ISC Physics 2026 Improvement Paper with Answers
All 39 questions of the ISC Physics 2026 Improvement Paper, in printed order. Open a question to read it in full and see its answer.
- Q1(A)(i) A positively charged honeybee ($q_{1} = +4e$) is attracted towards a flower pollen ($q_{2} = -6e$). When the bee is… 1 mark · MCQ
- Q1(A)(ii) Three long parallel straight wires, X, Y and Z, are equally separated and placed in the same plane in a vacuum. They carry a… 1 mark · MCQ
- Q1(A)(iii) If the wavelength of electromagnetic (em) radiation is equal to the de Broglie wavelength ($\lambda$) of an electron moving with… 1 mark · MCQ
- Q1(A)(iv) If the magnetic susceptibility of a certain magnetic material is 0.0001, what is its relative permeability? 1 mark · MCQ
- Q1(A)(v) Which one of the following statements is true for the width of the depletion region of a semi-conductor diode? 1 mark · MCQ
- Q1(A)(vi) A microscope is focused on a mark at the bottom of a beaker. Water having refractive index of $\frac{4}{3}$ is poured into the… 1 mark · MCQ
- Q1(A)(vii) When exposed to sunlight, a thin film of oil on water exhibits bright colours. Given below are two statements marked, Assertion… 1 mark · Assertion-reason
- Q1(B)(i) How much work is done in carrying a charge 'q' along a circular arc, at the centre of which there is a fixed point charge 'Q'? 1 mark · Numerical
- Q1(B)(ii) Explain why the efficiency of a transformer is always less than 100%. 1 mark · Short answer
- Q1(B)(iii) What type of wavefront is associated with sunlight? 1 mark · Short answer
- Q1(B)(iv) State any one difference between a primary rainbow and a secondary rainbow. 1 mark · Short answer
- Q1(B)(v) What are matter waves? 1 mark · Short answer
- Q1(B)(vi) State any one postulate of Bohr’s theory of hydrogen atom. 1 mark · Short answer
- Q1(B)(vii) Name an element that is used as a dopant to convert an intrinsic semiconductor to a 'p' type semiconductor. 1 mark · One word
- Q2(i) You are provided with three identical capacitors, each of capacitance $12\ \mu\text{F}$. Calculate the range (minimum to maximum)… 2 marks · Numerical
- Q2(ii) Answer the following questions: An electric dipole having dipole moment 'p' is kept in a uniform electric field E, with its axis… 2 marks · Short answer
- Q3(i) Two bulbs $B_{1}$ and $B_{2}$ having ratings (100W, 220V) and (200W, 220V) are connected in series to a 220V supply. Perform… 2 marks · Numerical
- Q3(ii) Answer the following questions: Many identical cells, each of an emf of 1.5V and an internal resistance of $2\Omega$, are… 2 marks · Short answer
- Q4 Figure 2 below shows a circuit which is used to measure resistance of a piece of metallic wire X. Write the mathematical formula… 2 marks · Short answer
- Q5 Sketch a labelled graph showing variation of impedance Z of a series LCR circuit with the frequency f of an ac supply. Mark the… 2 marks · Drawing
- Q6 Calculate the position of an object to be placed in front of a convex lens having focal length of 5cm to obtain an image which is… 2 marks · Numerical
- Q7 With reference to the image of a cash counting machine shown below, answer the questions that follow. Name the electromagnetic… 2 marks · Short answer
- Q8 In an experiment on photoelectric effect, frequency of incident monochromatic light is increased. What is its effect on… 2 marks · Short answer
- Q9 Show that the intensity of electric field at a point on broadside position of an electric dipole is given by… 3 marks · Derivation
- Q10(i) Using Kirchhoff’s laws of electric network, calculate the current flowing through the $5\Omega$ resistor shown in Figure 3 below. 3 marks · Numerical
- Q10(ii) Figure 4 below shows a uniform metallic wire AB which is 1m long. It has a resistance of $15\Omega$. It is connected in series… 3 marks · Numerical
- Q11 Using Ampere's circuital law, obtain an expression for magnetic flux density of the magnetic field at a point near a long… 3 marks · Derivation
- Q12(i) Answer the following questions: The north pole of a magnet is brought near a metallic ring R as shown in Figure 5 below. Mark the… 3 marks · Short answer
- Q12(ii) Answer the following questions: Mention any one factor on which current sensitivity of a moving coil galvanometer depends. Define… 3 marks · Short answer
- Q13 Consider two thin lenses, M and N having focal lengths of $f_{1}$ and $f_{2}$, respectively. They are kept in contact with each… 3 marks · Derivation
- Q14 Answer the following questions: A compound microscope has a magnifying power of 30. The focal length of its eye piece is 5cm. If… 3 marks · Short answer
- Q15 Figure 7 below illustrates Young’s double-slit experiment. $S_{1}$ and $S_{2}$ are coherent sources emitting light of wavelength… 3 marks · Short answer
- Q16 Answer the following questions with reference to Fraunhofer diffraction: Why does violet light produce a narrower diffraction… 3 marks · Short answer
- Q17 The graph below shows the variation of photoelectric current (I) with the applied voltage (V). What does $-4\text{V}$ on the… 3 marks · Short answer
- Q18(i) Answer the following questions: The continuous graph below shows variation of emf versus time when applied to a component X. The… 5 marks · Long answer
- Q18(ii) Answer the following questions: A train is moving on horizontal tracks 1.2m apart with a constant velocity of 36 km/hr. Vertical… 5 marks · Long answer
- Q19(i) Answer either subparts (i) to (iv) or (v) to (viii). Draw a labelled circuit diagram of a semiconductor diode when it is forward… 5 marks · Long answer
- Q19(ii) Answer the following questions: What is the effect of increasing the temperature on conductivity of an intrinsic semiconductor?… 5 marks · Long answer
- Q20 In a panel discussion on Atomic and Nuclear Physics, one of the panelists explained the discovery of electrons by Sir J. J… 5 marks · Case based