ISC Physics 2027 Specimen Paper with Answers
All 39 questions of the ISC Physics 2027 Specimen Paper, in printed order. Open a question to read it in full and see its answer.
- Q1(A)(i) A point charge $-Q$ and three points A, B and C are shown in Figure 1 below. If V is electric potential and E is electric field… 1 mark · MCQ
- Q1(A)(ii) Select the odd one out from the following options: 1 mark · MCQ
- Q1(A)(iii) In Figure 2 below, CD is an infinitely long and straight metallic wire carrying a current I. Point P is at a perpendicular… 1 mark · MCQ
- Q1(A)(iv) Match the entries in Column I with those in Column II: Column I Column II 1. Planck A. Hydrogen spectrum 2. Einstein B. Wave… 1 mark · MCQ
- Q1(A)(v) Identify the phenomena that occur when a P-N junction diode is forward biased: (P) The width of the depletion layer decreases… 1 mark · MCQ
- Q1(A)(vi) In an astronomical telescope of refracting type, 1 mark · MCQ
- Q1(A)(vii) The focal length of a convex mirror will increase, if the mirror is placed in water. 1 mark · Assertion-reason
- Q1(B)(i) Two point charges $Q_1$ and $Q_2$, separated by a distance, are such that there is no neutral point (where electric field is… 1 mark · Short answer
- Q1(B)(ii) Compare resistance of an ideal voltmeter with that of an ideal ammeter. 1 mark · Short answer
- Q1(B)(iii) How can the focal length of a given convex lens be measured in Physics laboratory using only a metre scale? 1 mark · Short answer
- Q1(B)(iv) What is the difference between a moving metallic ball colliding with another ball in motion and a photon colliding with an… 1 mark · Short answer
- Q1(B)(v) When can a gamma ray photon produce a proton and an antiproton pair? 1 mark · Short answer
- Q1(B)(vi) Explain why resistance of a semiconductor material decreases when its temperature is increased. 1 mark · Short answer
- Q1(B)(vii) Fill in the blank with an appropriate term from the bracket: When a light wave travels from one medium to another, its ________… 1 mark · Fill in
- Q2(i) A negatively charged thundercloud above the earth’s surface may be perceived as a parallel plate capacitor. Its capacitance is… 2 marks · Numerical
- Q2(ii) A tiny bird carrying a charge of $q = 8 \times 10^{-17}\text{ C}$ dives vertically down towards a large positively charged… 2 marks · Numerical
- Q3 Draw a labelled diagram of an arrangement used in Physics laboratory to compare emfs of two given cells X and Y. 2 marks · Drawing
- Q4(i) According to Ohm’s law, $V = IR$, so if potential difference (V) between the two ends of a metallic conductor is decreased, then… 2 marks · Short answer
- Q4(ii) Heating power developed in a resistor R is given by $P = \frac{V^2}{R}$. This implies that the heating power is inversely… 2 marks · Short answer
- Q5 Explain why a blue coloured spark appears in a switch contact when a circuit containing a load like a heater, geyser or iron is… 2 marks · Short answer
- Q6 There are seven types of electromagnetic waves having different frequency ranges. Arrange them in the increasing order of their… 2 marks · Short answer
- Q7 Answer the following questions: Why the current flowing is extremely small during reverse biasing of a junction diode? State the… 2 marks · Short answer
- Q8 Two particles A and B of masses $m_A$ and $m_B$ have de Broglie wavelength $\lambda_A$ and $\lambda_B$. If… 2 marks · Numerical
- Q9(i) Obtain an expression of intensity of electric field at a point lying on the axis of an electric dipole. (End on position / axial… 3 marks · Derivation
- Q9(ii) Obtain an expression for capacitance of a parallel plate capacitor having dielectric slab of thickness t between its plates… 3 marks · Derivation
- Q10(i) Three identical cells each of emf $1\cdot5\text{V}$ and internal resistance of $2\,\Omega$ are connected in series to form a… 3 marks · Numerical
- Q10(ii) In the circuit shown in Figure 5 below, the central zero galvanometer G shows no deflection when the key K is closed. Calculate… 3 marks · Numerical
- Q11 An alpha particle is moving with a velocity v. It enters a uniform magnetic field (B) as shown in Figure 6 below. The magnetic… 3 marks · Short answer
- Q12 Answer the following questions: State any one difference between the nature of magnetic field inside a current carrying solenoid… 3 marks · Short answer
- Q13 A physics teacher drew a ray diagram on the board as shown in Figure 8 below and asked the following questions to the students… 3 marks · Short answer
- Q14 A student uses two prisms, A and B, made of different materials but having the same prism angle ($60^\circ$). Prism Minimum… 3 marks · Numerical
- Q15 Answer the following questions: An equiconvex lens forms a full size magnified image of a candle flame on a screen. How will this… 3 marks · Short answer
- Q16 Study the images shown in Figure 9 below carefully and answer the questions that follow. (All three surfaces have same work… 3 marks · Short answer
- Q17 Answer the following questions: What is a solar cell? Explain its working in brief. In an energy band diagram of a certain… 3 marks · Short answer
- Q18(i) Answer the following questions: The graph below shows variation of current (I) flowing through an electrical device with time… 5 marks · Long answer
- Q18(ii) An ac generator generating an emf $e = 300 \sin(100\pi t)\text{V}$ is connected to a $100\,\Omega$ resistor. Draw a labelled… 5 marks · Long answer
- Q19(i) Answer the following questions: Write Bohr’s equations for circular motion of an electron around the nucleus and conservation of… 5 marks · Long answer
- Q19(ii) Answer the following questions: Assuming that nuclei are spherical in shape, whose radius R is given by $R = R_0 A^{1/3}$ where… 5 marks · Long answer
- Q20 An innovative optical sensor system for a miniature drone incorporates a combination of various optical elements. A beam of light… 5 marks · Case based