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Day 77: JEE Mains Physics

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

  1. Question 1

    Alternating Current. This type asked 3 times: 25 Jul 2022, 25 Jan 2023, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    13
    In series LCR circuit, the capacitance is changed from CC to 4C. To keep the resonance frequency unchanged, the new inductance should be:

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  2. Question 2

    Laws of Motion. This type asked 3 times: 28 Jun 2022, 29 Jun 2022, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    18
    Consider a block and trolley system as shown in figure. If the coefficient of kinetic friction between the trolley and the surface is 0.04, the acceleration of the system in ms−2ms^{- 2} is: (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless):

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  3. Question 3

    Mechanical Properties of Fluids. This type asked 3 times: 29 Jan 2023, 29 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    28
    A plane is in level flight at constant speed and each of its two wings has an area of 40 m240{\text{ }m}^{2}. If the speed of the air is 180 km/h180\text{ }km/h over the lower wing surface and 252 km/h252\text{ }km/h over the upper wing surface, the mass of the plane is ______ kg. (Take air density to be 1 kg m−31\text{ }kg{\text{ }m}^{- 3} and g=10 ms−2g = 10{\text{ }ms}^{- 2} )

  4. Question 4

    Motion in a Plane. This type asked 3 times: 14 Jun 2022, 31 Jan 2023, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    7
    A ball of mass 0.5 kg0.5\text{ }kg is attached to a string of length 50 cm50\text{ }cm. The ball is rotated on a horizontal circular path about its vertical axis. The maximum tension that the string can bear is 400 N400\text{ }N. The maximum possible value of angular velocity of the ball in rad/srad/s is:

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  5. Question 5

    Moving Charges and Magnetism. This type asked 3 times: 25 Jan 2023, 27 Jan 2024, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    113
    A moving coil galvanometer has 100 turns and each turn has an area of 2.0 cm22.0{\text{ }cm}^{2}. The magnetic field produced by the magnet is 0.01 T0.01\text{ }T and the deflection in the coil is 0.05 radian when a current of 10 mA10\text{ }mA is passed through it. The torsional constant of the suspension wire is x×10−5 N−m/radx \times10^{- 5}\text{ }N - m/rad. The value of xx is _____ .