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Science of s.s

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  • 1. 7/12/12 Science of S.S.C Scribd Upload ssc modern physics Search Explore Documents Books - Fiction Books - Non-fiction 1 Health & Medicine Brochures/Catalogs of 81 Government Docs How-To Guides/Manuals Magazines/Newspapers Recipes/Menus School Work + all categories Featured Recent People Authors Students Researchers Publishers Government & Nonprofits Businesses Musicians Artists & Designers Teachers + all categories Most Followed Popular Search This Document Sign Up Search | Search History: Log In Searching... Result 00 of 00 00 results for result for p. “Achieve success through”www.scribd.com/doc/9292617/Science-of-SSC 1/60
  • 2. 7/12/12 Science of S.S.C SCIENCE OMTEX - CLASSES “THE HO ME OF TEXT” SCIENCE NA M E Std . Di v. Co l / Sc hoo l - - - -- - - -- - - -- - - -- - - -- - - FOR PRIVATE CIRCULATION ONLY 1 “ROME WAS NOT BUILD IN A DAY” INDEXwww.scribd.com/doc/9292617/Science-of-SSC 2/60
  • 3. 7/12/12 Science of S.S.C 2 “ROME WAS NOT BUILD IN A DAY” FUELS Q1. Define 1. Radioactivity:- The phenomenon of spontaneous and continuous emission of radiation from certain heavy element is called radioactivity. 2. Radioactive substance:- The substance, which spontaneously and continuously emits certain radiations is called a radioactive substance. 3. Fission products:- The products formed during a nuclear fission are called fission products. 4. Controlled chain reaction:- The process in which most of the neutrons liberated in the chain reaction are absorbed and only a few neutrons are allowed to carry on the reaction is called controlled chain reaction. 5. Un – controlled chain reaction:- The self accelerating chain reaction which takes place on its own around is called uncontrolled chain reaction. 6. Calorific value:- The quantity of heat produced by the complete combustion of unit mass of a fuel is called the calorific value of the fuel. 7. Disintegration of radioactive elements:- The process of continuous and spontaneous emission of radiation’s from a radioactive element to form a new element continues till a non – radioactive element is formed is called disintegration or decay of radioactive elements. 8. Nuclear wastes:- The harmful radioactive waste are produced by mining into enrichment and use in the nuclear reactors is known as nuclear wastes. Q2. Give scientific reasons:- 1. Boron steel or cadmium rods are used to control chain reaction Ans. 1. Boron steel or cadmium rods have a property of absorbing neutrons. 2. The rate of chain reaction can be reduced by absorbing some of neutrons which is generated, therefore boron steel or cadmium rods are used to control chain reaction. 2. The elements having atomic number greater than 82 are radioactive Ans. The nuclei of elements having atomic number greater than 82 are unstable. Hence, the elements having atomic number greater than 82 are radioactive. 3. Water gas is called blue gas. Ans. Water gas burns with bluish flame. Hence water gas is called blue gas. 4. Coal is fossil fuel. Ans. Coal is formed form the remains of plants and animals buried under the ground million of years back. Such remains are called fossils. Hence, coal is fossil fuel. 3 “ROME WAS NOT BUILD IN A DAY”www.scribd.com/doc/9292617/Science-of-SSC 3/60
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  • 57. 7/12/12 Science of S.S.C Leave a Comment You must be logged in to leave a comment. Submit Characters: 400 amancool thanks for the creators reply02 / 15 / 2009 You must be logged in to leave a comment. Submit Characters: ...www.scribd.com/doc/9292617/Science-of-SSC 57/60
  • 58. 7/12/12 Science of S.S.C Science of S.S.C Download or Print 2,206 Reads Info and Rating Category: Uncategorized. Rating: Upload Date: 12/22/2008 Copyright: Attribution Non-commercial Tags: Education Flag document for inapproriate content Uploaded by aaminomtex Follow Download Embed Doc Copy Link Add To Collection Comments Readcast Share × Tw eet 0 0 Like Share on Scribd: Readcast Search This Document Search TIP Press Ctrl-F⌘F to quickly search anywhere in the document. More from This User Related Documents More From This User 68 p. Science and Technology 2012 - 2013 sscwww.scribd.com/doc/9292617/Science-of-SSC 58/60
  • 59. 7/12/12 Science of S.S.C 1 p. SCIENCE AND TECHNOLOGY COVER PAGE OMTEX CLASSES 98 p. Accounts Notes for the year 2012 - 2013 Next Upload ssc modern physics Search Follow Us! scribd.com/scribd twitter.com/scribd facebook.com/scribd About Press Blog Partners Scribd 101 Web Stuff Support FAQ Developers / API Jobs Terms Copyright AdChoiceswww.scribd.com/doc/9292617/Science-of-SSC 59/60
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