry:1.Sove the 3 sets Pre Board Question paper2.Solve the 5 Previous year CBSE board Q.Paper3.Write all formulae of phy.Chem & practice numericals 4.Ing.Chem.-Write all reasoning questions,draw structure of all pds.,complete all the .Chem.-Write all name reactions,Distinguishing between comounds(one test one example),reasoning questionEconomics:Solve 3sets of pre board 1 in notebookRevise the whole syllabus for pre board 2Class test will be held on 6/1/2016 of the following chapterCircular flow of incomeBasic concept of macro economicsMoney and bankingMaths:Hindi:Business Study:Account: ................
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