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Class : 12th
Sub : Physics
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CBSE EXAM 2025 20 Sets
NODIA APP Sample Paper 01 Page 1
Sample Paper 01
Class XII 2024-
Physics Time: 3 Hours Max. Marks: 70 General Instructions:
- There are 33 questions in all. All questions are compulsory.
- This question paper has five sections: Section A, Section B, Section C, Section D and Section E.
- All the sections are compulsory.
- Section A contains sixteen questions, twelve MCQ and four assertion reasoning based of 1 mark each, Section B contains five questions of 2 marks each, Section C contains seven questions of 3 marks each, Section D contains two case study based questions of 4 marks each and Section E contains three long questions of 5 marks each.
- There is no overall choice. However, an internal choice has been provided in one question in Section B, one question in Section C, one question in each CBQ in Section D and all three questions in Section E. You have to attempt only one of the choices in such questions
- Use of calculators is not allowed.
- You may use the following values of physical constants where ever necessary i. c = (^3) # 10 8 m s/ ii. me = 9 1. (^) # 10 −^31 kg iii. e = 1 6. (^) # 10 −^19 C iv. μ (^) 0 = 4 π (^) # 10 −^7 Tm A −^1 v. h = 6 63. (^) # 10 −^34 Js vi. ε (^) 0 = 8 854. (^) # 10 −^12 C N^2 −^1 m −^2 vii. Avogadro’s number = 6 023. (^) # 10 23 per gram mole
SECTION-A
1. When a body is connected to the earth, then electrons from the earth, flow into the body. It means that the body is (a) unchanged (b) an insulator (c) positively charged (d) negatively charged 2. A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of either part is (a) M (b) M / 2 (c) 2 M (d) Zero 3. The radius of curvature of plane mirror is (a) infinite (b) zero (c) + 5 cm (d) - 5 cm 4. The interference occurs in which of the following waves? (a) transverse (b) longitudinal (c) electromagnetic (d) all of these 5. Rutherfrd’s α -particle experiment showed that the atoms have (a) proton (b) nucleus (c) neutron (d) electrons
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NODIA APP Sample Paper 01 Page 3
16. Assertion : X-ray travel with the speed of light. Reason : X-rays are electromagnetic rays. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct.
SECTION-B
17. How does oscillating charge produce electromagnetic waves? 18. A hollow metal sphere of radius 5 cm is charged such that potential on its surface is 10 V. What is the potential at the centre of the sphere? 19. Two identical cells, each of emf E , having negligible internal resistance, are connected in parallel with each other access an external resistance R. What is the current through this resistance? 20. Define stopping potential.
R
Write the expression for the de-Broglie wavelength associated with a charged particle having charge q and mass m , when it is accelerated by a potential.
21. State two characteristic properties distinguishing behaviour of paramagnetic and diamagnetic materials.
SECTION-C
22. Draw path of rays for astronomical telescope in normal adjustment. 23. What is the nature of electrostatic force between two point electric charges q 1 and q 2 if (i) q (^) 1 + q (^) 2 > 0? (ii) q (^) 1 + q (^) 2 < 0? 24. A circular coil of closely wound N turns and radius r carries a current I. Write the expressions for the following: (i) The magnetic field at its centre. (ii) The magnetic moment of this coil. 25. A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the directions of induced current in each coil.
Page 4 Sample Paper 01 CBSE Physics Class 12
26. In a typical nuclear reaction, e.g.,
H H He n. 1
although number of nucleons is conserved, yet energy is released. How? Explain.
27. Conduction and displacement currents are individually discontinuous, but their sum is continuous.
R Name the parts of the electromagnetic spectrum which is (i) suitable for RADAR systems in aircraft navigations. (ii) used to treat muscular strain. (iii) used as a diagnostic tool in medicine. Write in brief, how these waves can be produced.
28. What is difference between diffraction and interference?
SECTION-D
Case Study Based Questions.
Read the following paragraph and answer the questions that follow.
29. A photodiode is an optoelectronic device in which current carriers are generated by photons through photo-excitation i.e., photo conduction by light. It is a p - n junction fabricated from a photosensitive semiconductor and provided with a transparent window so as allow light to fall on its function. A photodiode can turn its current ON and OFF in nanoseconds. So, it can be used as a fastest photo- detector.
