Physics · Class 12 Science

West Bengal Wbchse 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.

2016–2026
Years of papers: 8
Total Papers: 8
Real Board Papers: 0
Sample papers: 251
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

59 Q20262 sets

35 Q2025complete

35 Q2024complete

35 Q2023complete

35 Q2022complete

—2021Not available

—2020Not available

17 Q2019complete

—2018Not available

—2017Not available

35 Q2016complete

West Bengal HS (WBCHSE) Board 2026 · Set SEM3

Real board examination

Sets

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: 35
Duration: 195 min
Sections: 5

The marks / questions / duration above are the official exam pattern. We currently have 35 of this paper’s questions (100% of the full paper), with 35 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
ISection I	compulsory	14	1	14
II-ASection II-A	compulsory	4	1	4
II-BSection II-B	compulsory	5	2	10
II-CSection II-C	compulsory	9	3	27
II-DSection II-D	compulsory	3	5	15
Total		35		70

The question paper

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

Board Examination

Physics

West Bengal HS (WBCHSE) Board 2026 · Set SEM3

Series/Set: SEM3Roll No. ________

Time Allowed: 3 hr 15 minMaximum Marks: 70

General Instructions

This question paper contains 35 questions divided into 5 sections — I, II-A, II-B, II-C, II-D.
Section I comprises 14 questions of 1 mark each (compulsory).
Section II-A comprises 4 questions of 1 mark each (compulsory).
Section II-B comprises 5 questions of 2 marks each (compulsory).
Section II-C comprises 9 questions of 3 marks each (compulsory).
Section II-D comprises 3 questions of 5 marks each (compulsory).

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

Section A

Q1.

The velocity of electromagnetic radiation in a medium of permittivity ε₀/2 and permeability 2μ₀ is given by

(a) 2√(ε₀/μ₀)
(b) 2√(μ₀ε₀)
(c) 1/√(μ₀ε₀)
(d) (1/2)√(μ₀/ε₀)

[1]

Q2.

Match Column-I with Column-II and select the correct option : Column-I (Name of Electromagnetic wave):

(i) Infrared waves;
(ii) Microwaves;
(iii) X-ray;
(iv) Radio wave. Column-II (Value of wavelength):
(a) 10⁻² m;
(b) 10³ m;
(c) 10⁻⁷ m;
(d) 10⁻⁹ m.
(a)
(i) – (d),
(ii) – (a),
(iii) – (b),
(iv) –
(c)
(b)
(i) – (d),
(ii) – (c),
(iii) – (b),
(iv) –
(a)
(c)
(i) – (c),
(ii) – (d),
(iii) – (a),
(iv) –
(b)
(d)
(i) – (c),
(ii) – (a),
(iii) – (d),
(iv) – (b)

[1]

Q3.

The electromagnetic wave travels in free space along X-direction. At a particular point in space and time, B is given by 2·4 × 10⁻⁸ k̂ (in Tesla unit), then at that point E in V/m unit is

(a) 7·2 ĵ
(b) 7·2 î
(c) 0·8 k̂
(d) 2·4 k̂

[1]

Q4.

Statement I : Direct current (DC) is less dangerous than alternating current (AC). Statement II : The rms value of the alternating current (AC) is 70·7% of the peak value.

(a) Only Statement I is true.
(b) Only Statement II is true.
(c) Both Statements I and II are true.
(d) Both Statements I and II are false.

[1]

Q5.

The dimensional formula of coefficient of mutual inductance is

(a) [ ML²T⁻²I² ]
(b) [ ML²T⁻²I⁻² ]
(c) [ ML⁻²T²I² ]
(d) [ ML⁻²T⁻²I⁻² ]

[1]

Q6.

The lines of force of an electric field is shown in the figure below. On which point is the electric field intensity maximum ?

(a) A
(b) B
(c) C
(d) D

[1]

Page 1 of 5

Q7.

