Physics is a scoring subject in Bihar Board Class 12th if students practice enough objective questions. MCQs test basic concepts, formulas, and applications from the complete syllabus. In this post, you will find Bihar board class 12th physics objective question 75 with option and answer, prepared as per the latest BSEB pattern. These questions are highly useful for revision, practice tests, and final board exam preparation.
Bihar Board Class 12th Physics Objective Question 75 with Option and Answer
Bihar Board Class 12th Physics Objective Questions
Q1. The SI unit of electric charge is
A) Ampere
B) Coulomb
C) Volt
D) Ohm
Answer: The correct answer is B) Coulomb.
Q2. The dimensional formula of force is
A) MLT⁻¹
B) ML²T⁻²
C) MLT⁻²
D) M⁰LT⁻²
Answer: The correct answer is C) MLT⁻².
Q3. Ohm’s law is valid when
A) Temperature is constant
B) Pressure is high
C) Voltage is zero
D) Resistance is zero
Answer: The correct answer is A) Temperature is constant.
Q4. Unit of electric field intensity is
A) J/C
B) N/C
C) C/N
D) V
Answer: The correct answer is B) N/C.
Q5. Which particle has no charge?
A) Electron
B) Proton
C) Neutron
D) Positron
Answer: The correct answer is C) Neutron.
Q6. The SI unit of resistance is
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: The correct answer is C) Ohm.
Q7. The value of acceleration due to gravity on Earth is
A) 8.9 m/s²
B) 9.8 m/s²
C) 10.8 m/s²
D) 7.8 m/s²
Answer: The correct answer is B) 9.8 m/s².
Q8. Which mirror is used as a shaving mirror?
A) Convex
B) Plane
C) Concave
D) Cylindrical
Answer: The correct answer is C) Concave.
Q9. The speed of light in vacuum is
A) 3×10⁶ m/s
B) 3×10⁷ m/s
C) 3×10⁸ m/s
D) 3×10⁹ m/s
Answer: The correct answer is C) 3×10⁸ m/s.
Q10. Which law relates current and voltage?
A) Coulomb’s law
B) Faraday’s law
C) Ohm’s law
D) Newton’s law
Answer: The correct answer is C) Ohm’s law.
Q11. The unit of magnetic flux is
A) Tesla
B) Weber
C) Gauss
D) Henry
Answer: The correct answer is B) Weber.
Q12. The SI unit of power is
A) Joule
B) Watt
C) Newton
D) Volt
Answer: The correct answer is B) Watt.
Q13. The focal length of a plane mirror is
A) Zero
B) Infinity
C) Half of radius
D) Equal to radius
Answer: The correct answer is B) Infinity.
Q14. Which device converts AC into DC?
A) Transformer
B) Generator
C) Rectifier
D) Inductor
Answer: The correct answer is C) Rectifier.
Q15. The charge of an electron is
A) +1.6×10⁻¹⁹ C
B) −1.6×10⁻¹⁹ C
C) +1 C
D) −1 C
Answer: The correct answer is B) −1.6×10⁻¹⁹ C.
Q16. Which radiation has maximum energy?
A) Infrared
B) Ultraviolet
C) X-rays
D) Gamma rays
Answer: The correct answer is D) Gamma rays.
Q17. Transformer works on the principle of
A) Mutual induction
B) Self induction
C) Ohm’s law
D) Coulomb’s law
Answer: The correct answer is A) Mutual induction.
Q18. Which quantity is scalar?
A) Velocity
B) Force
C) Displacement
D) Energy
Answer: The correct answer is D) Energy.
Q19. Unit of frequency is
A) Hertz
B) Joule
C) Watt
D) Tesla
Answer: The correct answer is A) Hertz.
Q20. The phenomenon of splitting white light is called
A) Reflection
B) Refraction
C) Dispersion
D) Diffraction
Answer: The correct answer is C) Dispersion.
Q21. Which lens is used to correct myopia?
A) Convex
B) Concave
C) Cylindrical
D) Plane
Answer: The correct answer is B) Concave.
Q22. SI unit of capacitance is
A) Farad
B) Ohm
C) Volt
D) Ampere
Answer: The correct answer is A) Farad.
Q23. The unit of magnetic field is
A) Weber
B) Tesla
C) Henry
D) Gauss
Answer: The correct answer is B) Tesla.
Q24. Which law gives direction of induced current?
A) Fleming’s left hand
B) Fleming’s right hand
C) Lenz’s law
D) Ampere’s law
Answer: The correct answer is C) Lenz’s law.
Q25. Photoelectric effect supports
A) Wave theory
B) Particle nature of light
C) Reflection
D) Refraction
Answer: The correct answer is B) Particle nature of light.
Q26. Which is a semiconductor device?
A) Diode
B) Capacitor
C) Inductor
D) Transformer
Answer: The correct answer is A) Diode.
