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Day 137: JEE Mains Physics

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

  1. Question 1

    Alternating Current. This type asked 2 times: 2021 Paper 23, 26 Jul 2022. This one: 26 Jul 2022 See all 2 of this type

    27
    The effective current I in the given circuit at very high frequencies will be A

  2. Question 2

    Mechanical Properties of Solids. This type asked 2 times: 2021 Paper 22, 26 Jul 2022. This one: 26 Jul 2022 See all 2 of this type

    115
    A uniform heavy rod of mass 20 kg20\text{ }kg, cross-sectional area 0.4 m20.4{\text{ }m}^{2} and length 20 m20\text{ }m is hanging from a fixed support. Neglecting the lateral contraction, the elongation in the rod due to its own weight is x×10−9 mx \times10^{- 9}\text{ }m. The value of xx is :(Given. Young's modulus Y=2×1011Nm−2Y = 2 \times10^{11}Nm^{- 2} and  g=10 ms−2)\left. \ g = 10{\text{ }ms}^{- 2} \right)

  3. Question 3

    Motion in a Plane. This type asked 2 times: 2021 Paper 13, 26 Jul 2022. This one: 26 Jul 2022 See all 2 of this type

    111
    If A→=(2i^+3j^−k^)m\overrightarrow{A}= (2\widehat{i}+ 3\widehat{j}-\widehat{k})m and B→=(i^+2j^+2k^)m\overrightarrow{B}= (\widehat{i}+ 2\widehat{j}+ 2\widehat{k})m. The magnitude of component of vector A→\overrightarrow{A} along vector B→\overrightarrow{B} will be ____\_\_\_\_ m.

  4. Question 4

    Nuclei. This type asked 2 times: 2021 Paper 26, 26 Jul 2022. This one: 26 Jul 2022 See all 2 of this type

    3
    The disintegration rate of a certain radioactive sample at any instant is 4250 disintegrations per minute. 10 minutes later, the rate becomes 2250 disintegrations per minute. The approximate decay constant is: (Take log⁡101.88=0.274\log_{10}1.88 = 0.274)

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  5. Question 5

    Oscillations. This type asked 2 times: 2021 Paper 8, 26 Jul 2022. This one: 26 Jul 2022 See all 2 of this type

    17
    As per the given figure, two blocks each of mass 250 g250\text{ }g are connected to a spring of spring constant 2Nm−12Nm^{- 1}. If both are given velocity vv in opposite directions, then maximum elongation of the spring is:

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