JEE Mains 2024 31 Jan Evening Shift physics questions with solutions

Showing 1–10 of 29 questions

• NumericmediumProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  Two blocks of mass 2 kg and 4 kg are connected by a metal wire going over a smooth pulley as shown in figure. The radius of wire is 4.0 × 10⁻⁵ m and Young's modulus of the metal is 2.0 × 10¹¹ N/m². The longitudinal strain developed in the wire is 1/(απ). The value of α is____. [Use g = 10 m/s²]

  

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• MCQmediumUnit dimension and errorDimension and its application

  Consider two physical quantities A and B related to each other as E = (B - x²)/(At), where E, x and t have dimensions of energy, length and time respectively. The dimension of AB is

  Options

  • Option A

    L²M¹T⁰

  • Option B

    L²M⁻¹T¹

  • Option C

    L²M⁻¹T⁻¹

  • Option D

    L⁰M⁻¹T¹

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• NumericmediumMagnetic effect of currentbiot savart law and magnetic field due to straight conductor ,arc and ring

  Two circular coils P and Q of 100 turns each have same radius of π cm. The currents in P and R are 1 A and 2 A respectively. P and Q are placed with their planes mutually perpendicular with their centers coincide. The resultant magnetic field induction at the center of the coils is √x mT, where x =_________. [Use μ₀ = 4π × 10⁻⁷ T m A⁻¹]

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• NumericeasyElectromagnetic Inductionfaradays law and question based on it

  The magnetic flux ϕ (in weber) linked with a closed circuit of resistance 8 Ω varies with time (in seconds) as ϕ = 5t² - 36t + 1. The induced current in the circuit at t = 2s is _______ A.

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• MCQmediumUnit dimension and errorError and its addition ,subtraction,multipication and division

  The measured value of the length of a simple pendulum is 20 cm with 2 mm accuracy. The time for 50 oscillations was measured to be 40 seconds with 1 second resolution. From these measurements, the accuracy in the measurement of acceleration due to gravity is N%. The value of N is:

  Options

  • Option A

    4

  • Option B

    8

  • Option C

    6

  • Option D

    5

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• NumericmediumRotational Motionangular momentum in pure rotation and its conservation

  A body of mass 'm' is projected with a speed ‘u’ making an angle of 45° with the ground. The angular momentum of the body about the point of projection, at the highest point is expressed as √2 $\mu$³/(Xg). The value of 'X' is_______.

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• MCQeasyCurrent electricitycombination of cells and maximum power theorem

  By what percentage will the illumination of the lamp decrease if the current drops by 20%?

  Options

  • Option A

    46%

  • Option B

    26%

  • Option C

    36%

  • Option D

    56%

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• MCQmediumWork , Power and EnergyPower

  A body of mass 2 kg begins to move under the action of a time dependent force given by $\overrightarrow{F}$ = (6tî + 6t²ĵ) N. The power developed by the force at the time t is given by:

  Options

  • Option A

    (6t⁴ + 9t⁵) W

  • Option B

    (3t³ + 6t⁵) W

  • Option C

    (9t⁵ + 6t³) W

  • Option D

    (9t³ + 6t⁵) W

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• NumericmediumSimple Harmonic Motiontime period of linear shm

  The time period of simple harmonic motion of mass M in the given figure is π√(αM/5K), where the value of α is _______.

  

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• MCQeasyElectrostaticselectric charge and coulamb's law

  Force between two point charges q₁ and q₂ placed in vacuum at ‘r’ cm apart is F. Force between them when placed in a medium having dielectric K = 5 at ‘r/5’ cm apart will be:

  Options

  • Option A

    F/25

  • Option B

    5F

  • Option C

    F/5

  • Option D

    25F

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