(i) A p - n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength (a) 4000 nm (b) 6000 nm (c) 4000 Ac^ (d) 6000 Ac
Page 6 Sample Paper 01 CBSE Physics Class 12
(c) focal lengths of both objects and eye-piece are increased (d) focal lengths of both objects and eye-piece are decreased.
SECTION-E
31. What is alternating current? How alternating e.m.f. and current is represented mathematically. What do you mean by time period, frequency and amplitude of alternating current? R Show diagrammatically two different arrangements used for winding the primary and secondary coils in a transformer. Assuming the transformer to be an ideal one, write the expression for the ration of its: (i) Output voltage to input voltage. (ii) Output current to input current. Mention two reasons for energy losses in an actual transformer. 32. Define the term binding energy. The binding energy of a nucleus (^) ZA^ X is given by the formula:
B.E. = [ Zm H + ( A − Z ) m n − m ( ZA^ X )] c^2
where m ( Z A^ X )is the atomic mass of X. Derive this equation, state clearly the approximation involved and say it is very safe approximation. R Give reason for : (i) Lighter elements are better maderators for a nuclear reactor than heavier elements. (ii) In a natural uranium reactor, heavy water is preferred moderator as compared to ordinary water. (iii) Cadmium rods are provided in a reactor. (iv) Very high temperature as those obtained in the interior of the sun are required for fusion reaction.
33. What do you understand by the resistivity of a conductor? Discuss its temperature dependence for a (i) Metallic conductor (ii) Semiconductor (iii) Ionic conductor (iv) Electrolyte. R Determine the potentials at the points X 1 and X 2 in the circuit.
NODIA APP Sample Paper 02 Page 1
Sample Paper 02
Class XII 2024-
Physics Time: 3 Hours Max. Marks: 70 General Instructions:
- There are 33 questions in all. All questions are compulsory.
- This question paper has five sections: Section A, Section B, Section C, Section D and Section E.
- All the sections are compulsory.
- Section A contains sixteen questions, twelve MCQ and four assertion reasoning based of 1 mark each, Section B contains five questions of 2 marks each, Section C contains seven questions of 3 marks each, Section D contains two case study based questions of 4 marks each and Section E contains three long questions of 5 marks each.
- There is no overall choice. However, an internal choice has been provided in one question in Section B, one question in Section C, one question in each CBQ in Section D and all three questions in Section E. You have to attempt only one of the choices in such questions
- Use of calculators is not allowed.
- You may use the following values of physical constants where ever necessary i. c = (^3) # 10 8 m s/ ii. me = 9 1. (^) # 10 −^31 kg iii. e = 1 6. (^) # 10 −^19 C iv. μ (^) 0 = 4 π (^) # 10 −^7 Tm A −^1 v. h = 6 63. (^) # 10 −^34 Js vi. ε (^) 0 = 8 854. (^) # 10 −^12 C N^2 −^1 m −^2 vii. Avogadro’s number = 6 023. (^) # 10 23 per gram mole
SECTION-A
1. The drift velocity Vd and applied electric field E of a conductor are related as (a) Vd? E (b) Vd? E (c) Vd? E^2 (d) Vd =constan t 2. In a circuit, the current lags behind the voltage by a phase difference of π /2 radians. The circuit contains which of the following? (a) only R (b) only L (c) only C (d) R and C 3. According to classical theory, the path of an electron in Rutherford’s atom is (a) spiral (b) circular (c) parabolic (d) straight line 4. If a ray of light is incident on a plane mirror at an angle of 30 c, then deviation produced by the plane mirror is (a) 30 c (b) 60 c (c) 90 c (d) 120 c 5. If the intensity of light falling on a metal is increased, then (a) K.E. of photoelectrons increases (b) photoelectric current increases (c) K.E. of photoelectrons decreases (d) photoelectric current remains constant
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NODIA APP Sample Paper 02 Page 3
(c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct.
16. Assertion : In Young’s double slit experiment the two slits are at distance d apart. Interference pattern is observed on a screen at distance D from the slits. At a point on the screen when it is directly opposite to one of the slits, a dark fringe is observed. Then, the wavelength of wave is proportional to square of distance of two slits. Reason : For a dark fringe intensity is zero. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct.
