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Day 414: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 2021 Paper 23 (same type asked 8 times) See all 8 of this type

    26
    The diameter of a spherical bob is measured using a vernier callipers. 9 divisions of the main scale, in the vernier callipers, are equal to 10 divisions of vernier scale. One main scale division is 1 mm1\text{ }mm. The main scale reading is 10 mm10\text{ }mm and 8th 8^{\text{th~}} division of vernier scale was found to coincide exactly with one of the main scale division. If the given vernier callipers has positive zero error of 0.04 cm0.04\text{ }cm, then the radius of the bob is ____×10−2 cm\_\_\_\_\times10^{- 2}\text{ }cm.

  2. Question 2

    Gravitation. Asked once: 25 Jun 2022 (same type asked 8 times) See all 8 of this type

    5
    The height of any point PP above the surface of earth is equal to diameter of earth. The value of acceleration due to gravity at point PP will be: (Given g=g = acceleration due to gravity at the surface of earth)

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  3. Question 3

    Units and Measurements. Asked once: 2021 Paper 18 (same type asked 8 times) See all 8 of this type

    15
    In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the circular scale, and the main scale moves by 0.5 mm0.5\text{ }mm on a complete rotation. For a particular observation the reading on the main scale is 5 mm5\text{ }mm and the 20th 20^{\text{th~}} division of the circular scale coincides with reference line. Calculate the true reading.

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  4. Question 4

    Moving Charges and Magnetism. Asked once: 1 Feb 2023 (same type asked 8 times) See all 8 of this type

    107
    As shown in the figure, a long straight conductor with semicircular arc of radius π10 m\frac{\pi}{10}\text{ }m is carrying current I =3 A= 3\text{ }A. The magnitude of the magnetic field. at the center 0 of the arc is: (The permeability of the vacuum =4π×10−7NA−2= 4\pi \times10^{- 7}NA^{- 2} )

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  5. Question 5

    Gravitation. Asked once: 1 Feb 2023 (same type asked 8 times) See all 8 of this type

    4
    If earth has a mass nine times and radius twice to that of a planet P. Then ve3x ms−1\frac{v_{e}}{3}\sqrt{x}{\text{ }ms}^{- 1} will be the minimum velocity required by a rocket to pull out of gravitational force of PP, where vev_{e} is escape velocity on earth. The value of xx is

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