Class 12 Physics Sample Paper 2023
Class 12 Physics Sample Paper 2023: Physics has always been the core of Science whether you take PCM or PCB. This subject plays an essential role in upgrading your overall percentage. Often students think of physics as one of the toughest subjects of all but if you are familiar with the basic concepts then I assure you that cracking the board exams would be a cakewalk for you. So students have a good understanding of the concepts and practice with the help of sample Papers. Central Board of Secondary Education has released the official Physics Sample Paper Class 12 exam along with the other subject sample papers on www.cbseacademic.nic.in. All students are advised to pull their socks up to score well in the board exams. The Class 12 Physics Sample Paper would be of great help in practicing as per the revised exam pattern. In this article, we have provided direct links for downloading Physics Sample Paper.
Physics Sample Paper Class 12 Exam 2023
This academic year 2022-23, CBSE had planned to take the exams annually. There will be 35 questions in all. The paper consists of a total of five sections, that is, Section A, Section B, Section C, Section D, and Section E. The pattern of the paper is as follows-
- Section A contains 18 Questions for 1 Mark each.[Multiple Choice Questions].
- Section B contains 7 Questions for 2 Marks each.[Very Short Answer Questions].
- Section C contains 5 Questions for 3 Marks each.[Short Answer Questions].
- Section D contains 3 Questions for 5 Marks each.[Long Answer Questions].
- Section E contains 2 Questions for 4 Marks each. [Case Based Question].
Physics Class 12 Answer Key 2023- Click to Check
Physics Class 12 Sample Paper 2023
The students preparing for CBSE Class 12 Physics Exam must download the official sample paper PDF from the below link and practice the questions as per the pattern released by CBSE. The solutions to the CBSE Class 12 Physics Sample Paper as set by CBSE Class 12 Physics Syllabus 2022-23 have been provided below along with the solution as released by CBSE-
|Class 12 Physics Sample Paper with Solutions 2023|
|Class 12 Physics Sample Paper 2023 [Official]||Solution Link|
CBSE Class 12 Physics Syllabus 2022-23- Click to Check
Class 12 Physics Sample Paper and Solution 2023
In the below section, we have provided you with some important questions as per the new exam pattern. Do go through these Class 12 Physics Questions for 2023 and excel on your preparation done so far. The paper consists of a total of five sections, that is, Section A, Section B, Section C, Section D, and Section E. The pattern of the paper is as follows, Section A, Section B, Section C, Section D, Section E.
Question 1: According to Coulomb's law, which is the correct relation for the following figure?
(i) q1 q2> 0 (ii) q1 q2<0 (iii) q1 q2 =0 (iv) 1> q1/ q2 > 0
Solution: (ii) q1q2<0
Question 2: The electric potential on the axis of an electric dipole at a distance ‘r from its center is V. Then the potential at a point at the same distance on its equatorial line will be : (i) 2V (ii) -V (iii) V/2 (iv) Zero
Solution: (iv) zero
Question 3: The temperature (T) dependence of resistivity of materials A and material B is represented by fig (i) and fig (ii) respectively. Identify material A and material B.
(i) material A is copper and material B is germanium (ii) material A is germanium and material B is copper (iii) material A is nichrome and material B is germanium (iv) material A is copper and material B is nichrome
Solution: (ii) material A is germanium and material B is copper
Question 4: Two concentric and coplanar circular loops P and Q have their radii in the ratio 2:3. Loop Q carries a current 9 A in the anticlockwise direction. For the magnetic field to be zero at the common center, loop P must carry :
(i) 3A in the clockwise direction (ii) 9A in the clockwise direction (iii) 6 A in an anti-clockwise direction (iv) 6 A in the clockwise direction.
Solution: (iv) 6A in the clockwise direction
Question 5: A long straight wire of circular cross-section of radius a carries a steady current I. The current is uniformly distributed across its cross-section. The ratio of the magnitudes of the magnetic field at a point distant a/2 above the surface of the wire to that at a point distant a/2 below its surface is (i) 4 :1 (ii) 1:1 (iii) 4: 3 (iv) 3:4
Solution: (iii) 4:3
Question 6:If the magnetizing field on a ferromagnetic material is increased, its permeability (i) decreases (ii) increases (iii) remains unchanged (iv) first decreases and then increases
Solution: (i) decreases
Question 7: An iron-cored coil is connected in series with an electric bulb with an AC source as shown in the figure. When the iron piece is taken out of the coil, the brightness of the bulb will (i) decrease (ii) increase (iii) remain unaffected (iv) fluctuate
Solution: (ii) increase
Question 8: Which of the following statement is NOT true about the properties of electromagnetic waves? (I) These waves do not require any material medium for their propagation (ii) Both electric and magnetic field vectors attain the maxima and minima at the same time (iii) The energy in an electromagnetic wave is divided equally between electric and magnetic fields (iv) Both electric and magnetic field vectors are parallel to each other.
