ISC Physics 2025 Practice Paper with Answers
All 95 questions of the ISC Physics 2025 Practice Paper, in printed order. Open a question to read it in full and see its answer.
- Q1 Three lenses $L_1$, $L_2$, and $L_3$ are specified in the given table below. To construct an astronomical telescope, which one of… 1 mark · MCQ
- Q2 An ideal Moving Coil Galvanometer (MCG) cannot be used as an ammeter to measure the value of current in a given circuit. The… 1 mark · MCQ
- Q3 What will be the output for the given circuit? 1 mark · MCQ
- Q4 The graphs shown below are for three different Inductance, Capacitance, and Resistance (LCR) circuits (1), (2), and (3). Identify… 1 mark · MCQ
- Q5 Sheetal had 6 identical cells, each of electromotive force (emf) 4 V and internal resistance 'r'. She connected them to an… 1 mark · MCQ
- Q6 Lorenz's force is: 1 mark · MCQ
- Q7 A charged particle is moving with velocity $\vec{v}$ in a magnetic field of induction $\vec{B}$. The force on the particle will… 1 mark · MCQ
- Q8 Ampere's circuital law states that: 1 mark · MCQ
- Q9 The magnetic induction at any point due to a long straight wire carrying a current is: 1 mark · MCQ
- Q10 The energy of an electron in the ground state of a hydrogen atom is $-13.6\text{ eV}$. What will be the ratios of energies in the… 1 mark · MCQ
- Q11 Which of the following is NOT a limitation of Bohr’s theory? 1 mark · MCQ
- Q12 It was found that certain metals like Zinc, Cadmium, Magnesium, etc. are photosensitive only to ultraviolet light. However, some… 1 mark · MCQ
- Q13 An alternating current (a.c.) voltage source at 50 Hz is applied to a series combination of resistor A of resistance ‘P' and… 1 mark · MCQ
- Q14 Consider an alternating current (a.c.) source whose angular frequency ($\omega$) changes constantly but has a fixed peak voltage… 1 mark · MCQ
- Q15 The speed of electromagnetic waves in free space is given by (in usual notations): 1 mark · MCQ
- Q16 Which of the following statement is true? 1 mark · MCQ
- Q17 The current passing through a wire varies with time as provided below. The charge passing through the wire from 0s to 5s is: 1 mark · MCQ
- Q18 A current I is flowing through a wire of non-uniform cross-section as shown in the figure. Which of the following options gives… 1 mark · MCQ
- Q19 Each of the batteries connected in the circuit is of electromotive force (emf) 4V and internal resistance of 1 ohm. What is the… 1 mark · MCQ
- Q20 A non-conducting sphere A, attached to an insulated handle is given a charge $+q$. It is brought near a non-conducting sphere B… 1 mark · MCQ
- Q21 The work function of caesium metal is 2.04 eV and a graph between the variation of photoelectric current with a collector plate… 1 mark · MCQ
- Q22 The electric field strength is greatest at point A and reduces from A to E. The diagram below shows the equipotential surfaces in… 1 mark · Assertion-reason
- Q23 In a ferromagnetic material, all the atomic magnets have dipole moments in the same direction. 1 mark · Assertion-reason
- Q24 The graph for 'v' versus 'u' of a concave mirror forming real images, falls within the second quadrant. 1 mark · Assertion-reason
- Q25 The wave nature of matter is what prevents atoms from collapsing and gives atoms their sizes. 1 mark · Assertion-reason
- Q26 The given graph shows the variation of charge on plates (q) versus the potential difference (V) between the plates of two… 1 mark · Short answer
- Q27 A hollow sphere made of material 'X' is placed in a region of electric field. The pattern of electric field lines around the… 1 mark · Short answer
- Q28 Four charges $+Q, +Q, -Q$, and $-Q$ are placed in an arrangement as shown. The direction of the net electric field at a point 'P'… 1 mark · Short answer
- Q29 Using a cell of electromotive force (e.m.f.) $\varepsilon$ and internal resistance 'r', a student designs an electrical circuit… 1 mark · Short answer
- Q30 A finite-length Movable wire (XY) carrying current $i_1$ is kept parallel to another infinite-length Fixed wire (PQ) carrying… 1 mark · Short answer
- Q31 A charge $10\ \mu\text{C}$ enters a region of the uniform magnetic field with a velocity $(4\hat{i} + 5\hat{j})\text{ m/s}$ and… 1 mark · Numerical
- Q32 A galvanometer of resistance $3\ \Omega$ can carry a maximum current of $25\text{ mA}$. Calculate the value of shunt resistance… 1 mark · Numerical
- Q33 In the X - Y plane, a magnetic field of $4\text{ T}$ is applied along the Y-axis. Calculate the magnetic force on a proton, if it… 1 mark · Numerical
