Bihar Board 12th Physics Mock Test 2027: Free online test, 35 objective questions and model paper practice
Executive Examination Summary
| Examination Features | Official BSEB Class 12 Specifications |
|---|---|
| Exam Name | Bihar School Examination Board (BSEB) Intermediate Annual Examination (I.Sc) |
| Subject | Physics (भौतिक विज्ञान) — Subject Code: 117 |
| Target Academic Session | 2026–2027 Examination Cycle (February 2027) |
| Total Marks | 100 Marks (70 Marks for the Theory Written Exam + 30 Marks for School Practical) |
| Exam Duration | 3 hours 15 minutes (195 minutes in total, including 15 minutes of cool-off reading time) |
| Question Paper Structure | Section A (Objective MCQs) + Section B (Subjective Short and Long Answer Questions) |
| Section A: Objective Questions | 70 multiple choice questions are provided; candidates must answer any 35 on the OMR sheet |
| Section A Marks | 35 Marks (1 Mark for each correct answer) |
| Negative Marking | None (0) — no marks are deducted for wrong answers |
| Section B: Short Answer Questions | 20 questions are given; candidates answer any 10 (2 Marks each = 20 Marks) |
| Section B: Long Answer Questions | 6 questions are given; candidates answer any 3 (5 Marks each = 15 Marks) |
| Passing Marks (Theory) | A minimum of 21 Marks out of 70 (according to the 30% passing rule) |
| Passing Marks (Practical) | A minimum of 12 Marks out of 30 (according to the 40% passing rule) |
| Minimum Aggregate to Pass | A total of at least 33 Marks out of 100 (combined Theory and Practical) |
| Medium of Examination | Bilingual (the questions are printed side by side in Hindi and English) |
Physics is generally regarded as the most difficult subject for Bihar Board Class 12 Science students. It involves conceptual definitions, mathematical derivations, ray diagrams, and numerical calculations.
A good performance in Physics can push your overall marks above 300, enabling you to secure a First Division. On the other hand, a poor score can drag down your entire rank, even if your marks in Chemistry and Hindi are high.
The Bihar Board Class 12 Physics paper provides students with a notable advantage: the ability to choose their questions. In Section A, the board offers 70 objective multiple-choice questions and you are only required to answer 35 of them on your OMR sheet.
This setup enables you to avoid difficult numerical problems and instead concentrate on straightforward questions regarding laws, SI units, and basic devices.
However, with 70 questions available, there is a significant challenge — the speed of question selection. Many students spend 40 minutes going through the entire paper, hesitate, second-guess their answers, and end up having to rush to fill in their OMR bubbles at the last minute.
Rushing results in careless errors. A student may solve question 15 correctly on paper but accidentally mark bubble number 16 on the OMR sheet.
By regularly practicing with our Bihar Board12th Physics mock test 2027, you train your mind to cope with this kind of pressure. You learn to quickly identify easy, direct-formula questions, select the best 35, and complete Section A in under 40 minutes.
Exam Pattern and Marking Scheme: Theory and Practical
The written theory paper and the internal school practical exam make up the BSEB Class 12 Physics examination (Subject Code 117), the total mark being 100.
| Section / Paper | Total Questions Given | Questions to Attempt | Total Marks | Evaluation & Negative Marking |
|---|---|---|---|---|
| Section-A (OMR multiple choice questions) | 70 questions | of which any 35 are to be attempted | carrying a total of 35 marks | at 1 mark each with no negative marking; only the first 35 answers bubbled will count. |
| Section-B (Short Answer) | 20 Questions | Any 10 Questions | 20 Marks | 2 marks each (Definitions, Laws, Short Reasons) |
| Section-B (Long Answer) | 6 Questions | Any 3 Questions | 15 Marks | 5 marks each (Derivations, Device Working & Principles) |
| Theory Total | 96 Questions | 48 Questions | 70 Marks | Passing Marks: Minimum 21 Marks (30%) |
| Practical Examination | Lab Experiments, Spotting & Viva | — | 30 Marks | Passing Marks: Minimum 12 Marks (40%) |
| Grand Total | — | — | 100 Marks | Aggregate Passing: Minimum 33 Marks |
Most Repeated SI Units & Formulas Quick Table
Questions involving SI units and dimensional formulas are included every year in the objective part, and by memorizing this table you can score 6 to 8 simple marks without having to carry out any complex calculations.
| Physical Quantity | Symbol | SI Unit | Dimensional Formula | Key Definition / Formula Context |
|---|---|---|---|---|
| Capacitance | C | Farad (F) | [M−1 L−2 T4 A2] | C = Q / V |
| Magnetic Flux | ΦB | Weber (Wb) or T⋅m2 | [ML2 T−2 A−1] | Φ = B⋅A⋅cosθ |
| Magnetic Field (B) | B | Tesla (T) or N/(A⋅m) | [ML0 T−2 A−1] | F = qvB |
| Self / Mutual Inductance | L or M | Henry (H) | [ML2 T−2 A−2] | e = −L (dI / dt) |
| Electric Flux | ΦE | N⋅m2/C or V⋅m | [ML3 T−3 A−1] | Φ = ∮ E⋅dA |
| Electric Potential | V | Volt (V) or J/C | [ML2 T−3 A−1] | V = W / Q |
| Electric Dipole Moment | p | Coulomb-meter (C⋅m) | [M0 LTA] | p = q × 2a |
| Resistivity (Specific Resistance) | ρ | Ohm-meter (Ω⋅m) | [ML3 T−3 A−2] | R = ρ (l / A) |
| Conductance | G | Siemens (S) or Ω−1 | [M−1 L−2 T3 A2] | G = 1 / R |
| Conductivity (Specific Conductance) | σ | S/m or Ω−1 m−1 | [M−1 L−3 T3 A2] | σ = 1 / ρ |
| Power of Lens | P | Dioptre (D) or m−1 | [M0 L−1 T0] | P = 1 / f (in meters) |
| Permittivity of Free Space | ε0 | C2/(N⋅m2) or F/m | [M−1 L−3 T4 A2] | Coulomb's Law constant |
Begin the Bihar Board Class 12 Physics mock test 2027 online
Begin the Bihar Board Class 12 Physics mock test 2027 online by taking an authentic 35-mark objective test based on the official BSEB guidelines. Make use of real-time scoring, derivation steps, and comparisons of your rank across the state.
