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This book has been written for the aspirants of various competitive Exams like IAS, PCS, SSC, Railway (ASM/TC/CC etc.), CDS, NDA, SCRA, NTSE, CPO–SI, CSIR/NET (UGC) etc and similar other Exams. The book has been prepared on the basis of a comprehensive and rigorous observation of the trends of previous year papers of various competitive Exams in a very lucid, concise and update manner. This book consists of five segments (sections)—Physics, Astronomy, Computer, Chemistry and Biology. At the end of the contents of every segment some objective questions relevant to the corresponding topics and some previous year questions of the competitive Exams have been incorporated.