Physics · Class 12 Science

Mizoram Mbse 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.

2021–2025
Years of papers: 5
Total Papers: 5
Real Board Papers: 0
Sample papers: 162
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

30 Q2025complete

33 Q2024complete

33 Q2023complete

33 Q2022complete

33 Q2021complete

Mizoram Board of School Education HSSLC 2025 · Set ANNUAL

Real board examination

About this paper

The real Class-12 board examination held in 2025. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks: 70
Questions: 30
Duration: 180 min
Sections: 4

The marks / questions / duration above are the official exam pattern. We currently have 30 of this paper’s questions (100% of the full paper), with 30 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
MCQ (1 mark)Section MCQ (1 mark)	compulsory	14	1	14
Short Answer (2 marks)Section Short Answer (2 marks)	compulsory	7	2	14
Short Answer (4 marks)Section Short Answer (4 marks)	compulsory	6	4	24
Long Answer (6 marks)Section Long Answer (6 marks)	compulsory	3	6	18
Total		30		70

The question paper

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

Board Examination

Physics

Mizoram Board of School Education HSSLC 2025 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 30 questions divided into 4 sections — MCQ (1 mark), Short Answer (2 marks), Short Answer (4 marks), Long Answer (6 marks).
Section MCQ (1 mark) comprises 14 questions of 1 mark each (compulsory).
Section Short Answer (2 marks) comprises 7 questions of 2 marks each (compulsory).
Section Short Answer (4 marks) comprises 6 questions of 4 marks each (compulsory).
Section Long Answer (6 marks) comprises 3 questions of 6 marks each (compulsory).

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

Section A

Q1.

How does the resistance of a conductor vary as a function of temperature ?

(a) remain same
(b) decrease
(c) increase
(d) first increase then decrease

[1]

Q2.

The specific resistance of a conductor increases with –

(a) decrease in length
(b) increase in temperature
(c) increase in cross sectional area
(d) decrease in cross sectional area

[1]

Q3.

If R1 and R2 are respectively the filament resistance of a 200 W bulb and a 100 W bulb designed to operate on the same voltage, then –

(a) R1 = 2R2
(b) R2 = 2R1
(c) R2 = 4R1
(d) R1 = 4R2

[1]

Q4.

When a charged particle moving with velocity v (vector) is subjected to a magnetic field of induction B (vector), the force on it is non zero. This implies that –

(a) angle between them is either zero or 180°
(b) angle between them is necessarily 90°
(c) angle between them can have any value other than 90°
(d) angle between them can have any value other than zero and 180°

[1]

Q5.

Lenz's law is a consequence of the law of conservation of –

(a) charge
(b) momentum
(c) energy
(d) mass

[1]

Q6.

When LCR series circuit is at resonance then the phase angle (phi) between current and voltage is –

(a) pi/2
(b) pi
(c) 2 pi
(d) 0

[1]

Page 1 of 5

Q7.

In electromagnetic induction, the induced e.m.f is independent of – (a) change of flux (b) time (c) number of turns of the coil (d) resistance of the coil

[1]

Q8.

The frequency of gamma-rays, x-rays and ultra-violet rays are a, b and c respectively. Then – (a) a < b < c (b) a > b > c (c) a = b = c (d) a > c > b

[1]

Q9.

Energy E of a hydrogen atom with principal quantum number 'n' is given by E = -13.6/n² eV. The energy of a photon ejected, when the electron jumps from n=3 state to n=2 state of hydrogen atom is approximately – (a) 1.5 eV (b) 0.85 eV (c) 3.4 eV (d) 1.9 eV

[1]

Q10.

In which region of electromagnetic spectrum, does the Lyman series of hydrogen atom lie ? (a) infrared (b) visible (c) ultraviolet (d) X ray

[1]

Q11.

If red light and violet rays are of focal lengths fr and fv, then which one of the following is true ? (a) lambdar <= lambdav (b) lambdar = lambdav (c) mur > muv (d) mur < muv

[1]

Q12.

Two thin lenses of focal length f1 and f2 are in contact and coaxial. The power of the combination is – (a) (f1 + f2)/2 (b) (f1 + f2)/(f1 f2) (c) sqrt(f1/f2) (d) sqrt(f2/f1)

[1]

Q13.

