CBSE Class 12 Physics Set 2 - (55/6/2) Question Paper 2025 is available for download here. CBSE conducted Class 12 Physics exam on February 21, 2025 from 10:30 AM to 1:30 PM. The Physics theory paper is of 70 marks, and the internal assessment is of 30 marks.
Also Check: CBSE Class 12 Question Paper 2025 (All Subjects)
The Physics question paper includes the following types of questions:
- MCQs: 1 mark each
- Very short-answer questions: 2 marks each
- Short-answer type questions: 3 marks each
- Case-study based questions: 4 marks each
- Long-answer type questions: 5 marks each
CBSE Class 12 Physics Set 2 - (55/6/2) Question Paper 2025 with Solution PDF
| CBSE Official PDF | CD PDF | CD PDF with Solutions |
|---|---|---|
| Download official PDF 1.92 MB | Download Collegedunia PDF 0.59 MB | Download solutions PDF 0.81 MB |
CBSE Class 12 Physics 2025 Set 2 (55/6/2) Questions with Solutions
A wire of resistance \(R\), connected to an ideal battery consumes a power \(P\). If the wire is gradually stretched to double its initial length, and connected across the same battery, the power consumed will be:
A vertically held bar magnet is dropped along the axis of a copper ring having a cut as shown in the diagram. The acceleration of the falling magnet is:
A straight conductor is carrying a current of 2 A in the \( +x \) direction along it. A uniform magnetic field \( \vec{B} = (0.6 \hat{j} + 0.8 \hat{k}) \) T is switched on in the region. The force acting on 10 cm length of the conductor is:
An ac source is connected to a resistor and an inductor in series. The voltage across the resistor and inductor are \(8\,\text{V}\) and \(6\,\text{V}\) respectively. The voltage of the source is:
A proton and an \(\alpha\)-particle enter with the same velocity \(\vec{V}\) in a uniform magnetic field \(\vec{B}\) such that \(\vec{V} \perp \vec{B}\). The ratio of the radii of their paths is:
Two coherent waves, each of intensity \(I_0\), produce interference pattern on a screen. The average intensity of light on the screen is:
If \(R_s\) and \(R_p\) are the equivalent resistances of \(n\) resistors, each of value \(R\), in series and parallel combinations respectively, then the value of \((R_s - R_p)\) is:
A galvanometer can be converted into an ammeter of desired range by connecting a:
Inside a nucleus, the nuclear forces between proton and proton, proton and neutron, neutron and neutron are \(F_{pp}\), \(F_{pn}\) and \(F_{nn}\) respectively. Then:
The de Broglie wavelength associated with an electron moving with energy 5 eV is:
A piece of a diamagnetic material, free to move when placed in a uniform magnetic field:
The momentum (in kg·m/s) of a photon of frequency \( 6.0 \times 10^{14} \) Hz is:
Two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) as given below.
Assertion (A): A hole is an apparent free particle with effective positive electronic charge.
Reason (R): A hole is not necessarily a vacancy left behind by an electron in the valence band.
Two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) as given below.
Assertion (A): In a reflecting telescope, the image does not have chromatic aberration.
Reason (R): Chromatic aberration occurs only due to refraction of light through an optical medium.
Two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) as given below.
Assertion (A): The binding energy per nucleon is practically constant for mass number in the range \( 30<A<170 \).
Reason (R): Nuclear forces between the nucleons for mass numbers in the range \( 30<A<170 \) are not short-range.
Two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) as given below.
Assertion (A): X-rays are produced when slow moving electrons are stopped by a metal target of high atomic number.
Reason (R): X-rays consist of low-energy photons.
A cell of emf \(E\) and internal resistance \(r\) is connected to an external variable resistance \(R\). Plot a graph showing the variation of terminal voltage \(V\) of the cell as a function of current \(I\), supplied by the cell. Explain how the emf of the cell and its internal resistance can be found from it.