Q27. SI unit of electric current is
A) Coulomb
B) Volt
C) Ampere
D) Ohm
Answer: The correct answer is C) Ampere.
Q28. Which mirror is used as rear-view mirror?
A) Plane
B) Concave
C) Convex
D) Cylindrical
Answer: The correct answer is C) Convex.
Q29. The atomic number represents number of
A) Neutrons
B) Protons
C) Electrons only
D) Protons + neutrons
Answer: The correct answer is B) Protons.
Q30. Unit of electric potential is
A) Joule
B) Coulomb
C) Volt
D) Ampere
Answer: The correct answer is C) Volt.
Q31. Which wave is used in radar?
A) Radio wave
B) Microwave
C) Infrared
D) X-ray
Answer: The correct answer is B) Microwave.
Q32. The resistance of an ideal ammeter is
A) High
B) Zero
C) Infinite
D) Variable
Answer: The correct answer is B) Zero.
Q33. The resistance of an ideal voltmeter is
A) Zero
B) Low
C) High
D) Infinite
Answer: The correct answer is D) Infinite.
Q34. The energy of photon depends on
A) Speed
B) Wavelength
C) Medium
D) Direction
Answer: The correct answer is B) Wavelength.
Q35. Which law explains electromagnetic induction?
A) Coulomb’s law
B) Ohm’s law
C) Faraday’s law
D) Newton’s law
Answer: The correct answer is C) Faraday’s law.
Q36. The unit of work is
A) Newton
B) Joule
C) Watt
D) Pascal
Answer: The correct answer is B) Joule.
Q37. Which particle is emitted in beta decay?
A) Proton
B) Neutron
C) Electron
D) Alpha particle
Answer: The correct answer is C) Electron.
Q38. Which quantity remains conserved in elastic collision?
A) Velocity
B) Momentum
C) Force
D) Power
Answer: The correct answer is B) Momentum.
Q39. The unit of pressure is
A) Joule
B) Newton
C) Pascal
D) Watt
Answer: The correct answer is C) Pascal.
Q40. Which color has maximum wavelength?
A) Violet
B) Blue
C) Green
D) Red
Answer: The correct answer is D) Red.
Q41. The process of charging by rubbing is
A) Induction
B) Conduction
C) Friction
D) Radiation
Answer: The correct answer is C) Friction.
Q42. Which device is used to measure electric current?
A) Voltmeter
B) Ammeter
C) Galvanometer
D) Potentiometer
Answer: The correct answer is B) Ammeter.
Q43. The unit of inductance is
A) Weber
B) Tesla
C) Henry
D) Farad
Answer: The correct answer is C) Henry.
Q44. Which mirror always forms virtual image?
A) Concave
B) Convex
C) Plane
D) Both B and C
Answer: The correct answer is D) Both B and C.
Q45. Which radiation is used for cancer treatment?
A) X-rays
B) Infrared
C) Gamma rays
D) Microwaves
Answer: The correct answer is C) Gamma rays.
Q46. Which quantity is vector?
A) Speed
B) Mass
C) Velocity
D) Energy
Answer: The correct answer is C) Velocity.
Q47. The nucleus of an atom contains
A) Protons only
B) Neutrons only
C) Protons and neutrons
D) Electrons
Answer: The correct answer is C) Protons and neutrons.
Q48. Which device is used to step up voltage?
A) Rectifier
B) Generator
C) Transformer
D) Capacitor
Answer: The correct answer is C) Transformer.
Q49. The unit of momentum is
A) kg m/s
B) kg m²/s
C) N s⁻¹
D) J s
Answer: The correct answer is A) kg m/s.
Q50. Which semiconductor is used in transistor?
A) Copper
B) Silicon
C) Iron
D) Aluminium
Answer: The correct answer is B) Silicon.
Q51. The value of Planck’s constant is
A) 6.63×10⁻³⁴ Js
B) 9.8 m/s²
C) 3×10⁸ m/s
D) 1.6×10⁻¹⁹ C
Answer: The correct answer is A) 6.63×10⁻³⁴ Js.
Q52. Which law explains reflection of light?
A) Snell’s law
B) Newton’s law
C) Laws of reflection
D) Ohm’s law
Answer: The correct answer is C) Laws of reflection.
Q53. Which quantity is measured in lux?
A) Intensity
B) Luminous flux
C) Illuminance
D) Brightness
Answer: The correct answer is C) Illuminance.
Q54. The unit of heat is
A) Watt
B) Joule
C) Newton
D) Pascal
Answer: The correct answer is B) Joule.
Q55. The force between two charges is given by
A) Faraday’s law
B) Coulomb’s law
C) Ohm’s law
D) Ampere’s law
Answer: The correct answer is B) Coulomb’s law.