- Free Access Tier: 2 full-length 70-question tests plus all 9 unit tests are available for free.
- OMR Simulation Rules: Select and submit your top 35 questions out of the 70.
- Languages Supported: Hindi Medium (हिंदी माध्यम) and English Medium.
- Features Included: Unit Accuracy Heatmap, Formula Helper, Step-by-Step Ray Diagrams.
Start Class 12 Physics Mock Test Online
Official Updates and Bihar Board Class 12 Examination Schedule
The Bihar School Examination Board (BSEB), which is headed by Chairman Anand Kishore at Sinha Library Road in Patna, conducts the annual Intermediate examinations. Below is the projected schedule for the 2027 batch:
| Examination Event | Expected Official Timeline | Current Verification Status | Official Verification Portal |
|---|---|---|---|
| Inter Science Student Registration | September – October 2026 | School Headmaster Filings | seniorsecondary.biharboardonline.com |
| Dummy Admit Card Verification | November 2026 | Name, photo, and subject corrections | BSEB Senior Secondary Portal |
| Sent-Up (Pre-Board) Practical Exams | Late November 2026 | Conducted at home schools | School Notice Boards |
| Sent-Up (Pre-Board) Theory Exams | Early December 2026 | Mandatory state-wide screening | High School Exam Centers |
| Official Model Papers (PDF Release) | Late December 2026 | Download of annual sample paper | biharboardonline.bihar.gov.in |
| Practical Examination Admit Card | Late December 2026 | Required for the home school lab tests | School Principal Login |
| Class 12 Practical Examinations | January 10 to January 20, 2027 | External examiner evaluation in the respective school labs | Respective School Labs |
| Final Theory Admit Card Release | Third week of January 2027 | Distributed with the official school seal at designated school counters | Designated School Counters |
| Class 12 Physics Theory Exam Date | Early February 2027 (First week) | As per the official BSEB Annual Routine | Official BSEB Press Release |
| BSEB Inter Annual Result 2027 | Late March 2027 (Before March 31) | On the Online Marksheet Portal | results.biharboardonline.com |
Educational Notice: The practice materials and test simulations offered on this platform are independently developed by teachers. This platform is completely separate from the Bihar School Examination Board (BSEB).
Explanation of the 70 vs 35 Objective Rule: Avoid This Important OMR Mistake
The most frequent mistake made by students in the Bihar Board Class 12 Physics exam is not understanding how the optical scanner grades Section A.
Section A of your paper has 70 objective questions numbered from 1 to 70. You are told to answer any 35 of them.
Many students wrongly believe that if they fill in 45 or 50 bubbles, the board will go through all of them and only count the top 35 scores.
This is entirely false.
The automated OMR scanner reads your answer sheet one question after another from top to bottom, starting at question 1. As soon as it has detected 35 marked bubbles, it stops evaluating.
Any bubbles marked after the 35th one are completely disregarded.
Consider this example:
- A student marks 45 bubbles on their OMR sheet.
- Among the first 35 marked bubbles, they have 23 correct and 12 incorrect.
- Questions 36 to 45 are all correct.
- The optical scanner records a final score of 23 out of 35 and never looks at questions 36 through 45.
That is why it is so valuable to practice on our bseb class 12 physics 70 objective questions model paper test free platform. Our system prevents you from marking a 36th question, thus helping you develop the habit of selecting only your best 35 questions.
What Most Free Online Tests Fail to Provide: Competitor Gap Analysis
There are many websites in Bihar that provide online quizzes for Class 12 Physics, but most of these have significant shortcomings. The table below shows what typical platforms overlook and how our platform offers a complete preparation experience:
| Feature / Preparation Need | What Most Free Websites Offer | How Our Testing Platform Solves It | Direct Benefit to You |
|---|---|---|---|
| OMR Exam Simulation | Short quizzes with only 10 to 15 questions | Full 70-question sets in which you choose your best 35 answers | Reproduces the actual exam room setting and the process of making decisions |
| OMR Evaluation Limit | Allows submission of an unlimited number of questions | Enforces a strict limit of 35 questions with immediate warnings | Prevents you from losing marks due to the optical scanner's cutoff rule |
| SI Units & Dimensions Cheat-Sheet | SI units and dimensions mixed in with random questions | A dedicated quick-revision module for SI units and dimensions | Helps you earn 6 to 8 easy marks that come up every year |
| Derivations & Ray Diagrams | Only text formulas without visual steps | Complete ray diagrams for telescopes, microscopes, and prism refraction | Prepares you for diagram-based questions in both Section A and B |
| Logic Gates & Truth Tables | Questions that are text-only and without diagrams | Interactive truth tables and circuit diagrams for OR, AND, NOT, NAND, NOR | Removes the confusion about binary inputs and Boolean algebra |
| Diagnostic Feedback | Only a basic percentage score is given at the end | Unit-wise accuracy heatmaps for all 9 units | Shows you exactly where your weaknesses lie so you know what to revise next |
| Bilingual Language Toggle | Often only in English or with poor Hindi translation | Clear, verified side-by-side translations in both Hindi and English | Enables Hindi and English medium students to practice with confidence |
Complete Unit-Wise Marks Distribution: All 9 NCERT Units
The BSEB Class 12 Physics syllabus follows the NCERT and SCERT Bihar curriculum, dividing the theory portion into 9 core units.
