25 January 2023 physics questions with solutions

Showing 1–10 of 59 questions

• NumericmediumGeometrical opticsapperant depth and shift due to slab

  A ray of light is incident from air on a glass plate having thickness √3 cm and refractive index √2. The angle of incidence is equal to the critical angle for the glass-air interface. The lateral displacement of the ray when it passes through the plate is ___ × 10⁻² cm. (Given sin15° = 0.26)

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  JEE Mains25 January 2023Morning Shift

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

  A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is:

  Options

  • Option A

    2.4 × 10³ A m⁻¹

  • Option B

    1.2 × 10³ A m⁻¹

  • Option C

    1 A m⁻¹

  • Option D

    2.4 × 10⁻³ A m⁻¹

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• NumericmediumCurrent electricityequivalent resistance

  In the given circuit, the equivalent resistance between terminals A and B is ___ Ω.

  

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

  Given below are two statements : Statement I : Stopping potential in photoelectric effect does not depend on the power of the light source. Statement II : For a given metal, the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light. In the light of above statements, choose the most appropriate answer from the options given below.

  Options

  • Option A

    Statement I is incorrect but statement II is correct

  • Option B

    Both Statement I and Statement II are incorrect

  • Option C

    Statement I is correct but statement II is incorrect

  • Option D

    Both statement I and statement II are correct

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

  Match List I (current configuration) with List II (magnetic field at point O). Image

  List 1

  1. (A)

     

  2. (B)

     

  3. (C)

     

  4. (D)

     

  List 2

  1. I. B₀ = μ₀I(π + 2)/(4πr)

  2. II. B₀ = μ₀I/(4r)

  3. III. B₀ = μ₀I(π - 1)/(2πr)

  4. IV. B₀ = μ₀I(π + 1)/(4πr)

  Options

  • Option A

    A-III, B-IV, C-I, D-II

  • Option B

    A-I, B-III, C-IV, D-II

  • Option C

    A-III, B-I, C-IV, D-II

  • Option D

    A-II, B-I, C-IV, D-III

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• MCQeasyElectrostaticsElectric field intensity

  A point charge of 10 μC is placed at the origin. At what location on the X-axis should a point charge of 40 μC be placed so that the net electric field is zero at x = 2 cm on the X-axis ?

  Options

  • Option A

    x = 6 cm

  • Option B

    x = 4 cm

  • Option C

    x = 8 cm

  • Option D

    x = -4 cm

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• MCQeasyCurrent electricityelectric current ,current density and resistance

  The resistance of a wire is 5 Ω. Its new resistance in ohm if stretched to 5 times of its original length will be :

  Options

  • Option A

    625

  • Option B

    5

  • Option C

    125

  • Option D

    25

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• NumericmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains a resistance R = 80 Ω, an inductor of inductive reactance X(L) = 70 Ω, and a capacitor of capacitive reactance X(C) = 130 Ω. The power factor of circuit is x/10. The value of x is :

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• MCQmediumGravitationacceleration due to gravity and escape velocity

  Assume that the earth is a solid sphere of uniform density and a tunnel is dug along its diameter throughout the earth. It is found that when a particle is released in this tunnel, it executes a simple harmonic motion. The mass of the particle is 100 g. The time period of the motion of the particle will be approximately: (Take g = 10 m s⁻², radius of earth = 6400 km)

  Options

  • Option A

    24 hours

  • Option B

    1 hour 24 minutes

  • Option C

    1 hour 40 minutes

  • Option D

    12 hours

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• NumericmediumCurrent electricitycombination of cells and maximum power theorem

  Two cells are connected between points A and B as shown. Cell 1 has emf 12 V and internal resistance 3 Ω. Cell 2 has emf 6 V and internal resistance 6 Ω. An external resistor R of 4 Ω is connected across A and B. The current flowing through R will be ______ A.

  

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