- Q34 How is the refractive index of the material of a prism dependent on the angle of incidence? 1 mark · Short answer
- Q35 If you had to construct an optical fibre using the two materials, which would you prefer for the core and the cladding? X: with a… 1 mark · Short answer
- Q36 A lens forms the image of an object as shown in the figure. Identify the type of lens. 1 mark · Short answer
- Q37 Redraw the diagram with the correct orientation of the obscured (hidden) optical device, so that when a plane wavefront is… 1 mark · Drawing
- Q38 A light-emitting diode (LED) is connected in forward biasing. If its potential barrier is given by ‘$V_0$’ when no biasing is… 1 mark · Drawing
- Q39 An electron is revolving around the nucleus of a hydrogen atom. If the radius of the first orbit is… 1 mark · Numerical
- Q40 A 9.2 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted if any? 1 mark · Short answer
- Q41 Calculate the wavelength of a photon needed to ionize a hydrogen atom. 1 mark · Numerical
- Q42 The kinetic energy of an $\alpha$-particle incident on a gold foil is doubled. How does the distance of the closest approach… 1 mark · Short answer
- Q43 The electric current flowing in a wire in the direction B to A is decreasing. What is the direction of the induced current in the… 1 mark · Short answer
- Q44 A circular coil of radius 8 cm and 20 turns rotates about its vertical diameter with an angular speed of $50\text{ s}^{-1}$ in a… 1 mark · Numerical
- Q45 Give the expression for the power factor in an LR circuit in terms of the resistance ‘R’ and inductive reactance ‘$X_L$’. 1 mark · Short answer
- Q46 Two long wires carrying current are kept crossed (not touching each other) as shown in figure. If resultant magnetic induction at… 2 marks · Short answer
- Q47 Which material is used to make this glass slab? 2 marks · Short answer
- Q48 In a Wheatstone bridge, three resistances P, Q, and R are connected in the three arms, and the fourth arm is formed by two… 2 marks · Derivation
- Q49 A thin convex lens of focal length f is cut into parts and then combined as shown in Fig 1 and Fig 2. Evaluate the focal length… 2 marks · Short answer
- Q50 A changing electric field produces a magnetic field and vice versa, resulting in an electromagnetic wave. If a charged particle… 2 marks · Short answer
- Q51 The first diagram depicts a bar magnet of pole strength ‘m’ and separation between the poles ‘$\lambda$’. If the magnetic moment… 2 marks · Short answer
- Q52 Observe the two diagrams and state which diagram corresponds to diamagnetic and ferromagnetic. 2 marks · Short answer
- Q53 A long straight wire in the horizontal plane carries a current of 50 A in the north-to-south direction. Give the magnitude and… 2 marks · Numerical
- Q54 For the given $|m|$ versus $|v|$ graph of a spherical mirror: Name the type of mirror used here. What is its focal length? 2 marks · Short answer
- Q55 Calculate the refractive index of the material of the prism. 2 marks · Numerical
- Q56 Give the values of X and Y in terms of $\lambda$ and the corresponding phase difference. 2 marks · Short answer
- Q57 Two cells of electromotive forces (e.m.f.s.) approximately 5 V and 10 V are to be accurately compared using a potentiometer of… 2 marks · Short answer
- Q58 A student wants to place three charges ‘-q’, ‘Q’, and ‘-q’ in such a way that the potential energy of the system is zero. The… 2 marks · Numerical
- Q59 The student sets up an experiment in the lab to determine the internal resistance of a cell by graphical method. The setup of the… 2 marks · Short answer
- Q60 Images produced by positron emitters have become important in recent years. When the emitted positron ($\beta^+$) encounters an… 2 marks · Short answer
- Q61 In the first atomic bomb, the energy released was equivalent to about 30 kilotons of Trinitrotoluene (TNT), where a ton of TNT… 2 marks · Numerical
- Q62 Draw a graph showing the variation of binding energy (in eV) versus the first five principal quantum numbers in a hydrogen atom. 2 marks · Drawing
- Q63 An inductor-resistor circuit (LR) series circuit connected to an alternating current (a.c.) source of 220 V, 50 Hz, the resistor… 2 marks · Numerical
- Q64 The graph here shows a variation of $I_{rms}$ with angular frequency ‘$\omega$’ for two different LCR circuits. Which of the two… 2 marks · Short answer
- Q65 Analyse the figures given below and mention the significance of electromagnetic waves in each case. 2 marks · Short answer
