JEE Mains 2024 30 Jan Evening Shift physics questions with solutions

Showing 1–10 of 30 questions

• NumericmediumWave Motionbeat and properties of sound like loudness,pitch

  A point source is emitting sound waves of intensity 16 × 10⁻⁸ Wm⁻² at the origin. The difference in intensity (magnitude only) at two points located at a distances of 2m and 4m from the origin respectively will be _______ × 10⁻⁸ Wm⁻².

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• MCQeasyMagnetic effect of currentmagnetic moment and torque on current carring loop in magnetic field

  An electron revolving in nth Bohr orbit has magnetic moment μₙ. If μₙ ∝ nˣ, the value of x is:

  Options

  • Option A

    2

  • Option B

    1

  • Option C

    3

  • Option D

    0

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• MCQmediumsemiconductorapplication of diode and zener breakdown

  In the given circuit, the voltage across load resistance (Rₗ) is:

  

  Options

  • Option A

    8.75 V

  • Option B

    9.00 V

  • Option C

    8.50 V

  • Option D

    14.00 V

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• MCQmediumAC Circuitsseries combination of ac circuit and L-C-R circuit

  An alternating voltage V(t) = 220 sin 100πt volt is applied to a purely resistive load of 50 Ω. The time taken for the current to rise from half of the peak value to the peak value is:

  Options

  • Option A

    5 ms

  • Option B

    3.3 ms

  • Option C

    7.2 ms

  • Option D

    2.2 ms

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• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  For the photoelectric effect, the maximum kinetic energy (Eₖ) of the photoelectrons is plotted against the frequency (ν) of the incident photons as shown in figure. The slope of the graph gives

  

  Options

  • Option A

    Ratio of Planck’s constant to electric charge

  • Option B

    Work function of the metal

  • Option C

    Charge of electron

  • Option D

    Planck’s constant

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• NumericmediumElectrostaticelectric charge and coulamb's law

  Two identical charged spheres are suspended by string of equal lengths. The string make an angle of 37° with each other. When suspended in a liquid of density 0.7 g/cm³, the angle remains same. If density of material of the sphere is 1.4 g/cm³, the dielectric constant of the liquid is _________ (tan37° = $\frac{3}{4}$).

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

  The current of 5A flows in a square loop of sides 1 m is placed in air. The magnetic field at the centre of the loop is X√2 × 10⁻⁷ T. The value of X is_____.

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• NumericeasyMathematical tools and vectorVectors

  A vector has magnitude same as that of $\vec{A}$= 3î + 4ĵ and is parallel to $\vec{B}$ = 4î + 3ĵ. The x and y components of this vector in first quadrant are x and 3 respectively where x = _______.

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• NumericmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  Two resistance of 100 Ω and 200 Ω are connected in series with a battery of 4 V and negligible internal resistance. A voltmeter is used to measure voltage across 100 Ω resistance, which gives reading as 1 V. The resistance of voltmeter must be______Ω.

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• MCQmediumNewtons law of motion and Frictionfriction and single block problem

  A block of mass m is placed on a surface having vertical cross section given by y = x²/4. If coefficient of friction is 0.5, the maximum height above the ground at which block can be placed without slipping is:

  Options

  • Option A

    1/4 m

  • Option B

    1/2 m

  • Option C

    1/6 m

  • Option D

    1/3 m

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