24 January 2023 physics questions with solutions

Showing 1–10 of 49 questions

• NumericeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  The energy released per fission of nucleus of ²⁴⁰X is 200 MeV. The energy released if all the atoms in 120g of pure ²⁴⁰X undergo fission is _____ × 10²⁵ MeV. (Given Nₐ = 6 × 10²³)

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  JEE Mains24 January 2023Shift 2Evening Shift

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• MCQeasyThermodynamicskinetic therory of gaseous

  Let γ₁ be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and γ₂ be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid rotator, the ratio, γ₁/γ₂ is

  Options

  • Option A

    27/35

  • Option B

    35/27

  • Option C

    25/21

  • Option D

    21/25

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• NumericmediumWork , Power and EnergyPower

  A body of mass 1 kg begins to move under the action of a time dependent force $\overrightarrow{F}$ = (tî + 3t²ĵ) N, where î and ĵ are the unit vectors along x and y axis. The power developed by above force, at the time t = 2s. will be _______W.

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• MCQeasyMathematical tools and vectorVectors

  If two vectors $\vec{P}$ = î + 2mĵ + mk̂ and $\vec{Q}$ = 4î - 2ĵ + mk̂ are perpendicular to each other. Then, the value of m will be :

  Options

  • Option A

    1

  • Option B

    -1

  • Option C

    -3

  • Option D

    2

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• NumericeasyThermodynamicsthermal expansion solid and liquid

  A hole is drilled in a metal sheet. At 27°C, the diameter of hole is 5 cm. When the sheet is heated to 177°C, the change in the diameter of hole is d × 10⁻³ cm. The value of d will be _______ if coefficient of linear expansion of the metal is 1.6 × 10⁻⁵/°C.

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• A/Reasysemiconductorapplication of diode and zener breakdown

  Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R

  Assertion

  Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

  Reason

  The current in the forward bias is more than the current in the reverse bias for a p – n junction diode.

  Options

  • Option A

    A is false but R is true

  • Option B

    Both A and R are true but R is NOT the correct explanation of A

  • Option C

    A is true but R is false

  • Option D

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

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

  From the photoelectric effect experiment, following observations are made. Identify which of these are correct
  A. The stopping potential depends only on the work function of the metal.
  B. The saturation current increases as the intensity of incident light increases.
  C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light.
  D. Photoelectric effect can be explained using wave theory of light. Choose the correct answer from the options given below:

  Options

  • Option A

    B, C only

  • Option B

    A, C, D only

  • Option C

    B only

  • Option D

    A, B, D only

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

  A long solenoid is formed by winding 70 turns cm⁻¹. If 2.0 A current flows, then the magnetic field produced inside the solenoid is ______________ (μ₀ = 4π × 10⁻⁷ T m A⁻¹)

  Options

  • Option A

    1232 × 10⁻⁴ T

  • Option B

    176 × 10⁻⁴ T

  • Option C

    352 × 10⁻⁴ T

  • Option D

    88 × 10⁻⁴ T

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• MCQmediumThermodynamicsthermodynmic process and work done

  In an Isothermal change, the change in pressure and volume of a gas can be represented for three different temperature; T₃ > T₂ > T₁ as : Image

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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

  A cell of emf 90 V is connected across series combination of two resistors each of 100Ω resistance. A voltmeter of resistance 400Ω is used to measure the potential difference across each resistor. The reading of the voltmeter will be :

  Options

  • Option A

    40 V

  • Option B

    45 V

  • Option C

    80 V

  • Option D

    90 V

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