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Ritwik Banerjee
Don Bosco School, Liluah, Howrah
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SCIENCE Paper I (Physics) (One hour and a half) Answer to this paper must be written on the paper provided separately. You will NOT be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answer. Attempt all the questions from Section A and four questions from Section B. The intended marks for questions or parts of questions, are given in brackets [ ] SECTION I (40 Marks) Attempt all questions from this section Question 1 a. Define gravitational unit of weight. [2] b. State two points of distinction between single fixed and single movable pulley [2] c. Can the light passing from air to water suffer total internal reflection? Why? [2] d. State two points of distinction between loudness and intensity of sound. [2] e. The power generating station electric power is generated at 11kV, however it is transmitted over long distance at 132kV. Explain. [2] Question 2 a. State the energy transformation in an A.C generator and D.C motor. [2] b. The following are examples of levers. State the class of levers to which each one belongs [2] i) Scissors , ii) Sugar tongs, iii) Nut cracker, iv) pliers. c. Give two applications of total internal reflection. [2] d. Why is calorimeter made of thin sheet of copper? [2] 1

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