HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2024-2025
Date: March 2025
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General Instructions: The question paper is divided into four sections.
- Section A: Q. No.1 contains Ten multiple-choice types 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 contains 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 questions carrying Three marks each. (Attempt any Eight).
- Section D: Q.No.27 to Q.No.31 contain Five long answer type 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 each multiple choice type question, it is mandatory to write the correct answer along with its alphabet, e.g., (a) ............../(b) ............... /(c) .............../(d) ................, No marks(s) shall be given, if ONLY the correct
answer or the alphabet of the correct answer is written. Only the first attempt will be considered for evaluation. - Physical Constants:
(i) mass of electron m = 9.1 × 10-31 kg
(ii) ε0 = 8.85 × 10-12 `C^2/(Nm^2)`
(iii) π = 3.142
(iv) charge on electron e = 1.6 × 10-19C
(v) µ0 = 4π × 10-7 Wb/Am
(vi) h = 6.63 × 10-34 Js
(vii) C = 3 × 108 m/s
A charged particle is in motion having initial velocity `vecv` when it enters into a region of uniform magnetic field perpendicular to `vecv`. Because of the magnetic force the kinetic energy of the particle will ______.
remain unchanged
get reduced
increase
be reduced to zero
Chapter: [0.1] Magnetic Fields Due to Electric Current
The ratio of emissive power of perfect blackbody at 1327°C and 527°C is ______.
4:1
16:1
2:1
8:1
Chapter: [0.03] Kinetic Theory of Gases and Radiation
An electron, a proton, an α-particle, and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for ______.
Electron
Proton
α-particle
Hydrogen atom
Chapter: [0.14] Dual Nature of Radiation and Matter
Multiple Choice Question.
Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is
1: 2
2: 1
1: 4
4: 1
Chapter: [0.02] Mechanical Properties of Fluids
Choose the correct option:
A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on charge, potential, capacitance respectively are ______.
Constant, decreases, decreases
Increases, decreases, decreases
Constant, decreases, increases
Constant, increases, decreases
Chapter: [0.08] Electrostatics
A thin walled hollow cylinder is rolling down an incline, without slipping. At any instant, without slipping. At any instant, the ratio "Rotational K.E.: Translational K.E.: Total K.E." is ______.
1 : 1 : 2
1 : 2 : 3
1 : 1 : 1
2 : 1 : 3
Chapter: [0.01] Rotational Dynamics
In a series LCR circuit, the phase difference between the voltage and the current is 45°. Then the power factor will be ______.
0.607
0.707
0.808
1
Chapter: [0.13] AC Circuits
During refrigeration cycle, heat is rejected by the refrigerant in the ______.
Condenser
Cold chamber
Evaporator
Hot chamber
Chapter: [0.04] Thermodynamics
Choose the correct option.
A conducting thick copper rod of length 1 m carries a current of 15A and is located on the Earth's equator. There the magnetic flux lines of Earth's magnetic field are horizontal, with the field of 1.3 x 10-4T, south to north. The magnitude and direction of the force on the rod, when it is oriented so that current flows from west to east are ______.
14 × 10-4N, downward
20 × 10-4N, downward
14 × 10-4N, upward
20 × 10-4N, upward
Chapter: [0.1] Magnetic Fields Due to Electric Current
Choose the correct option.
In the spectrum of the hydrogen atom which transition will yield the longest wavelength?
n = 2 to n = 1
n = 5 to n = 4
n = 7 to n = 6
n = 8 to n = 7
Chapter: [0.15] Structure of Atoms and Nuclei
What is Brewster’s law? Derive the formula for Brewster angle.
Chapter: [0.07] Wave Optics
Do we need a banked road for a two-wheeler? Explain.
Chapter: [0.01] Rotational Dynamics
What do you understand by the term wave-particle duality? Where does it apply?
Chapter: [0.14] Dual Nature of Radiation and Matter
A star is emitting light at the wavelength of 5000 Å. Determine the limit of resolution of a telescope having an objective of a diameter of 200 inch.
Chapter: [0.07] Wave Optics
Answer in brief:
A metal plate is introduced between the plates of a charged parallel plate capacitor. What is its effect on the capacitance of the capacitor?
Chapter:
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A voltmeter has a resistance of 30 Ω. What will be its reading, when it is connected across a cell of emf 2 V having internal resistance 10 Ω?
Chapter: [0.09] Current Electricity
Explain why the inductance of two coils connected in parallel is less than the inductance of either coil.
Chapter: [0.12] Electromagnetic Induction [0.16] Electromagnetic Inductions
Answer in brief.
Why should a Carnot cycle have two isothermal two adiabatic processes?
Chapter: [0.04] Thermodynamics
Why are multiple colours observed over a thin film of oil floating on water? Explain with the help of a diagram.
Chapter: [0.07] Wave Optics
At what distance from the mean position is the speed of a particle performing S.H.M. half its maximum speed. Given the path length of S.H.M. = 10 cm.
Chapter: [0.05] Oscillations
If the effective current in a 50 cycle AC circuit is 5 A, what is the peak value of current? What is the current 1/600 after if was zero?
Chapter: [0.13] AC Circuits
Why is the surface tension of paints and lubricating oils kept low?
