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ISC Class XII Board Exam 2026 : English Paper 1 (English Language)

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Anshuman Mishra
Aklavya School, Thengaithittu
10 19

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ALL INDIA ICSE PHYSICS TEACHER S MOCK TEST SERIES ---------------------------------------------------------------------------------------------------Maximum Marks: 70 Time Allowed: Three Hours (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) This paper is divided into four sections A, B, C and D. Answer all questions. Section A consists of one question having sub-parts of one mark each. Section B consists of seven questions of two marks each. Section C consists of nine questions of three marks each, and Section D consists of three questions of five marks each. Internal choices have been provided in two questions each in Section B, Section C and Section D. The intended marks for questions are given in brackets [ ]. All working, including rough work, should be done on the same sheet as and adjacent to the rest of the answer. Answers to sub parts of the same question must be given in one place only. A list of useful physical constants is given at the end of this paper. A simple scientific calculator without a programmable memory may be used for calculations. Section A 14 Marks Q.1. (A) Multiple Choice Questions. [7 Marks] (i) If 10 A of current is flowing through a circular coil of 200 turns and radius 7 cm. then the magnitude of the magnetic moment of the current loop (a) 25.5 J/T (c) 30.8 J/T (b) 30 J/T (d) 32 J/T (ii) The ratio of output frequency of half-wave rectifier and a full wave rectifier when an input frequency of 50 Hz is fed at input? (a) 1:2 1 (b) 2:1 (c) 4:1 (d) 1:4 (iii) The diagram below shows the equipotential surfaces in each region of space. The potential difference between any two consecutive surfaces is equal. There are five points marked in the space, namely A, B, C, D, and E as shown. Assertion (A): The electric field strength is greatest at point A and reduces from A to E. Reason (R): The potential difference in a region of space is equal to the negative electric field gradient in that region. (a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion. (b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion. (c) Assertion is true, and Reason is false. (d) Both Assertion and Reason are false. (iv) Which of the following graph correctly represents the variation of angle of deviation ( ) with angle of incidence (i) for light incident on a prism? (v) A metal rod of length 10 cm and a rectangular cross-section of 1 cm cm is connected to a battery across opposite faces. The resistance will be (a) maximum when the battery is connected across 1 cm cm (b) maximum when the battery is connected across 10 cm 1 cm (c) maximum when the battery is connected across 10 cm cm 2 (d) same irrespective of the three faces (vi) The magnetic induction at any point due to a long straight wire carrying a current is: (a) inversely proportional to the distance from the wire. (b) inversely proportional to the square of the distance from the wire. (c) does not depend on distance. (d) proportional to the distance from the wire. (vii) Assertion (A): The wave nature of matter is what prevents atoms from collapsing and gives atoms their sizes. Reason (R): Only those orbits where the circumference of the orbit is an integral multiple of de Broglie wavelength exist or are allowed. And it is not possible lower than the lowest orbit in an an atom. (a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion. (b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion. (c) Assertion is true, and Reason is false. (d) Both Assertion and Reason are false. Q.1. (B) Answer the following questions (i) (ii) (iii) [7 Marks] Calculate the wavelength of a photon needed to ionize a hydrogen atom. What is the shape of the wavefront generated by a point source? The following graph shows the variation of charge Q with voltage V, for two capacitors K and L. In which capacitor, more electrostatic energy is stored? 