Bihar Board Inter Physics Unofficial Answer Key 2026: The Bihar School Examination Board (BSEB) is currently conducting the BSEB Class 12 Examination 2026. According to the official timetable, the Class 12 Physics Examination 2026 was conducted today, February 5, 2026, from 9:30 AM to 12:45 PM. The BSEB Class 12 Physics exam 2026 consists of a total of 100 marks, divided into a 70-mark theory paper and a 30-mark practical. Students who appeared for the Bihar Board Class 12 Physics Theory Examination 2026 can check the the Bihar Board Inter Physics Unofficial Answer Key 2026 available here with detailed exam analysis.
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Bihar Board Inter Physics Unofficial Answer Key 2026
Students can check the BSEB 2026 Class 12th Physics Unofficial Answer Key available in the table below.
| Bihar Board Inter 2026 Physics Exam Questions | Answers |
| Question 1: Who first explained electromagnetic waves mathematically ? | Maxwell |
| Question 2: Which factor of the following does not affect resistance of a conducting wire ? | Voltage applied |
| Question 3: When a dielectric is placed in an external electric field, the effective electric field inside the dielectric | decreases |
| Question 4: A capacitor of capacitance 1 µF is kept at 1V potential difference between the plates. The charge on the charged capacitor will be | 1µC |
| Question 5: If a charged particle of mass m and charge q enters a uniform magnetic field B.... | mvSinθ/qB |
| Question 6: An ideal ammeter has | zero resistance |
| Question 7: Remote controller in TV uses... | infrared waves |
| Question 8: The equivalent resistance of resistors in parallel combination | decreases |
| Question 9: The magnetic field lines inside a current-carrying solenoid are | parallel and straight |
| Question 10: Coherent sources are those sources for which | both phase difference and frequency remain constant |
| Question 11: Natural light from the sun is | unpolarised |
| Question 12: Radioactivity was discovered by | Henri Becquerel |
| Question 13: The example of a broadcast mode of communication is | Both A and C |
| Question 14: Which device is used as a voltage regulator ? | Zener Diode |
| Question 15: world wide web was invented by... | Tim Barner-Lee |
| Question 16: Electrical energy representation | V.I.t |
| Question 17: When an alpha-particle is brought towards another alpha-particle, the potential energy of the system | increased |
| Question 18: Dielectric constant of water is... | 80 |
| Question 19: The relationship between current density J and electric field intensity E is | Option D |
| Question 20: The yellow colour code value of carbon resistance is | 4 |
| Question 21: Relative permeability is equal to | Option B |
| Question 22: When an electric dipole p. is placed in a uniform electric field E.... | 90 |
| Question 23: A circular loop radius R carries a current I. Its magnetic dipole | Option D |
| Question 24: When the tube length of microscope is increased, its magnifying power | increases |
| Question 25: Cathode rays are the group of.... | electrons |
| Question 26: When a soap bubble is charged, then its size | increases |
| Question 27: If the area of plates of a capacitor is halved, then the capacitance will | become half |
| Question 28: Choke coil works on the principle of | transient current |
| Question 29: The dimensions of B/µ.... | energy density |
| Question 30: Nickel is.. | ferromagnetic |
| Question 31: In a half-wave rectifier, if the input frequency is 50 Hz, then output frequency will be | 50 Hz |
| Question 32: How many joules of energy will be released due to mass defect of 1 mg ? | Option C |
| Question 33: The ratio of de Broglie wavelength associated with two electrons accelerated through 49 V and 64 V is | 8/7 |
| Question 34: A ray of light is incident normally on a plane mirror... | 0 degree |
| Question 35: The phase difference φ is related to path difference by λ | Option B |
| Question 36: To remove hypermetropia, lens used is | convex |
| Question 37: Inverse square law of intensity of light, i.e., intensity.... | point source |
| Question 38: The kinetic energy ( K) of an electron in a Bohr orbit.... | K=-U/2 |
| Question 39: Semiconductor is damaged by the strong current due to.. | excess of electrons |
| Question 40: The valency of impurity element to convert a germanium crystal... | 3 |
| Question 41: In a communication system, a repeater is | a combination of a receiver and transmitter |
| Question 42: The maximum velocity of an electron emitted from a metal surface... | 2hv/3 |
| Question 43: If a bar magnet is cut into two equal pieces transverse to its length, then each piece will | behave as a new magnet with reduced magnetie moment |
| Question 44: In an ac circuit of capacitance the current from difference is | forward |
| Question 45: A capacitor is a perfect insulator for | direct currents |
| Question 46: The unit displacement of current is | A |
| Question 47: solar spectrum is... | continuous |
| Question 48: the field of view is maximum for... | convex mirror |
| Question 49: The ratio of the refractive index of red light to blue light in | less than unity |
| Question 50: The nuclear density is approximately | independent of mass number |
| Question 51: in a trasistor.. | concentration of impurities in the base is minimum |
| Question 52: Coulomb's law is valid for | Point charges only |
| Question 53: SI Unit of electric flux is... | Vm |
| Question 54: A cell of internal resistance ris connected to an external resistance R. The current will be maximum in R, if | R=r |
| Question 55: If L and R represent inductance and resistance respectively.... | second |
Bihar Board 2026 Inter Physics: Question Paper Analysis
Students can access the Bihar Board 2026 Class 12th Physics Exam Analysis from the table below.
| Particulars | Details |
| Bihar Board 2026 Class 12th Physics Overall Difficulty Level | Moderate to Difficult |
| Was the Paper Lengthy? | Yes |
| Number of Good Attempts | to be updated |
| Important Topics Asked | to be updated |
The Bihar Board Inter Physics Unofficial Answer Key 2026 is prepared by the subject-experts. Students are advised to use the above unofficial answer key to evaluate their performances. Unofficial answer keys are typically released by private coaching institutes and subject experts within a few hours of the exam's conclusion to help students estimate their scores.
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