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    10 PAPER NO-10 - (Ch-17-21) Final by Riaz SB

    Uploaded by

    Shoaib Hassan

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    10 PAPER NO-10 - (Ch-17-21) Final by Riaz SB

    Uploaded by

    Shoaib Hassan
    3 views3 pages

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    10 PAPER NO-10- (Ch-17-21) Final By Riaz sb

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    3 views3 pages

    10 PAPER NO-10 - (Ch-17-21) Final by Riaz SB

    Uploaded by

    Shoaib Hassan

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    ECAT FINAL STRIKE

    PAPER NO-10
    PLEASE DO NOT WRITE ANYTHING ON THIS PAGE.
    ALL ANSWERS MUST BE GIVEN ON THE ANSWER SHEET.
    Time allowed: 80min
    No. of questions: 100 Sumair Sb
    PART–I (PHYSICS) Ph# 0333-4351892

    (1) Relativistic mechanics which deals with the situations involving uniform motion of
    frame of reference is called
    (a) Special theory of relativity (b) Classical theory
    (b) General theory of relativity (d) None of these
    (2) Photons are produced in electron positron annihilation each having energy
    (a) 5.01MeV (b) 1.5 MeV
    (c) 0.51 MeV (d) 0.01 MeV
    (3) In the following diagram which part of curve represents the same characteristics as
    OA shows:

    (a) curve ‘ab’ (b) Curve ‘cd’


    (c) Curve ‘de’ (d) Curve ‘ev’
    (4) In the half life of a radioactive substance the decayed atoms are
    1 1
    (a) of the original (b) of the original
    2 4
    1 1
    (c) of the original (d) of the original
    8 16
    (5) Mathematical notation for the following diagram is

     
    (a)  A.B  . A.B  
    (b)  A  B  . A.B

     
    (c)  A.B  . A.B  
    (d)  A.B  . A.B
    (6) According to Bohr’s atomic model, an electron in hydrogen atom revolves around
    the nucleus in
    (a) A circle of an allowed radius (b) An elliptic orbit
    (c) Spiral path narrowing down to nucleus (d) A circle of any radius
    (7) If the number of electrons hitting the target in the X-ray tube increases then the
    intensity of X-rays
    (a) Decrease (b) Increases
    (c) Remains constant (d) None of the above

    ECAT FINAL STRIKE FLP-10 Page 1 of 3


    (8) An atom of an element differs from an atom of one of its isotopes in number of
    (a) Neutrons in the nucleus (b) Protons in the nucleus
    (c) Electrons outside the nucleus (d) Valence electrons
    (9) Nuclear reaction can be induced in 92U238 with bombardment of
    (a) Slow neutrons (b) Fast neutrons
    (c) Photon (d) Graviton
    (10) Production of X-rays is an inverse process of
    (a) Compton effect (b) Photoelectric effect
    (c) Fission (d) Pair production
    (11) The atom or molecules in a crystalline solids are held together by
    (a) Cohesive force (b) Nuclear force
    (c) Gravitational force (d) Electric force
    (12) An element is naturally radioactive its charge number is greater than
    (a) 70 (b) 79
    (c) 80 (d) 82
    77
    (13) The symbol 32 Ge represents a nucleus of germanium that decays to a nucleus of
    arsenic by emitting a -particle.
    76 78
    (a) 32 As (b) 32 As
    78 77
    (c) 31 As (d) 33 As
    (14) In a reverse biased the width of potential barrier
    (a) Increased (b) Decreased
    (c) Remains same (d) May increase or decrease
    (17) X-rays have same ______ but more _______ than -rays
    (a) penetrating power, speed (b) speed, frequency
    (c) speed, wavelength (d) speed, penetrating power
    (18) The radius of second orbit of hydrogen atom is
    (a) 0.53Ao (b) 2.12Ao
    (c) 3.53Ao (d) 4.12Ao
    (15) Which of the following curve shows maximum energy loss and minimum energy loss
    respectively?

    (a) 2 and 1 (b) 1 and 4


    (c) 4 and 1 (d) 1 and 2
    (19) Depletion region has
    (a) Electrons only (b) Holes only
    (c) Both electron and holes (d) Neither electron and holes
    (20) The half life of radio active substance depends upon
    (a) Amount of substance (b) Energy of substance
    (c) Nature of substance (d) Temperature of substance
    (21) Which of the following element is the mains source of -radiation
    (a) Co-60 (b) Sr-94
    (c) Rn-222 (d) U-238
    (22) Input resistance of an operational amplifier is the resistance between
    (a) Negative input and output (b) Positive and negative input
    (c) Positive input and output (d) Output and earth
    (23) The radiation emitted from a hydrogen filled discharge tube is dispersed by a prism.
    The spectrum observed is called
    (a) Continuous (b) Band

    ECAT FINAL STRIKE FLP-10 Page 2 of 3


    (c) Line (d) Absorption
    (24) Which of the following process is most necessary for the laser action
    (a) Population inversion (b) Induced absorption
    (c) Induce emission (d) All of these
    (25) Which one of the following is polymer
    (a) Nylon (b) Polythene
    (c) Polystyrene (d) All of these
    (26) Which is diamagnetic
    (a) Copper (b) Bismuth
    (c) Water (d) All of these
    (27) For which of the following conditions elements become unstable when.
    (a) Weak nuclear force becomes zero
    (b) Weak nuclear force dominates strong nuclear force
    (c) Strong nuclear force dominates weak nuclear force
    (d) Strong nuclear force becomes zero
    (16) The diagram shows the first five energy levels of an atom.

    Photons of electromagnetic radiation are emitted when an electron falls from


    one energy level to a lower level.
    Which transition corresponds to a photon with the greatest wavelength?
    (a) E2 to E1 (b) E5 to E1
    (c) E4 to E3 (d) E5 to E4
    (28) Inverted mode of P.N.P transistor is when _____ and _____ are reverse biased
    (a) collector and emitter (b) Base and emitter
    (c) Base and collector (d) Not possible
    (29) Concept of matter waves was proposed by
    (a) Newton (b) Davisson
    (c) Germer (d) de-Broglie
    (30) The de-Broglie wavelength of particle of mass and energy E is
    (a) λ = h/mc (b) λ = 2e/h
    2mE h
    (c) λ = (d) λ =
    h 2mE

    ECAT FINAL STRIKE FLP-10 Page 3 of 3

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