Solution: (iv) Both electric and magnetic field vectors are parallel to each other
Question 9: A rectangular, a square, a circular, and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity 𝑣⃗ = v𝚤̂.The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for (i) any of the four loops (ii) the circular and elliptical loops (iii) the rectangular, circular and elliptical loops (iv) only the elliptical loops.
Solution: (ii) the circular and elliptical loops
Question 10: In Young’s double slit experiment, the path difference at a certain point on the screen between two interfering waves is 𝟏/𝟖 th of the wavelength. The ratio of intensity at this point to that at the center of a bright fringe is close to (i) 0.80 (ii) 0.74 (iii) 0.94 (iv) 0.85
Solution: (iv) 0.85
Question 11: The work function for a metal surface is 4.14 eV. The threshold wavelength for this metal surface is: (i) 4125 Å (ii) 2062.5 Å (iii) 3000 Å (iv) 6000 Å
Solution: (iii) 3000 Å
Question 13: Which of the following statements about nuclear forces is not true? (i) The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometres. (ii) The nuclear force is much weaker than the Coulomb force. (iii) The force is attractive for distances larger than 0.8 FM and repulsive if they are separated by distances less than 0.8 FM. (iv) The nuclear force between neutron-neutron, proton-neutron, and proton-proton is approximately the same.
Solution: (ii) The nuclear force is much weaker than the Coulomb force.
Question 14: If the reading of the voltmeter V1 is 40 V, then the reading of voltmeter V2 is (i) 30 V (ii) 58 V (iii) 29 V (iv) 15 V.
Solution: (i) 30 V
Question 15:The electric potential V as a function of distance X is shown in the figure. The graph of the magnitude of electric field intensity E as a function of X is
Question 16:Two statements are given-one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c), and (d) as given below.
a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is NOT the correct explanation of A c) A is true but R is false d) A is false and R is also false ASSERTION(A): The electrical conductivity of a semiconductor increases on doping. REASON: Doping always increases the number of electrons in the semiconductor.
Solution: c) A is true but R is false
Question 17: Two statements are given-one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c), and (d) as given below.
a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is NOT the correct explanation of A c) A is true but R is false d) A is false and R is also false ASSERTION: In an interference pattern observed in Young's double slit experiment, if the separation (d) between coherent sources as well as the distance (D) of the screen from the coherent sources both are reduced to 1/3rd, then new fringe width remains the same. REASON: Fringe width is proportional to (d/D).
Solution: c) A is true but R is false
Question 18: Two statements are given-one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c), and (d) as given below.
a) Both A and R are true and R is the correct explanation of A b Both A and R are true and R is NOT the correct explanation of A c) A is true but R is false d) A is false and R is also false Assertion(A): The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies. Reason(R): The energy of electrons emitted from inside the metal surface, is lost in collision with the other atoms in the metal.
Solution: a) Both A and R are true and R is the correct explanation of A.
Question 19: Electromagnetic waves with wavelength (i) λ1 are suitable for radar systems used in aircraft navigation. (ii) λ2 is used to kill germs in water purifiers. (iii) λ3 is used to improve visibility in runways during fog and mist conditions. Identify and name the part of the electromagnetic spectrum to which these radiations belong. Also, arrange these wavelengths in ascending order of their magnitude.
Solution: λ1 -Microwave, λ2 - ultraviolet, λ3- infrared, Ascending order - λ2<λ3<λ1.
Question 20: A uniform magnetic field gets modified as shown in the figure when two specimens A and B are placed in it.
(i)Identify specimens A and B. (ii) How is the magnetic susceptibility of specimen A different from that of specimen B?
Solution: A - diamagnetic B- paramagnetic The magnetic susceptibility of A is small negative and that of B is a small positive.
Question 21: What is the nuclear radius of 125Fe, if that of 27 Al is 3.6 fermi?
The short wavelength limit for the Lyman series of the hydrogen spectrum is 913.4 A0. Calculate the short wavelength limit for the Balmer series of the hydrogen spectrum.
Question 22: A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Justify your answer.
Solution: The value of (µ – 1) is negative and ‘f’ will be negative. So it will behave like a diverging lens.
Question 23: The figure shows a piece of pure semiconductor S in series with a variable resistor R and a source of constant voltage V. Should the value of R be increased or decreased to keep the reading of the ammeter constant, when semiconductor S is heated? Justify your answer
The graph of the potential barrier versus the width of the depletion region for an unbiased diode is shown in graph A. In comparison to A, graphs B and C are obtained after biasing the diode in different ways. Identify the type of biasing in B and C and justify your answer.
