JEE Mains 2024 30 Jan Morning Shift physics questions with solutions

Showing 1–10 of 30 questions

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

  Match List-I with List-II.

  List-I
  A. Coefficient of viscosity
  B. Surface Tension
  C. Angular momentum
  D. Rotational kinetic energy

  List-II I. [ML²T⁻²] II. [ML²T⁻¹] III. [ML⁻¹T⁻¹] IV. [ML⁰T⁻²]

  Options

  • Option A

    A–II, B–I, C–IV, D–III

  • Option B

    A–I, B–II, C–III, D–IV

  • Option C

    A–III, B–IV, C–II, D–I

  • Option D

    A–IV, B–III, C–II, D–I

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  Two cells are connected in opposition as shown. Cell E₁ is of 8 V emf and 2 Ω internal resistance; the cell E₂ is of 2 V emf and 4 Ω internal resistance. The terminal potential difference of cell E₂ is:

  

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

  The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

  Options

  • Option A

    215 nm

  • Option B

    414 nm

  • Option C

    400 nm

  • Option D

    200 nm

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• NumericmediumProperties of solid and fluidElastic Properties of Solids: Stress, Strain and Elastic Moduli

  Each of three blocks P, Q and R shown in figure has a mass of 3 kg. Each of the wire A and B has cross-sectional area 0.005 cm² and Young’s modulus 2 × 10¹¹ N m⁻². Neglecting friction, the longitudinal strain on wire B is _____ × 10⁻⁴. (Take g = 10 m/s²)

  

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• MCQeasyThermodynamicsKinetic Theory of Gases and Molecular Properties

  At which temperature the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 47ºC?

  Options

  • Option A

    80 K

  • Option B

    –73 K

  • Option C

    4 K

  • Option D

    20 K

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• MCQmediumCenter of maas , Momentum and CollisionImpulse & Impulse-Momentum Theorem

  A spherical body of mass 100 g is dropped from a height of 10 m from the ground. After hitting the ground, the body rebounds to a height of 5m. The impulse of force imparted by the ground to the body is given by : (given g = 9.8 m/s²)

  Options

  • Option A

    4.32 kg ms⁻¹

  • Option B

    43.2 kg ms⁻¹

  • Option C

    23.9 kg ms⁻¹

  • Option D

    2.39 kg ms⁻¹

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• NumericeasyMagnetic effect of currentMagnetic Force on Current carrying conductor

  The horizontal component of earth’s magnetic field at a place is 3.5 × 10⁻⁵ T. A very long straight conductor carrying current of √2 A in the direction from South east to North West is placed. The force per unit length experienced by the conductor is ……… × 10⁻⁶ N/m.

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

  A series L,R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of 1/√2. If the source of emf is changed to E = (20 sin 2000 t)V, the new power factor of the circuit will be :

  Options

  • Option A

    1/√2

  • Option B

    1/√3

  • Option C

    1/√5

  • Option D

    1/√7

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• MCQeasyProperties of solid and fluidElastic Properties of Solids: Stress, Strain and Elastic Moduli

  Young’s modules of material of a wire of length ‘L’ and cross-sectional area A is Y. If the length of the wire is doubled and cross-sectional area is halved then Young’s modules will be :

  Options

  • Option A

    Y/4

  • Option B

    4Y

  • Option C

    Y

  • Option D

    2Y

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• NumericmediumKinematics Part-1 (one dimension)Motion under constant acceleration

  The displacement and the increase in the velocity of a moving particle in the time interval of t to (t + 1) s are 125 m and 50 m/s, respectively. The distance travelled by the particle in (t + 2)th s is ____ m.

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