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ISC Class XII Notes 2024 : Physics

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CBSE Physics Class 12 Sample Paper 1 Page 1 Sample Paper 1 Class XII 2023-24 Physics Time: 3 Hours Max. Marks: 70 General Instructions: 1. There are 33 questions in all. All questions are compulsory. 2. This question paper has five sections: Section A, Section B, Section C, Section D and Section E. 3. All the sections are compulsory. 4. 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. 5. 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 6. Use of calculators is not allowed. 7. You may use the following values of physical constants where ever necessary i. c = 3 # 108 m/s v. h = 6.63 # 10 34 Js ii. me = 9.1 # 10 31 kg vi. 0 = 8.854 # 10 12 C2 N 1 m 2 iii. e = 1.6 # 10 19 C vii. Avogadro s number = 6.023 # 1023 per 7 1 iv. 0 = 4 # 10 TmA gram mole SECTION-A 1. In Huygen s wave theory, the locus of all points oscillating in the same phase is called a (a) ray (b) vibrator (c) wavefront 2. (d) half period zone If a glass rod is immersed in a liquid of the same refractive index, then it will (a) disappear (b) look bent (c) look longer 3. (d) look shorter Most of the substance show which of the following magnetic property? (a) diamagnetism (b) paramagnetism (c) ferromagnetism (d) both b and c Install NODIA App to See the Solutions. Click Here To Install Page 2 4. Sample Paper 1 CBSE Physics Class 12 When two charged capacitors having capacitance and potential C1 , V1 and C2 , V2 respectively, are joined with the help of a wire, the common potential will be (a) C1 + C2 (b) C1 V1 + C2 V2 C1 + C 2 2 2 (c) C1 V1 + C2 V2 (d) C1 V 12 + C22V 2 V1 + V2 V1 + V 2 5. In photoelectric effect the maximum kinetic energy of emitted electron depends on (a) wavelength (b) frequency (c) intensity 6. (d) work function The number of Photons of frequency 1014 Hz in radiation of 6.62 J will be (a) 1010 (b) 1015 (c) 1020 (d) 1025 7. What is the resistance of a 40 W lamp which is lighted as full brilliance by a current of 1 A? 3 (a) 120 (b) 240 (c) 360 (d) 480 Ans : (c) 360 8. Which of the following does not obey the phenomenon of mutual induction? (a) dynamo (b) transformer (c) induction coil 9. (d) electric heater In a series combination, R = 300 , L = 0.9 H , C = 2 F , = 1000 rad s 1 . The impedance of the LCR-circuit is (a) 400 (b) 500 (c) 900 (d) 1300 10. An electric dipole consists of a positive and negative charge of 4 C each placed at a distance of 5 mm. The dipole moment is (a) 2 # 10-8 C-m (b) 4 # 10-8 C-m (c) 6 # 10-8 C-m (d) 8 # 10-8 C-m 11. Two solenoids of the same length having number of turns in the ratio of 2 : 3 are connected in series. The ratio of magnetic fields at their centres is (a) 2 : 1 (b) 3 : 1 (c) 2 : 3 (d) 3 : 2 Install NODIA App to See the Solutions. Click Here To Install CBSE Physics Class 12 Sample Paper 1 Page 3 12. Assertion : In Young s experiment, the fringe width for dark fringes is different from that for white fringes. Reason : In Young s double slit experiment the fringes are performed with a source of white light, then only black and bright fringes are observed. (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. 13. Assertion : We cannot think of a magnetic field configuration with three poles. Reason : A bar magnet does exert a torque on itself due to its own field. (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. 14. Assertion (A) : Diamond behaves like an insulator. Reason (R) : There is a large energy gap between valence band and conduction band of diamond. (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. 15. Assertion : The setting sum appears to be red. Reason : Scattering of light is directly proportional to the wavelength. (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. Continue on next page..... Install NODIA App to See the Solutions. Click Here To Install Page 4 Sample Paper 1 CBSE Physics Class 12 16. Assertion (A) : Capacity of a parallel plate capacitor increases when distance between the plates is decreased. Reason (R) : Capacitance of capacitor is inversely proportional to distance between them. (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. In which situation is there a displacement current but no conduction current ? 18. Define conductivity of a material. Give its SI unit. 19. How does a circular loop carrying current behaves as a magnet? 20. The current flowing through a pure inductance 2 mH is I = (15 cos 300t) A . What is the (i) r.m.s. and (ii) average value of current for a complete cycle? 21. State the criteria for the phenomenon of total internal reflection of light to take place. O What is the difference between Magnification and Magnifying power? SECTION-C 22. In the Rutherford scattering experiment, the distance of closest approach for an -particle is d 0 . If -particle is replaced by a proton, then how much kinetic energy in comparison to -particle will be required to have the same distance of closest approach d 0 ? 