Two point charges are placed 0·18 m apart in air. One charge is four times the other charge. If the electric field is zero at a point on the line joining the two charges, then the position of the point is (a) on the extended part of the line of the charges and at a distance of 0·06 m from the larger charge. (b) between the two point charges on the line and at a distance of 0·06 m from the smaller charge. (c) between the two point charges on the line and at a distance of 0·04 m from the larger charge. (d) on the extended part of the line and at a distance of 0·04 m from the smaller charge.

[1]

Q8.

The electric field intensity due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the magnitude of the electric field intensity at the same point will be (a) E (b) E/4 (c) E/2 (d) 2E

[1]

Q9.

Consider an infinite thin plane lamina of uniformly positive charged having a surface charge density σ. At a point P of distance r very near to the lamina, electric field intensity is E. How does the electric field vary with distance ? (a) E–r graph: E decreases with r (falling curve). (b) E–r graph: E rises sharply then decays with r. (c) E–r graph: E increases linearly with r (straight line from origin). (d) E–r graph: E stays constant with r (horizontal line).

[1]

Q10.

Three capacitors having capacitances 1·0 μF, 2·0 μF and 5·0 μF are connected in series with a source of 10 V. The potential difference between the two ends of the capacitor having capacitance 2·0 μF will be (a) 100 V / 17 (b) 20 V / 17 (c) 50 V / 17 (d) 10 V

[1]

Q11.

If the radius of an ideal solenoid be r and magnetic field intensity on its axis according to Ampere's circuital law be B, then (a) B ∝ r (b) B ∝ 1/r (c) B ∝ 1/r² (d) B is independent of r

[1]

Q12.

The resistance of a voltmeter is 300 Ω. It can measure the highest potential difference of 150 volt. The resistance that should be connected to make it a suitable ammeter to measure current up to 8 Amp is (a) 20 Ω, in parallel (b) 20 Ω, in series (c) 30 Ω, in parallel (d) 40 Ω, in series

[1]

Q13.

For a semicircular conductor ( shown in the diagram ) the magnetic field at the centre of the conductor is (a) μ₀i/2a (b) μ₀i/2πa (c) zero (d) μ₀i/4a

[1]

Q14.

At a particular place, the vertical component of earth's magnetic field is two times of its horizontal component. The angle of dip at that place is θ, then tan θ is (a) 2 (b) 1/2 (c) 1/√3 (d) √3

[1]

Q15.

A square loop of side 1 m and resistance 1 Ω is placed in a magnetic field of 0·5 T. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is (a) 0·5 weber (b) 1 weber (c) 0 weber (d) 2 weber

[1]

Page 2 of 5

Q16.

In the figure two electric cells A and B are connected in parallel. Their emfs are 3 volt and 2 volt respectively and internal resistances are 0·2 Ω and 0·3 Ω respectively. The equivalent emf of the system is (a) 5 volt (b) 1 volt (c) 2·4 volt (d) 2·6 volt

[1]

Q17.

Given figure shows I – V curve of a metal wire at three different temperatures T₁, T₂ and T₃. In this case, we can come to a conclusion that (a) T₁ > T₂ > T₃ (b) T₁ < T₂ < T₃ (c) T₁ = T₂ = T₃ (d) T₁ = T₂ > T₃

[1]

Q18.

18 similar cells are connected in mixed combination to get maximum current through an external resistance. If 6 cells are connected in series and such 3 rows are connected in parallel, the ratio of external resistance with internal resistance of one cell is (a) 10 : 1 (b) 5 : 1 (c) 4 : 1 (d) 2 : 1

[1]

Q19.

A potentiometer wire of length 100 cm has resistance 10 Ω. It is connected in series with R and an accumulator of emf 2V and negligible internal resistance. A source of emf 10mV is balanced against 40 cm of the potentiometer wire, as shown in diagram. What is the value of R in ohm ? (a) 700 (b) 750 (c) 790 (d) 800

[1]

Q20.