SECTION-B
17. What is the angle of dip at a place where the horizontal and vertical components of the earth’s magnetic field are equal? 18. Graph showing the variation of current versus voltage to a material GaAs is shown in the figure. Identify the region of
(i) negative resistance. (ii) where Ohm’s law is obeyed?
19. State the important properties of displacement current. 20. Write the basic features of photon picture of electromagnetic radiation on which Einstein’s photoelectric equation is based. R Show the variation of photocurrent with collector plate potential for different intensity but same frequency of incident radiation.
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Page 4 Sample Paper 02 CBSE Physics Class 12
21. Why there is no work done in moving a charge from one point to another on an equipotential surface?
SECTION-C
22. Draw energy band diagram of n -typed and p -typed semiconductor at temperature T 2 0 K. Mark the donar and acceptor energy level with their energies. 23. Describe two commonly used devices which use polarised light. 24. Define uniform and non-uniform electric fields. How are they represented geometrically? 25. Explain, giving reasons, the basic difference in converting a galvanometer into (1) a voltmeter and (2) an ammeter. 26. When is the magnetic flux taken as positive and negative? 27. Answer the following questions : (i) Name the electromagnetic waves which are suitable for RADAR systems used in aircraft navigation. Write the range of frequency of these waves. (ii) If the earth dis not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain. (iii) An electromagnetic wave exerts pressure on the surface on which it is incident. Justify. R (i) Describe briefly how electromagnetic waves are produced by oscillating charges. (ii) Give one use of each of the following : (a) Microwaves (b) Ultraviolet rays (c) Infrared rays (d) Gamma rays 28. In an experiment of α -particle scattering by a thin foil of gold, draw a plot showing the number of particle scattered versus the scattering angle θ. Why is it that a very small fraction of the particles are scattered at θ > 90 c?
Page 6 Sample Paper 02 CBSE Physics Class 12
(a) 1.5 (b) 1. (c) 2.0 (d) 2. (iii) An under-water swimmer cannot see very clearly even in absolutely clear water because of (a) absorption of light in water (b) scattering of light in water (c) reduction of speed of light in water (d) change in the focal length of eye-lens (iv) A thin lens of glass ( μ = 1 5.) of focal length 10 cm is immersed in water (^) ^ μ =1 33. h. The new focal length is (a) 20 cm (b) 40 cm (c) 48 cm (d) 12 cm
R An object is immersed in a fluid. In order that the object becomes invisible, it should (a) behave as a perfect reflector (b) absorb all light falling on it (c) have refractive index one (d) have refractive index exactly matching with that of the surrounding fluid.
SECTION-E
31. Express one atomic mass unit in energy units, first in Joules and them in MeV. Using this, express the mass defect of 816 Oin MeV. R Explain giving necessary reaction, how energy is released during : (i) fission (ii) fusion 32. Define terminal potential difference of a cell. When a battery of emf e and internal resistance r is connected to a resistance R , a current I flows through it. Derive the relation between e , I , r and R. R Two cells of emfs 1.5 V and 2.0 V having internal resistance 0 2. Ω and 0 3. Ω respectively are connected in parallel. Calculate the emf and internal resistance of the equivalent cell. 33. (i) An AC source of voltage V = V 0 (^) sin ωt is connected to a series combination of L , C and R. Use the phasor diagram to obtain expression for impedance of the circuit and phase angle between voltage and current. Find the condition when current will be in phase with the voltage. What is the circuit in this condition called? (ii) In a series LR circuit X (^) L = R ans power factor of the circuit is P 1. When capacitor with capacitance C such that X (^) L = XC is put in series, the power factor becomes P 2. Calculate (^) PP 2
R
Draw a labelled diagram of a step-down transformer. State the principle of its working. Express the turn ratio in terms of voltages. Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer. How much current is drawn by the primary of a transformer connected to 220 V supply when it delivers power to a 100 V -^500 Wrefrigerator?
NODIA APP Sample Paper 03 Page 1
Sample Paper 03
Class XII 2024-
Physics Time: 3 Hours Max. Marks: 70 General Instructions:
- There are 33 questions in all. All questions are compulsory.