3 (iv) A light-emitting diode (LED) is connected in forward biasing. If its potential barrier is given by V0 when no biasing is there, as shown in the diagram, then draw the diagram showing the new position of potential barrier. (v) What is the value of magnetic field around a long straight current-carrying conductor? (vi) Two coils of wires A and B are placed mutually perpendicular. When a current is changed in any one coil, will the current induced in another coil? (vii) (a) Can a semiconductor behave like an insulator? (b) Specify the condition at which the semiconductor acts like insulator. SECTION B 14 MARKS Question 2 [2] A coil Q is connected to low voltage bulb B and placed near another coil P as shown in the figure. Give reasons to explain the following observations (i) The bulb B lights. (ii) Bulb gets dimmer, if the coil Qis moved towards left. Question 3 [2] Explain why the reactance offered by an inductor increases with increasing frequency of an alternating voltage? Also, sketch a graph between inductive reactance and frequency. OR 4 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 of the combination, in: (a) figure 1 (b) figure 2. Question 4 [2] 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 three charges are arranged in a straight line at an equal distance from each other. Calculate the ratio of Q to q for such an arrangement. Question 5 (i) [2] A long horizontal wire P carries a current of 50 A. It is rigidly fixed. Another wire Q is placed directly above and parallel to P as shown in figure below. The weight/length of wire Q is 0.025 Nm-1 and it carries a current of 25 A. Find the distance of wire Q from P, so that the wire Q remains at rest. Question 6 [2] Two cells of electromotive forces (e.m.f.s.) approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm. The student sets up the circuit as shown in the diagram. However, he is not able to measure the ratio of e.m.f.s correctly. Analyse the circuit shown and spot a minimum of two errors in the circuit. Explain with proper reasoning. 5 Question 7 [2] Draw a graph showing the variation of intensity versus the position on the screen in Young's double slit experiment when (i) both the slits are opened and (ii) one of the slit is closed Question 8 [2] A part of an electric circuit is shown below. Using Kirchhoff's law, find the current I through 4 resistor. SECTION C 27 MARKS Question 9 [3] 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 coil. If the current in the coil is 5 A, what will be: (a) the total torque on the coil? (b) the total force on the coil? (c) average force on each electron in the coil due to the magnetic field. (The coil is made of copper wire of a cross-sectional area of 10 5 m2 , and the free electron density in copper is given to be about 1029 m 3 ) 6 Question 10 [3] Use Lenz's law to determine the direction of induced current in the situations described by figure. (i) A wire of irregular shape turning into a circular shape. (ii) A circular loop being deformed into a narrow straight wire. Add OR Question 11 [3] Find expressions for force and torque on an electric dipole kept at an angle in a uniform electric field. Question 12 [3] Answer the following questions. (i) Why is the binding energy per nucleon found to be constant for nuclei in the range of mass number (A) lying between 30 and 170? (ii) When a heavy nucleus with mass number A=240 breaks into two nuclei, A=120 why energy is released in the process? Question 13 [3] (i) Draw a labelled diagram of astronomical telescope when the image is formed at near point. (ii) The focal lengths of objective lens and eyepiece of a refracting telescope are 100 cm and 4 cm respectively, then find the angular magnification of telescope, when the final image is formed at infinity. Question 14 [3] Derive Snell's law of refraction using Huygens' wave theory. 7 Question 15 [3] A cube of side b has a charge q at each of its vertices. Determine the potential and electric field due to this charge array at the center of the cube. Question 16 [3] Given two nuclei 29Cu64 and 13Al27. (a) Calculate the ratio of the radii. (b) What will be the ratio of their densities? (c) Compare their nuclear density to the density of water. Question 17 [3] A student starts working on a problem on Gauss' theorem to calculate the flux and hence the electric field at a given point due to a system of discreet charges. The teacher gives him certain instructions and the student responds to each instruction as per her understanding of the concept. State whether the student's response is correct or incorrect. Give a reason for your answer. (a) Examiner: Draw a Gaussian surface for the given system of charges. Student: Draws a symmetric surface passing through the point at which the electric field is to be calculated. (b) Examiner: Suggest a way to double the flux through the given surface. Student: Doubles the surface area of the Gaussian surface. (c) Examiner: Calculate the electric flux of a point charge of 2 C, placed 5 cm above the centre of a square plate of side 10 cm, through the given plate. Student: As the charge is not enclosed by the surface, the flux through the surface is zero. SECTION D 15 MARKS Question 18 [5] (i) (i) An alternating emf of 200V, 50Hz is applied to an L-R circuit, having a resistance R of 10 and an inductance L of 0 05H connected in series. Calculate: (1) Impedance. (2) Current flowing in the circuit. (ii) Draw a labelled graph showing the variation of inductive reactance (XL) verses frequency (f). OR 8 (i) (ii) What is LED? Explain its working and V-I