How is interference pattern in double slit experiment affected, if a source of blue light is used in place of yellow light producing the same intensity ? (a) The fringe width will decrease (b) The fringe width will increase (c) The fringe width will become brighter (d) The fringe width will become fainter

[1]

Q14.

In a p-type semiconductor the majority carrier of current are – (a) electron (b) holes (c) proton (d) neutron

[1]

Section B

Q1.

The electric potential at 0.1 m from a point charge is 15 V. What is the magnitude of the charge ?

[2]

Page 2 of 5

Q2.

What is the amount of work done in moving a point charge Q around a circular arc of radius r at the centre of which, another point charge q is located ?

[2]

Q3.

Name the characteristics of electromagnetic waves that (i) increase (ii) remains constant in the electromagnetic spectrum as one moves from radiowave region towards ultraviolet region.

[2]

Q4.

In Young's double slit experiment, the fringe width obtained is 3 mm in air. If the apparatus is immersed in water (mu = 4/3). What will be the new fringe width ?

[2]

Q5.

An electron and proton are moving with the same speed. Deduce which will have more wavelength ?

[2]

Q6.

An X-ray tube produce a continuous spectrum of radiation with its short wavelength end at 0.66 angstrom. What is the maximum energy of a photon in eV ?

[2]

Q7.

Differentiate between isotopes and isobars with suitable examples.

[2]

Section C

Q1.

What is meant by internal resistance of a cell ? The potential difference across the terminals of a battery is 8.5 V, when a current of 3A flows through it from its negative terminal to the positive terminal. When a current of 2A flows through it in opposite direction, the terminal potential difference is 11 V. Find the internal resistance of the battery and its emf. (1+3=4) **OR** Explain the term drift velocity of electrons. Hence obtain the expression for the current through the conductor in terms of drift velocity. (1+3=4)

[4]

Page 3 of 5

Q2.

A moving coil galvanometer of resistance 10 ohm produced full scale deflection when a current of 25 mA passes through it. Describe showing full calculations, how will you convert the galvanometer into – (a) a voltmeter reading upto 120 V and (b) an ammeter reading upto 20 A. (2+2=4)

[4]

Q3.

Give the relation for force between two parallel wires carrying current in the same direction and hence define one ampere from it. State the nature of this force by giving the reason for it. (1+1+2=4) **OR** Using Biot-Savart's law, derive the expression for the magnetic field at the centre of a circular coil carrying current. What is the direction of it ? (3+1=4)

[4]

Q4.

What is total internal reflection ? What are the necessary conditions for it ? Obtain a relation between critical angle and refraction index of the medium. (1+1+2=4)

[4]

Q5.

Draw the graph showing the variation of binding energy per nucleon with mass number. Write three main inferences drawn from the graph. (1+3=4) **OR** Giving the radii of two nuclei of mass numbers A1 and A2 as R1 and R2 respectively. What will be the ratio of the radii ? If the radius of 13Al27 nucleus is found to be 3.6 fermi. Find the radius of 29Cu64. (2+2=4)

[4]

Q6.

What is the barrier voltage for a germanium and a silicon diode ? With the help of a circuit diagram, explain the use of p-n junction diode as full wave rectifier, giving its input and output waveforms. (1+3=4)

[4]

Page 4 of 5

Section D

Q1.

Define electric potential. Obtain an expression for the electric potential at a point at a distance r from an isolated positive charge. What is the S.I unit of it and hence define one volt ? (1+4+1=6) **OR** Define electric field intensity. Derive an expression for electric field at a point on the equitorial line of an electric dipole. What is the direction of the electric field ? (1+4+1=6)

[6]

Q2.

Define root mean square value of an a.c. Derive the relation between virtual value or r.m.s value of an a.c and peak value of a.c. The electric mains in a house are marked as 220 V, 50 Hz. Write down the equation for the instantaneous voltage. (1+4+1=6) **OR** Explain with the help of a suitable diagram the principle, construction and working of a transformer. Why is the transmission of a.c done at high voltage ? (6)

[6]

Q3.

With the help of a ray diagram, show how a compound microscope forms a magnified image of a tiny object, at least distance of distinct vision. Hence, derive an expression for the magnification produced by it and define its magnifying power. (5+1=6)

[6]

Page 5 of 5