The table below outlines their question distribution and weightage across recent board papers:
| Physics Unit | NCERT Chapters Included | Estimated Objective Questions (Out of 70) | Estimated Subjective Marks (Out of 35) | Total Theory Marks Share (Out of 70) | Priority Level |
|---|---|---|---|---|---|
| Unit 6: Optics (प्रकाशिकी) | Chapters 9 and 10 | 14 – 16 Questions | 7 – 8 Marks | ~14 Marks | 🔥 Highest Priority |
| Unit 1: Electrostatics (स्थिर वैद्युतिकी) | Chapters 1 and 2 | 8 – 10 Questions | 4 – 5 Marks | ~8 Marks | High Priority |
| Unit 3: Magnetic Effects & Magnetism (चुंबकत्व) | Chapters 4 and 5 | 8 – 10 Questions | 4 – 5 Marks | ~8 Marks | High Priority |
| Unit 4: EMI & Alternating Currents (विद्युत चुंबकीय प्रेरण) | Chapters 6 and 7 | 8 – 10 Questions | 4 – 5 Marks | ~8 Marks | High Priority |
| Unit 2: Current Electricity (धारा विद्युत) | Chapter 3 | 7 – 9 Questions | 3 – 4 Marks | ~7 Marks | High Scoring |
| Unit 9: Electronic Devices / Semiconductors (इलेक्ट्रॉनिक्स) | Chapter 14 | 7 – 9 Questions | 3 – 4 Marks | ~7 Marks | Easy Scoring |
| Unit 8: Atoms & Nuclei (परमाणु तथा नाभिक) | Chapters 12 and 13 | 6 – 8 Questions | 3 – 4 Marks | ~6 Marks | Direct Formulas |
| Unit 7: Dual Nature of Matter (विकिरण तथा द्रव्य) | Chapter 11 | 4 – 6 Questions | 2 – 3 Marks | ~4 Marks | Direct Theory |
| Unit 5: Electromagnetic Waves (विद्युत चुंबकीय तरंगें) | Chapter 8 | 3 – 4 Questions | 1 – 2 Marks | ~3 Marks | Quick Memory |
Detailed Micro-Syllabus Breakdown: Unit by Unit
Review this micro-syllabus to master every chapter, concept, law, and formula across the 9 units of Physics:
Unit 1: Electrostatics (स्थिर वैद्युतिकी)
Estimated Theory Weightage: 8 to 10 Objective Questions, ~8 Total Marks
Chapter 1: Electric Charges and Fields (वैद्युत आवेश तथा क्षेत्र):
Micro-Topics: Electric charge properties, Quantization of charge (q = ±ne), Conservation of charge, Coulomb's Law in scalar and vector form, Principle of Superposition.
Electric Field & Dipole: Electric field lines and their properties, Electric dipole and dipole moment (p = q × 2a), Torque on a dipole in a uniform electric field (τ = pE sinθ), Work done in rotating a dipole (W = pE(1 − cosθ)).
Gauss's Theorem & Applications: Electric flux (Φ = ∮ E⋅dA), Gauss's Law statement and proof.
Applications of Gauss's Law: Field due to infinitely long straight wire (E = λ / (2πε0 r)), Field due to uniformly charged infinite plane sheet (E = σ / (2ε0)), Field due to thin spherical shell (inside E = 0, outside E = q / (4πε0 r2)).
Chapter 2: Electrostatic Potential and Capacitance (स्थिर वैद्युत विभव तथा धारिता):
Micro-Topics: Electric potential due to point charge (V = q / (4πε0 r)), Potential due to electric dipole (axial vs equatorial where V = 0), Equipotential surfaces and their properties (work done moving a charge along an equipotential surface is zero).
Capacitors: Capacitance concept (C = Q / V), Parallel plate capacitor with dielectric medium (C = Kε0 A / d), Combination of capacitors (Series: 1/Cs = 1/C1 + 1/C2, Parallel: Cp = C1 + C2), Energy stored in a capacitor (U = (1/2)CV2 = Q2/(2C) = (1/2)QV), Loss of energy on sharing charges.
Unit 2: Current Electricity (धारा विद्युत)
Estimated Theory Weightage: 7 to 9 Objective Questions, ~7 Total Marks
Chapter 3: Current Electricity (विद्युत धारा):
Micro-Topics: Electric current, Current density (J = I / A), Drift velocity (vd = eEτ / m), Relation between current and drift velocity (I = neAvd), Mobility (μ = vd / E).
Ohm's Law & Resistance: Ohm's Law derivation, Electrical resistance, Factors affecting resistance, Resistivity (ρ), Temperature dependence of resistance (Rt = R0(1 + αt)), Carbon resistors and color coding sequence (BBROYGBVGW).
Circuits & Instruments: Electromotive force (EMF) vs Terminal Potential Difference, Internal resistance of a cell (r = R(E/V − 1)), Cells in series and parallel combinations.
Kirchhoff's Laws & Measuring Devices: Kirchhoff's First Law (Junction rule - conservation of charge), Kirchhoff's Second Law (Loop rule - conservation of energy), Wheatstone Bridge balance condition (P / Q = R / S), Meter Bridge principle, Potentiometer principle and applications (comparing EMFs of two cells, finding internal resistance).
