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paper CBSE Sample Paper 2010 2011 Physics Time

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					                           CBSE Sample Paper 2010-2011
                                                Physics

              Time allowed: 3 hours                                   Maximum Marks: 100


             All questions are compulsory
             There is no overall choice. However, an internal choice has been provided in
              one question of two marks, one question of three marks and all three
              questions of five marks. You have to attempt only one of the choices in such
              questions.
             Question numbers 1 to 8 are very short answer questions, carrying 1 mark
              each.
             Question numbers 9 to 18 are short answer questions, carrying 2 marks
              each.
             Question numbers 19 to 27 are short answer questions, carrying 3 marks
              each.
             Question numbers 28 to 30 are long answer questions, carrying 5 marks
              each.
             Use of calculators is not permitted. However, you may use log table if
              necessary.
             You may use the following values of physical constants wherever necessary.
             C = 3108 ms-1; h=6.6 10— 34-Js; e=1.610-19C; Mass of neutron mn
              1.610-27 kg
             Boltzmann’s constant K =1.38 10-23 JK-1
             Avogadro’s number NA = 6.0231023/mole



    Special Instructions:

    1. First fifteen minutes will be only to read the paper. Please start attempting the
         paper at 10:45 a.m.
    2. Attempt in any manner but please write the correct question number.
    3. Manage your time accordingly and try to attempt all the questions.
    4. Please write whatever is required in the answer sheet.
    5. Please checks that this question paper contains 30 questions
    6. First fill the OMR Sheet, then attempt the questions.




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    1.     A compass needles, pivoted about the horizontal axis and free to move in the
           magnetic meridian, is observed to point along the
          1.      Vertical direction at a plane A.
          2.      Horizontal direction at a plane B.
           Give the value of the angle of dip at these two places.
    2.     Give the value of the threshold voltage for a (i) silicon diode (ii) germanium diode.
    3.     State the two functions performed by a modem.
    4.     An electron is moving with velocity v along the axis of a long straight solenoid
           carrying current I. What will be the force acting on the electron due to the magnetic
           field of the solenoid?
    5.     The figure given below shows the variation of an alternating emf with time. What is
           the average value of the emf for the shaded part of the graph?




    6.     Write unit of impedance.
    7.     What is the change in resistance of an Eureka wire when its radius is halved and the
           length is reduced to one fourth of its original value.
    8.     Draw energy band diagram for extrinsic semiconductor.
    9.     Give the nature of V-I graph for (i) ohmic (ii) non-ohmic circuit elements. Given one
           example of each type.
    10.    Name the phenomenon associated with the production of back emf in a coil due to
           change of electric current through the coil itself. Name and define the SI unit used
           for measuring this characteristic of the coil.
    11.    Fig. shows a 2.0 V potentiometer used for the determination of internal resistance of
           a 1.5 V cell. The balance point of the cell in open circuit is 76.3 cm. When a resistor
           of 9.5 is used in the external circuit of the cell, the balance point shifts to 64.8 cm.
           length of the potentiometer wire. Determine the internal resistance of the cell.




    12.    A given p-n junction is biased in two different ways as shown in the figure. Identify
           the type of biasing used in each case. What is the effect of these biasings on the
           barrier potential across the given p-n junction?
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   13. Find the position of the image formed by the lens shown in the figure.




        Another lens is placed in contact with this lens to shift the image further away from the
        lens. What is the nature of the second lens?

   14. A nucleus of mass M initially at rest splits into two fragments of masses (M>M’). Find
       the ratio of de-Broglie wavelengths of the two fragments.
                                                Or
       Calculate the ratio of de-Broglie wavelength associated with a Deutron moving with
       velocity 2v and an alpha particle moving with velocity v.
   15. The output of an unregulated dc power supply needs to be regulated. Name the device
       that can be used for this purpose and draw the relevant circuit diagram. also draw its
       characteristic curve
   16. The given figure shows a network of resistance. Name the circuit so formed.




        What is the current flowing in the arm BD of the circuit? State the two laws used to find
        the current in different branches of this circuit.

