Skip to content
← Physics

Physics · Class 12 Science

Bihar Bseb Class 12 Physics — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2018–2026
Years of papers
8
Total Papers
8
Real Board Papers
0
Sample papers
688
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

96 Q2026complete
96 Q2025complete
96 Q2024complete
96 Q2023complete
96 Q2022complete
96 Q2021complete
—2020Not available
59 Q2019complete
53 Q2018complete

Bihar Board Intermediate 2026 · Set A

Real board examination

About this paper

The real Class-12 board examination held in 2026. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks
70
Questions
48
Duration
195 min
Sections
3

The marks / questions / duration above are the official exam pattern. We currently have 96 of this paper’s questions (200% of the full paper), with 96 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
Section A (Objective, Q1–70)Section Section A (Objective, Q1–70)Objective (MCQ) — answer any 35 of 70, on OMR35135
Section B — Short AnswerSection Section B — Short AnswerShort answer — answer any 10 of 2010220
Section B — Long AnswerSection Section B — Long AnswerLong answer (internal choice) — answer any 3 of 63515
Total4870

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Physics

Bihar Board Intermediate 2026 · Set A

Series/Set: ARoll No. ________
Time Allowed: 3 hr 15 minMaximum Marks: 70

General Instructions

  1. This question paper contains 48 questions divided into 3 sections — Section A (Objective, Q1–70), Section B — Short Answer, Section B — Long Answer.
  2. Section Section A (Objective, Q1–70) comprises 35 questions of 1 mark each (Objective (MCQ) — answer any 35 of 70, on OMR).
  3. Section Section B — Short Answer comprises 10 questions of 2 marks each (Short answer — answer any 10 of 20).
  4. Section Section B — Long Answer comprises 3 questions of 5 marks each (Long answer (internal choice) — answer any 3 of 6).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