Unit 3: Magnetic Effects of Current & Magnetism (धारा के चुंबकीय प्रभाव तथा चुंबकत्व)
Estimated Theory Weightage: 8 to 10 Objective Questions, ~8 Total Marks
Chapter 4: Moving Charges and Magnetism (गतिमान आवेश और चुंबकत्व):
Micro-Topics: Oersted's experiment, Biot-Savart Law (dB = (μ0/4π) (I dl sinθ / r2)), Magnetic field on the axis of a circular current loop (B = μ0 I R2 / [2(R2 + x2)3/2]), Ampere's Circuital Law and its application to an infinitely long straight wire and solenoid (B = μ0 n I).
Forces & Devices: Lorentz magnetic force (F = q(v × B)), Force on a current-carrying conductor in a magnetic field (F = I(l × B)), Force between two parallel current-carrying conductors (definition of 1 Ampere: F/l = (μ0 I1 I2) / (2π d)), Torque on a rectangular current loop (τ = NIAB sinθ), Moving Coil Galvanometer (principle, construction, current sensitivity, voltage sensitivity), Conversion of Galvanometer into Ammeter (using low shunt resistance in parallel) and Voltmeter (using high resistance in series).
Chapter 5: Magnetism and Matter (चुंबकत्व एवं द्रव्य):
Micro-Topics: Bar magnet as an equivalent solenoid, Magnetic field lines properties, Magnetic dipole moment (M = m × 2l), Torque on magnetic dipole (τ = M × B).
Earth's Magnetism: Elements of Earth's magnetic field: Magnetic Declination, Angle of Dip (Inclination - 0° at equator, 90° at poles), Horizontal component of Earth's field (BH = B cosθ).
Magnetic Materials: Diamagnetic, Paramagnetic, and Ferromagnetic substances (comparison of permeability μr and susceptibility χm), Curie's Law (χ ∝ 1/T), Electromagnets vs Permanent magnets.
Unit 4: Electromagnetic Induction & Alternating Currents (विद्युत चुंबकीय प्रेरण एवं प्रत्यावर्ती धारा)
Estimated Theory Weightage: 8 to 10 Objective Questions, ~8 Total Marks
Chapter 6: Electromagnetic Induction (विद्युत चुंबकीय प्रेरण):
Micro-Topics: Magnetic flux (Φ=B⋅A), Faraday's Laws of Induction (e = −N (dΦ / dt)), Lenz's Law (this being based on the principle of conservation of energy), motional electromotive force (e = Blv).
Inductance & Currents: Eddy currents and their uses (deadbeat galvanometer, induction furnace, magnetic brakes), Self-inductance (L = NΦ / I, for long solenoid L = μ0 n2 Al), Mutual inductance (M = N2 Φ2 / I1), Energy stored in an inductor (U = (1/2)LI2).
Chapter 7: Alternating Current (प्रत्यावर्ती धारा):
Micro-Topics: Alternating voltage and current representations, Peak value vs Root Mean Square (RMS) value (Irms = I0 / √2 ≈ 0.707 I0, Vrms = V0 / √2), Average value of AC over half cycle (Iavg = 2I0 / π ≈ 0.637 I0).
AC Circuits: AC circuit containing pure Resistor (R), pure Inductor (L - current lags voltage by π/2, Inductive reactance XL = ωL = 2πfL), pure Capacitor (C - current leads voltage by π/2, Capacitive reactance XC = 1/(ωC) = 1/(2πfC)).
LCR Series Circuit: Impedance formula (Z = √[R2 + (XL − XC)2]), Resonance condition (XL = XC, Resonant frequency fr = 1 / (2π√[LC])), Power in AC circuits (P = Vrms Irms cosϕ). The power factor, denoted by cosϕ, is referred to as wattless current in the case where cosϕ equals zero in a pure inductance or capacitance.
AC Devices: AC Generator principle and working, Transformer (Step-up and Step-down, Transformation ratio K = Ns / Np = Vs / Vp = Ip / Is). The energy losses in a transformer include copper loss, iron loss, hysteresis loss and humming loss.
Unit 5: Electromagnetic Waves (विद्युत चुंबकीय तरंगें)
Estimated Theory Weightage: 3 to 4 Objective Questions, ~3 Total Marks
Chapter 8: Electromagnetic Waves (वैद्युत चुंबकीय तरंगें):
Micro-Topics: Need for displacement current (Id = ε0 (dΦE / dt)), Maxwell's equations summary, Characteristics and transverse nature of EM waves (E and B are perpendicular to each other and to the direction of propagation, c = 1 / √(μ0 ε0) = E0 / B0).
The electromagnetic spectrum includes the various frequency and wavelength ranges, with the different types of waves in the following order: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays; key applications comprise the use of microwaves in RADAR, infrared radiation in remote controls, UV rays for the purification of water, and X-rays for imaging bones.
Unit 6: Optics (प्रकाशिकी) — Highest Scoring Unit
Estimated Theory Weightage: 14 to 16 Objective Questions, ~14 Total Marks
Chapter 9: Ray Optics and Optical Instruments (किरण प्रकाशिकी एवं प्रकाशिक यंत्र):
Micro-Topics: Reflection at spherical mirrors, Mirror formula (1/f = 1/v + 1/u), Refraction at plane surfaces, Snell's Law (sin i / sin r = μ2 / μ1), Real and apparent depth (d' = d / μ).
Total Internal Reflection (TIR): Critical angle formula (sin C = 1 / μ) — Applications of TIR: the formation of a mirage, the brilliance of diamonds, the principle of optical fibres.
