Bihar Board Class 12 Physics 75 Objective

For students preparing for the Class 12 board exam, practicing objective questions is the most effective way to score maximum marks. The Bihar Board Class 12 Physics 75 question object with one word answer pattern is very important because the objective section tests your conceptual clarity, formulas, laws, and definitions.

Class 12 Physics 75 Objective
Class 12 Physics 75 Objective

The Bihar School Examination Board (BSEB) includes a large number of MCQs (Multiple Choice Questions) in the Physics paper. To help you in last-minute revision and exam practice, here is a complete set of 75 Class 12 Physics 75 objective  questions with options, strictly based on the Class 12 syllabus.

Bihar Board Class 12 Physics 75 Objective

Bihar Board Class 12 Physics – 75 Objective Questions (MCQs)

Electric Charges and Fields

  1. SI unit of electric charge is
    A) Ampere
    B) Coulomb
    C) Volt
    D) Ohm
    Ans: B
  2. Charge on an electron is
    A) Positive
    B) Negative
    C) Neutral
    D) Variable
    Ans: B
  3. Coulomb’s law is applicable to
    A) Moving charges
    B) Stationary charges
    C) Magnetic poles
    D) Currents
    Ans: B
  4. Electric field is a
    A) Scalar quantity
    B) Vector quantity
    C) Tensor quantity
    D) Dimensionless quantity
    Ans: B
  5. Electric field lines end on
    A) Positive charge
    B) Neutral body
    C) Negative charge
    D) Conductor
    Ans: C

Electrostatic Potential and Capacitance

  1. Unit of electric potential is
    A) Joule
    B) Volt
    C) Coulomb
    D) Ampere
    Ans: B
  2. Device used to store electric charge
    A) Resistor
    B) Inductor
    C) Capacitor
    D) Transformer
    Ans: C
  3. SI unit of capacitance is
    A) Farad
    B) Henry
    C) Tesla
    D) Ohm
    Ans: A
  4. Potential inside a conductor is
    A) Zero
    B) Maximum
    C) Variable
    D) Constant
    Ans: D
  5. Dielectric constant is
    A) Always less than 1
    B) Always equal to 1
    C) Always greater than 1
    D) Zero
    Ans: C

Current Electricity

  1. SI unit of electric current
    A) Volt
    B) Ampere
    C) Ohm
    D) Watt
    Ans: B
  2. Instrument used to measure current
    A) Voltmeter
    B) Ammeter
    C) Galvanometer
    D) Potentiometer
    Ans: B
  3. Ohm’s law relates
    A) Power, energy, time
    B) Voltage, current, resistance
    C) Charge, mass, time
    D) Force, mass, acceleration
    Ans: B
  4. Unit of resistance is
    A) Farad
    B) Henry
    C) Ohm
    D) Joule
    Ans: C
  5. Drift velocity of electrons is maximum in
    A) Insulators
    B) Semiconductors
    C) Conductors
    D) Vacuum
    Ans: C

Moving Charges and Magnetism

  1. SI unit of magnetic field
    A) Weber
    B) Tesla
    C) Gauss
    D) Henry
    Ans: B
  2. Direction of magnetic field around conductor is given by
    A) Fleming’s left hand rule
    B) Fleming’s right hand rule
    C) Right-hand thumb rule
    D) Maxwell rule
    Ans: C
  3. Force acting on moving charge is
    A) Electric force
    B) Magnetic force
    C) Lorentz force
    D) Nuclear force
    Ans: C
  4. SI unit of magnetic flux
    A) Tesla
    B) Weber
    C) Henry
    D) Ampere
    Ans: B
  5. A current-carrying conductor produces
    A) Heat only
    B) Light only
    C) Magnetic field
    D) Electric field only
    Ans: C