Q1.
The nuclear density is approximately (A) independent of mass number (B) directly proportional to mass number (C) inversely proportional to mass number (D) directly proportional to A^(1/3)
[1]
Q2.
In a transistor (A) concentration of impurities in the collector is minimum (B) concentration of impurities in the emitter is minimum (C) concentration of impurities in the base is minimum (D) concentrations of impurities in all the three regions are same
[1]
Q3.
Coulomb's law is valid for (A) Point charges only (B) Dispersed charges only (C) Both point charges and dispersed charges (D) Neutral particles
[1]
Q4.
S.I. unit of electric flux is (A) Vm (B) Vm^2 (C) Jm (D) NC^-1
[1]
Q5.
A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if (A) R = r/2 (B) R = r (C) R > r (D) R < r
[1]
Q6.
If L and R represent inductance and resistance respectively, then the unit of L/R will be (A) ohm (B) second (C) volt (D) ampere
[1]
Page 1 of 11
Q7.
In a metallic conductor, the current is carried by (A) free electrons (B) protons (C) free electrons and protons (D) bound electrons
[1]
Q8.
The dimensions of B0²/μ0 will be the same as that of (A) energy density (B) work (C) momentum (D) electric flux
[1]
Q9.
Nickel is (A) paramagnetic (B) diamagnetic (C) ferromagnetic (D) none of these
[1]
Q10.
In a half-wave rectifier, if the input frequency is 50 Hz, then output frequency will be (A) 25 Hz (B) 100 Hz (C) 0 Hz (D) 50 Hz
[1]
Q11.
How many joules of energy will be released due to mass defect of 1 mg? (A) 9 × 10⁶ J (B) 3 × 10⁸ J (C) 9 × 10¹0 J (D) 3 × 10² J
[1]
Q12.
The ratio of de Broglie wavelength associated with two electrons accelerated through 49 V and 64 V is (A) 49/64 (B) 64/49 (C) 7/8 (D) 8/7
[1]
Q13.
A ray of light is incident normally on a plane mirror. The angle of reflection will be (A) 90° (B) 0° (C) will not be reflected (D) none of these
[1]
Q14.
The phase difference φ is related to path difference λ by (A) (λ/π)φ (B) (π/λ)φ (C) (λ/2π)φ (D) (2π/λ)φ
[1]
Q15.
Who first explained electromagnetic waves mathematically? (A) Einstein (B) Faraday (C) Maxwell (D) Hertz
[1]
Q16.
Which factor of the following does not affect resistance of a conducting wire? (A) Length (B) Temperature (C) Material (D) Voltage applied
[1]
Q17.
When a dielectric is placed in an external electric field, the effective electric field inside the dielectric (A) Decreases (B) Increases (C) Becomes zero (D) Remains same
[1]
Page 2 of 11
Q18.
A capacitor of capacitance 1 μF is kept at 1 V potential difference between the plates. The charge on the charged capacitor will be (A) 1 C (B) zero (C) 1 μC (D) none of these
[1]
Q19.
If a charged particle of mass m and charge q enters a uniform magnetic field B at an angle θ in the direction of field with velocity v, then the path of the particle is helical. The radius of circular path of the helix will be (A) mv/qB (B) mv cosθ/qB (C) mv sinθ/qB (D) 2πmv/qB
[1]
Q20.
An ideal ammeter has (A) zero resistance (B) infinite resistance (C) high resistance (D) negative resistance
[1]
Q21.
Remote control for televisions uses (A) infrared waves (B) ultraviolet waves (C) radio waves (D) microwaves
[1]
Q22.
The surface charge densities on the surface of two conducting spheres of radii r1 and r2 are equal. The ratio of electric field intensities on the surfaces is (A) r1/r2 (B) r1²/r2² (C) r2²/r1² (D) 1 : 1
[1]
Q23.
Ohm's law does not apply, when (A) temperature changes (B) temperature is constant (C) potential difference changes (D) none of these
[1]
Q24.
An example of natural electromagnetic induction is (A) radio (B) television (C) battery charging (D) lightning strike
[1]
Q25.
Which quantity decreases in step-down transformer? (A) Current (B) Voltage (C) Frequency (D) Power
[1]
Q26.
The refractive index of water is 1.33. What will be the speed of light in water? (A) 1.33 × 10⁸ m/s (B) 4 × 10⁸ m/s (C) 2.25 × 10⁸ m/s (D) 3 × 10⁸ m/s
[1]
Q27.
The maximum kinetic energy of the photoelectrons varies (A) linearly with the frequency and the intensity of the incident radiation (B) linearly with the frequency and is independent of the intensity of the incident radiation (C) inversely with the frequency and is independent of the intensity of the incident radiation (D) inversely with the intensity and is independent of the frequency of the incident radiation
[1]
Page 3 of 11
Q28.
Which of the following are known as nucleons? (A) Only protons (B) Protons and electrons (C) Protons and neutrons (D) Neutrons and electrons
[1]
Q29.
'World Wide Web' was invented by (A) Tim Berner-Lee (B) John Logie Baird (C) Alexander Bain (D) G. Marconi
[1]
Q30.
Which of the following expressions represents electrical energy? (A) V.I.t (B) V.I (C) I.R².t (D) V²/R
[1]
Q31.
When an alpha-particle is brought towards another alpha-particle, the potential energy of the system (A) increases (B) decreases (C) remains unchanged (D) none of these
[1]
Q32.
Dielectric constant of water is (A) 80 (B) 1 (C) 0 (D) ∞
[1]
Q33.
The relationship between current density J, specific conductance σ and electric field intensity E is (A) E = σJ (B) E = σ/J (C) J = E/σ (D) J = σE
[1]
Q34.
The yellow colour code value of carbon resistance is (A) 4 (B) 2 (C) 3 (D) 5
[1]
Q35.
Relative permeability is equal to (A) μr = μ0·μ (B) μr = μ/μ0 (C) μr = μ0/μ (D) μr = √(μ·μ0)
[1]
Q36.
If a bar magnet is cut into two equal pieces transverse to its length, then each piece will (A) lose its magnetism (B) become a single pole (C) behave as a new magnet with a greater magnetic moment (D) behave as a new magnet with reduced magnetic moment
[1]
Q37.
In an ac circuit of capacitance the current from potential difference is (A) forward (B) backward (C) both are in same phase (D) none of these
[1]
Q38.
A capacitor is a perfect insulator for (A) alternating currents (B) direct currents (C) both (A) and (B) (D) none of these
[1]
Page 4 of 11
Q39.
The unit of displacement current is (A) Am (B) A (C) ΩA (D) ΩmA
[1]
Q40.
The solar spectrum is (A) continuous (B) line spectrum (C) spectrum of black lines (D) spectrum of black bands
[1]
Q41.
The field of view is maximum for (A) plane mirror (B) convex mirror (C) concave mirror (D) cylindrical mirror
[1]
Q42.
The ratio of the refractive index of red light to blue light in air is (A) less than unity (B) greater than unity (C) equal to unity (D) none of these
[1]
Q43.
The momentum (p) of photon is (A) λ/h (B) h/λ (C) hc/λ (D) hλ
[1]
Q44.
The radius of the lowest Bohr's orbit in hydrogen atom is r0. The radius of Bohr's second orbit is (A) r0 (B) 2r0 (C) 4r0 (D) r0/2
[1]
Q45.
If magnetic field is same but the area of the loop is increased, then the flux (A) increases (B) decreases (C) becomes zero (D) remains unchanged
[1]
Q46.
The voltage of domestic ac is 220 V. What does this represent? (A) Peak value voltage (B) Mean value voltage (C) Root mean voltage (D) Root mean square voltage
[1]
Q47.
The wavefront due to a point source at a finite distance from the source is (A) plane (B) circular (C) cylindrical (D) spherical
[1]
Q48.
For destructive interference, the path difference should be equal to (A) nλ (B) (2n+1)λ/2 (C) zero (D) infinity
[1]
Q49.
In an electric field with intensity E = 0, the change of potential V with distance r will be (A) V ∝ 1/r² (B) V ∝ 1/r (C) V ∝ r (D) V = constant and independent of r
[1]
Page 5 of 11
Q50.
The equivalent resistance of resistors in parallel combination (A) decreases (B) increases (C) remains same (D) none of these
[1]
Q51.
The magnetic field lines inside a current-carrying solenoid are (A) circular (B) diverging (C) parabola (D) parallel and straight
[1]
Q52.
Coherent sources are those sources for which (A) phase difference remains constant (B) amplitude remains constant (C) frequency remains constant (D) both phase difference and frequency remain constant
[1]
Q53.
Natural light from the sun is (A) polarised (B) unpolarised (C) partially polarised (D) linearly polarised
[1]
Q54.
Radioactivity was discovered by (A) Marie Curie (B) Pierre Curie (C) Ernest Rutherford (D) Henri Becquerel
[1]
Q55.
The example of a broadcast mode of communication is (A) radio (B) telephone (C) television (D) both (A) and (C)
[1]
Q56.
Which device is used as a voltage regulator? (A) Transistor (B) Transformer (C) Zener diode (D) Photodiode
[1]
Q57.
When an electric dipole p is placed in a uniform electric field E, then at what angle between p and E, the value of torque will be maximum? (A) 0° (B) 45° (C) 90° (D) 180°
[1]
Q58.
A circular loop radius R carries a current I. Its magnetic dipole moment is (A) IR² (B) IR (C) 2π IR (D) πIR²
[1]
Q59.
When the tube length of microscope is increased, its magnifying power (A) increases (B) decreases (C) becomes zero (D) remains unchanged
[1]
Q60.
Cathode rays are group of (A) electrons (B) protons (C) neutrons (D) none of these
[1]
Page 6 of 11
Q61.
When a soap bubble is charged, then its size (A) increases (B) decreases (C) remains unchanged (D) nothing can be said
[1]
Q62.
If the area of plates of a capacitor is halved, then the capacitance will (A) become double (B) become half (C) remain same (D) become four times
[1]
Q63.
Choke coil works on the principle of (A) self induction (B) transient current (C) mutual induction (D) wattless current
[1]
Q64.
To remove hypermetropia, lens used is (A) convex (B) concave (C) cylindrical (D) plano-convex
[1]
Q65.
Inverse square law of intensity of light, i.e., intensity ∝ 1/r² is applicable for (A) point source (B) linear source (C) cylindrical source (D) plane source
[1]
Q66.
The kinetic energy (K) of an electron in a Bohr orbit is related to its potential energy (U) by (A) K = U (B) K = -U (C) K = -U/2 (D) K = -2U
[1]
Q67.
Semiconductor is damaged by the strong current due to (A) lack of free electrons (B) excess of protons (C) excess of electrons (D) excess of neutrons
[1]
Q68.
The valency of impurity element to convert a germanium crystal into a p-type semiconductor is (A) 2 (B) 3 (C) 4 (D) 5
[1]
Q69.
In a communication system, a repeater is (A) a receiver (B) a transmitter (C) a combination of a receiver and transmitter (D) none of these
[1]
Q70.
The maximum velocity of an electron emitted from a metal surface becomes two times when the frequency v of the incident light is doubled. The work function of the metal is (A) 2hv/3 (B) hv/3 (C) zero (D) hv/2
[1]
Page 7 of 11
Section B