Lenses & Prisms: Refraction at spherical surfaces, Lens Maker's Formula (1/f = (μ − 1)(1/R1 − 1/R2)), Thin lens formula (1/f = 1/v − 1/u), Power of lens (P = 1/f), Combination of thin lenses in contact (1/F = 1/f1 + 1/f2, P = P1 + P2), Refraction through a prism (μ = sin[(A + δm)/2] / sin(A/2)). The dispersion of light by a prism.
Optical Instruments: Simple Microscope magnification (m = 1 + D/f), Compound Microscope construction, ray diagram, and magnifying power (m = −(vo/uo)(1 + D/fe)), Astronomical Telescope (Normal adjustment m = −fo / fe, length of tube L = fo + fe).
Chapter 10: Wave Optics (तरंग प्रकाशिकी):
The topic of micro-waves includes their definition and the different types such as spherical, cylindrical and plane wavefronts, as well as Huygens' Principle and its use in verifying the laws of reflection and refraction.
Interference of Light: Coherent sources, Young's Double Slit Experiment (YDSE), Conditions for constructive interference (Path difference Δx = nλ) and destructive interference (Δx = (2n − 1)(λ/2)), Fringe width formula (β = λD / d).
Diffraction & Polarization: Diffraction of light at a single slit (central maximum width 2β0 = 2λD / a), Distinction between interference and diffraction, Polarization of light, Brewster's Law (μ = tan ip), Malus's Law (I = I0 cos2θ), Polaroid uses.
Unit 7: Dual Nature of Radiation and Matter (विकिरण तथा द्रव्य की द्वैत प्रकृति)
Estimated Theory Weightage: 4 to 6 Objective Questions, ~4 Total Marks
Chapter 11: Dual Nature of Radiation and Matter (विकिरण तथा द्रव्य की द्वैत प्रकृति):
Micro-Topics: thermionic emission, photoelectric emission, and field emission; the experimental observations of the photoelectric effect made by Hertz, Hallwachs, and Lenard.
Photoelectric Principles: Threshold frequency (ν0), Threshold wavelength (λ0), Stopping potential (V0), Effect of intensity and frequency on photoelectric current and stopping potential (eV0 = Kmax).
Einstein's Equation: Photon concept (E = hν, momentum p = h/λ), Einstein's Photoelectric Equation (Kmax = hν − ϕ0 = h(ν − ν0)).
Matter Waves: de Broglie hypothesis, de Broglie wavelength formula (λ = h/p = h/(mv) = h / √(2mE)), for an electron accelerated through potential V (λ = 12.27 / √V Å).
Unit 8: Atoms and Nuclei (परमाणु तथा नाभिक)
Estimated Theory Weightage: 6 to 8 Objective Questions, ~6 Total Marks
Chapter 12: Atoms (परमाणु):
Micro-Topics: the Geiger-Marsden experiment involving alpha particles, Rutherford's nuclear model of the atom and its limitations, and Bohr's postulates regarding the hydrogen atom.
Bohr's Formulations: Radius of n-th orbit (rn = (n2 h2 ε0) / (π m e2) ∝ n2, for n=1, r1 = 0.529 Å), electron velocity (vn ∝ 1/n), Energy of electron in n-th orbit (En = −13.6 / n2 eV).
Hydrogen Spectrum Series: Spectral lines formula (1/λ = R(1/n12 − 1/n22)):
- Lyman series (n1=1, n2=2,3,… in Ultraviolet region)
- Balmer series (n1=2, n2=3,4,… in Visible region)
- Paschen series (n1=3, n2=4,5,… in Infrared region)
- Brackett series (n1=4, n2=5,6,… in Infrared region)
- Pfund series (n1=5, n2=6,7,… in Infrared region)
Chapter 13: Nuclei (नाभिक):
Micro-Topics: the atomic mass unit (1 amu = 931.5 MeV), the composition and size of the nucleus (R = R0 A1/3, where R0 ≈ 1.2 × 10−15 m). The nuclear density does not depend on the mass number A.
Mass & Energy: Mass defect (Δm = [Z mp + (A − Z)mn] − M), Binding energy (BE = Δm⋅c2). The curve of binding energy per nucleon, the characteristics of nuclear forces (the strongest of the forces, short range, independent of charge, and saturated).
Nuclear Reactions: Nuclear fission (splitting of heavy nucleus like 235U), Nuclear fusion combines light nuclei like hydrogen in the Sun's core.
| Permeability of Free Space | μ0 | T⋅m/A or H/m | [MLT−2 A−2] | Biot-Savart Law constant |
| Planck's Constant | h | Joule-second (J⋅s) | [ML2 T−1] | E = hν |
| Rydberg Constant | R | m−1 | [M0 L−1 T0] | Spectral series constant |
Unit 9: Electronic Devices / Semiconductor Electronics (इलेक्ट्रॉनिक युक्तियाँ)
Estimated Theory Weightage: 7 to 9 Objective Questions, ~7 Total Marks
Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits (अर्धचालक इलेक्ट्रॉनिकी):
Micro-Topics: Energy bands in solids (Valence band, Conduction band, Energy band gap Eg), Classification of Conductors (Eg=0), Insulators (Eg>3 eV), and Semiconductors (Eg<3 eV, for Silicon Eg=1.1 eV, for Germanium Eg=0.7 eV).
