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IIT JAM 2012

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Brijmohan
Banaras Hindu University (BHU), Varanasi
PhD Condensed matter Physics

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fiziks Forum for CSIR-UGC JRF/NET, GATE, IIT-JAM, GRE in PHYSICAL SCIENCES IIT-JAM-2012(PHYSICS) IMPORTAN NOTE FOR CANDIDTES Attempt ALL 25 questions. Questions 1-15(objective questions) carry six marks each and questions 1625(subjective questions) carry twenty one marks each. Q1. Given a function of both position x and time t, the value of f dx df x, t , x (where f ) is x dt dt (a) Q2. 2 f x 2 f x (c) f x (d) df dx If F is a constant vector and r is the position vector then F r would be (a) r F (b) F (c) F r (d) r F Q3. (b) Three masses m, 2m and 3m are moving in x-y plane with speeds 3u, 2u and u, respectively, as shown in the figure. The three masses collide at the same time at P and stick together. The velocity of the resulting mass would be y 2m 2u 60 m 3u P x 60 u 3m (a) u 3y x 12 (b) u 3y x 12 (c) u 3y x 12 (d) u 3y x 12 fiziks c/o Anand Institute of mathematics, 28-B/6 Jia Sarai Near IIT, Hauz Khas, New Delhi, PIN- 110016 (INDIA) Phone: 011-32718565, +91-9871145498 Website: http://www.physicsbyfiziks.com Email: fiziks.physics@gmail.com 1

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