31 January 2023 physics questions with solutions

Showing 1–10 of 57 questions

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

  If R, $X_{L}$and $X_{C}$ represent resistance, inductive reactance and capacitive reactance, then which of the following is dimensionless?

  Options

  • Option A

    R $X_{L}X_{C}$

  • Option B

    R/$\sqrt{X_{C}X_{L}}$

  • Option C

    R/$X_{L}X_{C}$

  • Option D

    R $X_{L}$/$X_{C}$

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  JEE Mains31 January 2023Shift 1Morning Shift

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• NumericmediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  Two discs of same mass and different radii are made of different materials such that their thicknesses are 1 cm and 0.5 cm respectively. The densities of materials are in ratio 3:5. The moments of inertia of these discs about their diameters are in the ratio x/6. The value of x is ______.

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  JEE Mains31 January 2023Shift 2Evening Shift

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• NumericeasyKinematics part-3 Relative motionRiver problem

  The speed of a swimmer is 4 km h⁻¹ in still water. If the swimmer makes strokes normal to the flow of a river of width 1 km, he reaches a point 750 m downstream on the opposite bank. The speed of river water is ______ km h⁻¹.

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  JEE Mains31 January 2023Shift 1Morning Shift

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• MCQeasyAtomic Structure and X-raysAtomic Structure & Bohr's Atomic Model

  The radius of electron's second stationary orbit in Bohr's atom is R. The radius of 3rd orbit will be:

  Options

  • Option A

    R/3

  • Option B

    2.25R

  • Option C

    3R

  • Option D

    9R

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• NumericmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  Two light waves of wavelengths 800 nm and 600 nm are used in Young's double slit experiment to obtain interference fringes on a screen 7 m away. If slit separation is 0.35 mm, the shortest distance from central bright maximum where bright fringes of the two wavelengths coincide is ______ mm.

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• MCQeasyElectrostaticConductors & Electrostatic Properties

  Which of the following correctly represents the variation of electric potential V of a charged spherical conductor of radius R with radial distance r from the centre?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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  JEE Mains31 January 2023Shift 1Morning Shift

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• MCQeasySimple Harmonic MotionKinetic Energy, Potential Energy and Conservation of Energy in SHM

  The maximum potential energy of a block executing simple harmonic motion is 25 J. A is amplitude of oscillation. At A/2, the kinetic energy of the block is:

  Options

  • Option A

    37.5 J

  • Option B

    9.75 J

  • Option C

    18.75 J

  • Option D

    12.5 J

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• NumericmediumCapacitorRC Circuits: Charging & Discharging

  For the given circuit, in the steady state, |$V_{B}$ - $V_{D}$| = ______ V.

  

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  Two identical cells, when connected either in parallel or in series, give the same current in an external resistance 5 Ω. The internal resistance of each cell is ______ Ω.

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• NumericeasyCenter of maas , Momentum and CollisionCollisions: Elastic & Inelastic

  A ball is dropped from a height of 20 m. If coefficient of restitution for collision between ball and floor is 0.5, after hitting the floor the ball rebounds to a height of ______ m.

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