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CBSE Class 12 Pre Board 2020 : Physics (Kendriya Vidyalaya (KV) Agra)

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KENDRIYA VIDYALAYA SANGATHAN AGRA REGION PRE- BOARD EXAMINATION 2019-20 CLASS - XII SUBJECT PHYSICS(THEORY) TIME 3:00 Hrs M.M.:70 SET H GENERAL INSTRUCTIONS (i) All questions are compulsory. there are 37 questions in all. (ii) this quetion paper has four section A, B, C and D. (iii) Section A contains 20 questions for one mark each,Section B contains 7 questions for two marks each, Section C contains 7 questions for thre marks each andSection D contains 3 questions for five marks each. there is no over all choice. However, internal choices have been provided in two (iv) questions of one marks, two questions of two marks, one question of three marks and each question of five marks. (v) Use of calculators is not permitted. (vi) You may use the following values of physical constants wherever necessary: c = 3x108 m/s, h = 6.626x10-34Js e = 1.602 x10-19 C m0 = 4 px10- 7TmA-1 1/4peo= 9 109 Nm2C 2 Mass of neutron mn=1.672x10-27 kg Mass of proton mp=1.672x10-27 kg Mass of electron me = 9 1 10-31 kg SECTION (A) 1 The unit J/C is the unit of a)electric field 2 (b) electric potential energy (c) electric potential (d) electric dipole moment Following graph shows the variation of photoelectric current with anode potential for two light beams of same wavelength but different intensity. Find the correct relation: 1 (a) I1>I2 (b) I1 =I2 (c) I1<I2 (d) I1 I2 Page 1 of 6

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