- Q66 A synchrotron uses a combination of solenoid and toroid to generate high magnetic fields. Charged particles like electrons and… 3 marks · Long answer
- Q67 Both students i.e. Student 1 and Student 2, had an intention of stargazing at night and knew that a telescope would be required… 3 marks · Long answer
- Q68 A student starts working on a problem on Gauss' theorem to calculate the flux and hence the electric field at a given point due… 3 marks · Long answer
- Q69 A student was given a frequency generator, a source, an inductor, a capacitor, a resistor and an ammeter. After connecting the… 3 marks · Long answer
- Q70 Nuclear binding energy is the energy required to separate an atomic nucleus into its constituent protons and neutrons, or… 3 marks · Long answer
- Q71 A circular coil of 20 turns and a radius of 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the… 3 marks · Long answer
- Q72 A toroid is a hollow non-conducting circular ring, on which a large number of turns of a conducting wire are closely wound. If a… 3 marks · Fill in
- Q73 An electron emitted by a heated cathode and accelerated through a potential difference of 2 kV, enters a region with a uniform… 3 marks · Long answer
- Q74 In the figure, the straight wire AB is fixed while the loop PQRS is free to move. Give a reason for your response in each… 3 marks · Long answer
- Q75 The teacher is demonstrating the experiment of the focal length of a convex lens using the u-v method. After the teacher takes… 3 marks · Long answer
- Q76 For the given intensity versus phase difference graph of double-slit interference: If the graph depicts intensity versus phase… 3 marks · Long answer
- Q77 Based on the student's attempt to draw a ray diagram of a compound microscope: Identify two errors in the student's attempt to… 3 marks · Long answer
- Q78 For a science project, two fish tanks with lids were constructed as shown in the figure. Tank X has a lid with a convex shape… 3 marks · Numerical
- Q79 An alpha particle is made to move through two plates 10 cm apart. The speed with which it enters the gap in the first plate is… 3 marks · Long answer
- Q80 For the given electrical circuit, calculate the current through each branch using Kirchhoff's laws. 3 marks · Numerical
- Q81 The computer’s keyboards make use of capacitors at the base of their keys (as shown in the diagram). Each key is connected to a… 3 marks · Long answer
- Q82 Given two nuclei $_{29}\text{Cu}^{64}$ and $_{13}\text{Al}^{27}$. Calculate the ratio of the radii. What will be the ratio of… 3 marks · Long answer
- Q83 A graph showing the variation of binding energy per nucleon with mass number is given below. In the graph mark regions where… 3 marks · Drawing
- Q84 The energy of the thermal neutrons required for the fission of $^{235}\text{U}$ nuclei is of the order of 0.025 eV. However, the… 3 marks · Long answer
- Q85 The Lyman series spectrum of an atom contains wavelengths of 176.7 nm and 137.5 nm. The energy of the ground level of the atom is… 3 marks · Numerical
- Q86 Answer the following questions: Calculate the angular momentum of a ‘$\gamma$’ photon which is emitted when an electron jumps… 3 marks · Long answer
- Q87 An arc lamp takes 10 A at 50 V. Calculate the impedance of a choke of 1-ohm resistance to be connected in series with an arc lamp… 3 marks · Numerical
- Q88 Power Corporation of India wanted to transmit power of 11 kW from tower 1 to tower 2 at 220 V or 22000 V. Which of the two… 3 marks · Short answer
- Q89 Match the following conditions for an LCR series circuit with the corresponding phase relation between current and voltage: 3 marks · Match
- Q90 In an inductance-capacitance-resistance (LCR) series circuit, which is connected to an alternating current (a.c.) source of a… 3 marks · Long answer
- Q91 Electrostatic precipitators: Electrostatic precipitators are devices used to remove particles, such as dust and ash, from a… 5 marks · Long answer
- Q92 Student 1 and Student 2 conducted experiments using coherent sources of light, with Student 1 using a single slit and Student 2… 5 marks · Long answer
- Q93 A solar cell is a junction diode. A very thin layer of p-type semiconductor is grown on a relatively thicker n-type… 5 marks · Long answer
- Q94 A joint family stayed happily in a town. As a family, they watched the Asian games that took place in Hangzhou, China from… 5 marks · Case based
- Q95 The diagram depicts $\vec{v}$, $\vec{E}$ and $\vec{B}$ are mutually perpendicular. If direction of $\vec{E}$ is indicated with… 5 marks · Long answer