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Day 244: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Solids. Asked once: 26 Jun 2022 (same type asked 2 times) See all 2 of this type

    24
    The elongation of a wire on the surface of the earth is 10−4 m10^{- 4}\text{ }m. The same wire of same dimensions is elongated by 6×10−5 m6 \times10^{- 5}\text{ }m on another planet. The acceleration due to gravity on the planet will be ____ ms−2\_\_\_\_\ ms^{- 2}. (Take acceleration due to gravity on the surface of earth =10 m/s2= 10\text{ }m/s^{2} )

  2. Question 2

    Moving Charges and Magnetism. Asked once: 28 Jun 2022 (same type asked 2 times) See all 2 of this type

    29
    A singly ionized magnesium ion (mass number 24) is accelerated to kinetic energy 5keV5keV and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T0.5\text{ }T. The radius of path formed will be ____\_\_\_\_ cm.

  3. Question 3

    Waves. Asked once: 2021 Paper 25 (same type asked 2 times) See all 2 of this type

    21
    The mass per unit length of a uniform wire is 0.135 g/cm0.135\text{ }g/cm. A transverse wave of the form y=−0.21sin⁡(x+30t)y= - 0.21\sin(x+ 30t) is produced in it, where xx is in meter and tt is in second. Then, the expected value of tension in the wire is x×10−2 Nx\times10^{- 2}\text{ }N. Value of xx is ___ . (Round-off to the nearest integer)

  4. Question 4

    Nuclei. Asked once: 2021 Paper 10 (same type asked 2 times) See all 2 of this type

    11
    The decay of a proton to neutron is:

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  5. Question 5

    Atoms. Asked once: 25 Jun 2022 (same type asked 2 times) See all 2 of this type

    16
    The ratio for the speed of the electron in the 3rd 3^{\text{rd~}} orbit of He+He^{+}to the speed of the electron in the 3rd 3^{\text{rd~}} orbit of hydrogen atom will be :-

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