(Download) CBSE Class-12 Sample Paper 2020-21: Physics
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(Download) CBSE Class-12 Sample Paper 2020-21 :Physics
Class: XII Session: 2020-2021
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
(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.
Section – A
All questions are compulsory. In case of internal choices, attempt any one of them.
Name the physical quantity having unit J/T.
Mention one use of part of electromagnetic spectrum to which a wavelength
of 21 cm (emitted by hydrogen in interstellar space) belongs.
Give the ratio of velocity of the two light waves of wavelengths 4000Å and 8000Å travelling in vacuum.
An electron with charge -e and mass m travels at a speed v in a plane
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?
A solenoid with N loops of wire tightly wrapped around an iron-core is
carrying an electric current I. If the current through this solenoid is reduced to half, then what change would you expect in inductance L of the solenoid.
An alternating current from a source is given by i=10sin314t. What is the effective value of current and frequency of source?
What is the value of angular momentum of electron in the second orbit of
Bohr’s model of hydrogen atom?
In a photoelectric experiment, the potential required to stop the ejection of
electrons from cathode is 4V. What is the value of maximum kinetic energy of emitted Photoelectrons?