CBSE Physics Class 12 Sample Paper 1 for 2023-24, Essays (high school) of English

Download CBSE Physics Class 12 Sample Paper 1 for 2023-24 and more Essays (high school) English in PDF only on Docsity! Page 1 NODIA Sample Paper 1 CBSE Physics Class 12 Click the Following Button to See the Free MS/Solutions 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 /m s3 108#= v. h . Js6 63 10 34#= − ii. me . kg9 1 10 31#= − vi. 0ε . C N m8 854 10 12 2 1 2 #= − − − iii. e . C1 6 10 19#= − vii. Avogadro’s number .6 023 1023#= per iv. 0µ TmA4 10 7 1π #= − − 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 (d) half period zone 2. 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 (d) look shorter 3. Most of the substance show which of the following magnetic property? (a) diamagnetism (b) paramagnetism (c) ferromagnetism (d) both b and c Page 2 NODIA Sample Paper 1 CBSE Physics Class 12 Click the Following Button to See the Free MS/Solutions 4. 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) C C1 2+ (b) C C C V C V 1 2 1 1 2 2 + + (c) V V C V C V 1 2 1 1 2 2 + + (d) V V C V C V 1 2 2 2 1 1 2 2 2 2 + + 5. In photoelectric effect the maximum kinetic energy of emitted electron depends on (a) wavelength (b) frequency (c) intensity (d) work function 6. The number of Photons of frequency Hz1014 in radiation of . J6 62 will be (a) 1010 (b) 1015 (c) 1020 (d) 1025 7. What is the resistance of a W40 lamp which is lighted as full brilliance by a current of 3 1 A? (a) 120Ω (b) 240Ω (c) 360Ω (d) 480Ω
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(c) 360Ω 8. Which of the following does not obey the phenomenon of mutual induction? (a) dynamo (b) transformer (c) induction coil (d) electric heater 9. In a series combination, R 300Ω = , . HL 0 9= , FC 2 µ = , rad s1000 1ω = − − . The impedance of the LCR-circuit is (a) 400Ω (b) 500Ω (c) 900Ω (d) 1300Ω 10. An electric dipole consists of a positive and negative charge of C4 µ each placed at a distance of 5 mm. The dipole moment is (a) C m2 10 8# - - (b) C m4 10 8# - - (c) C m6 10 8# - - (d) C m8 10 8# - - 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 Page 5 NODIA Sample Paper 1 CBSE Physics Class 12 Click the Following Button to See the Free MS/Solutions 26. When does snell’s law fail in refraction? 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.
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Define multiplication factor of a fissionable mass. Give its physical significance. 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 λ . 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 d D 2 λ = (a) λ (b) /2λ (c) /3 2λ (d) 2λ (ii) Find the ratio of the maximum to minimum intensity observed on Sc , if z d Dλ = (a) 4 (b) 2 (c) 3 (d) 1
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Page 6 NODIA Sample Paper 1 CBSE Physics Class 12 Click the Following Button to See the Free MS/Solutions (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 S P S P1 2- is (a) n 2 1 λ +b l (b) nλ (c) A7 2 (d) A19 2
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(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) A5 2 (b) A13 2 (c) A7 2 (d) A19 2 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 qencl0ε φ = , when qencl is the net charge inside an imaginary closed surface called Gaussian surface. E dA:φ = v v# gives the electric flux through the Gaussian surface. The two equations hold only when the net charge is in vacuum or air. Page 7 NODIA Sample Paper 1 CBSE Physics Class 12 Click the Following Button to See the Free MS/Solutions (i) If there is only one type of charge in the universe, then (E"v Electric field, ds "v Area vector) (a) E ds 0: !v v# on any surface (b) E ds:v v# could not be defined (c) E ds: 3=v v# if charge is inside (d) E ds 0: =v v# if charge is outside, 0 E ds q : ε =v v# 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 µC 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 φ . If the surface area is doubled, then the flux is (a) 2φ (b) /2φ (c) /4φ (d) φ (v) A Gaussian surface encloses a dipole. The electric flux through this surface is (a) 0 q ε (b) q2 0ε (c) q 2 0ε (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.
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In a closed circuit of resistance 10Ω , the linked flux varies with time according to relation .t t6 5 12φ = − + At .t 0 25= second, What is the current (in Ampere) flowing through the circuit?