JEE Mains 2024 29 Jan Evening Shift physics questions with solutions

Showing 1–10 of 30 questions

• MCQmediumGeometrical opticsSpherical Mirrors & Image Formation

  If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :

  Options

  • Option A

    15 cm

  • Option B

    –12 cm

  • Option C

    –10 cm

  • Option D

    10/3 cm

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• NumericmediumAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  Hydrogen atom is bombarded with electrons accelerated through a potential different of V, which causes excitation of hydrogen atoms. If the experiment is being formed at T = 0 K. The minimum potential difference needed to observe any Balmer series lines in the emission spectra will be V = α/10, where α = ________.

  Your answer

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• MCQmediumWork , Power and EnergyVertical Circular Motion

  A stone of mass 900g is tied to a string and moved in a vertical circle of radius 1m making 10 rpm. The tension in the string, when the stone is at the lowest point is (if π² = 9.8 and g = 9.8 m/s²)

  Options

  • Option A

    97 N

  • Option B

    9.8 N

  • Option C

    8.82 N

  • Option D

    17.8 N

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• MCQmediumCurrent electricityCircuit Theory & Kirchhoff’s Laws

  In the given circuit, the current in resistance R₃ is :

  

  Options

  • Option A

    1 A

  • Option B

    1.5 A

  • Option C

    2 A

  • Option D

    2.5 A

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• MCQeasyAC CircuitsAverage Value, RMS Value and Peak Value of Alternating Current

  In an a.c. circuit, voltage and current are given by : V = 100 sin (100 t) V and I = 100 sin (100 t + π/3) mA respectively. The average power dissipated in one cycle is :

  Options

  • Option A

    5 W

  • Option B

    10 W

  • Option C

    2.5 W

  • Option D

    25 W

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• MCQeasyThermodynamicsKinetic Theory of Gases and Molecular Properties

  The temperature of a gas having 2.0 × 10²⁵ molecules per cubic meter at 1.38 atm (Given, k = 1.38 × 10⁻²³ JK⁻¹) is :

  Options

  • Option A

    500 K

  • Option B

    200 K

  • Option C

    100 K

  • Option D

    300 K

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• MCQmediumsemiconductorLogic Gates & Boolean Operations

  The truth table for this given circuit is :

  

  Options

  • Option A

    A B Y

    0 0 1

    0 1 1

    1 0 1

    1 1 0

  • Option B

    A B Y

    0 0 0

    0 1 1

    1 0 0

    1 1 1

  • Option C

    A B Y

    0 0 0

    0 1 0

    1 0 0

    1 1 1

  • Option D

    A B Y

    0 0 1

    0 1 0

    1 0 1

    1 1 0

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• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  A plane electromagnetic wave of frequency 35 MHz travels in free space along the X-direction. At a particular point (in space and time) $\vec{E}$= 9.6ĵ V/m. The value of magnetic field at this point is :

  Options

  • Option A

    3.2 × 10⁻⁸ k̂ T

  • Option B

    3.2 × 10⁻⁸ î T

  • Option C

    9.6ĵ T

  • Option D

    9.6 × 10⁻⁸ k̂ T

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  Given below are two statements : Statement I : Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and the electrons revolve around it, is Rutherford’s model. Statement II : An atom is a spherical cloud of positive charges with electrons embedded in it, is a special case of Rutherford’s model. In the light of the above statements, choose the most appropriate from the options given below.

  Options

  • Option A

    Both statement I and statement II are false

  • Option B

    Statement I is false but statement II is true

  • Option C

    Statement I is true but statement II is false

  • Option D

    Both statement I and statement II are true

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• MCQmediumWork , Power and EnergyVertical Circular Motion

  A bob of mass ‘m’ is suspended by a light string of length ‘L’. It is imparted a minimum horizontal velocity at the lowest point A such that it just completes half circle reaching the top most position B. The ratio of kinetic energies (K.E.)ₐ/(K.E.)ᵦ is :

  

  Options

  • Option A

    3 : 2

  • Option B

    5 : 1

  • Option C

    2 : 5

  • Option D

    1 : 5

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