23. Give two advantages of LED s over the conventional incandescent lamps. 24. Two equal balls having equal positive charge q coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two? 25. State the Bio-Savart law for the magnetic field due to a current carrying element. Use this law to obtain a formula for magnetic field at the centre of a circular loop of radius R carrying a steady current I . Indicate the direction of the magnetic field. Install NODIA App to See the Solutions. Click Here To Install CBSE Physics Class 12 Sample Paper 1 Page 5 26. Explain with reason, why 1. Sun appears reddish at sun-set or sun-rise 2. Sun is observed earlier to actual sun-rise. 27. How the size of a nucleus is experimentally determined? Write the relation between the radius and mass number of the nucleus. Show that the density of nucleus is independent of its mass number. 28. Explain why do we need coherent sources to produce interference of light. O How does one demonstrate, using a suitable diagram, that unpolarised light when passed through a polaroid gets polarised? SECTION-D 29. Consider the situation shown in figure. The two slits S1 and S2 placed symmetrically around the central line are illuminated by monochromatic light of wavelength . The separation between the slits is d. The light transmitted by the slits falls on a screen S0 place at a distance D from the slits. The slits S3 is at the central line and the slit S4 is at a distance from S3 . Another screen Sc , is placed a further distance D away from Sc . (i) Find the path difference if z = 2D d (a) (b) /2 (c) 3/2 (d) 2 (ii) Find the ratio of the maximum to minimum intensity observed on Sc , if z = dD (a) 4 (b) 2 (c) 3 (d) 1 Continue on next page..... Install NODIA App to See the Solutions. Click Here To Install Page 6 Sample Paper 1 CBSE Physics Class 12 (iii) Two coherent point sources S1 and S2 are separated by a small distance d as shown in figure. The fringes obtained on the screen will be (a) concentric circles (b) points (c) straight lines (d) semi-circles (iv) In the case of light waves from two coherent sources S1 and S2 , there will be constructive interference at an arbitrary point P, if the path difference S1 P - S2 P is (a) bn + 12 l (b) n (c) 7A2 (d) 19A2 O (v) Two monochromatic light waves of amplitudes 3A and 2A interfering at a point have a phase difference of 60 . The intensity at that point will be proportional to (a) 5A2 (b) 13A2 (c) 7A2 (d) 19A2 30. Gauss s law and Coulomb s law, although expressed in different forms, are equivalent ways of describing the relation between charge and electric field in static conditions. Gauss s law is 0 = q encl , when q encl is the net charge inside an imaginary closed surface called Gaussian surface. v gives the electric flux through the Gaussian surface. The two equations hold only = # Ev : dA when the net charge is in vacuum or air. Install NODIA App to See the Solutions. Click Here To Install CBSE Physics Class 12 Sample Paper 1 Page 7 (i) If there is only one type of charge in the universe, then ( Ev " Electric field, dsv " Area vector) (a) # Ev : dsv ! 0 on any surface (b) # Ev : dsv could not be defined (c) # Ev : dsv = 3 if charge is inside (d) # Ev : dsv = 0 if charge is outside, # Ev : dsv = q0 if charge is inside (ii) What is the nature of Gaussian surface involved in Gauss law of electrostatic ? (a) Magnetic (b) Scalar (c) Vector (d) Electrical (iii) A charge 10 C is placed at the centre of a hemisphere of radius R = 10 cm as shown. The electric flux through the hemisphere (in MKS units) is (a) 20 105 (b) 10 105 (c) 6 105 (d) 2 105 (iv) The electric flux through a closed surface area S enclosing charge Q is . If the surface area is doubled, then the flux is (a) 2 (b) /2 (c) /4 (d) (v) A Gaussian surface encloses a dipole. The electric flux through this surface is 2q (a) q (b) 0 0 (c) 2q 0 (d) zero SECTION-E 31. Define mutual inductance between a pair of coils. Derive an expression for the mutual inductance of two long coaxial solenoids of same length round one over the other. O In a closed circuit of resistance 10 , the linked flux varies with time according to relation = 6t2 5t + 1. At t = 0.25 second, What is the current (in Ampere) flowing through the circuit? Install NODIA App to See the Solutions. Click Here To Install Page 8 Sample Paper 1 CBSE Physics Class 12 32. Discuss the inconsistency in Ampere s circuital law. What modification was made my Maxwell in this law? O A parallel plate capacitor is charged to 60 C . Due to a radioactive source, the plate loses charge at the rate of 1.8 # 10-8 C-s-1 . What is the magnitude of displacement current? 33. Considering the case of a parallel plate capacitor being charged, show how one is required to generalise Ampere s circuital law to include the term due to displacement current. O The V - I characteristic of a silicon diode is as shown in the figure. Calculate the resistance of the diode at 1. I = 15 mA 2. V = 10 V . ****** Install NODIA App to See the Solutions. Click Here To Install

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