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# CBSE Class 12 Sample / Model Paper 2021 : Physics (with Marking Scheme / Solutions)

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Class: XII Session: 2020-2021 Subject: Physics Sample Question Paper (Theory) Maximum Marks: 70 Marks Time Allowed: 3 hours General Instructions: (1) All questions are compulsory. There are 33 questions in all. (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. (3) Section A contains ten very short answer questions and four assertion reasoning MCQs of 1 mark each, Section B has two case based questions of 4 marks each, Section C contains nine short answer questions of 2 marks each, Section D contains five short answer questions of 3 marks each and Section E contains three long answer questions of 5 marks each. (4) There is no overall choice. However internal choice is provided. You have to attempt only one of the choices in such questions. Sr. No. Marks Section A All questions are compulsory. In case of internal choices, attempt any one of them. 1 Name the physical quantity having unit J/T. 1 2 Mention one use of part of electromagnetic spectrum to which a wavelength 1 of 21 cm (emitted by hydrogen in interstellar space) belongs. OR Give the ratio of velocity of the two light waves of wavelengths 4000 and 8000 travelling in vacuum. 3 An electron with charge -e and mass m travels at a speed v in a plane 1 perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time, t, the electron travels halfway around the circle. What is the amount of work done by the magnetic field? Page 1 of 10

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