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Physics SCIENCE Paper-I (Two Hours) 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 answers. Attempt all questions from Section I and attempt any four from Section II. The intended marks for questions or parts of questions are given in brackets []. SECTION I [Marks 40] Attempt all questions from this Section. Question 1 (a) i) State the unit of moment of force. ii) Is clock wise moment of force positive or negative? (b) Name the chief energy transformations that occur in the following: i) a toaster ii) charging of a cell phone. [2] [2] (c) An electron revolves around the nucleus in a circular path:i) Which force acts on the electron to maintain its circular motion? ii) Define the force stated by you in the above question. [2] (d) i) Name the type of waves used for sound ranging. ii) Why are these sound waves mentioned in (i) above not audible to us? [2] (e) A refrigerator is marked 80 W and 220 V. How much energy does it consume in one day? [2] Question 2 (a) i) Which lens, thick or thin has greater focal length? ii) Name the lens that always forms a virtual and erect image. [2] (b) Give two reasons why the efficiency of a single movable pulley system is not 100%. [2] (c) You are provided with a printed piece of paper. Using this paper, how will you differentiate between a convex lens and a concave lens? [2] (d) In a music concert, the singer is accompanied by a guitarist and a drummer i) How does the tension in the strings of guitar affect the pitch of the musical notes played? ii) What happens to the sound when the drummer increases the force with which he strikes the drum? [2] (e) State two advantages of using a right angled prism as a reflector rather than a plane mirror? [2] [TPS-Std. 10 Physics- Preliminary Examination 13/01/2021] This paper consists of 5 printed pages. 1/5 Turn Over
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