Trending ▼   ResFinder

# CBSE Class 12 Pre Board 2021 : Physics (Kendriya Vidyalaya (KV), Lucknow Region)

7 pages, 102 questions, 0 questions with responses, 0 total responses,    0    0
 CBSE 12 Pre Boards +Fave Message ProfileTimelineUploads
 Home > cbse12_pre_boards >   F Also featured on: School Page cbse12

Formatting page ...

KENDRIYA VIDYALAYA SANGATHAN, LUCKNOW REGION SECOND PRE BOARD EXAMINATION : 2020-21 SUBJECT: PHYSICS CLASS: XII QUESTION PAPER 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. 1 Questions Section-A A beam of alpha particle projected along + X axis, experiences a force due to a magnetic field along the + Y axis. What is the direction of the magnetic field? Marks 1 2 If , m and represent wavelength of X-Rays, microwaves & visible rays then arrange the waves in increasing order of wavelength. 1 OR Name the device used for the production of microwaves. 3 An alpha particle enters in a uniform magnetic field with constant velocity v at an acute angle with magnetic field. Draw its path. 1 4 A metallic piece gets hot when surrounded by a coil carrying high frequency alternating current. Why? 1 5 6 7 8 OR If alternating voltage produced by generator is given by V = 10 Sin 628 t and is applied across a 1000 ohm resistance, then what will be effective voltage? What is the value of angular momentum of electron in the third orbit of Bohr s model of hydrogen atom? The work function for a metal is 2 eV. When a photon of 5 eV falls on its surface, find the maximum KE of emitted electrons. Compare the nuclear densities of hydrogen and Helium nuclei. OR Which two particles are also produced during conversion of a proton into neutron? Name two important processes which occur during the formation of p-n 1 1 1 1 Page 1 of 7

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Tags : cbse pre boards, prelims 2015 - 2016, preliminary examinations, central board of secondary education, india schools, free question paper with answers, twelfth standard, xiith std, board exams, mock, model, sample, specimen, past, free guess papers.india, delhi, outside delhi, foreign, cbse class xii, cbse 12, 12th standard, cbse papers, cbse sample papers, cbse books, portal for cbse india, cbse question bank, cbse question papers with answers, pre board exam papers, cbse model test papers, solved board question papers of cbse last year, previous years solved question papers, free online cbse solved question paper, cbse syllabus, india cbse board sample questions papers, last 10 years cbse questions papers, cbse important questions, specimen / mock papers.