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Day 387: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Wave Optics. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    115
    Two light waves of wavelengths 800 and 600 nm600\text{ }nm are used in Young's double slit experiment to obtain interference fringes on a screen placed 7 m7\text{ }m away from plane of slits. If the two slits are separated by 0.35 mm0.35\text{ }mm, then shortest distance from the central bright maximum to the point where the bright fringes of the two wavelength coincide will be ____\_\_\_\_ mm.

  2. Question 2

    Ray Optics. Asked once: 29 Jan 2024 (same type asked 5 times) See all 5 of this type

    98
    If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm15\text{ }cm, the focal length of the mirror must be:

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  3. Question 3

    Magnetism and Matter. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    18
    A bar magnet with a magnetic moment 5.0Am25.0Am^{2} is placed in parallel position relative to a magnetic field of 0.4 T0.4\text{ }T. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is___

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  4. Question 4

    Thermal Properties of Matter. Asked once: 2021 Paper 13 (same type asked 5 times) See all 5 of this type

    16
    A section of a railway track is clamped between two nails. In summers it gets heated up and as a result, some elastic energy is stored in it. If ΔT=10∘C,α=10−6 ∘C−1=\Delta T=10^{\circ}C, \alpha = 10^{-6}\ ^{\circ}C^{- 1} = coefficient of linear expansion, Y=1011Nm−2=Y=10^{11}Nm^{- 2}= Young's modulus, A=0.01 m2=A= 0.01{\text{ }m}^{2}= Area of cross section. Find the energy stored per unit length in the railway track.

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  5. Question 5

    Units and Measurements. Asked once: 2021 Paper 17 (same type asked 5 times) See all 5 of this type

    6
    Match List I with List II.
    List-IList-II
    (a) Capacitance, CC(i) M1 L1 T−3 A−1M^{1}{\text{ }L}^{1}{\text{ }T}^{- 3}{\text{ }A}^{- 1}
    (b) Permittivity of free space, ε0\varepsilon_{0}(ii) M−1 L−3 T4 A2M^{- 1}{\text{ }L}^{- 3}{\text{ }T}^{4}{\text{ }A}^{2}
    (c) Permeability of free space, μ0\mu_{0}(iii) M−1L−2T4A2M^{- 1}L^{- 2}T^{4}A^{2}
    (d) Electric field, EE(iv) M1 L1 T−2 A−2M^{1}{\text{ }L}^{1}{\text{ }T}^{- 2}{\text{ }A}^{- 2}
    Choose the correct answer from the options given below:

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