In an \(n\)-type semiconductor electron-hole combination is a continuous process at room temperature. Yet the electron concentration is always greater than the hole concentration in it. Explain.
A laser beam of wavelength \(500\,\text{nm}\) and power \(5\,\text{mW}\) strikes normally on a perfectly reflecting surface of area \(1\,\text{mm}^2\) of a body. It rebounds back from the surface. Find the force exerted by the laser beam on the body.
A ray of light is incident on face AB of a prism ABC with angle of prism \( A \) and emerges out from face AC. The prism is set in the position of minimum deviation with angle of deviation \( \delta \). Find (i) the angle of incidence and (ii) the angle of refraction on face AB.
Find the intensity at a point on the screen in Young's double slit experiment, at which the interfering waves of intensity \(I_0\) each, have a path difference of (i) \(\dfrac{\lambda}{4}\) and (ii) \(\dfrac{\lambda}{3}\).
A point source of light in air is kept at a distance of \(12\,\text{cm}\) in front of a convex spherical surface of glass of refractive index \(1{\cdot}5\) and radius of curvature \(30\,\text{cm}\). Find the nature and position of the image formed.
(a) Define the term 'drift velocity' of conduction electrons in a conductor.
(b) A conductor of length \(l\) and area of cross-section \(A\) is connected across an ideal battery of emf \(V\). Derive the formula for the current density in terms of relaxation time \(\tau\).
State Lenz's law. A rod \(MN\) of length \(L\) is rotated about an axis passing through its end \(M\) perpendicular to its length, with a constant angular velocity \(\vec{\omega}\) in a uniform magnetic field \(\vec{B}\) parallel to the axis. Obtain an expression for emf induced between its ends.
Define 'self-inductance' of a coil. Derive an expression for self-inductance of a long solenoid of cross-sectional area \(A\) and length \(l\), having \(n\) turns per unit length.
A ray of light is incident at an angle \(i\) on a parallel sided glass slab of thickness '\(d\)' and gets refracted into the slab at angle \(r\). Draw a ray diagram to show its path as it emerges out of the slab. Hence, obtain an expression for the lateral shift of the ray. Under what condition will the shift be minimum?
Describe briefly Geiger-Marsden scattering experiment. Depict the graph showing the variation of number of scattered particles detected with the scattering angle. How did this graph lead to the discovery of the nucleus?
Find the \(Q\) value of the following nuclear reaction:
\({}_6^{12}\text{C} + {}_6^{12}\text{C} \longrightarrow {}_{10}^{20}\text{Ne} + {}_2^{4}\text{He}\)
Is this reaction exothermic or endothermic ?
Given: \(m({}_6^{12}\text{C}) = 12.000000\ \text{u}\), \(m({}_{10}^{20}\text{Ne}) = 19.992439\ \text{u}\), \(m({}_2^{4}\text{He}) = 4.002603\ \text{u}\), \(1\ \text{u} = 931\ \text{MeV}/c^2\)
A rectangular loop carries a current of \(1\,\text{A}\). A straight long wire carrying \(2\,\text{A}\) current is kept near the loop in the same plane as shown in the figure.
Find:
(i) the torque acting on the loop, and
(ii) the magnitude and direction of the net force on the loop.
Name the electromagnetic wave used (i) in radar, (ii) in eye surgery and (iii) as diagnostic tool in medicine. Write their wavelength range also.
Comprehension:
Case Study (Extrinsic Semiconductors): Extrinsic semiconductors are made by doping pure or intrinsic semiconductors with suitable impurity. There are two type of dopants used in doping, Si or Ge, and using them p-type and n-type semiconductors can be obtained. A p-n junction is the basic building block of many semiconductor devices. Two important processes occur during the formation of a p-n junction: diffusion and drift. When such a junction
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is formed, a 'depletion layer' is created consisting of immobile ion-cores. This is responsible for a junction potential barrier. The width of a depletion layer and the height of potential barrier changes when a junction is forward-biased or reverse-biased. A semiconductor diode is basically a p-n junction with metallic contacts provided at the ends for application of an external voltage. Using diodes, alternating voltages can be rectified.(i) Which of the following is a donor impurity atom for Ge?
