Preparing for the Bihar Board Class 12 Physics exam becomes easier when you solve high-quality objective questions based on the latest syllabus. To help you revise effectively, here we provide Bihar Board Class 12th Physics 75 Objective Question with Answer.
All 75 questions include four options and correct answers, covering important chapters such as Electrostatics, Magnetism, Optics, Alternating Current, Electronic Devices, Communication, Dual Nature of Matter, and Modern Physics.
These questions will boost your confidence and help you score excellent marks in the upcoming board exams.
Bihar Board Class 12th Physics 75 Objective Question with Answer | Full MCQ Set 2025
1. SI unit of electric charge is:
a) Volt
b) Coulomb
c) Farad
d) Ohm
Answer: b)
2. Electric flux is given by:
a) EA
b) E/A
c) E²A
d) 1/E
Answer: a)
3. Coulomb’s law is applicable for:
a) Static charges
b) Moving charges
c) Neutral bodies
d) Insulators
Answer: a)
4. The value of ε₀ is:
a) 8.85 × 10⁻¹² C²/Nm²
b) 9 × 10⁹
c) 6.67 × 10⁻¹¹
d) 1.6 × 10⁻¹⁹
Answer: a)
5. The SI unit of capacitance is:
a) Henry
b) Farad
c) Weber
d) Tesla
Answer: b)
6. A capacitor stores:
a) Charge
b) Heat
c) Light
d) Momentum
Answer: a)
7. Electric field is a:
a) Scalar
b) Vector
c) Tensor
d) None
Answer: b)
8. Ohm’s law is:
a) V = IR
b) P = VI
c) Q = It
d) V = I²R
Answer: a)
9. SI unit of resistance is:
a) Ohm
b) Volt
c) Watt
d) Henry
Answer: a)
10. Resistivity depends on:
a) Temperature
b) Length
c) Area
d) Mass
Answer: a)
11. Kirchhoff’s first law expresses conservation of:
a) Mass
b) Charge
c) Energy
d) Power
Answer: b)
12. Device used to measure current:
a) Voltmeter
b) Ammeter
c) Potentiometer
d) Multimeter
Answer: b)
13. Magnetic field inside an ideal solenoid is:
a) Zero
b) Uniform
c) Non-uniform
d) Infinite
Answer: b)
14. SI unit of magnetic flux:
a) Henry
b) Weber
c) Tesla
d) Joule
Answer: b)
15. Value of μ₀:
a) 4π × 10⁻⁷ Tm/A
b) 9 × 10⁹
c) 3 × 10⁸
d) 1.6 × 10⁻¹⁹
Answer: a)
16. Speed of light:
a) 3 × 10⁶
b) 3 × 10⁸
c) 3 × 10⁹
d) 3 × 10¹⁰
Answer: b)
17. Unit of lens power is:
a) Hertz
b) Diopter
c) Tesla
d) Joule
Answer: b)
18. Convex lens is also known as:
a) Diverging lens
b) Converging lens
c) Neutral lens
d) Cylindrical lens
Answer: b)
19. Unit of frequency:
a) Watt
b) Hertz
c) Joule
d) Ampere
Answer: b)
20. SI unit of power:
a) Watt
b) Joule
c) Henry
d) Newton
Answer: a)
21. Refractive index of vacuum is:
a) 0
b) 1
c) 2
d) Infinity
Answer: b)
22. Photoelectric effect discovered by:
a) Einstein
b) Hertz
c) Bohr
d) Maxwell
Answer: b)
23. Photon energy is:
a) mc²
b) hv
c) h/λ
d) ½ mv²
Answer: b)
24. Wave with highest frequency:
a) X-rays
b) Infrared
c) Microwave
d) Radio wave
Answer: a)
25. Nuclear force is:
a) Weak
b) Strong
c) Long-range
d) Repulsive
Answer: b)
26. Earth’s magnetic field is due to:
a) Electric charge
b) Dynamo effect
c) Rotation only
d) Solar radiation
Answer: b)
27. SI unit of potential difference:
a) Volt
b) Watt
c) Tesla
d) Newton
Answer: a)
28. Galvanometer is used to:
a) Measure voltage
b) Detect current
c) Generate EMF
d) Store charge
Answer: b)
29. Charge of electron:
a) 1.6 × 10⁻¹⁹ C
b) 3 × 10⁸
c) 9.1 × 10⁻³¹ kg
d) 6.67 × 10⁻¹¹
Answer: a)
30. Rectifier converts:
a) AC to DC
b) DC to AC
c) DC to DC
d) AC to AC
Answer: a)
31. Capacitive reactance formula:
a) XC = 1/ωC
b) XC = ωC
c) XC = RC
d) XC = L/R
Answer: a)
32. Transformer works on:
a) DC
b) AC
c) Both
d) None
Answer: b)
33. Focal length of plane mirror:
a) 0
b) Infinite
c) 1
d) –1
Answer: b)
34. Electric field inside a conductor:
a) Zero
b) Maximum
c) Constant
d) Infinite
Answer: a)
35. Light year is a unit of:
a) Time
b) Speed
c) Distance
d) Energy
Answer: c)
36. The drift velocity of electrons depends on:
a) Pressure
b) Electric field
c) Frequency
d) Distance
Answer: b)
37. Resistivity is measured in:
a) Ohm-meter
b) Henry
c) Tesla
d) Joule
Answer: a)
38. Work function is measured in:
a) Volt
b) Electron volt
c) Newton
d) Farad
Answer: b)
39. Half-life depends on:
a) Temperature
b) Pressure
c) Nature of nucleus
d) Density
