JEE Mains 2024 30 Jan Morning Shift physics questions with solutions

Showing 1–10 of 30 questions

• NumericmediumElectromagnetic Inductionmotional emf and induced emf in rotating rod

  A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth in that region is 0.5 G and angle of dip is 30º. The emf induced across the blades is Nπ × 10⁻⁵ V. The value of N is _____ .

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• NumericmediumRotational Motionangular momentum in pure rotation and its conservation

  Consider a Disc of mass 5 kg, radius 2m, rotating with angular velocity of 10 rad/s about an axis perpendicular to the plane of rotation. An identical disc is kept gently over the rotating disc along the same axis. The energy dissipated so that both the discs continue to rotate together without slipping is _____ J.

  

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• NumericmediumCapacitorconnecting of capacitor with battery,connenctiong of two capacitor

  A capacitor of capacitance C and potential V has energy E. It is connected to another capacitor of capacitance 2 C and potential 2V. Then the loss of energy is (x/3)E, where x is _____ .

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• NumericmediumWave Motionorgan pipe and resonance tube

  In a closed organ pipe, the frequency of fundamental note is 30 Hz. A certain amount of water is now poured in the organ pipe so that the fundamental frequency is increased to 110 Hz. If the organ pipe has a cross-sectional area of 2 cm², the amount of water poured in the organ tube is _______ g. (Take speed of sound in air is 330 m/s)

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• MCQeasyWork , Power and Energyconservation of mechanical energy

  A particle is placed at the point A of a frictionless track ABC as shown in figure. It is gently pushed toward right. The speed of the particle when it reaches the point B is : (Take g = 10 m/s²).

  

  Options

  • Option A

    20 m/s

  • Option B

    √10 m/s

  • Option C

    2√10 m/s

  • Option D

    10 m/s

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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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• MCQmediumElectromagnetic InductionMutual induction and L-C oscillations,transformer

  Primary coil of a transformer is connected to 220 V ac. Primary and secondary turns of the transforms are 100 and 10 respectively. Secondary coil of transformer is connected to two series resistance shown in shown in figure. The output voltage (V₀) is :

  

  Options

  • Option A

    7 V

  • Option B

    15 V

  • Option C

    44 V

  • Option D

    22 V

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• NumericeasyMagnetic effect of currentmagnetic force between current carring wire

  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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• MCQeasyUnit dimension and errorDimension and its application

  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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• MCQeasyProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  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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