Chapter: [0.02] Mechanical Properties of Fluids [0.06] Surface Tension
A system releases 130 kJ of heat while 109 kJ of work is done on the system. Calculate the change in internal energy.
Chapter: [0.04] Thermodynamics
Answer in brief:
State the characteristics of stationary waves.
Chapter: [0.06] Superposition of Waves
State the importance of Davisson and Germer experiment.
Chapter: [0.14] Dual Nature of Radiation and Matter
White light consists of wavelengths from 400 nm to 700 nm. What will be the wavelength range seen when white light is passed through a glass of refractive index 1.55?
Chapter: [0.07] Wave Optics
A voltmeter has a resistance of 30 Ω. What will be its reading, when it is connected across a cell of emf 2 V having internal resistance 10 Ω?
Chapter: [0.09] Current Electricity
What is electromagnetic induction?
Chapter: [0.12] Electromagnetic Induction [0.16] Electromagnetic Inductions
State Faraday's laws of electromagnetic induction.
Chapter: [0.12] Electromagnetic Induction
Calculate the value of the magnetic field at a distance of 2 cm from a very long straight wire carrying a current of 5 A (Given: μ0 = 4π × 10-7 Wb/Am).
Chapter: [0.1] Magnetic Fields Due to Electric Current
Mention the conditions under which a real gas obeys the ideal gas equation.
Chapter: [0.03] Kinetic Theory of Gases and Radiation
A gas contained in a cylinder fitted with a frictionless piston expands against a constant external pressure of 1 atm from a volume of 5 liters to a volume of 10 liters. In doing so it absorbs 400J of thermal energy from its surroundings. Determine the change in the internal energy of the system.
Chapter: [0.04] Thermodynamics
Why are the emitter, the base, and the collector of a BJT doped differently?
Chapter: [0.16] Semiconductor Devices
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Discuss the interlink between translational, rotational and total kinetic energies of a rigid object rolls without slipping.
Chapter: [0.01] Rotational Dynamics [0.03] Angular Momentum
A 6 μF capacitor is charged by a 300 V supply. It is then disconnected from the supply and is connected to another uncharged 3 μF capacitor. How much electrostatic energy of the first capacitor is lost in the form of heat and electromagnetic radiation?
Chapter:
Obtain an expression for the orbital magnetic moment of an electron rotating about the nucleus in an atom.
Chapter: [0.11] Magnetic Materials
A wave of frequency 500 Hz is traveling with a speed of 350 m/s. (a) What is the phase difference between two displacements at a certain point at times 1.0 ms apart? (b) what will be the smallest distance between two points which are 45° out of phase at an instant of time?
Chapter: [0.06] Superposition of Waves
A 15.0 μF capacitor is connected to a 220 V, 50 Hz source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what will happen to the capacitive reactance and the current?
Chapter: [0.13] AC Circuits
Describe Young's double-slit interference experiment and derive conditions for occurrence of dark and bright fringes on the screen. Define fringe width and derive a formula for it.
Chapter: [0.07] Wave Optics
Why two or more mercury drops form a single drop when brought in contact with each other?
Chapter: [0.02] Mechanical Properties of Fluids
What is the difference between a nuclear reactor and a nuclear bomb?
Chapter: [0.15] Structure of Atoms and Nuclei
Derive the laws of reflection of light using Huygens’ principle.
Chapter: [0.07] Wave Optics
Obtain an expression for the orbital magnetic moment of an electron rotating about the nucleus in an atom.
Chapter: [0.11] Magnetic Materials
Answer in brief.
State the postulates of Bohr’s atomic model.
Chapter: [0.15] Structure of Atoms and Nuclei
A short bar magnet is placed in an external magnetic field of 700 gauss. When its axis makes an angle of 30° with the external magnetic field, it experiences a torque of 0.014 Nm. Find the magnetic moment of the magnet, and the work done in moving it from its most stable to the most unstable position.
Chapter: [0.11] Magnetic Materials
In a parallel plate capacitor with air between the plates, each plate has an area of 6 x 10−3 m2 and the separation between the plates is 2 mm.
- Calculate the capacitance of the capacitor.
- If this capacitor is connected to 100 V supply, what would be the charge on each plate?
- How would charge on the plates be affected if a 2 mm thick mica sheet of k = 6 is inserted between the plates while the voltage supply remains connected?
Chapter:
On what factors do the degrees of freedom depend?
Chapter: [0.03] Kinetic Theory of Gases and Radiation [0.09] Kinetic Theory of Gases and Radiation
An aircraft of wing span of 50 m flies horizontally in the Earth's magnetic field of 6 x 10-5 T at a speed of 400 m/s. Calculate the emf generated between the tips of the wings of the aircraft.
Chapter: [0.12] Electromagnetic Induction
In a Faraday disc dynamo, a metal disc of radius R rotates with an angular velocity ω about an axis perpendicular to the plane of the disc and passing through its center. The disc is placed in a magnetic field B acting perpendicular to the plane of the disc. Determine the induced emf between the rim and the axis of the disc.
Chapter: [0.12] Electromagnetic Induction
Answer in brief:
Derive an expression which relates angular momentum with the angular velocity of a rigid body.
Chapter: [0.01] Rotational Dynamics
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Maharashtra State Board previous year question papers 12th Standard Board Exam Physics with solutions 2024 - 2025
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