Answer: c)
40. The device that converts solar energy to electrical energy:
a) Rectifier
b) Solar cell
c) Photodiode
d) LED
Answer: b)
41. SI unit of magnetic field:
a) Weber
b) Tesla
c) Henry
d) Ampere
Answer: b)
42. Lenz’s law is based on:
a) Conservation of energy
b) Conservation of charge
c) Conservation of mass
d) Conservation of momentum
Answer: a)
43. EM wave does not require:
a) Medium
b) Space
c) Energy
d) Frequency
Answer: a)
44. The displacement current was proposed by:
a) Maxwell
b) Faraday
c) Ampere
d) Hertz
Answer: a)
45. Voltage gain is given by:
a) Vout / Vin
b) Vin / Vout
c) Iout / Vin
d) Vin / Iout
Answer: a)
46. p-type semiconductor has:
a) Electrons
b) Holes
c) Protons
d) Neutrons
Answer: b)
47. n-type semiconductor has:
a) Holes
b) Electrons
c) Protons
d) None
Answer: b)
48. Logic gates are used in:
a) Mechanics
b) Digital circuits
c) Thermodynamics
d) Optics
Answer: b)
49. AND gate output is 1 when:
a) Both inputs 1
b) Either input 1
c) Both 0
d) None
Answer: a)
50. The charge carrier in metals:
a) Protons
b) Electrons
c) Neutrons
d) Holes
Answer: b)
51. Least-count of vernier caliper is:
a) 0.1 cm
b) 0.01 cm
c) 0.02 cm
d) 0.2 cm
Answer: c)
52. The process of heat transfer in solids:
a) Convection
b) Conduction
c) Radiation
d) Induction
Answer: b)
53. F = ma was given by:
a) Newton
b) Einstein
c) Gauss
d) Maxwell
Answer: a)
54. If frequency increases, wavelength:
a) Decreases
b) Increases
c) Constant
d) Doubles
Answer: a)
55. A diode allows current in:
a) One direction
b) Two directions
c) No direction
d) Multiple paths
Answer: a)
56. Modern AAA battery is:
a) AC source
b) DC source
c) Magnetic source
d) Capacitive source
Answer: b)
57. The SI unit of energy is:
a) Watt
b) Joule
c) Weber
d) Henry
Answer: b)
58. Power factor is:
a) cos φ
b) sin φ
c) tan φ
d) 1/φ
Answer: a)
59. The rainbow is due to:
a) Reflection
b) Refraction
c) Dispersion
d) Inference
Answer: c)
60. Gamma rays are:
a) Charged
b) Neutral
c) Heavy
d) Light
Answer: b)
61. The device that controls current:
a) Diode
b) Resistor
c) Transistor
d) Capacitor
Answer: c)
62. Photodiode works in:
a) Forward bias
b) Reverse bias
c) Neutral bias
d) Zero bias
Answer: b)
63. α-particle is:
a) Electron
b) Helium nucleus
c) Proton
d) Neutron
Answer: b)
64. The process of splitting heavy nuclei:
a) Fusion
b) Fission
c) Radiation
d) Emission
Answer: b)
65. Superconductors have:
a) High resistance
b) Zero resistance
c) Negative resistance
d) Infinite resistance
Answer: b)
66. EMF is defined as:
a) Work done per unit charge
b) Work done per unit mass
c) Charge per unit work
d) Power per unit current
Answer: a)
67. SI unit of momentum:
a) kg m/s
b) Newton
c) Joule
d) Henry
Answer: a)
68. The nature of light is:
a) Particle
b) Wave
c) Both
d) None
Answer: c)
69. The maximum possible value of refractive index is:
a) Less than 1
b) Equal to 1
c) Greater than 1
d) Negative
Answer: c)
70. Sound cannot travel in:
a) Vacuum
b) Water
c) Air
d) Steel
Answer: a)
71. The charge on proton is:
a) Negative
b) Zero
c) Positive
d) None
Answer: c)
72. The time period is reciprocal of:
a) Frequency
b) Velocity
c) Displacement
d) Wavelength
Answer: a)
73. The efficiency of transformer is:
a) Very low
b) 100%
c) High
d) Zero
Answer: c)
74. SI unit of magnetic moment:
a) A m²
b) Tesla
c) Henry
d) Weber
Answer: a)
75. Unit of electric field is:
a) N/C
b) J/C
c) W/C
d) A/C
Answer: a)
FAQs-Bihar Board Class 12th Physics 75 Objective
1. Are these objective questions based on the latest syllabus?
Yes, all questions are prepared according to the updated Bihar Board Class 12 Physics syllabus.
2. Will these MCQs help in scoring good marks?
Absolutely! These 75 questions cover almost every important chapter that appears in the exam.
3. Are the answers verified?
Yes, each answer is cross-checked from NCERT and standard references.
4. Can I use this for last-minute revision?
Yes, these MCQs are perfect for quick revision and practice.
5. Will you provide more MCQ sets?
Yes, you can request more 75 or 100 MCQ sets anytime.