HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2025-2026
Date & Time: 16th February 2026, 11:00 am
Duration: 3h
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General Instructions:
The question paper is divided into four sections:
- Section A: Q. No. 1 contains Ten multiple choice type of questions carrying One mark each.
Q. No. 2 contains Eight very short answer type of questions carrying One mark each. - Section B: Q. No. 3 to Q. No. 14 contain Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
- Section C: Q. No. 15 to Q. No. 26 contain Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
- Section D: Q. No. 27 to Q. No. 31 contain Five long answer type of questions carrying Four marks each. (Attempt any Three).
- Use of the log table is allowed. Use of calculator is not allowed.
- Figures to the right indicate full marks.
- For multiple choice type of questions, only the first attempt will be considered for evaluation.
- Physical constants:
- h = 6.63 × 10−34 Js
- c = 3 × 108 m/s
- π = 3.142
- g = 9.8 m/s2
- ε0 = 8.85 × 10−12 C2/Nm2
- μ0 = 4π × 10−7 Wb/A − m
When a number of droplets coalesce to form a single drop, the total surface area of the drop ______.
decreases
becomes zero
remains same
increases
Chapter:
In an ideal gas, the molecules possess ______.
Only kinetic energy
Both kinetic energy and potential energy
Only potential energy
Neither kinetic energy nor potential energy
Chapter: [3] Kinetic Theory of Gases and Radiation
If the frequency of incident radiation is increased above threshold frequency, keeping intensity and potential constant then the photoelectric current ______.
decreases
becomes zero
remains same
increases
Chapter:
The process in which heat is neither absorbed nor released by a system is called ______.
isobaric
isochoric
isothermal
adiabatic
Chapter:
The period of a conical pendulum in terms of its length (l), semi-vertical angle (θ) and acceleration due to gravity (g) is ______.
`1/(2 pi) sqrt((l cos theta)/g)`
`1/(2 pi)sqrt((l sin theta)/g)`
`4 pi sqrt((l cos theta)/(4 g))`
`4 pi sqrt((l tan theta)/g)`
Chapter: [4] Oscillations
A conducting rod of length l, rotates about one of its ends in a uniform magnetic field B, with a constant angular velocity ω. If the plane of rotation is perpendicular to B, the e.m.f. induced between the ends of rod is ______.
`1/2 B omega l^2`
Bωl2
2Bωl2
Bωl
Chapter:
A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths of emitted radiation is ______.
1 : 4
1 : 2
2 : 1
4 : 1
Chapter:
A particle is subjected to two parallel S.H.M.s such that x = 2 sin ωt and y = `2 sin (omega t + pi/3)`. The amplitude of the resultant S.H.M. will be ______.
0
`2 sqrt 3`
4
12
Chapter:
A bar magnet of magnetic moment 10 Am2 has a cross sectional area of 2.5 × 10−4 m2. If the intensity of magnetisation of magnet is 106 A/m, the losgth oft bar magnet is ______.
2 cm
4 cm
6 cm
8 cm
Chapter:
In series LCR circuit for XL > XC, tan Φ will be ______.
negative
zero
positive
infinity
Chapter:
State the formula for electric field intensity due to uniformly charged spherical shell.
Chapter:
Name an instrument for measurement of e.m.f. of a cell.
Chapter:
Calculate the magnitude of force experienced by a stationary charge exposed to uniform magnetic field.
Chapter:
Which property of bar magnet is used in navigation?
Chapter:
In Young’s double slit experiment, width of the two slits are in the ratio 25 : 1. Calculate the ratio of amplitudes.
Chapter:
If the tension in sonometer wire is increased by 21%, compare the initial frequency with the later.
Chapter:
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What are eddy currents?
Chapter: [12] Electromagnetic Induction
State applications of eddy currents.
Chapter: [12] Electromagnetic Induction
State any two sources of errors in the meter-bridge experiment. Explain how they can be minimized.
Chapter: [9] Current Electricity [13] Current Electricity
Draw a ray diagram showing position of virtual sources and region of interference in biprism experiment.
Chapter:
Derive an expression for radius of nth Bohr orbit.
Chapter:
A ceiling fan has a moment of inertia of 2 kg. m2. It attains maximum frequency of 60 r.p.m. in 2π seconds. Calculate its power rating.
Chapter: [1] Rotational Dynamics
An electric dipole consists of two unlike charges of magnitude 2 × 10−6 C each and separated by 4 cm. The dipole is placed in an external electric field of 105 N/C. Calculate the work done by an external agent to turn the dipole through 180°.