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   17. Write the relation between angle of incidence (i) the angle of emergence (e), the angle
       of prism (A) and the angle of deviation () for rays undergoing refraction through a
       prism. What is the relation between i and e for rays undergoing minimum deviation?
       Using this relation obtain an expression for the refractive index () of the material of the
       prism in terms of A and angle of minimum deviation.
   18. Define the terms (i) disintegration constant and (ii) half life of radioactive nucleus.
       Obtains the relation between the two.
   19. Explain amplitude modulation. A modulating signal has zero dc component and peak to
       peak voltage of 11V. It is used to amplitude modulate a carrier of peak voltage of 10 V.
       Calculate the modulation index.
   20. An electric dipole with moment is placed in a uniform electric field of intensity . Write the
       expression for the torque experienced by the dipole. Identify two pairs of perpendicular
       vectors in the expression. Show diagrammatically the orientation of the dipole in the
       field for which the torque is (i) maximum (ii) half the maximum value (iii) Zero.
   21. Obtain an expression for the magnetic moment of an electron, moving with a speed ‘v’,
       in a circular orbit of radius ‘r’ . State the rule to find its direction. How does this
       magnetic moment change when (i) the frequency of revolution is doubled (ii) the orbit
       radius is halved?
   22. Electromagnetic waves with wavelength
                 are used to treat muscular strain.
                 are used by a FM radio station for broadcasting.
                 are used to detect fracture in bones.
                 are absorbed by the ozone layer of the atmosphere.
       Identify and name the part of electromagnetic spectrum to which these radiations
       belong. Arrange these wavelengths in decreasing order of magnitude.
   23.Define mass number (A) of an atomic nucleus. Assuming the nucleus to be spherical,
       give the relation between mass number (A) and the radius (r) of the nucleus.
       An electron and a photon each have a wavelength of 1.00 nm. Find (a) Their momenta
       (b) the energy of the photon and (c) the kinetic energy of electron.
       What is the ratio of the other magnitude of density of nuclear matter and density of
       ordinary matter?
   24. For the transistor shown here, identify the (i) type of transistor used and (ii) biasing
       configuration employed.




   The output characteristics of he transistor, for this biasing configuration area as shown


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   Use these graph to estimate the value of the current amplification factor for the transistor
       for VCE = 3V

   26. Obtain an expression for the energy stored in a parallel plate capacitor. In the following
       figure, the energy stored in C4 is 27J. Calculate the total energy stored in the system.




   27. Following figure shows an experimental set up similar to young’s double slit experiment
       to observe interference of light.




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          Here SS2 –SS1 =
          Write the condition of (i) constructive (ii) destructive interference at any point P in term
          of path difference S2P – S-1P.
          Does the central fringe observed in the above set up lie above or below O? Give reason
          in support of your answer.
                                   
          Yellow light of wavelength 6000 produces fringes of width 0.8 mm in Young’s double
                               4
          slit experiment. What will be the fringe width if the light source is replaced by another
                               
          monochromatic source of wavelength 7500 and separation between the slits is
          doubled?
                                                 Or
          Draw a graph showing the variation of intensity with angle in a single slit diffraction
                                          
          pattern. Explain why the intensity of the first secondary maximum is much less than
                                          A
          that of the first secondary maximum is much less than that of the central maximum.
                                                        
                                                                 A
          Light of wavelength 6000 , is used to illuminate a slit of width 0.1 mm. Obtain the
          angular position of the first minimum in the resulting diffraction pattern. What will
          happen to the intensity of the central maximum if the width of the slit were to be
          reduced to 0.05 mm?

                                  
    28. The given graphs (a) and (b) represent the variation of the opposition offered by the
                                  A of alternating current, with frequency of the applied emf.
        circuit elements to the low
        Identify the circuit element corresponding to each graph. A circuit is set up by
                                                     
        connecting L=100 mH, C=5 F and R =100 in series. An alternating emf of
                        500 
           (150 2volt,      
                          of Hz is applied across this series combination. Calculated the
          impedance of the circuit. What is the average power dissipated in (a) the resistor (b)
          the capacitor (c) the inductor and (d) the complete circuit?




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          State Lenz’s Law. The energy E, required to build up a steady current I, in a given coil,
          varies with I in the manner shown. Calculate the self inductance of the coil. A circular
          coil of radius r, is placed co-axially with another circular coil of radius R (R>>r) with the
          centres of the two coils coinciding with each other. Obtain an expression for the mutual
          inductance of this pair of coils.

     29. State Gauss's Theorem.Apply this theorem to obtain the expression for the electric field
         at a point due to at infinitely long uniformly charged straight wire
        The electric field components in the fig. shown are Ex =  x ½, Ey = Ez = 0, in which
          = 800 N/cm ½, Calculate (a) the electric flux through the cube (b) the charge within
         the cube. The side of cube a = 0.1




         Describe the construction and working of a Van de Graaff generator with the help of a
         labeled diagram. Two charged conducting spheres of radii a and b are connected to
         each other by a conducting wire. What is the ratio of (i) charges on the spheres and (ii)
         electric fields at the surface of the two spheres.

     30. Derive lens maker's formula for a double convex lens. State the assumptions made and
         sign convention used.
         A needle placed 45 cm. from the lens forms an image on a screen placed 90 cm on the
         other side of the lens. Identify the type of the lens and determine its focal length. What
         is the size of the image if the size of the needle is 5.0 cm.

                                                     Or

         An angular magnification (magnifying power) of 30 is desired using an objective of focal
         length 1.25 cm and on eye-piece of focal length 5 cm. How will you set up the
         compound microscope? Show a labeled ray diagram showing the formation of image in

          a compound microscope. Write the expression for its magnifying power.




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