Solution: To keep the reading of the ammeter constant value of R should be increased as with the increase in temperature of a semiconductor, its resistance decreases and current tends to increase.
B - reverse biased In the case of a reverse-biased diode the potential barrier becomes higher as the battery further raises the potential of the n side.
C -forward biased Due to the forward bias connection the potential of the P side is raised and hence the height of the potential barrier decreases.
Question 24: A narrow slit is illuminated by a parallel beam of monochromatic light of wavelength λ equal to 6000 Å and the angular width of the central maximum in the resulting diffraction pattern is measured. When the slit is next illuminated by the light of wavelength λ’, the angular width decreases by 30%. Calculate the value of the wavelength λ’.
Solution: Angular width 2φ = 2λ/d , Given λ = 6000 Å , In Case of new λ (assumed λ’ here), angular width decreases by 30% New angular width = 0.70 (2 φ) 2 λ’/d = 0.70 X (2 λ/d) ∴λ’= 4200 Å.
Question 25: Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude 17.7 × 10-22 C/m2. What is electric field intensity E: (a) in the outer region of the first plate, and (b) between the plates?
Question 26:Two long straight parallel conductors carrying currents I1 and I2 are separated by a distance d. If the currents are flowing in the same direction, show how the magnetic field produced by one exerts an attractive force on the other. Obtain the expression for this force and hence define 1 ampere.
Solution: Diagram, Derivation, The ampere is the value of that steady current which, when maintained in each of the two very long, straight, parallel conductors of negligible cross-section, and placed one meter apart in vacuum, would exert on each of these conductors a force equal to 2 × 10–7newtons per meter of length.
Question 27: The magnetic field through a circular loop of wire, 12cm in radius and 8.5Ω resistance, changes with time as shown in the figure. The magnetic field is perpendicular to the plane of the loop. Calculate the current induced in the loop and plot a graph showing induced current as a function of time.
Question 29: Radiation of frequency 1015 Hz is incident on three photosensitive surfaces A, B, and C. The following observations are recorded: Surface A: no photoemission occurs Surface B: photoemission occurs but the photoelectrons have zero kinetic energy. Surface C: photo emission occurs and photoelectrons have some kinetic energy. Using Einstein’s photo-electric equation, explain the three observations
The graph shows the variation of photocurrent for a photosensitive metal (a)What do X and A on the horizontal axis represent? (b)Draw this graph for three different values of frequencies of incident radiation ʋ1, ʋ 2, and ʋ 3 (ʋ 3>ʋ 2>ʋ1) for the same intensity. (c) Draw this graph for three different values of intensities of incident radiation I1, I2, and I3 (I3> I2>I1) having the same frequency.
Solution: From the observations made (parts A and B) on the basis of Einstein’s photoelectric equation, we can draw the following conclusions: 1. For surface A, the threshold frequency is more than 1015 HZ, hence no photoemission is possible. 2. For surface B the threshold frequency is equal to the frequency of the given radiation. Thus, photo-emission takes place but the kinetic energy of photoelectrons is zero. 3. For surface C, the threshold frequency is less than 1015 Hz. So photoemission occurs and photoelectrons have some kinetic energy
(a) A - cut off or stopping potential
X - anode potential
Question 30: The ground state energy of the hydrogen atom is -13.6 eV. The photon emitted during the transition of an electron from n=3 to n=1 state, is incident on a photosensitive material of unknown work function. The photoelectrons are emitted from the material with the maximum kinetic energy of 9eV. Calculate the threshold wavelength of the material used.
Question 31:(a)Draw equipotential surfaces for (i)an electric dipole and (ii) two identical positive charges placed near each other. (b) In a parallel plate capacitor with air between the plates, each plate has an area of 6 x 10^-3m². and the separation between the plates is 3 mm. (i) Calculate the capacitance of the capacitor. (ii) If the capacitor is connected to a 100V supply, what would be the charge on each plate? (iii) How would the charge on the plate be affected if a 3 mm thick mica sheet of k=6 is inserted between the plates while the voltage supply remains connected?
(a)Three charges –q, Q, and –q are placed at equal distances on a straight line. If the potential energy of the system of these charges is zero, then what is the ratio Q:q? (b)(i) Obtain the expression for the electric field intensity due to a uniformly charged spherical shell of radius R at a point distant r from the center of the shell outside it. (ii) Draw a graph showing the variation of electric field intensity E with r, for r > R and r < R.
Question 32: (a) Explain the term drift velocity of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of drift velocity. (b) Two cells of EMFs E1 and E2 and internal resistances 𝑟ଵand 𝑟ଶ respectively are connected in parallel as shown in the figure. Deduce the expression for the (i) equivalent emf of the combination (ii) equivalent internal resistance of the combination (iii) potential difference between points A and B.
