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Class 12 Notes 2016 : Physics

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Board Question Paper : March 2015 BOARD QUESTION PAPER : MARCH 2015 Note: i. All questions are compulsory. ii. Neat diagrams must be drawn wherever necessary. iii. Figures to the right indicate full marks. iv. Use of only logarithmic table is allowed. v. All symbols have their usual meaning unless otherwise stated. SECTION I Q.1. Select and write the most appropriate answer from the given alternatives for each subquestion: i. The period of a conical pendulum in terms of its length (l), semivertical angle ( ) and acceleration due to gravity (g) is: (A) 1 l cos 2 g (B) 1 l sin 2 g (C) 4 l cos 4g (D) 4 [7] l tan g ii. The kinetic energy of a rotating body depends upon (A) distribution of mass only. (B) angular speed only. (C) distribution of mass and angular speed. (D) angular acceleration only. iii. If the metal bob of a simple pendulum is replaced by a wooden bob of the same size, then its time period will (A) increase (B) remain same (C) decrease (D) first increase and then decrease iv. The graph between applied force and change in the length of wire within elastic limit is a (A) straight line with positive slope. (B) straight line with negative slope. (C) curve with positive slope. (D) curve with negative slope. v. When longitudinal wave is incident at the boundary of denser medium, then (A) compression reflects as a compression. (B) compression reflects as a rarefaction (C) rarefaction reflects as a compression. (D) longitudinal wave reflects as transverse wave. vi. The dimensions of universal gravitational constant are (B) [L2M1T0] (A) [L1M0T0] (D) [L3M 1T 2] (C) [L 1M1T 2] vii. Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15 C above the surroundings. The ratio of their rate of loss of heat is (A) 2:1 (B) 1 : 4 (C) 1:8 (D) 8 : 1 343

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