- This question paper has five sections: Section A, Section B, Section C, Section D and Section E.
- All the sections are compulsory.
- Section A contains sixteen questions, twelve MCQ and four assertion reasoning based of 1 mark each, Section B contains five questions of 2 marks each, Section C contains seven questions of 3 marks each, Section D contains two case study based questions of 4 marks each and Section E contains three long questions of 5 marks each.
- There is no overall choice. However, an internal choice has been provided in one question in Section B, one question in Section C, one question in each CBQ in Section D and all three questions in Section E. You have to attempt only one of the choices in such questions
- Use of calculators is not allowed.
- You may use the following values of physical constants where ever necessary i. c = (^3) # 10 8 m s/ ii. me = 9 1. (^) # 10 −^31 kg iii. e = 1 6. (^) # 10 −^19 C iv. μ (^) 0 = 4 π (^) # 10 −^7 Tm A −^1 v. h = 6 63. (^) # 10 −^34 Js vi. ε (^) 0 = 8 854. (^) # 10 −^12 C N^2 −^1 m −^2 vii. Avogadro’s number = 6 023. (^) # 10 23 per gram mole
SECTION-A
1. The energy of a photon of wavelength λ is (a) hcλ (b) hc / λ (c) h λ / c (d) λ / hc 2. The waves which can not travel in vacuum are (a) X-rays (b) radio-waves (c) infrasonic waves (d) ultra-violet waves 3. A charged particle is released from rest in a region of steady and uniform electric and magnetic fields, which are parallel to each other. The particle will move in a (a) circle (b) helix (c) cycloid (d) straight line 4. If light waves emitted by two coherent sources have wavelengths λ 1 and λ 2 , then (a) l (^) 1 = l 2 (b) l 1 (^) > l 2 (c) l (^) 1 < l (^) 2 (d) l l 1 2 = 1 5. If voltage across a lamp increases by 2%, then increase in its power will be (a) 1% (b) 2% (c) 3% (d) 4% Cont onue Co oueen paueeeeeee
NODIA APP Sample Paper 03 Page 3
15. Assertion : At the first glance, the top surface of the Morpho butterfly’s wing appears a beautiful blue- green. If the wind moves the colour changes. Reason : Different pigments in the wing reflect light at different angles. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct. 16. Assertion : A disc-shaped magnet is deviated above a superconducting material that has been cooled by liquid nitrogen. Reason : Superconducting repel a magnet. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct.
SECTION-B
17. Why does the Sun look reddish at sunset or sunrise?
R
When observed from under water, all the objects above the surface can be seen within a cone of 97 c Why ? Explain.
18. Figure shows the field lines due to a negative point charge. Give the sign of the potential energy difference
of a small negative charge between the points A and B.
19. Define mean value and root mean square value of alternating current. 20. Does the emf represent a force of potential energy or work done per unit charge or potential difference? Does emf have electrostatic origin? 21. Why does paramagnetic substance move from weaker to stronger parts of non-uniform magnetic field?
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Page 4 Sample Paper 03 CBSE Physics Class 12
SECTION-C
22. Give the physical significance of electric field. 23. Applying Biot-Savart’s law deduce the expression for the magnetic field at the centre of a semicircular loop of radius R carrying current I. 24. Draw path of rays for astronomical telescope in normal adjustment. 25. In a typical nuclear reaction, e.g.,
12 H^ +^12 H^ $ 23 He^ +^0 n^1 +^ 3 27^. MeV although number of nucleons is conserved, yet energy is released. How? Explain.
26. Why is the classical Rutherford model for an atom of electron orbiting around the nucleus not able to explain the atomic structure? 27. State Malus law. Draw a graph showing the dependence of intensity of transmitted light on the angle between polariser and analyser. R What will be the effect on interference fringes obtained in Young’s double slit experiment if (1) one slit is covered, (2) a source of light of higher wavelength is used, (3) distance between two slits be increased to 1 cm and (4) distance between screen and double slit is increased? 28. Draw energy band diagram of n -typed and p -typed semiconductor at temperature T 2 0 K. Mark the donar and acceptor energy level with their energies.
