29 January 2023 physics questions with solutions

Showing 1–10 of 58 questions

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

  In a metre bridge experiment the balance point is obtained if the gaps are closed by 2 Ω and 3 Ω. A shunt of X Ω is added to 3 Ω resistor to shift the balancing point by 22.5 cm. The value of X is ____.

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  JEE Mains29 January 2023Shift 1Morning Shift

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• MatchmediumUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  Match List I with List II:

  List 1

  1. A. Pressure gradient

  2. B. Energy density

  3. C. Electric Field

  4. D. Latent heat

  List 2

  1. I. [M⁰L²T⁻²]

  2. II. [ML⁻¹T⁻²]

  3. III. [ML⁻²T⁻²]

  4. IV. [MLT⁻³A⁻¹]

  Options

  • Option A

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

  • Option B

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

  • Option C

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

  • Option D

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

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  JEE Mains29 January 2023Shift 1Morning Shift

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• NumericmediumCircular MotionKinematics of Circular Motion

  A car is moving on a circular path of radius 600 m such that the magnitudes of tangential acceleration and centripetal acceleration are equal. The time taken by the car to complete first quarter of revolution, if it is moving with an initial speed of 54 km/h is t(1 - e⁻π/2) s. The value of t is ______.

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  JEE Mains29 January 2023Shift 2Evening Shift

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• A/ReasyThermodynamicsFirst Law of Thermodynamics and Its Applications

  Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

  Assertion

  If dQ and dW represent the heat supplied to the system and the work done on the system respectively, then according to the first law of thermodynamics dQ = dU - dW.

  Reason

  First law of thermodynamics is based on law of conservation of energy.

  Options

  • Option A

    A is correct but R is not correct

  • Option B

    A is not correct but R is correct

  • Option C

    Both A and R are correct and R is the correct explanation of A

  • Option D

    Both A and R are correct but R is not the correct explanation of A

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  JEE Mains29 January 2023Shift 1Morning Shift

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• NumericmediumProperties of solid and fluidViscosity, Stokes' Law and Terminal Velocity

  A metal block of base area 0.20 m² is placed on a table, as shown in figure. A liquid film of thickness 0.25 mm is inserted between the block and the table. The block is pushed by a horizontal force of 0.1 N and moves with a constant speed. If the viscosity of the liquid is 5.0 × 10⁻³ Pa s, the speed of block is ______ × 10⁻³ m/s.

  

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  JEE Mains29 January 2023Shift 2Evening Shift

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• MCQmediumElectrostaticElectric Flux & Gauss’s Law

  In a cuboid of dimension 2L × 2L × L, a charge q is placed at the centre of the surface S having area 4L². The flux through the opposite surface to S is given by:

  Options

  • Option A

    q/(12ε₀)

  • Option B

    q/(3ε₀)

  • Option C

    q/(2ε₀)

  • Option D

    q/(6ε₀)

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  JEE Mains29 January 2023Shift 1Morning Shift

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• MCQmediumElectromagnetic InductionMutual Inductance, L-C Oscillations and Transformers

  Find the mutual inductance in the arrangement, when a small circular loop of wire of radius R is placed inside a large square loop of wire of side L (L ≫ R). The loops are coplanar and their centres coincide:

  

  Options

  • Option A

    2μ₀R²/L

  • Option B

    2√2 μ₀R²/L²

  • Option C

    2√2 μ₀R²/L

  • Option D

    √2 μ₀R²/L²

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• MCQeasyPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  The ratio of de-Broglie wavelength of an α-particle and a proton accelerated from rest by the same potential is 1/√m. The value of m is:

  Options

  • Option A

    4

  • Option B

    16

  • Option C

    8

  • Option D

    2

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  JEE Mains29 January 2023Shift 2Evening Shift

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• MCQeasyNewtons law of motion and FrictionFriction in Single-Block Systems

  A block of mass m slides down the plane inclined at angle 30° with an acceleration g/4. The value of coefficient of kinetic friction will be:

  Options

  • Option A

    (2√3 + 1)/2

  • Option B

    1/(2√3)

  • Option C

    √3/2

  • Option D

    (2√3 - 1)/2

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  JEE Mains29 January 2023Shift 1Morning Shift

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• MCQmediumAC CircuitsSeries AC Circuits: Impedance, Phase Difference, Resonance and Power Factor

  For the given figures, choose the correct option:

  

  Options

  • Option A

    The rms current in circuit (b) can never be larger than that in (a)

  • Option B

    The rms current in figure (a) is always equal to that in figure (b)

  • Option C

    The rms current in circuit (b) can be larger than that in (a)

  • Option D

    At resonance, current in (b) is less than that in (a)

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  JEE Mains29 January 2023Shift 2Evening Shift

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