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.
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
- SI unit of electric charge is
A) Ampere
B) Coulomb
C) Volt
D) Ohm
Ans: B - Charge on an electron is
A) Positive
B) Negative
C) Neutral
D) Variable
Ans: B - Coulomb’s law is applicable to
A) Moving charges
B) Stationary charges
C) Magnetic poles
D) Currents
Ans: B - Electric field is a
A) Scalar quantity
B) Vector quantity
C) Tensor quantity
D) Dimensionless quantity
Ans: B - Electric field lines end on
A) Positive charge
B) Neutral body
C) Negative charge
D) Conductor
Ans: C
Electrostatic Potential and Capacitance
- Unit of electric potential is
A) Joule
B) Volt
C) Coulomb
D) Ampere
Ans: B - Device used to store electric charge
A) Resistor
B) Inductor
C) Capacitor
D) Transformer
Ans: C - SI unit of capacitance is
A) Farad
B) Henry
C) Tesla
D) Ohm
Ans: A - Potential inside a conductor is
A) Zero
B) Maximum
C) Variable
D) Constant
Ans: D - Dielectric constant is
A) Always less than 1
B) Always equal to 1
C) Always greater than 1
D) Zero
Ans: C
Current Electricity
- SI unit of electric current
A) Volt
B) Ampere
C) Ohm
D) Watt
Ans: B - Instrument used to measure current
A) Voltmeter
B) Ammeter
C) Galvanometer
D) Potentiometer
Ans: B - Ohm’s law relates
A) Power, energy, time
B) Voltage, current, resistance
C) Charge, mass, time
D) Force, mass, acceleration
Ans: B - Unit of resistance is
A) Farad
B) Henry
C) Ohm
D) Joule
Ans: C - Drift velocity of electrons is maximum in
A) Insulators
B) Semiconductors
C) Conductors
D) Vacuum
Ans: C
Moving Charges and Magnetism
- SI unit of magnetic field
A) Weber
B) Tesla
C) Gauss
D) Henry
Ans: B - 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 - Force acting on moving charge is
A) Electric force
B) Magnetic force
C) Lorentz force
D) Nuclear force
Ans: C - SI unit of magnetic flux
A) Tesla
B) Weber
C) Henry
D) Ampere
Ans: B - A current-carrying conductor produces
A) Heat only
B) Light only
C) Magnetic field
D) Electric field only
Ans: C
Magnetism and Matter
- Strongly magnetic materials are
A) Diamagnetic
B) Paramagnetic
C) Ferromagnetic
D) Non-magnetic
Ans: C - Weakly repelled materials are
A) Paramagnetic
B) Ferromagnetic
C) Diamagnetic
D) Conductors
Ans: C - Magnetic permeability is denoted by
A) ε
B) μ
C) φ
D) λ
Ans: B - Unit of magnetic moment
A) Tesla
B) Weber
C) Ampere-meter²
D) Henry
Ans: C - Earth behaves like a
A) Capacitor
B) Electric dipole
C) Magnetic dipole
D) Solenoid
Ans: C
Electromagnetic Induction
- Induced emf is explained by
A) Ohm
B) Faraday
C) Newton
D) Maxwell
Ans: B - 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 - SI unit of inductance
A) Farad
B) Tesla
C) Henry
D) Weber
Ans: C - Device converting mechanical energy into electrical energy
A) Motor
B) Generator
C) Transformer
D) Battery
Ans: B - Eddy currents cause
A) Cooling
B) Heating
C) Reflection
D) Refraction
Ans: B
Alternating Current
- Frequency of AC supply in India
A) 25 Hz
B) 50 Hz
C) 60 Hz
D) 100 Hz
Ans: B - RMS value of AC depends on
A) Peak value
B) Frequency
C) Phase
D) Resistance
Ans: A - Power factor is equal to
A) Sinφ
B) Tanφ
C) Cosφ
D) Secφ
Ans: C - Transformer works on
A) DC only
B) AC only
C) Both AC & DC
D) None
Ans: B - Choke coil has high
A) Resistance
B) Inductance
C) Capacitance
D) Voltage
Ans: B
Electromagnetic Waves
- 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 - EM waves do not require