Q56. The resistance of a wire depends on
A) Length
B) Area
C) Material
D) All of these
Answer: The correct answer is D) All of these.
Q57. Which wave does not require medium?
A) Sound wave
B) Water wave
C) Light wave
D) Seismic wave
Answer: The correct answer is C) Light wave.
Q58. The unit of angular velocity is
A) rad/s
B) m/s
C) m/s²
D) N/m
Answer: The correct answer is A) rad/s.
Q59. Which mirror has positive focal length?
A) Plane
B) Concave
C) Convex
D) None
Answer: The correct answer is C) Convex.
Q60. The phenomenon of bending of light is
A) Reflection
B) Refraction
C) Dispersion
D) Diffraction
Answer: The correct answer is B) Refraction.
Q61. Which device stores electric charge?
A) Inductor
B) Capacitor
C) Transformer
D) Rectifier
Answer: The correct answer is B) Capacitor.
Q62. The unit of EMF is
A) Joule
B) Ampere
C) Volt
D) Watt
Answer: The correct answer is C) Volt.
Q63. Which particle has maximum mass?
A) Electron
B) Proton
C) Neutron
D) Positron
Answer: The correct answer is C) Neutron.
Q64. The resistance decreases when temperature
A) Increases
B) Decreases
C) Remains same
D) Doubles
Answer: The correct answer is B) Decreases.
Q65. Which law is used in electric motor?
A) Faraday’s law
B) Fleming’s left hand rule
C) Fleming’s right hand rule
D) Lenz’s law
Answer: The correct answer is B) Fleming’s left hand rule.
Q66. Which mirror is used in solar cooker?
A) Convex
B) Plane
C) Concave
D) Cylindrical
Answer: The correct answer is C) Concave.
Q67. The unit of charge density is
A) C/m
B) C/m²
C) C/m³
D) N/C
Answer: The correct answer is C) C/m³.
Q68. Which radiation has shortest wavelength?
A) X-rays
B) Ultraviolet
C) Infrared
D) Gamma rays
Answer: The correct answer is D) Gamma rays.
Q69. The resistance of superconductor is
A) High
B) Low
C) Zero
D) Infinite
Answer: The correct answer is C) Zero.
Q70. The unit of intensity of magnetic field is
A) Tesla
B) Ampere/meter
C) Weber
D) Henry
Answer: The correct answer is B) Ampere/meter.
Q71. Which device amplifies signals?
A) Diode
B) Capacitor
C) Transistor
D) Rectifier
Answer: The correct answer is C) Transistor.
Q72. The unit of wavelength is
A) Hertz
B) Meter
C) Second
D) Joule
Answer: The correct answer is B) Meter.
Q73. Which quantity is measured in Newton?
A) Energy
B) Power
C) Force
D) Pressure
Answer: The correct answer is C) Force.
Q74. Which phenomenon proves wave nature of light?
A) Photoelectric effect
B) Interference
C) Compton effect
D) Nuclear fission
Answer: The correct answer is B) Interference.
Q75. The unit of time period is
A) Hertz
B) Second
C) Meter
D) Joule
Answer: The correct answer is B) Second.
FAQs-Bihar Board Class 12th Physics Objective Question 75 with Option and Answer
FAQ 1. Are these Physics objective questions useful for Bihar Board Class 12th exam?
Yes, these objective questions are very useful for Bihar Board Class 12th Physics exam because they are based on the latest syllabus and exam pattern. Regular practice of such MCQs helps students understand concepts clearly and improve their performance in the board examination.
FAQ 2. Do these 75 MCQs cover the complete Bihar Board Class 12th Physics syllabus?
These 75 MCQs cover all major topics such as Electrostatics, Current Electricity, Magnetism, Optics, Modern Physics, Atoms and Nuclei, and Semiconductor Electronics. They are ideal for quick revision before exams.
FAQ 3. How should students practice these objective questions effectively?
Students should first attempt all questions without seeing the answers, then check their responses. Revising weak topics and practicing similar MCQs regularly will help in increasing accuracy and confidence.
FAQ 4. Are these MCQs helpful for objective sections and competitive exams?
Yes, these MCQs are helpful not only for the Bihar Board exam but also for other competitive exams where basic Physics concepts are tested through objective questions.
FAQ 5. Can these questions be used for last-minute revision?
Absolutely. These 75 objective questions are perfect for last-minute revision as they cover important formulas, laws, and concepts in a short and easy-to-revise format.
Conclusion
The collection of Bihar board class 12th physics objective question 75 with option and answer provided in this blog is a complete practice set for students preparing for their board examination. Objective questions play a vital role in scoring well, and consistent practice can make a big difference in results. By solving these MCQs regularly, students can strengthen their conceptual understanding, improve speed, and boost confidence. Bookmark this post and revise it multiple times to achieve better marks in the Bihar Board Class 12th Physics exam.