When a pentavalent atom occupies the position of an atom in the crystal lattice of Si, four of its electrons form covalent bonds with four silicon neighbours, while the fifth remains bound to the parent atom. The energy required to set this electron free is about:
During formation of a p-n junction:
(iv) (a) In reverse-biased p-n junction:
(A) the drift current is of the order of few mA.
(B) the applied voltage mostly drops across the depletion region.
(C) the depletion region width decreases.
(D) the current increases with increase in applied voltage.
OR
(b) The output frequency of a full-wave rectifier with \(50\,\text{Hz}\) as input frequency is:
Comprehension:
Case Study (Capacitors): A capacitor is a system of two conductors separated by an insulator. In practice, the two conductors have charges \(Q\) and \(-Q\) with potential difference \(V = V_1 - V_2\) between them. The ratio \(\dfrac{Q}{V}\) is a constant, denoted by \(C\) and is called the capacitance of the capacitor. It is independent of \(Q\) or \(V\). It depends only on the geometrical configuration (shape, size, separation) of the two conductors and the medium separating the conductors. When a parallel plate capacitor is charged, the electric field \(E_0\) is localised between the plates and is uniform
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throughout. When a slab of a dielectric is inserted between the charged plates (charge density \(\sigma\)), the dielectric is polarised by the field. Consequently opposite charges appear on the faces of the slab, near the plates, with surface charge density of magnitude \(\sigma_p\). For a linear dielectric \(\sigma_p\) is proportional to \(\vec{E}_0\). Introduction of a dielectric changes the electric field, and hence, the capacitance of a capacitor, and hence, the energy stored in the capacitor. Like resistors, capacitors can also be arranged in series or in parallel or in a combination of series and parallel.(i) Consider a capacitor of capacitance \(C\), with plate area \(A\) and plate separation \(d\), filled with air [Fig. (a)]. The distance between the plates is increased to \(2d\) and one of the plates is shifted as shown in Fig. (b). The capacitance of the new system now is:
A slab (area \(A\) and thickness \(d_1\)) of a linear dielectric of dielectric constant \(K\) is inserted between charged plates (charge density \(\sigma\)) of a parallel plate capacitor [plate area \(A\) and plate separation \(d\,(\gt d_1)\)] and opposite charges with charge density of magnitude \(\sigma_p\) appear on the faces of the slab. The dielectric constant \(K\) is given by:
An electric field \( E \) is established between the plates of an air-filled parallel plate capacitor, with charges \( Q \) and \( -Q \). \( V \) is the volume of the space enclosed between the plates. The energy stored in the capacitor is:
(iv) (a) Three capacitors \(A\), \(B\) and \(M\), each of capacitance \(C\) are connected to a capacitor \(N\) of capacitance \(2C\) and a battery as shown in the figure. If the charges on \(A\) and \(N\) are \(Q\) and \(Q'\) respectively, then \(\dfrac{Q'}{Q}\) is:
OR
(b) A slab (area \(A\) and thickness \(\dfrac{d}{2}\)) of dielectric constant \(K\) is inserted in a parallel plate capacitor of plate area \(A\) and plate separation \(d\). If \(C\) and \(C_0\) are the capacitances of the capacitors with and without the dielectric, then \(\dfrac{C}{C_0}\) is:
In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. The eyepiece has a focal length of 5 cm. The final image is formed at infinity. Calculate the distance between the objective and the eyepiece.
Using Huygens’ principle, explain the refraction of a plane wavefront, propagating in air, at a plane interface between air and glass. Hence verify Snell’s law.
(i) The electric field in a region is given by \(\vec{E} = 40x\,\hat{i}\,\text{N/C}\). Find the amount of work done in taking a unit positive charge from a point \((0, 3\,\text{m})\) to the point \((5\,\text{m}, 0)\).