characteristics with suitable diagram. What are advantages of LED over incandescent low power lamps? Question 19 (i) (ii) [5] What is the effect on the interference fringes of a Young's double slit experiment when (a) the width of the source slit is increased. (b) the monochromatic source is replaced by a source of white light. Justify your answer in each case. The intensity at the central maxima in Young's double slit experiment set-up is I0. Show that the intensity at a point, where the path difference is /3, is I0/4. R (i) (ii) When an alternating emf e = 310 sin (100 t)V is applied to a series LCR circuit, current flowing through it is i = 5 sin(100 t + /3)A. (1) What is the phase difference between the current and the emf? (2) Calculate the average power consumed by the circuit. Obtain an expression for the resonant frequency (fo) of a series LCR circuit. Question 20 Read the passage given below and answer the questions that follow. [5] A solar cell is a junction diode. A very thin layer of p-type semiconductor is grown on a relatively thicker n-type semiconductor, having a few finer electrodes on the top of the p-type semiconductor layer. These electrodes do not obstruct light from reaching the thin p-type layer. Just below the p-type layer, there is a p-n junction. We also provide a current-collecting electrode at the bottom of the n-type layer. Similarly, the holes in the depletion can quickly come to the p-type side of the junction. Once, the newly created free electrons come to the n-type side, cannot further cross the junction because of the barrier potential of the junction. Similarly, the newly created holes once come to the p-type side cannot further cross the junction because of the same barrier potential of the junction. As the concentration of electrons becomes higher on one side, the p-n junction will behave like a small battery cell. A voltage is set up which is known as photovoltage. If we connect a small load across the junction, there will be a tiny current flowing through it. The IV characteristic of solar cells is given below: 9 (a) Is the principle of a solar cell the same as that of a photodiode? (b) What is the suitable band gap of the semiconductors used as solar cell materials? (a) 0 to 0.5 eV (b) 0.5 to 1 eV (c) 1.1 to 2 eV (d) 0 to 0.8 eV (c) What does V0 represent in the characteristic curve? (d) Is Imax independent of the intensity of incident radiation? (e) Why do holes in the depletion region quickly come to the p-side? USEFUL CONSTANTS AND RELATIONS : 1. Planck's constant h = 6 63 10-34 Js 2. Speed of light in vacuum c = 3 108 ms-1 3. Charge of a proton = Charge of an electron e = + 1 6 10-19 C 4. Mass of an electron m = 9 1 10-31 Kg 5. Bohr radius ao = 5 3 10-11 m 6. Ionisation energy of hydrogen atom E = 13 6 eV 7. One electron volt 1 eV = 1 6 10-19 J 10 All India ICSE Physics Teachers (AIIPT) National Practice Mock Series 2025 Welcome to the All India ICSE Physics Teachers (AIIPT) National Practice Mock Series, a nation-wide initiative to strengthen conceptual understanding, application skills, and exam-readiness in Physics for ICSE Grade 10 and ISC Grade 12 students. This mock series is curated and coordinated by experienced Physics educators from across India, under the AIIPT collective, with the goal of helping every student experience real examination standards, improve problem-solving accuracy, and explore physics beyond textbooks. About the Mock Series Eligibility: ICSE Grade 10 , ISC Grade 12 & 10,12 CBSE students Subject Focus: Physics Conceptual Understanding | Numerical Problem Solving | Experimental Application Levels: o Level 1 Concept & Formula Mastery o Level 2 Numerical & Application-Based Mock Test o Level 3 Integrated Final Mock (Real Exam Pattern) Question Types: MCQs | Numerical | Graph | Assertion-Reason | Case-based | Experimental Inference Mode: Online (Google Form) / Offline (School Center under AIIPT Guidelines) Duration: 90 minutes (for Grade 10) | 120 minutes (for Grade 12) Marking: Based on current ICSE , ISC & CBSE board standards Objectives To help students build confidence through structured national-level practice. To provide teachers and schools with comparative analytics on conceptual strengths and gaps. To promote collaboration and excellence among Physics educators across India. Recognition & Certification E-Certificates will be issued to all participants. Top scorers will be featured on the AIIPT National Merit Board. Schools with outstanding participation will receive a Certificate of Academic Contribution. Organized By All India ICSE Physics Teachers (AIIPT) A collaborative platform for professional Physics educators across India, promoting innovation, excellence, and mentorship in science education. For Any Queries please scan the QRcode : AIIPT 11

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