Magnetism and Matter

  1. Strongly magnetic materials are
    A) Diamagnetic
    B) Paramagnetic
    C) Ferromagnetic
    D) Non-magnetic
    Ans: C
  2. Weakly repelled materials are
    A) Paramagnetic
    B) Ferromagnetic
    C) Diamagnetic
    D) Conductors
    Ans: C
  3. Magnetic permeability is denoted by
    A) ε
    B) μ
    C) φ
    D) λ
    Ans: B
  4. Unit of magnetic moment
    A) Tesla
    B) Weber
    C) Ampere-meter²
    D) Henry
    Ans: C
  5. Earth behaves like a
    A) Capacitor
    B) Electric dipole
    C) Magnetic dipole
    D) Solenoid
    Ans: C

Electromagnetic Induction

  1. Induced emf is explained by
    A) Ohm
    B) Faraday
    C) Newton
    D) Maxwell
    Ans: B
  2. Direction of induced current is given by
    A) Fleming’s rule
    B) Lenz’s law
    C) Coulomb’s law
    D) Ampere’s law
    Ans: B
  3. SI unit of inductance
    A) Farad
    B) Tesla
    C) Henry
    D) Weber
    Ans: C
  4. Device converting mechanical energy into electrical energy
    A) Motor
    B) Generator
    C) Transformer
    D) Battery
    Ans: B
  5. Eddy currents cause
    A) Cooling
    B) Heating
    C) Reflection
    D) Refraction
    Ans: B

Alternating Current

  1. Frequency of AC supply in India
    A) 25 Hz
    B) 50 Hz
    C) 60 Hz
    D) 100 Hz
    Ans: B
  2. RMS value of AC depends on
    A) Peak value
    B) Frequency
    C) Phase
    D) Resistance
    Ans: A
  3. Power factor is equal to
    A) Sinφ
    B) Tanφ
    C) Cosφ
    D) Secφ
    Ans: C
  4. Transformer works on
    A) DC only
    B) AC only
    C) Both AC & DC
    D) None
    Ans: B
  5. Choke coil has high
    A) Resistance
    B) Inductance
    C) Capacitance
    D) Voltage
    Ans: B

Electromagnetic Waves

  1. Speed of electromagnetic waves in vacuum
    A) 3×10⁶ m/s
    B) 3×10⁷ m/s
    C) 3×10⁸ m/s
    D) 3×10⁹ m/s
    Ans: C
  2. EM waves do not require
    A) Energy
    B) Medium
    C) Frequency
    D) Wavelength
    Ans: B
  3. Highest frequency radiation is
    A) Infrared
    B) Ultraviolet
    C) X-rays
    D) Gamma rays
    Ans: D
  4. TV remote uses
    A) Radio waves
    B) Microwaves
    C) Infrared rays
    D) UV rays
    Ans: C
  5. Visible light range is
    A) 200–300 nm
    B) 300–400 nm
    C) 400–700 nm
    D) 700–900 nm
    Ans: C

Optics, Modern Physics & Electronics

  1. Unit of power of lens
    A) Meter
    B) Dioptre
    C) Watt
    D) Joule
    Ans: B
  2. Bending of light around an obstacle is
    A) Reflection
    B) Refraction
    C) Diffraction
    D) Polarization
    Ans: C
  3. Photoelectric effect proves
    A) Wave nature of light
    B) Particle nature of light
    C) Magnetic nature of light
    D) Thermal nature of light
    Ans: B
  4. Energy of photon depends on
    A) Mass
    B) Speed
    C) Frequency
    D) Amplitude
    Ans: C
  5. Pure semiconductor is
    A) Intrinsic
    B) Extrinsic
    C) Conductor
    D) Insulator
    Ans: A

Semiconductors & Communication (46–75)