Q1.
The maximum and minimum amplitudes for an amplitude modulated wave are 12 V and 3 V respectively. Calculate the value of modulation index.
[2]
Q2.
Define current density.
[2]
Q3.
What is Malus's law?
[2]
Q4.
How are electromagnetic waves different from sound waves? Write any two differences.
[2]
Q5.
What is the use of a step-up transformer?
[2]
Q6.
What is wattless current?
[2]
Q7.
Define half-life. State the relation between half-life and decay constant.
[2]
Q8.
Write the unit and dimensional formula of permittivity of free space.
[2]
Page 8 of 11
Q9.
What will be the effect on resistance of a metallic conductor and a semiconductor on increasing the temperature? Explain with reasons.
[2]
Q10.
Explain sky waves and space waves.
[2]
Q11.
Write truth table and Boolean expression of OR and AND gates.
[2]
Q12.
What are donor and acceptor impurities?
[2]
Q13.
Define ionization energy. What is its value for hydrogen atom?
[2]
Q14.
What is the difference between magnification and magnifying power?
[2]
Q15.
What is spherical aberration?
[2]
Q16.
Write the expression for power factor of LCR circuit.
[2]
Q17.
What is Lorentz force?
[2]
Page 9 of 11
Q18.
Write any two characteristics of matter waves.
[2]
Q19.
Differentiate between primary and secondary rainbows.
[2]
Q20.
What are 'α' and 'β' parameters of transistor? What is their relation?
[2]
Section C

Q1.
Derive an expression for torque experienced by electric dipole placed in external electric field.
[5]
Q2.
Find the expression of the comparison of e.m.f.s of two cells by a potentiometer.
[5]
Q3.
Draw a ray diagram to show the refraction of light through glass prism. Derive the formula for the determination of refractive index of the material of the prism.
[5]
Page 10 of 11
Q4.
What are energy bands? How are these formed? Distinguish between conductors, semiconductors and insulators on the basis of formation of the energy bands.
[5]
Q5.
Mention the defects of human vision and describe the method to remove them.
[5]
Q6.
Derive an expression for the average value of alternating current.
[5]
Page 11 of 11