Semiconductor Types: Intrinsic semiconductors (ne = nh = ni), Extrinsic semiconductors:
n-type semiconductor (doped with pentavalent impurity: P, As, Sb; electrons are majority carriers ne ≫ nh)
p-type semiconductor (doped with trivalent impurity: B, Al, In; holes are majority carriers nh ≫ ne)
p-n Junction Diode: Formation of depletion layer and potential barrier (0.7 V for Si, 0.3 V for Ge), Forward biasing (depletion layer narrows, resistance decreases), Reverse biasing (depletion layer widens, high resistance).
Diode Applications: p-n Junction diode as a Rectifier:
Half-wave rectifier (one diode, efficiency ≈40.6%)
Full-wave rectifier (two diodes or bridge, efficiency ≈81.2%)
Logic Gates, Truth Tables & Boolean Expressions Reference
Logic gate questions appear every single year in BSEB Physics objective papers. Memorizing these five gates guarantees 3 to 4 easy marks:
| Gate Name | Standard Circuit Symbol Description | Boolean Algebra Expression | Truth Table Inputs & Output | Practical Working Rule |
|---|---|---|---|---|
| OR Gate | Curved input with pointed output | Y = A + B | A=0, B=0 → Y=0 A=1, B=0 → Y=1 A=0, B=1 → Y=1 A=1, B=1 → Y=1 |
Output is 1 if ANY input is 1. Output is 0 only when all inputs are 0. |
| AND Gate | Straight flat input with rounded D-shape output | Y = A ⋅ B | A=0, B=0 → Y=0 A=1, B=0 → Y=0 A=0, B=1 → Y=0 A=1, B=1 → Y=1 |
Output is 1 ONLY when BOTH inputs are 1. |
| NOT Gate | Triangle with a small inversion bubble at tip | Y = Ā | A=0 → Y=1 A=1 → Y=0 |
Inverter. Output is the opposite of the input. |
| NAND Gate | AND gate with an inversion circle at output | Y = A ⋅ B | A=0, B=0 → Y=1 A=1, B=0 → Y=1 A=0, B=1 → Y=1 A=1, B=1 → Y=0 |
Universal Gate. Inverted AND. Output is 0 only when both inputs are 1. |
| NOR Gate | OR gate with an inversion circle at output | Y = A + B | A=0, B=0 → Y=1 A=1, B=0 → Y=0 A=0, B=1 → Y=0 A=1, B=1 → Y=0 |
Universal Gate. Inverted OR. Output is 1 only when both inputs are 0. |
Important Derivations & Ray Diagrams Checklist (Section B Preparation)
To score high in Section B (2-mark short answers and 5-mark long answers), practice these specific derivations and ray diagrams on paper:
Derivation 1: Lens Maker's Formula:
Refraction at two spherical surfaces yielding:
Derivation 2: Young's Double Slit Experiment (YDSE):
Finding optical path difference Δx = xd / D and deriving the fringe width formula:
Derivation 3: Prism Formula:
Tracing a ray through a glass prism and establishing the refractive index relation:
Derivation 4: Electric Field using Gauss's Law:
Deriving E for an infinitely long straight charged wire (E = λ / (2πε0 r)) or an infinite thin charged sheet (E = σ / (2ε0)).
Derivation 5: Mutual Inductance of Two Coaxial Solenoids:
Calculating magnetic flux linkage and establishing:
Derivation 6: LCR Series Resonant Circuit:
Using phasor diagrams to derive impedance Z = √[R2 + (XL − XC)2] and finding resonant frequency:
Ray Diagram 1: Compound Microscope:
Neat diagram showing the small focal length objective lens forming a real, inverted image, and the eyepiece acting as a simple magnifier to form an enlarged virtual final image at the near point D.
Ray Diagram 2: Astronomical Telescope (Refracting):
Ray diagram in normal adjustment (final image at infinity) showing parallel incident rays, intermediate real image at the common focal plane, and parallel rays emerging from the eyepiece.
Device Working: Transformer Principle & Losses:
Diagram of laminated soft iron core, primary and secondary coils, mutual induction principle, and explanation of step-up versus step-down voltage ratios.
Previous Year Question (PYQ) Trend Analysis
An analysis of recent BSEB Intermediate Physics exam papers highlights clear question distribution patterns:
Plaintext
| Question Style Category | Share in 70 Objectives | What the Questions Test | Recommended Student Approach |
|---|---|---|---|
| Direct Recall, Laws & SI Units | 35 Questions | Units of inductance, power of lens, Brewster's law, diode bias conditions, definitions. | Attempt these first. These 35 questions can be answered within 20 minutes without rough calculations. |
| Direct Single-Formula Calculations | 20 Questions | Half-life values, de Broglie wavelength, equivalent resistance, transformer turn ratios. | Solve these if you need extra questions to reach your target of 35. |
| Multi-Step Circuit Puzzles | 15 Questions | Complex Kirchhoff loops, multi-lens focal lengths, intricate Bohr orbital deductions. | Skip these in Section A. Because you only need 35 answers out of 70, prioritize direct, single-step questions. |
How many objective questions are asked in Bihar Board 12th Physics?
A total of 70 objective MCQs are given in Section-A. Candidates must answer any 35 questions on the OMR sheet. Each question carries 1 mark, making Section-A worth 35 marks.
What are the passing marks in Bihar Board 12th Physics?
To pass Bihar Board Class 12 Physics, a student must secure at least 21 marks out of 70 in theory (30%) and at least 12 marks out of 30 in practical (40%), with an aggregate of at least 33 out of 100 to pass.
Is there negative marking in BSEB Class 12 Physics exam?
No, there is zero negative marking. Students receive 1 mark for each correct bubble, with no penalty for wrong or unattempted questions. Students should answer all 35 allowed objective questions without leaving any blank.
