Physics question bank with solutions

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• MCQeasysemiconductorP–N Junction Diode & Forward–Reverse Bias

  In a p–n junction, choose the correct potential condition for the two sides at equilibrium.

  Options

  • Option A

    p-side is at lower potential and n-side at higher potential

  • Option B

    p and n are at the same electric potential everywhere

  • Option C

    p-side is at higher potential than n-side

  • Option D

    There is no junction barrier

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  AIPMT 2001NEET Previous Year

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• NumericdifficultMagnetic effect of currentMagnetic Dipole Moment, Torque and Equilibrium of Current-Carrying Loops

  A conducting solid sphere of radius R and mass M carries charge Q and rotates with angular speed ω about a diameter. The ratio of magnetic dipole moment to angular momentum is αQ/(2M). Find α.

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• Multi-correctmediumMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  A particle enters normally into a uniform magnetic strip. Its magnetic radius r is fixed while the strip width d is increased from 0 toward r. Which statements are correct?

  Select all that apply

  • Option A

    The exit deflection angle increases.

  • Option B

    The time spent in the field increases.

  • Option C

    At d=r the trajectory reaches the far boundary tangentially.

  • Option D

    For d<r the particle crosses the far boundary.

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• MCQmediumGeometrical opticsLaws of Reflection & Plane Mirrors

  Consider two very small plane mirrors. If the object is at a large distance from mirrors then number of images formed by the mirror system will be

  

  Options

  • Option A

    1

  • Option B

    2

  • Option C

    ∞

  • Option D

    none of these

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• MCQmediumElectromagnetic Induction

  Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon-

  Options

  • Option A

    the rates at which currents are changing in the two coils

  • Option B

    relative position and orientation of the two coils

  • Option C

    the materials of the wires of the coils

  • Option D

    the currents in the two coils

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  JEE Mains

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• IntegermediumElectrostaticConductors & Electrostatic Properties

  Three concentric spherical metallic shells X, Y and Z of radii a, b and c (a < b < c) have surface charge densities +σ, -σ and +σ respectively. Shells X and Z are at the same potential. If a = 2 cm and b = 3 cm, find c in cm.

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• IntegermediumMathematical tools and vectorGeometry & Mensuration

  A right circular cone has radius 5 cm and height 12 cm. Find its slant height in cm.

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• MCQeasyNuclear physicsNuclear Fission, Fusion & Nuclear Reactors

  In a nuclear power station, which sequence most correctly describes the conversion of nuclear energy into electrical energy?

  Options

  • Option A

    Nuclear energy → reactor heat → steam or working-fluid motion → turbine mechanical energy → electrical energy

  • Option B

    Nuclear energy → electrical energy directly inside the uranium nucleus

  • Option C

    Nuclear energy → chemical energy → electrical energy

  • Option D

    Neutron energy → electron mass → nuclear energy

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• MCQmediumsemiconductorLogic Gates & Boolean Operations

  Refer to the logic circuit shown in the figure. Which input combination makes both LED-1 and LED-2 glow simultaneously?

  

  Options

  • Option A

    A = 0, B = 1, C = 1

  • Option B

    A = 1, B = 0, C = 0

  • Option C

    A = 1, B = 0, C = 1

  • Option D

    A = 1, B = 1, C = 0

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• MCQeasyWave MotionWave Motion and General Equation of Travelling Waves

  A mechanical disturbance is to propagate through a material medium as a wave. The particles of the medium are not transported permanently with the disturbance; instead, each particle oscillates about its equilibrium position while the disturbance moves forward. Which pair of properties of the medium is fundamentally responsible for this propagation?

  Options

  • Option A

    Inertia and elasticity

  • Option B

    Density and temperature only

  • Option C

    Momentum and pressure only

  • Option D

    Viscosity and surface tension only

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