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JEE Main Test 123
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JEE Main Test 123
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  • Question 1/10
    4 / -1

    Light of wavelength 6000 Å falls on a single slit of width 0.1 mm. The second minimum will be formed for the angle of diffraction of

    Solutions

     

  • Question 2/10
    4 / -1

    On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If μ =1.5, the thickness of the film is (wavelength of monochromatic light is λ)

    Solutions

     

  • Question 3/10
    4 / -1

    A parabola is drawn with its focus at (3, 4) and vertex at the focus of the parabola y2 - 12x - 4y + 4 = 0. The equation of the parabola is

  • Question 4/10
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  • Question 5/10
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    Directions For Questions

    For an ideal gas, consider only p-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure.

    ...view full instructions

    Which of the following choice (s) is (are) correct ?

    Solutions

    Since entropy is a property, the change in entropy of the system over one complete cycle is zero. Because when a system is carried through a cyclic process leaves yhe system in the same state in which it started.

     

  • Question 6/10
    4 / -1

    The thermal dissociation of equilibrium of CaCO3 (S) is studied under different conditions.

    CaCO3 (s) ⇌ CaO (s) + CO2 (g)

    For this equilibrium, the correct statement (s) is (are)

    Solutions

    Calcium carbonate releases carbon dioxide on heating called a thermal decomposition reaction or calcination(to above 840oC) to form calcium  oxide, commonly called quick lime, with reaction enthalpy 178KJ mol–1.

     

  • Question 7/10
    4 / -1

    The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is

    (Atomic mass of Al = 27)

    Solutions

    Bauxite is not directly used in Hall’s process. It is first converted into alumina by bayer’s process. Reaction of carbon with Al2O3 forming Aluminium and carbon dioxide is given.

     

  • Question 8/10
    4 / -1

    The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

    Solutions

     

  • Question 9/10
    4 / -1

    The epoxide ring consists of which of the following?

    Solutions

    Epoxide consists of three membered ring with two carbon and one oxygen.

     

  • Question 10/10
    4 / -1

    Silver (atomic weight = 108 g mol-1 ) has a density of 10.5 g cm-3. The number of silver atoms on a surface of area 10-12 m2 can be expressed in scientific notation as y × 10x . The value of x is

    Solutions

     

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