ISC Physics 2023 Question Paper with Answers
All 39 questions of the ISC Physics 2023 Question Paper, in printed order. Open a question to read it in full and see its answer.
- Q1(A)(i) A hollow sphere of radius $R$ has a point charge $Q$ at its centre. Electric flux emanating from it is $\phi$. If both the charge… 1 mark · MCQ
- Q1(A)(ii) An electric current ($I$) flowing through a metallic wire is gradually increased. The graph of heating power ($P$) developed in… 1 mark · MCQ
- Q1(A)(iii) A circular coil has radius '$r$', number of turns '$N$' and carries a current '$I$'. Magnetic flux density '$B$' at its centre is: 1 mark · MCQ
- Q1(A)(iv) If an object is placed at a distance of $10\text{ cm}$ in front of a concave mirror of focal length $20\text{ cm}$, the image… 1 mark · MCQ
- Q1(A)(v) What type of wavefronts are associated with a source at infinity? 1 mark · MCQ
- Q1(A)(vi) Matter waves are: 1 mark · MCQ
- Q1(A)(vii) With an increase in the temperature, electrical conductivity of a semiconductor: 1 mark · MCQ
- Q1(B)(i) What is meant by an equipotential surface? 1 mark · Short answer
- Q1(B)(ii) In case of metals, what is the relation between current density ($J$), electrical conductivity ($\sigma$) and electric field… 1 mark · Short answer
- Q1(B)(iii) What is meant by “Motional emf”? 1 mark · Short answer
- Q1(B)(iv) What is meant by a microscope in normal use? 1 mark · Short answer
- Q1(B)(v) In a single slit Fraunhofer diffraction experiment, how does the angular width of central maximum change when the slit width is… 1 mark · Short answer
- Q1(B)(vi) Name the type of nuclear reaction that takes place in the core of the Sun. 1 mark · Short answer
- Q1(B)(vii) What type of semiconductor is obtained when a crystal of silicon is doped with a trivalent element? 1 mark · Short answer
- Q2(i) Calculate equivalent capacitance of the circuit shown in Figure 1 given below: 2 marks · Numerical
- Q2(ii) Calculate electric potential at a point P which is at a distance of $9\text{ cm}$ from a point charge of $50\mu\text{C}$. 2 marks · Numerical
- Q3 Write balancing condition of a Wheatstone bridge. Current ‘$I$’ flowing through a metallic wire is related to drift speed $v_d$… 2 marks · Short answer
- Q4 When an electric current is passed through a wire or a coil, a magnetic field is produced. Is the reverse phenomenon possible… 2 marks · Short answer
- Q5(i) A long straight wire AB carries a current of $5\text{ A}$. P is a proton travelling with a velocity of… 2 marks · Numerical
- Q5(ii) A moving coil galvanometer of resistance $55\,\Omega$ produces a full scale deflection for a current of $250\text{ mA}$. How will… 2 marks · Numerical
- Q6 State how vectors $\vec{E}$, $\vec{B}$ and $\vec{c}$ are oriented in an electromagnetic wave. Name the electromagnetic wave /… 2 marks · Short answer
- Q7 Name any two phenomena which take place in the formation of a rainbow. 2 marks · Short answer
- Q8 With reference to semiconductor physics, answer the following questions. What is meant by “Forbidden band” of energy levels? In… 2 marks · Short answer
- Q9 Show that intensity of electric field at a point in broadside position of an electric dipole is given by… 3 marks · Derivation
- Q10(i) Eight identical cells, each of emf $2\text{ V}$ and internal resistance $3\,\Omega$, are connected in series to form a row. Six… 3 marks · Numerical
- Q10(ii) In the circuit shown in Figure 3 below, $E_1$ and $E_2$ are batteries having emfs of $25\text{ V}$ and $26\text{ V}$. They have… 3 marks · Numerical
- Q11 Using Ampere’s circuital law, obtain an expression for magnetic flux density ‘$B$’ at a point near an infinitely long and… 3 marks · Derivation
- Q12 Using Huygen’s wave theory of light, show that the angle of incidence is equal to the angle of reflection. Draw a neat and… 3 marks · Derivation
- Q13(i) For any prism, obtain a relation between angle of the prism ($A$), angle of minimum deviation ($\delta_m$) and refractive index… 3 marks · Derivation
- Q13(ii) Obtain an expression for refraction at a single convex spherical surface i.e., the relation between $\mu_1$ (rarer medium)… 3 marks · Derivation
- Q14 What is the essential condition for obtaining a sustained interference? In Young’s double slit experiment, the distance of the… 3 marks · Short answer
- Q15 Monochromatic light of wavelength $396\text{ nm}$ is incident on the surface of a metal whose work function is… 3 marks · Numerical
- Q16 Name any two essential parts of a nuclear reactor. State the function of any one of them. 3 marks · Short answer
- Q17 Draw a labelled circuit diagram of a full wave rectifier. Show graphically how the output voltage varies with time. 3 marks · Drawing
- Q18(i) A $60\,\Omega$ resistor, a $1\cdot0\text{ H}$ inductor and a $4\mu\text{F}$ capacitor are connected in series to an ac supply… 5 marks · Numerical
- Q18(ii) An ac generator generates an emf which is given by $e = 311\sin(240\pi t)\text{ V}$. Calculate: (1) frequency of the emf. (2)… 5 marks · Numerical
- Q19(i) Name the series of lines of hydrogen spectrum which lies in the (1) ultraviolet region. (2) visible region. How much is the… 5 marks · Short answer
- Q19(ii) Using Bohr’s Theory of hydrogen atom, obtain an expression for the velocity of an electron in $n^{\text{th}}$ orbit of an atom… 5 marks · Derivation
- Q20 There are two types of lenses: Converging lenses and Diverging lenses, depending on whether they converge or diverge an incident… 5 marks · Case based