(ii) A charge \(Q\) is distributed over two concentric hollow spheres of radii \(r\) and \(R\,(\gt r)\) such that their surface charge densities are equal. Find:
(I) the electric field, and
(II) the potential
at their common centre.
(i) Obtain an expression for the electric field \(\vec{E}\) due to a dipole of dipole moment \(\vec{p}\) at a point on its equatorial plane and specify its direction. Hence, find the value of electric field:
(I) at the centre of the dipole \((r = 0)\), and
(II) at a point \(r \gg a\),
where \(2a\) is the length of the dipole.
(ii) An electric field \(\vec{E} = (10x + 5)\,\hat{i}\,\text{N/C}\) exists in a region in which a cube of side \(L\) is kept as shown in the figure. Here \(x\) and \(L\) are in metres. Calculate the net flux through the cube.
(i) Write the principle of working of an ac generator. Draw its labelled diagram and explain its working.
(ii) A resistor of \(400\,\Omega\), an inductor of \(\left(\dfrac{2}{\pi}\right)\text{H}\) and a capacitor of \(\left(\dfrac{50}{\pi}\right)\,\mu\text{F}\) are joined in series across an ac source \(v = 140\sin(100\pi)t\,\text{V}\). Find the rms voltages across these three circuit elements. The algebraic sum of these voltages is more than the rms voltage of source. Explain.
(i) Write the principle of working of a transformer. With the help of a labelled diagram, explain the working of a step-up transformer.
(ii) An ideal transformer is designed to convert \(50\,\text{V}\) into \(250\,\text{V}\). It draws \(200\,\text{W}\) power from an ac source whose instantaneous voltage is given by \(v_i = 20\sin(100\pi)t\,\text{V}\).
Find:
(I) rms value of input current.
(II) expression for instantaneous output voltage.
(III) expression for instantaneous output current.
CBSE Class 12 Physics Question Paper Pattern 2025
The CBSE Class 12 Physics 2025 question paper is of 70 marks and has 33 questions in five sections, A to E, all compulsory, with internal choice in some questions of Sections B to E. The time allowed is 3 hours, with 15 minutes of extra reading time. The table below gives the section-wise paper pattern from the official CBSE question paper.
| Section | Questions | Question Type | Marks per Question | Marks |
|---|---|---|---|---|
| A | Q1 - Q16 | Multiple choice questions | 1 | 16 |
| B | Q17 - Q21 | Very short answer questions | 2 | 10 |
| C | Q22 - Q28 | Short answer questions | 3 | 21 |
| D | Q29 - Q30 | Case study-based questions | 4 | 8 |
| E | Q31 - Q33 | Long answer questions | 5 | 15 |
| Total | 33 questions | 70 |
CBSE Class 12 Physics Unit-Wise Topics with Marks Distribution
| Unit No. | Unit Name | Chapters | Allotted Marks |
|---|---|---|---|
| Unit 1 | Electrostatics | Electric Charges and Fields | 16 |
| Electrostatic Potential and Capacitance | |||
| Unit 2 | Current Electricity | Current Electricity | |
| Unit 3 | Magnetic Effects of Current and Magnetism | Moving Charges and Magnetism | 17 |
| Magnetism and Matter | |||
| Unit 4 | Electromagnetic Induction and Alternating Current | Electromagnetic Induction | |
| Alternating Current | |||
| Unit 5 | Electromagnetic Waves | Electromagnetic Waves | 18 |
| Unit 6 | Optics | Ray Optics and Optical Instruments | |
| Wave Optics | |||
| Unit 7 | Dual Nature of Radiation and Matter | Dual Nature of Radiation and Matter | 12 |
| Unit 8 | Atoms and Nuclei | Atoms | |
| Nuclei | |||
| Unit 9 | Electronic Devices | Semiconductor Electronics: Materials, Devices, and Simple Circuits | 07 |
| Total | 70 | ||
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