A) Energy
B) Medium
C) Frequency
D) Wavelength
Ans: B - Highest frequency radiation is
A) Infrared
B) Ultraviolet
C) X-rays
D) Gamma rays
Ans: D - TV remote uses
A) Radio waves
B) Microwaves
C) Infrared rays
D) UV rays
Ans: C - 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
- Unit of power of lens
A) Meter
B) Dioptre
C) Watt
D) Joule
Ans: B - Bending of light around an obstacle is
A) Reflection
B) Refraction
C) Diffraction
D) Polarization
Ans: C - 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 - Energy of photon depends on
A) Mass
B) Speed
C) Frequency
D) Amplitude
Ans: C - Pure semiconductor is
A) Intrinsic
B) Extrinsic
C) Conductor
D) Insulator
Ans: A
Semiconductors & Communication (46–75)
- Majority carrier in n-type semiconductor
Class 12 Physics 75 Objective A) Hole
B) Proton
C) Electron
D) Neutron
Ans: C - Majority carrier in p-type semiconductor
A) Electron
B) Hole
C) Neutron
D) Proton
Ans: B - Rectifier uses
A) Transistor
B) Diode
C) Capacitor
D) Inductor
Ans: B - Amplifier uses
A) Diode
B) Capacitor
C) Transformer
D) Transistor
Ans: D - Unit of atomic energy
A) Joule
B) Watt
C) eV
D) Coulomb
Ans: C - Ground state energy of hydrogen atom
A) −10.2 eV
B) −13.6 eV
C) −3.4 eV
D) 0 eV
Ans: B - Nuclear fission releases
A) Matter
B) Charge
C) Energy
D) Light
Ans: C - SI unit of radioactivity
A) Curie
B) Becquerel
C) Gray
D) Sievert
Ans: B - Alpha particle is
A) Proton
B) Electron
C) Helium nucleus
D) Neutron
Ans: C - Nuclear fusion occurs in
A) Earth
B) Reactor
C) Sun
D) Atom
Ans: C - Lens used in myopia
A) Convex
B) Concave
C) Cylindrical
D) Plane
Ans: B - Lens used in hypermetropia
A) Convex
B) Concave
C) Cylindrical
D) Plane
Ans: A - Young’s experiment proves
A) Reflection
B) Refraction
C) Interference
D) Polarization
Ans: C - Polarization proves light is
A) Longitudinal
B) Transverse
C) Mechanical
D) Thermal
Ans: B - AM stands for
A) Angular Modulation
B) Amplitude Modulation
C) Average Modulation
D) Audio Modulation
Ans: B - FM stands for
A) Frequency Modulation
B) Force Modulation
C) Field Modulation
D) Fast Modulation
Ans: A - Microphone converts
A) Electrical to sound
B) Sound to electrical
C) Light to sound
D) Heat to sound
Ans: B - Speaker converts
A) Electrical to sound
B) Sound to electrical
C) Heat to sound
D) Light to sound
Ans: A - Unit of wavelength
A) Hertz
B) Meter
C) Second
D) Joule
Ans: B - Planck’s constant unit
A) Joule
B) Joule-second
C) Watt
D) Newton
Ans: B - de Broglie wavelength depends on
A) Energy
B) Velocity
C) Momentum
D) Force
Ans: C - Work function is minimum energy for
A) Ionization
B) Emission
C) Reflection
D) Refraction
Ans: B - Magnetic field around straight conductor is
A) Radial
B) Circular
C) Linear
D) Uniform
Ans: B - Solenoid behaves like
A) Capacitor
B) Bar magnet
C) Resistor
D) Battery
Ans: B - Electric current is flow of
A) Energy
B) Mass
C) Charge
D) Force
Ans: C - Resistance increases with
A) Decrease in temperature
B) Increase in temperature
C) Pressure
D) Area
Ans: B - Semiconductor devices are used in
Class 12 Physics 75 Objective A) Analog only
B) Digital only
C) Both analog & digital
D) Mechanical systems
Ans: C - Communication uses
A) Sound waves
B) Mechanical waves
C) Electromagnetic waves
D) Water waves
Ans: C - Modulation reduces
A) Noise
B) Antenna height
C) Frequency
D) Energy
Ans: B - 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.