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http://www.icseguess.com/ Guess Paper 2013 Class XII Subject PHYSICS Paper- I(Theory) (Three hours) ------------------------------------------------------------------------------------------------------------------------------(Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) ---------------------------------------------------Answer all questions in Part I and six questions from Part II, choosing two questions from each of the Sections A, B and C. All working, including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. (Material to be supplied: Log tables including Trigonometric functions) A list of useful physical constants is given at the end of this paper. ------------------------------------------------------------------------------------------------------------------------------Part I (Compulsory) Question 1 A. Choose the correct alternative (a),(b), (c) or (d) for each of the questions given below: (i) [5] Two point charges 17.7 C and -17.7 C, separated by a very small distance, are kept inside a large hollow metallic sphere. Electric flux emanating through the sphere is: (a) 2 106 Vm (ii) (c) Zero (d) 4 106 Vm (c) ohm cm (d) ohm cm2 What are the units of specific resistance? (a) ohm m-2 (iii) (b) -2 106 Vm (b) ohm cm-1 (iii) If the current (I) flowing through a circular coil, its radius (R) and number of turns(N) in it are each doubled, magnetic flux density at its centre becomes: (a) Two times (iv) (b) Four times (c) Eight times (d) Sixteen times A bi convex lens of refractive index n1 is immersed in liquid of refractive index n2. The lens will behave like a concave only if (a) n1> n2 (v) (b) n1< n2 (c) n1 = n2 Ratio of the radius of third Bohr orbit to the radius of second Bohr orbit in hydrogen atom is: (a) 2:3 (b) 4:9 (c) 9:4 (d) 3:2 B. Answer all questions briefly and to the point: (i) (d) not possible [15] A dielectric slab of relative permittivity (i.e. dielectric constant) 6 is introduced between the two plates of an 8 F air capacitor, in order to completely occupy the space between the two plates. Find the new capacitance of the capacitor. (ii) Out of the following, which one cannot be the charge of a body? + 8.0 10-19C, -3.2 10-19C, 2.4 10-19C, or 6.4 10-19C www.icseguess.com Other Educational Portals www.cbseguess.com | www.ignouguess.com | www.aipmtguess.com | www.aieee.com | www.niosguess.com | www.iitguess.com
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