Which chapter carries the highest marks in Bihar Board 12th Physics?
Unit 6, Optics, carries the highest weightage of 14 marks, followed by Semiconductor Electronics, Electrostatics, and Electromagnetic Induction & AC at 8 marks each.
What happens if a candidate attempts more than 35 objective questions?
The automated computer scanner only assesses the first 35 bubbled responses in serial order. Any questions answered from 36 to 70 are entirely ignored, even if they are answered correctly.
Built-in Platform Features & AI-Based Weak Area Diagnostics
Our practice portal on sarkarimocktest.com provides real-time diagnostic tools built for Bihar Board students:
- Unit-Wise Accuracy Analytics: Review your performance across Electrostatics, Current Electricity, Magnetism, Optics, and Semiconductors independently. Identify whether your errors come from formula slips or unit confusions.
- Time-Per-Question Diagnostics: Track the average seconds spent per question. The system flags any question taking over 60 seconds so you can practice solving it faster.
- All India Rank & State Percentile: Benchmark your score against Intermediate Science candidates across all 38 districts of Bihar, from Patna and Gaya to Bhagalpur and Muzaffarpur.
- Adaptive Test Difficulty: As your accuracy rises, the system serves you more application-level numericals and circuit problems to build confidence for Section B subjective questions.
- Step-by-Step Derivation Explanations: Every question includes a full solution showing the complete mathematical steps, circuit diagrams, and applicable physical laws.
- Topper Comparison Sheet: Review how top scorers scoring 95+ marks selected their 35 objective questions and paced their exam.
- Gamification & Daily Study Streaks: Earn badges and complete daily 20-minute goals to stay focused throughout your preparation.
AI-Based Weak Area Recommendation
Taking practice tests without reviewing your mistakes leads to repeated errors. Our platform features an AI-driven diagnostics engine that works like a private tutor.
Here is how the analysis works:
- You complete a 70-question practice test and mark your 35 answers.
- The engine evaluates your correct, incorrect, and skipped questions.
- If you score 100% in Electrostatics and Current Electricity but miss questions on Brewster's Law or Lens Combinations, the system highlights Optics in red on your personal dashboard.
- The system provides an automated suggestion: "You missed 3 questions on calculating the focal length of lenses in contact. Review Chapter 9 optical formulas and complete our 10-question Ray Optics drill before taking your next full test."
Plaintext
Caption: AI-based student dashboard displaying unit-wise accuracy heatmaps, time-per-question analytics, and personalized revision recommendations for BSEB Class 12 Physics.
15 Common Mistakes Aspirants Make in Bihar Board Class 12th Physics
Avoid these common preparation errors to protect your score:
- Attempting More Than 35 Objectives: Marking 45 or 50 bubbles on the OMR sheet wastes time. The scanner only evaluates the first 35 bubbles marked from top to bottom.
- Confusing Units of Inductance and Magnetic Flux: Mixing up Henry (H) for inductance with Weber (Wb) for magnetic flux.
- Overlooking the Theory Passing Mark: Forgetting that theory and practical components must be passed separately. You must score at least 21 marks in theory, regardless of your practical score.
- Neglecting the Lens Maker's Formula Sign Convention: Forgetting that for a biconvex lens, R1 is positive and R2 is negative, which leads to incorrect focal length calculations.
- Forgetting Power of Lens Units: Calculating lens power using focal length in centimeters without converting it to meters (P=100/f in cm).
- Confusing NAND and NOR Truth Tables: Mixing up the inverted outputs of universal logic gates under identical binary inputs.
- Rushing OMR Bubbling: Solving questions accurately on paper but accidentally filling the wrong bubble row on the OMR sheet.
- Neglecting the Negative Sign in Lenz's Law: Writing e = N (dΦ / dt) instead of the correct form: e = −N (dΦ / dt).
- Studying Without a Stopwatch: Solving practice sets without a timer, which leads to poor time management during the real exam.
- Skipping Ray Diagrams in Section B: Writing long theoretical explanations for telescopes or microscopes without drawing clean, labeled ray diagrams with arrowheads.
- Disregarding Semiconductor Energy Gaps: Forgetting the band gap values for Silicon (1.1 eV) and Germanium (0.7 eV).
- Mixing Up Hydrogen Spectral Series: Forgetting that the Lyman series lies in the Ultraviolet region, the Balmer series lies in the Visible region, and the Paschen series lies in the Infrared region.
- Neglecting Shunt Resistance Formulas: Mixing up the formulas for converting a galvanometer into an ammeter (shunt in parallel) versus a voltmeter (multiplier in series).
- Over-Calculating in Section A: Spending 3 minutes on a complicated numerical question when simple, direct formula questions are available.
- Leaving Blank Bubbles: Since there is zero negative marking, leaving any of your 35 objective choices unattempted is a missed opportunity.
Preparation Strategy: Theory Objectives, Subjective Steps & Practical Labs
To score 90+ marks in Physics, you must prepare for all three components together:
Preparation Phase
Focus Component
Daily Action Plan
Practice solving 35 objective questions daily in 30 minutes. Focus on direct formula recognition, SI units, and logic gate truth tables.
Practice writing two-mark answers with clear statements of physical laws. Practice five-mark derivations with neat, labeled ray diagrams.
Maintain a clean practical record notebook. Practice using meters, measuring resistances using a meter bridge, and finding the focal length of a convex lens.
Complete at least five full-length model papers. Allocate 40 minutes for Section A (OMR), 75 minutes for short answers, and 60 minutes for long answers, leaving 20 minutes to review.