(a) State the two Kirchhoff’s rules used in the analysis of electric circuits and explain them. (b) Derive the equation of the balanced state in a Wheatstone bridge using Kirchhoff’s laws.
Question 33: (a) Draw the graph showing the intensity distribution of fringes with phase angle due to diffraction through a single slit. What is the width of the central maximum in comparison to that of a secondary maximum? b) A ray PQ is incident normally on the face AB of a triangular prism of refracting angle 600 as shown in the figure. The prism is made of a transparent material with a refractive index 2/√3. Trace the path of the ray as it passes through the prism. Calculate the angle of emergence and the angle of deviation.
a) Write two points of difference between an interference pattern and a diffraction pattern. b) (i) A ray of light incident on face AB of an equilateral glass prism, shows the minimum deviation of 30°. Calculate the speed of light through the prism. (ii) Find the angle of incidence at face AB so that the emergent ray grazes along the face AC.
Question 34: Case Study: Read the following paragraph and answer the questions. A number of optical devices and instruments have been designed and developed such as periscopes, binoculars, microscopes, and telescopes utilizing the reflecting and refracting properties of mirrors, lenses, and prisms. Most of them are in common use. Our knowledge about the formation of images by the mirrors and lenses is the basic requirement for understanding the working of these devices. (i) Why the image formed at infinity is often considered most suitable for viewing. Explain (ii) In modern microscopes multicomponent lenses are used for both the objective and the eyepiece. Why? (iii) Write two points of difference between a compound microscope and an astronomical telescope OR (iii) Write two distinct advantages of a reflecting type telescope over a refracting type telescope.
Solution: (I) When the image is formed at infinity, we can see it with minimum strain in the ciliary muscles of the eye.
(II) The multi-component lenses are used for both the objective and the eyepiece to improve image quality by minimizing various optical aberrations in lenses.
(III) (a)The compound microscope is used to observe minute nearby objects whereas the telescope is used to observe distant objects. (b) In a compound microscope, the focal length of the objective is lesser than that of the eyepiece whereas in a telescope the focal length of the objective is larger than that of the eyepiece.
(III) (a) The image formed by a reflecting type telescope is brighter than that formed by refracting telescope. (b) The image formed by the reflecting type telescope is more magnified than that formed by the refracting type telescope.
Question 35: Case study: Light emitting diode. Read the following paragraph and answer the questions LED is a heavily doped P-N junction that under forwarding bias emits spontaneous radiation. When it is forward-biased, due to the recombination of holes and electrons at the junction, energy is released in the form of photons. In the case of the Si and Ge diode, the energy released in recombination lies in the infrared region. LEDs that can emit red, yellow, orange, green, and blue light are commercially available. The semiconductor used for the fabrication of visible LEDs must at least have a band gap of 1.8 eV. The compound semiconductor Gallium Arsenide – Phosphide is used for making LEDs of different colours.
LEDs of different kinds (i). Why are LEDs made of compound semiconductors and not elemental semiconductors? (ii) What should be the order of the bandgap of an LED, if it is required to emit light in the visible range? (iii) A student connects the blue-colored LED as shown in the figure. The LED did not glow when switch S is closed. Explain why?
(iii) Draw V-I characteristic of a p-n junction diode in (i) forward bias and (ii) reverse bias
Solution: (I) LEDs are made up of compound semiconductors and not by the elemental conductor because the band gap in the elemental conductor has a value that can detect the light of a wavelength that lies in the infrared (IR) region.
(II) 1.8 eV to 3 eV
(III) LED is reversed biased which is why it is not glowing.
V-I Characteristic curves of PN junction diode in forward biasing and reverse biasing.
Steps to download CBSE Class 12 Physics Sample Paper 2023
Download the Sample Paper Class 12 Physics Exam 2023 with solutions for the exam by following the below-mentioned steps :
Step I- Visit the official website of CBSE Academic @ www.cbseacademic.nic.in or Click on the CBSE Class 12 Physics Sample Paper with Solutions for the Exam mentioned above.
Step II- Click on the notification appearing in the academic section- “Sample Question Papers of Classes XII Exams 2022-23”.
Step III- Click on the link under “Sample Papers Class XII”.
Step IV- The list of all subjects “Class XII Sample Question Paper & Marking Scheme for Exam 2022-23” appears on the screen.
Step V- Click on “SQP” for “Physics” and download CBSE Class 12 Physics Sample Paper 2022-23 pdf along with the Solution.
Step VI- Check the marking scheme after attempting each subject CBSE Class 12 Physics Sample Paper 2022-23.