Chapter:
Derive the expression for magnetic field produced by a current in a circular arc of wire.
Chapter: [10] Magnetic Fields Due to Electric Current
Distinguish between an overtone and harmonic.
Chapter: [6] Superposition of Waves
A steel ball with radius 0.3 mm is falling with velocity of 2 m/s through a tube filled with glycerine. Calculate viscous force acting on the steel ball.
[Given: `N_"glycerine"` = 0.833 Ns/m2]
Chapter:
Calculate the temperature at which the average kinetic energy of a molecule of a gas will be same as that of an electron accelerated through 1 volt.
[Given: kB = 1.4 × 10−2 J/k, e = 1.6 × 10−19 C]
Chapter:
An inductor of inductance 200 mH is connected to an A.C. source of peak e.m.f. 220 V and frequency 50 Hz. Calculate the peak current in the circuit.
Chapter:
In a thermodynamic system, define mechanical equilibrium.
Chapter:
In a thermodynamic system, define chemical equilibrium.
Chapter:
In a thermodynamic system, define thermal equilibrium.
Chapter:
In a series, LCR circuit, obtain an expression for the resonant frequency,
Chapter: [13] AC Circuits
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Obtain the expression for the period of a magnet vibrating in a uniform magnetic field and performing S.H.M.
Chapter: [5] Oscillations
Define magnetization.
Chapter: [11] Magnetic Materials [15] Magnetism
State formula and S.I. unit of Magnetization.
Chapter: [11] Magnetic Materials [15] Magnetism
What is the relation between permeability and magnetic susceptibility?
Chapter:
Derive an expression for electrostatic potential due to a point charge.
Chapter:
Derive an expression for de Broglie wavelength of electrons.
Chapter:
Draw a neat diagram of a full-wave rectifier and explain it’s working.
Chapter: [16] Semiconductor Devices
The string of a guitar is 80 cm long and has a fundamental frequency of 112 Hz. If a guitarist wishes to produce a frequency of 160 Hz, where should the person press the string?
Chapter: [6] Superposition of Waves
0.5 mole of an ideal gas at 300 K, expands isothermally from an initial volume of 2 L to a final volume of 6 L.
Calculate:
- work done by the gas
- heat supplied to the gas.
[Given: R = 8.31 J mol−1 K−1]
Chapter:
A galvanometer has a resistance of 40 Ω and a current of 4 mA is needed for full scale deflection. What is the resistance and how is it to be connected to convert the galvanometer
- into an ammeter of 0.4 A range and
- into a voltmeter of 5 V range?
Chapter:
A coaxial cable consists of a central conducting core wire of radius ‘a’ and a coaxial cylindrical outer conductor of radius ‘b’. The two conductors carry equal current in opposite directions, in and out of the plane of the paper. What will be the magnitude of magnetic induction B for
- a < r < b and
- b < r?
What will be its direction?
where ‘r’ is the radius of the Ampere’s circular loop.
Chapter:
Energy of an electron in second Bohr orbit is −3.4 eV. Calculate its kinetic energy and potential energy in third Bohr orbit.
Chapter:
Derive Laplace’s law for spherical membrane of bubble due to surface tension.
Chapter:
Derive an expression for maximum safety speed with which a vehicle should move along a curved horizontal road. State the significance of it.
Chapter: [1] Rotational Dynamics
Moment of intertia of a solid sphere about its diameter is 25 kg m2. Calculate its moment of inertia about a tangent.
Chapter:
Derive the relation between coefficient of absorption, coefficient of reflection and coefficient of transmission.
Chapter:
Answer in brief:
Compare the rms speed of hydrogen molecules at 127°C with rms speed of oxygen molecules at 27ºC given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.
Chapter: [3] Kinetic Theory of Gases and Radiation
Define self-inductance.
Chapter: [12] Electromagnetic Induction [16] Electromagnetic Inductions
Define Mutual Inductance.
Chapter: [12] Electromagnetic Induction [16] Electromagnetic Inductions
A conducting loop of area 1m2 is placed normal to a uniform magnetic field of 3 Wb/m2. If the magnetic field is uniformly reduced to 1 Wb/m2 in 0.5 second, calculate the induced emf produced in the coil.
Chapter:
Using analytical method, obtain an expression for the fringe width of two interfering waves.
Chapter:
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