JEE Mains 2024 30 Jan Evening Shift physics questions with solutions

Showing 1–10 of 30 questions

• MCQeasyThermodynamicsHeat, Specific Heat Capacity, Latent Heat and Calorimetry

  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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• MCQeasyUnits, Dimensions, Measurements and ErrorsVernier Calipers and Screw Gauge: Measurement and Errors

  If 50 Vernier divisions are equal to 49 main scale divisions of a travelling microscope and one smallest reading of main scale is 0.5 mm, the Vernier constant of travelling microscope is:

  Options

  • Option A

    0.1 mm

  • Option B

    0.1 cm

  • Option C

    0.01 cm

  • Option D

    0.01 mm

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• NumericmediumRotational MotionAngular Momentum & Its Conservation

  Two discs of moment of inertia I₁ = 4 kg m² and I₂ = 2 kg m² about their central axes & normal to their planes, rotating with angular speeds 10 rad/s & 4 rad/s respectively are brought into contact face to face with their axe of rotation coincident. The loss in kinetic energy of the system in the process is_____J.

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• NumericeasyGravitationAcceleration Due to Gravity & Escape Velocity

  A simple pendulum is placed at a place where its distance from the earth’s surface is equal to the radius of the earth. If the length of the string is 4m, then the time period of small oscillations will be _______s. [take g = π² ms⁻²]

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• Multi-correctmediumThermodynamicsThermodynamic Processes, P-V Diagrams and Work Done

  Choose the correct statement for processes A & B shown in figure.

  

  Select all that apply

  • Option A

    PVᵞ = k for process B and PV = k for process A.

  • Option B

    PV = k for process B and A.

  • Option C

    $P^(γ-1)/T^γ$ = k for process B and T = k for process A.

  • Option D

    $T^γ/P^(γ-1)$ = k for process A and PV = k for process B.

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• MCQeasyPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  If the total energy transferred to a surface in time t is 6.48 × 10⁵ J, then the magnitude of the total momentum delivered to this surface for complete absorption will be :

  Options

  • Option A

    2.46 × 10⁻³ kg m/s

  • Option B

    2.16 × 10⁻³ kg m/s

  • Option C

    1.58 × 10⁻³ kg m/s

  • Option D

    4.32 × 10⁻³ kg m/s

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• MCQeasyCurrent electricityCells, Maximum Power & Heating Effect

  When a potential difference V is applied across a wire of resistance R, it dissipates energy at a rate W. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the same supply, the energy dissipation rate will become:

  Options

  • Option A

    1/4W

  • Option B

    1/2W

  • Option C

    2W

  • Option D

    4W

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• MCQeasyWave OpticsPolarisation of Light

  A beam of unpolarised light of intensity I₀ is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of emergent light is :

  Options

  • Option A

    I₀/4

  • Option B

    I₀

  • Option C

    I₀/2

  • Option D

    I₀/8

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

  If mass is written as m = kcᴾG⁻¹ᐟ²h¹ᐟ² then the value of P will be : (Constants have their usual meaning with k a dimensionless constant)

  Options

  • Option A

    1/2

  • Option B

    1/3

  • Option C

    2

  • Option D

    –1/3

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

  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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