Recommended Reference Books & Study Materials
Stick to proven study resources:
| Resource Title | Publisher / Source | How to Use It |
|---|---|---|
| NCERT Physics Class 12 (Part 1 & Part 2) | NCERT / BSTBPC Bihar | Your core textbook. Read every line, study summary boxes, and solve all in-text examples and exercise problems. |
| BSEB Official Model Question Papers | Bihar School Examination Board | Practice the latest official model papers to familiarize yourself with the question style and layout. |
| Target / Alok / Golden BSEB Question Bank | Reputed Bihar Publishers | Review chapter-wise solved objective and subjective questions from the past 10 years (2015 to 2026). |
| MockTestCenter.com Practice Series | MockTestCenter / Sarkarimocktest | Timed chapter-wise drills and full 70-question OMR simulations with instant accuracy feedback. |
Eligibility Criteria: Who Can Appear for BSEB Inter Science Physics?
Candidates must meet the standard Bihar School Examination Board enrollment criteria:
| Eligibility Factor | Official Requirement | Key Details |
|---|---|---|
| Academic Stream | Intermediate of Science (I.Sc) | Must be enrolled in Class 12 with Physics as a compulsory subject (PCM or PCB group). |
| School Affiliation | Recognized Higher Secondary School / College | Enrolled through an institution affiliated with the Bihar School Examination Board. |
| Pre-Board (Sent-Up) Exam | Mandatory Passing Requirement | Must appear for and clear the school's Sent-Up theory and practical examinations in November. |
| Minimum Class Attendance | 75% Attendance Requirement | Regular students must satisfy the board's minimum attendance policy during the academic year. |
| Registration Record | Valid BSEB Registration Number | Must possess an official registration card and roll code issued by BSEB. |
Bihar Board Class 12th Physics 2027 Important Dates
Stay organized by tracking the key milestones for the 2027 examination cycle:
| Examination Milestone | Expected Timeline | Official Status |
|---|---|---|
| Examination Form Submission | September to October 2026 | Handled through school headmasters |
| Dummy Admit Card Verification | November 2026 | Review spelling of student and parent names |
| Sent-Up (Pre-Board) Exams | Late November to Early December 2026 | Mandatory internal screening tests |
| Practical Examination Admit Card | Late December 2026 | Required for entry to home school lab exams |
| Inter Physics Practical Exams | January 10 to January 20, 2027 | External evaluation at home school |
| Final Theory Admit Card Release | Third Week of January 2027 | Signed and stamped by the school principal |
| Class 12 Physics Theory Exam Date | Early February 2027 (First Week) | State-wide theory exam at designated centers |
| Official Objective Answer Key Release | Late February / Early March 2027 | Available for objection filing on the BSEB portal |
| Inter Science Annual Result Declaration | Late March 2027 (Before March 31) | Online marksheet published on official portals |
Free vs Paid Mock Test: What You Get
We believe foundational practice should be accessible to all students across Bihar. Here is how our free tier compares to the full test package:
| Feature Component | Free Access Tier | Pro Test Package |
|---|---|---|
| Full-Length 70-Question Tests | 2 Full Tests Free | 15 Complete BSEB Simulation Papers |
| Chapter-Wise Objective Tests | All 14 Chapters Included | All 14 Chapters with Advanced Question Pools |
| Bilingual Language Toggle | Included for All Questions | Included for All Questions |
| Derivation Steps & Ray Diagrams | Detailed Text Solutions | Detailed Ray Diagrams & Formula Steps |
| Offline Printable PDFs | Sample Model Paper PDF Included | All 15 Full Mocks Available as PDFs with Solutions |
| AI Weak Area Heatmap | Basic Overview | Comprehensive Unit-Wise Heatmap & Custom Drills |
| All India Rank & State Percentile | Included on Free Tests | Detailed Cohort Analysis & District Rankings |
Daily Current Affairs & General Knowledge Quiz
While preparing for your board exams, staying informed about major state and national developments helps build foundational general knowledge for upcoming competitive exams like JEE, NEET, NDA, CUET, or Air Force technical entries.
How to Apply: Bihar Board Class 12 Inter Science 2027 Exam Form Process
The application process is managed through your school or junior college:
- Obtain the Examination Form: Collect the official BSEB Intermediate Science examination form from your school clerk or principal.
- Fill in Personal Details: Enter your name, father's name, mother's name, date of birth, and Aadhaar number exactly as they appear on your BSEB Registration Slip.
- Select Your Subject Combination: Ensure Physics (Subject Code 117) is selected alongside Chemistry, Mathematics/Biology, Hindi, and English.
- Attach Required Documents: Attach two recent passport-sized color photographs, a photocopy of your matriculation certificate, and a photocopy of your Class 11 registration slip.
- Pay the Examination Fee: Pay the board examination fee (fees vary slightly for regular, private, and reserved categories).
- Institutional Verification & Upload: Your school headmaster verifies the details and submits your form online through seniorsecondary.biharboardonline.com.
- Verify the Dummy Admit Card: When the board releases the dummy admit card in November, verify your subject codes and personal details. Report any errors to your school immediately for correction.
Your Next Step to Score 35/35 in Physics Objectives
Follow this practical daily study plan:
- Look over the micro-syllabus listed above and begin with the Optics and Semiconductor chapters that are most worthwhile.
- Take fifteen minutes to go over our quick table of the most frequently repeated SI Units & Formulas.
- Get your first free practice test which consists of 70 questions on our platform.
- To develop a good sense of pacing and to prevent being penalized for reaching the OMR cutoff, practice choosing and responding to exactly 35 questions.
- Look over your scorecard, examine your unit accuracy heatmap, and read the step-by-step solutions for any questions that you got wrong.