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CBSE 12th Board Class 12 2020 : Physics

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Sifan Ali
Shri Ram Centennial School (SRCS), Dehradun

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Class XII Physics (042) Sample Question Paper 2018-19 Time allowed: 3 hours. Max. Marks: 70 General Instructions: 1. All questions are compulsory. There are 27 questions in all. 2. This question paper has four sections: Section A, Section B, Section C and Section D. 3. Section A contains five questions of one mark each, Section B contains seven questions of two marks each, Section C contains twelve questions of three marks each, and Section D contains three questions of five marks each. 4. There is no overall choice. However, internal choices have been provided in two questions of one mark, two questions of two marks, four questions of three marks and three questions of five marks weightage. You have to attempt only one of the choices in such questions. 5. You may use the following values of physical constants wherever necessary. c = 3 x 108 m/s h = 6.63 x 10-34 Js e = 1.6 x 10-19 C o = 4 x 10-7 T m A-1 0= 8.854 x 10-12 C2 N-1 m-2 = 9 x 109 N m2 C-2 me = 9.1 x 10-31 kg mass of neutron = 1.675 x 10-27 kg mass of proton = 1.673 x 10-27 kg Avogadro s number = 6.023 x 1023 per gram mole Boltzmann constant = 1.38 x 10-23 JK-1 . Section-A 1. 2. State the SI unit of the electric polarization vector P Define temperature coefficient of resistivity 1 1 1

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