  1. Majority carrier in n-type semiconductor
    Class 12 Physics 75 Objective
    Class 12 Physics 75 Objective

    A) Hole
    B) Proton
    C) Electron
    D) Neutron
    Ans: C

  2. Majority carrier in p-type semiconductor
    A) Electron
    B) Hole
    C) Neutron
    D) Proton
    Ans: B
  3. Rectifier uses
    A) Transistor
    B) Diode
    C) Capacitor
    D) Inductor
    Ans: B
  4. Amplifier uses
    A) Diode
    B) Capacitor
    C) Transformer
    D) Transistor
    Ans: D
  5. Unit of atomic energy
    A) Joule
    B) Watt
    C) eV
    D) Coulomb
    Ans: C
  6. Ground state energy of hydrogen atom
    A) −10.2 eV
    B) −13.6 eV
    C) −3.4 eV
    D) 0 eV
    Ans: B
  7. Nuclear fission releases
    A) Matter
    B) Charge
    C) Energy
    D) Light
    Ans: C
  8. SI unit of radioactivity
    A) Curie
    B) Becquerel
    C) Gray
    D) Sievert
    Ans: B
  9. Alpha particle is
    A) Proton
    B) Electron
    C) Helium nucleus
    D) Neutron
    Ans: C
  10. Nuclear fusion occurs in
    A) Earth
    B) Reactor
    C) Sun
    D) Atom
    Ans: C
  11. Lens used in myopia
    A) Convex
    B) Concave
    C) Cylindrical
    D) Plane
    Ans: B
  12. Lens used in hypermetropia
    A) Convex
    B) Concave
    C) Cylindrical
    D) Plane
    Ans: A
  13. Young’s experiment proves
    A) Reflection
    B) Refraction
    C) Interference
    D) Polarization
    Ans: C
  14. Polarization proves light is
    A) Longitudinal
    B) Transverse
    C) Mechanical
    D) Thermal
    Ans: B
  15. AM stands for
    A) Angular Modulation
    B) Amplitude Modulation
    C) Average Modulation
    D) Audio Modulation
    Ans: B
  16. FM stands for
    A) Frequency Modulation
    B) Force Modulation
    C) Field Modulation
    D) Fast Modulation
    Ans: A
  17. Microphone converts
    A) Electrical to sound
    B) Sound to electrical
    C) Light to sound
    D) Heat to sound
    Ans: B
  18. Speaker converts
    A) Electrical to sound
    B) Sound to electrical
    C) Heat to sound
    D) Light to sound
    Ans: A
  19. Unit of wavelength
    A) Hertz
    B) Meter
    C) Second
    D) Joule
    Ans: B
  20. Planck’s constant unit
    A) Joule
    B) Joule-second
    C) Watt
    D) Newton
    Ans: B
  21. de Broglie wavelength depends on
    A) Energy
    B) Velocity
    C) Momentum
    D) Force
    Ans: C
  22. Work function is minimum energy for
    A) Ionization
    B) Emission
    C) Reflection
    D) Refraction
    Ans: B
  23. Magnetic field around straight conductor is
    A) Radial
    B) Circular
    C) Linear
    D) Uniform
    Ans: B
  24. Solenoid behaves like
    A) Capacitor
    B) Bar magnet
    C) Resistor
    D) Battery
    Ans: B
  25. Electric current is flow of
    A) Energy
    B) Mass
    C) Charge
    D) Force
    Ans: C
  26. Resistance increases with
    A) Decrease in temperature
    B) Increase in temperature
    C) Pressure
    D) Area
    Ans: B
  27. Semiconductor devices are used in
    Class 12 Physics 75 Objective
    Class 12 Physics 75 Objective

    A) Analog only
    B) Digital only
    C) Both analog & digital
    D) Mechanical systems
    Ans: C

  28. Communication uses
    A) Sound waves
    B) Mechanical waves
    C) Electromagnetic waves
    D) Water waves
    Ans: C
  29. Modulation reduces
    A) Noise
    B) Antenna height
    C) Frequency
    D) Energy
    Ans: B
  30. Logic circuits are based on
    A) Physics
    B) Chemistry
    C) Biology
    D) Digital electronics
    Ans: D

Conclusion-Class 12 Physics 75 Objective

This Bihar Board Class 12 Physics 75 question object with one word answer (all objective MCQs) set is ideal for final revision, practice tests, and exam confidence. Regular practice of these MCQs will significantly improve your speed, accuracy, and score in the board exam.

Class 12 Physics 75 Objective

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