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PRE-BOARD ENAMINATION 2020-21 FIRST THE CLASS N(1csE) sCIENCE Paper- PHYSICS Maximunm marksi S Time: Two bours Tnstructions: Anwer ou be wrinten to this paper m r NOT will the e alloned t0 wwile on the ortswer durg the furst 13 qucstion popor reading ne tume gen ar he t a d scrpt proviided separatey dhe of tas paper time to e T h time mimtes, allowed for wriling spent in the n r e r s onder be answerod m the comect muxt a n d roll "All ilbsections of each quetion your n a o e on the question paper xcpr write anything brackets Please do not or purts of questions aregiven quesziona h e inicnded murks for Jram S e c i o n umbr in SectionI it complulsory Artempt amy four queation SECTIONI40marks this Attompt all questions from Question boidy a) Statc two conditions when The work done ty fic lder ( fuit to a ia be Secion equilibriumm n takesacath hu is orickot Degalve Lplan (e) Can the centre ot gravily ofa body be the velocity situated outade ts masct in materiaf? Cive an (21 example (d) Amac hine () act as a force multiplie ()speedmultiplier ln each case state whecther (e) The ecnergy of an clectron is ratio 40x 10 J. 1s more Express it than in or less than 2 1 2 eV Question 2 (a) A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20ms Calculate the maximum potental energy1gans as t gocs up (b) For which colourof white light, is the re fractive index ofa transparent medium (0 the least, () the most of a monochromatie ay through the (c) Draw a ray diagramto show refraction sulfcrs minimum prsm when F-13 if 121 deviatic0n This paper consists of four printed pages a 12 Turn ovct
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