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  Question 1

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

A : X-ray region
B : Ultraviolet region
C : Visible region
D : Infrared region


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     Correct answer is : B



  •   Question 2

    A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 106 ms-1. The velocity of the particle is (mass of electron = 9.1 * 10-31 kg)

    A : 2.7 * 10-21 ms-1
    B : 2.7 * 10-18 ms-1
    C : 9 * 10-2 ms-1
    D : 3 * 10-31 ms-1


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     Correct answer is : B

     Solution :
      same momentum of both the particles

  •   Question 3

    The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is

    A : 0
    B : 3.4eV
    C : 6.8eV
    D : 10.2eV


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     Correct answer is : D

     Solution :
      Excitation energy = Ef - Ei = -3.4 - (-13.6) = 10.2 eV

  •   Question 4





    A : B :
    C : D :


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     Correct answer is : D



  •   Question 5

    Two nuclei have their mass numbers in the ratio of 1:3. The ratio of their nuclear densities would be

    A : 1 : 1
    B : 1 : 3
    C : 3 : 1
    D : (3)^1/3 : 1


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     Correct answer is : A

     Solution :
      Density is independent of mass number of nuclei.

  •   Question 6





    A : B :
    C : D :


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     Correct answer is : B



  •   Question 7

    The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

    A : 100
    B : 90
    C : 10
    D : 1.25


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     Correct answer is : A



  •   Question 8

    If the lattice parameter for a crystalline structure is 3.6 A , then the atomic radius in fcc crystal is

    A : 1.27A
    B : 1.81A
    C : 2.10A
    D : 2.92A


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     Correct answer is : A



  •   Question 9





    A : OR GATE
    B : AND GATE
    C : NAND GATE
    D : NOR GATE


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     Correct answer is : D

     Solution :
      simplifies to NOR GATE

  •   Question 10

    A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

    A : 20 * 1014 Hz
    B : 10 * 1014 Hz
    C : 5 * 1014 Hz
    D : 1 * 1014 Hz


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     Correct answer is : C

     Solution :
      v=E/H = 5 * 10 14 Hz

  •   Question 11

    If uncertainty in position and momentum are equal, then uncertainty in velocity is

    A : B :
    C : D :


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     Correct answer is : B



  •   Question 12

    If a gas expands at constant temperature, it indicates that

    A : Number of the molecules of gas increases
    B : Kinetic energy of molecules decreases
    C : Pressure of the gas increases
    D : Kinetic energy of molecules remains the same


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     Correct answer is : D

     Solution :
      Kinetic energy of gaseous molecules depends on temperature only

  •   Question 13

    The value of equilibrium constant of the reaction



    A : 1/8
    B : 1/16
    C : 1/64
    D : 16


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     Correct answer is : C



  •   Question 14

    If 'a' stands for the edge length of the cubic systems : simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

    A : B :
    C : D :


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     Correct answer is : B



  •   Question 15

    Kohlrausch's law states that at

    A : Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte
    B : Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte
    C : Infinite dilution each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte
    D : Infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte


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     Correct answer is : A

     Solution :
      Kohlrausch's law states, ''at infinite dilution each ion contributes its fixed value towards equivalent conductance irrespective of the other ion in combination with it at fixed temperature.''

  •   Question 16

    The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 * 10-18 g cm s-1. The uncertainty in electron velocity is, (mass of an electron is 9 10^-28 g)

    A : 1 * 1011 cm s-1
    B : 1 * 109 cm s-1
    C : 1 * 106 cm s-1
    D : 1 * 105 cm s-1


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     Correct answer is : B



  •   Question 17

    Which of the following are not state functions?
    (I) q + w
    (II) q
    (III) w
    (IV) H-TS


    A : (II) and (III)
    B : (I) and (IV)
    C : (II), (III) and (IV)
    D : (I), (II) and (III)


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     Correct answer is : A



  •   Question 18





    A : B :
    C : D :


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     Correct answer is : B



  •   Question 19

    What volume of oxygen gas (O2) measured at 0 deg C and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions?

    A : 10L
    B : 7L
    C : 6L
    D : 5L


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     Correct answer is : D



  •   Question 20

    Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJmol- 1respectively. Enthalpy of formation of HCl is

    A : 245 kJmol-1
    B : 93 kJmol-1
    C : -245 kJmol-1
    D : -93 kJmol-1


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     Correct answer is : D



  •   Question 21

    Which of the following statements is not correct?

    A : The number of Bravais lattices in which a crystal can be categorized is 14
    B : The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
    C : Molecular solids are generally volatile
    D : The number of carbon atoms in an unit cell of diamond is 4


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     Correct answer is : D

     Solution :
      Diamond has ZnS type structure. So, no. of atoms in a unit cell of diamond is 8. Note : But option (2) is also incorrect because the fraction of the total volume occupied by the atoms in a cubic primitive cells is 0.524

  •   Question 22

    Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?

    A : 1.11 * 10-3 M
    B : 1.11 * 10-4 M
    C : 3.7 * 10-4 M
    D : 3.7 * 10-3 M


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     Correct answer is : C



  •   Question 23





    A : 1 : 1
    B : 3 : 1
    C : 1 : 9
    D : 36 : 1


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     Correct answer is : D



  •   Question 24





    A : 4 times
    B : 8 times
    C : 16 times
    D : 64 times


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     Correct answer is : D

     Solution :
      To maintain the constant value of Kc, the concentration of Fe3+ ion will increase by 64 times.

  •   Question 25





    A : B :
    C : D :


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     Correct answer is : C



  •   Question 26





    A : B :
    C : D :


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     Correct answer is : A



  •   Question 27





    A : 0.0968 V
    B : 1.968 V
    C : 2.0968 V
    D : 1.0968 V


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     Correct answer is : D



  •   Question 28







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     Correct answer is :



  •   Question 29

    The sequence of ionic mobility in aqueous solution is

    A : Na+ > K+ > Rb+ > Cs+
    B : K+ > Na+ > Rb+ > Cs+
    C : Cs+ > Rb+ > K+ > Na+
    D : Rb+ > K+ > Cs+ > Na+


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     Correct answer is : C

     Solution :
      More the charge density of ion, more will be the ion-dipole interaction, so more will be hydration of ion and hence less will be the ionic mobility.

  •   Question 30

    Percentage of free space in a body centred cubic unit cell is

    A : 28%
    B : 30%
    C : 32%
    D : 34%


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     Correct answer is : C


  •   Question 31

    The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is

    A : Ti > V > Cr > Mn
    B : Cr > Mn > V > Ti
    C : V > Mn > Cr > Ti
    D : Mn > Cr > Ti > V


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     Correct answer is : B

     Solution :
      After removing one electron from chromium, the resulting structure becomes more stable. Hence Cr has higher second ionisation enthalpy. Thus, the correct order is Cr > Mn > V > Ti

  •   Question 32

    How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

    A : 0.029
    B : 0.044
    C : 0.333
    D : 0.011


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     Correct answer is : A



  •   Question 33

    Which of the following complexes exhibits the highest paramagnetic behaviour?
    Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities). (At. number Ti = 22, V = 23, Fe = 26, Co = 27)


    A : B :
    C : D :


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     Correct answer is : D



  •   Question 34

    Volume occupied by one molecule of water (density = 1 g cm-3) is

    A : 5.5 * 10-23 cm3
    B : 9.0 * 10-23 cm3
    C : 6.023 * 10-23 cm3
    D : 3.0 * 10-23 cm3


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     Correct answer is : D



  •   Question 35