In the circuit given below, the equivalent resistance between the two points A and B will be (a) 4 Ω (b) 1 Ω (c) 3 Ω (d) 2 Ω

[1]

Q21.

The electric field acting at a region is E = (3î − 4ĵ + 2k̂) V/m. In that region the electric flux associated with a square of side 2 m placed in Y-Z plane is (a) 12 Vm (b) 6 Vm (c) − 16 Vm (d) 8 Vm

[1]

Q22.

The dielectric constant of the medium between the two plates of a parallel plate capacitor is 2. Its capacitance is 3μF. Now, the separation between the plates is made doubled and in that vacant space a plate of dielectric constant K = 4 is inserted. Now, the capacitance of the capacitor will be (a) 1 μF (b) 2 μF (c) 6 μF (d) 9 μF

[1]

Q23.

The capacitances of two conductors X and Y are 3C and C respectively. The conductor X is given a charge Q which the conductor shares with Y. The ratio of total shared energy to its total initial energy is (a) 9 : 16 (b) √3 : 2 (c) 3 : 4 (d) 4 : 3

[1]

Page 3 of 5

Q24.

Which of the following statement(s) is/are true ? A potential difference of V is applied at the two ends of a conductor of length l and area of cross-section A. Statement I : When potential difference is doubled, current density also gets doubled. Statement II : When potential difference is doubled, drift velocity gets halved. Statement III : When area of cross-section is doubled, current density decreases. (a) I and II are true (b) Only I is true (c) Only III is true (d) II and III are true

[1]

Q25.

A wire of length l and resistance R is stretched till its length becomes x times its original length. Its new resistance will be (a) x²R (b) xR (c) R / x (d) R

[1]

Q26.

In which case will the null condition of a Wheatstone bridge change ? (a) If the resistances in different arms are changed (b) If the positions of the battery and the galvanometer are interchanged (c) If a battery of different emf is used (d) If a galvanometer of different resistance is used

[1]

Q27.

The ratio of the radii of two circular loops is 1 : 2. The ratio of their magnetic moments is 1 : 2. The ratio of currents flowing through them is (a) 1 : 1 (b) 2 : 1 (c) 4 : 1 (d) 1 : 4

[1]

Q28.

The force acting between two parallel current carrying wires is F. If the current through each wire is doubled and separation becomes three times, then the acting force between them will be (a) 12 F (b) 4F/3 (c) 4F/9 (d) 2F/9

[1]

Q29.

Magnetic moment of a steel wire is M. If the wire is turned into semicircle by bending it, then the new magnetic moment of the wire will be (a) M (b) 2M/π (c) M/2π (d) M/π

[1]

Q30.

Which one is correct for a diamagnetic substance ? (a) B = H (b) B < H (c) B > H (d) B >> H

[1]

Q31.

The expression for the magnetic flux in a circuit having resistance 7 Ω is φ = 6t² − 5t + 4. In time t = 1 second, the induced current will be (a) 1·2 A (b) 0·8 A (c) 0·5 A (d) 1 A

[1]

Q32.

The equation of an alternating electromotive force is E = 220 sin(100πt − π/15) V, here t is in second. Its rms value and frequency are respectively (a) (220/√2) V, 50 Hz (b) 220 V, 50 Hz (c) (220/√2) V, 100 Hz (d) 220√2 V, 50 Hz

[1]

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Q33.

The condition of getting maximum current in an LCR series circuit is (a) XL = 0 (b) XC = 0 (c) XL = XC (d) R = XL − XC

[1]

Q34.

The ratio of rms value and average value of current for a half cycle of an AC circuit is (a) √2 : π (b) √2 : 1 (c) 2√2 : π (d) π : 2√2

[1]

Q35.

A transformer carries 4A current in the primary coil of 500 turns. If the input power is 1 kW, what should be the number of turns in the secondary coil to have a 500 V output ? (a) 1000 (b) 400 (c) 2000 (d) 1500

[1]

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