JEE Mains 2024 30 Jan Evening Shift physics questions with solutions

Showing 1–10 of 30 questions

• NumericeasyElectromagnetic InductionMutual induction and L-C oscillations,transformer

  A power transmission line feeds input power at 2.3 kV to a step down transformer with its primary winding having 3000 turns. The output power is delivered at 230 V by the transformer. The current in the primary of the transformer is 5A and its efficiency is 90%. The winding of transformer is made of copper. The output current of transformer is_____A.

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• NumericmediumCurrent electricityelectric instruments

  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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• NumericeasyMathematical tools and vector

  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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• 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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• NumericmediumGeometrical opticslens and combination lens,silvered lens

  In an experiment to measure the focal length (f) of a convex lens, the magnitude of object distance (x) and the image distance (y) are measured with reference to the focal point of the lens. The y-x plot is shown in figure. The focal length of the lens is_____cm.

  

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• NumericeasyProperties of solid and fluidproperties of fluid and surface tension

  A big drop is formed by coalescing 1000 small identical drops of water. If E₁ be the total surface energy of 1000 small drops of water and E₂ be the surface energy of single big drop of water, the E₁ : E₂ is x : 1 where x = ________.

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• MCQeasyThermodyanmicsheat and principle of calorimeter

  A block of ice at –10°C is slowly heated and converted to steam at 100°C. Which of the following curves represent the phenomenon qualitatively:

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• MCQmediumThermodyanmicsthermodynmic process and work done

  If three moles of monoatomic gas (γ = 5/3) is mixed with two moles of a diatomic gas (γ = 7/5), the value of adiabatic exponent γ for the mixture is:

  Options

  • Option A

    1.75

  • Option B

    1.40

  • Option C

    1.52

  • Option D

    1.35

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Match List I with List II

  List-I
  A. Gauss’s law of magnetostatics
  B. Faraday’s law of electro magnetic induction
  C. Ampere’s law
  D. Gauss’s law of electrostatics

  List-II

  I. ∮$\vec{E}$·$\vec{dA}$ = (1/ε₀)∫ρ dV

  II. $\int\vec{B.}\vec{dA}$= 0

  III.$\int\vec{E}.\vec{dl}$= -d/dt ∫ $\vec{B.}\vec{dl}$

  IV. ∮$\vec{B}.\vec{dl}$= μ₀I

  Choose the correct answer from the options given below:

  Options

  • Option A

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

  • Option B

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

  • Option C

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

  • Option D

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

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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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