SECTION-D
29. Net electric flux through a cube is the sum of fluxes through its six faces. Consider a cube as shown in figure, having sides of length L = 10.0 cm. The electric field is uniform, has a magnitude E = 4.00 × 10^3 NC–1^ and is parallel to the xy plane at an angle of 37° measured from the + x -axis towards the + y -axis.
Page 6 Sample Paper 03 CBSE Physics Class 12
(iv) The maximum number of possible interference maxima for slit separation equal to twice the wavelength in Young’s double-slit experiment, is (a) infinite (b) five (c) three (d) zero
R
The resultant amplitude of a vibrating particle by the superposition of the two waves y 1 (^) = a sina ω t + π 3 k and y (^) 2 = a sin ωt is (a) a (b) 2 a (c) 2 a (d) 3 a
SECTION-E
31. What are eddy currents? How are they produced? Give some experiments to demonstrate their existence.
R The magnetic flux linked with a coil is given by the equation: φ = 3 t^2 + 4 t + 9 Wb. What is the magnitude of E.M.F. induced at t = 2 s?
32. With the help of a circuit diagram, explain the working of a junction diode as a full wave rectifier. Draw its input and output waveforms. Which characteristic property makes the junction diode suitable for rectification? R A battery of emf 12 V and internal resistance 2 Ω is connected to a 4 Ω resistor as shown in the figure.
(i) Show that a voltmeter when placed across the cell and across the resistor in turn, gives the same reading. (ii) To record the voltage and the current in the circuit why is voltmeter placed in parallel and ammeter in series in the circuit?
33. Prove mathematically that electromagnetic waves are transverse in nature.
R When an AC source is connected across a capacitor, current starts flowing through the circuit. Show how Ampere’s circuital law is generalized to explain the flow of current through the capacitor. Hence obtain the expression for the displacement current inside the capacitor.
NODIA APP Sample Paper 04 Page 1
Sample Paper 04
Class XII 2024-
Physics Time: 3 Hours Max. Marks: 70 General Instructions:
- There are 33 questions in all. All questions are compulsory.
- This question paper has five sections: Section A, Section B, Section C, Section D and Section E.
- All the sections are compulsory.
- Section A contains sixteen questions, twelve MCQ and four assertion reasoning based of 1 mark each, Section B contains five questions of 2 marks each, Section C contains seven questions of 3 marks each, Section D contains two case study based questions of 4 marks each and Section E contains three long questions of 5 marks each.
- There is no overall choice. However, an internal choice has been provided in one question in Section B, one question in Section C, one question in each CBQ in Section D and all three questions in Section E. You have to attempt only one of the choices in such questions
- Use of calculators is not allowed.
- You may use the following values of physical constants where ever necessary i. c = (^3) # 10 8 m s/ ii. me = 9 1. (^) # 10 −^31 kg iii. e = 1 6. (^) # 10 −^19 C iv. μ (^) 0 = 4 π (^) # 10 −^7 Tm A −^1 v. h = 6 63. (^) # 10 −^34 Js vi. ε (^) 0 = 8 854. (^) # 10 −^12 C N^2 −^1 m −^2 vii. Avogadro’s number = 6 023. (^) # 10 23 per gram mole
SECTION-A
1. A single slit of width (^) 0 5. mmis illuminated by parallel light of wavelength (^5000) Ac^ and diffraction pattern is observed on a screen 1 m from the slit. The width of the central maxima is (a) 500 mm (b) 600 mm (c) 700 mm (d) 800 mm 2. A diamagnetic material in a magnetic field moves (a) from weaker to stronger parts (b) perpendicular to the field (c) from stronger to weaker parts (d) in none of the above directions 3. A parallel plate air capacitor is charged to a potential difference of (^) V. If distance between the plates is increased, then potential difference between the plates. (a) decreases (b) increases (c) becomes zero (d) does not change 4. In photoelectric effect, the number of electrons ejected per second is proportional to (a) intensity of light (b) wavelength of light (c) frequency of light (d) frequency of the metal 5. A battery of 12 V and internal resistance (^) 0 5. Ω is connected across a variable resistance (^) R. The value of R , for which the power delivered is maximum is equal to (a) (^) 0 25. Ω (b) (^) 0 5. Ω (c) (^) 1 2. Ω (d) (^) 2 4. Ω Cont onue Co oueen paueeeeeee
