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Day 273: JEE Mains Physics

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

  1. Question 1

    Kinetic Theory. Asked once: 29 Jan 2023 (same type asked 5 times) See all 5 of this type

    7
    A bicycle tyre is filled with air having pressure of 270kPa270kPa at 27∘C27^{\circ}C. The approximate pressure of the air in the tyre when the temperature increases to 36∘C36^{\circ}C is

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  2. Question 2

    Magnetism and Matter. Asked once: 6 Apr 2024 (same type asked 5 times) See all 5 of this type

    28
    A circular coil having 200 turns, 2.5×10−4 m22.5 \times10^{- 4}{\text{ }m}^{2} area and carrying 100μA100\mu A current is placed in a uniform magnetic field of 1 T1\text{ }T. Initially the magnetic dipole moment (M→)(\overrightarrow{M}) was directed along B→\overrightarrow{B}. Amount of work, required to rotate the coil through 90∘90^{\circ} from its initial orientation such that M→\overrightarrow{M} becomes perpendicular to B→\overrightarrow{B}, is ___________ μJ\mu J.

  3. Question 3

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

    30
    A thin rod having a length of 1 m1\text{ }m and area of cross-section 3×10−6 m23 \times10^{- 6}{\text{ }m}^{2} is suspended vertically from one end. The rod is cooled from 210∘C210^{\circ}C to 160∘C160^{\circ}C. After cooling, a mass MM is attached at the lower end of the rod such that the length of rod again becomes 1 m1\text{ }m. Young's modulus and coefficient of linear expansion of the rod are 2×1011 N m−22 \times10^{11}\text{ }N{\text{ }m}^{- 2} and 2×10−5 K−12 \times10^{- 5}{\text{ }K}^{- 1}, respectively. The value of MM is__ kgkg. (Take g=10 m s−2g = 10\text{ }m{\text{ }s}^{- 2} )

  4. Question 4

    Units and Measurements. Asked once: 6 Apr 2024 (same type asked 5 times) See all 5 of this type

    11
    Match List I with List II.
    List IList II
    A. TorqueI. [M1L1T−2A−2]\left\lbrack M^{1}L^{1}T^{-2}A^{-2} \right\rbrack
    B. Magnetic fieldII. [L2A1]\left\lbrack L^{2}A^{1} \right\rbrack
    C. Magnetic momentIII. [M1T−2A−1]\left\lbrack M^{1}T^{-2}A^{-1} \right\rbrack
    D. Permeability of free spaceIV. [M1L2T−2]\left\lbrack M^{1}L^{2}T^{-2} \right\rbrack
    Choose the correct answer from the options given below:

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  5. Question 5

    Electromagnetic Waves. Asked once: 6 Apr 2024 (same type asked 5 times) See all 5 of this type

    5
    Electromagnetic waves travel in a medium with speed of 1.5×108 ms−11.5 \times10^{8}{\text{ }ms}^{- 1}. The relative permeability of the medium is 2.0. The relative permittivity will be:

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