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    Subject
    Physics

    Class

    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2011

    Multiple Choice QuestionsShort Answer Type

    41. Starting with the law of radioactive disintegration, show that : N = N0e-λ t, where the terms have their usual meaning.
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    42. What is meant by Pair Production ? Explain with the help of an example and a balanced equation.
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    43.

    An X ray tube is operated at a tube potential of 40,000 V. Calculate :

    (i) Kinetic energy of an electron emitted by the filament when it reaches the target / anode.

    (ii) Wavelengths of all the X rays emitted by the X ray tube. 

    (i) Given    V = 40,000V.

    We know    KE = eV

    = 1.6 x 10-19x 40,000

    = 6.4 x lO-15 J.

    ii) We know,

    straight lambda subscript min space equals space fraction numerator 6.6 space straight x space 10 to the power of negative 34 end exponent space straight x space 3 space straight x space 10 to the power of 8 over denominator 1.6 space straight x space 10 to the power of negative 19 end exponent space straight x space 40 comma 000 end fraction space space space space space space space equals space fraction numerator 1.98 space straight x space 10 to the power of negative 25 end exponent over denominator 1.6 space straight x space 10 to the power of negative 19 end exponent space straight x space 40 comma 000 end fraction space space space space space space space equals space 0.309375 space straight x space 10 to the power of negative 11 end exponent space space space space space space space space equals space 0.309375 space straight A Range space rightwards arrow space 0.309375 space straight A space to space infinity. space

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    44. (i)In the following nuclear reaction, calculate the energy released in MeV :

    straight H presubscript 1 presuperscript 2 space plus space straight H presubscript 1 presuperscript 2 space rightwards arrow space He presubscript 2 presuperscript 3 space plus space straight n presubscript 0 presuperscript 1
    Given that: Mass of straight H presubscript 1 presuperscript 2 = 2.015 u
    Mass of He presubscript 2 presuperscript 3 space equals space 3.017 space straight u
    Mass of on = 1.009u

    (ii) What is the name of this reaction ?
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    45.

    What is meant by the terms :

    (i) a full wave rectifier ?

    (ii) an amplifier ?

    (iii) an oscillator ?  

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    46. Using several NAND gates, how can you obtain an AND gate ? Draw a labelled diagram in support of your answer.
    539 Views
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    Multiple Choice QuestionsLong Answer Type

    47. Obtain an expresssion for intensity of electric field in end on position. i.e., axial position of an electric dipole.  
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