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PRATIMA PALANDE SCHOOL (ICSE Board) st 1 Preliminary Examination Physics SCIENCE Paper 1 STD:X MAX. MARKS: 80 WRITING TIME: 2 hour READING TIME: 15 MINS INSTRUCTIONS: 1. Answers to this paper must be written on the paper provided by the School. 2. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the Question paper. 3. The time allotted for writing and uploading the answer scripts is mentioned on the top of the paper. 4. Please note that the time limit shown by the software is the time allotted for writing. 5. At the end of writing time, you will be provided an additional 20 minutes. This additional time is given for you to scan your answer sheets and upload them as a single PDF file. Please ensure that you utilise this time exclusively for the purpose mentioned. 6. The system will not allow you to upload your answer sheets beyond the allocated time. Attempt all questions from Section I and any four questions from Section II The intended marks for question or parts of the questions are given in the brackets [ ]. SECTION I Attempt all questions from this section Question 1 (a) (i) Does the position of centre of gravity of a body change when the body is deformed. Justify your answer. (ii) State a factor on which the position of center of gravity of a body depends. [2] (b) A satellite revolves around the earth in a circular path. What is the work done by the satellite? Justify your answer. [2] (c) Why is magnification positive for a concave lens, while it can be positive as well as negative for a convex lens? [2] (d) Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. When is the glass piece not seen and Why? (e) Name the pulley which has no gain in mechanical advantage. State the purpose of such a pulley. Question 2 (a) (i) A beam of monochromatic light undergoes minimum deviation in an equiangular prism, how does the beam pass through the prism, with respect to its base. (ii) If white light is used in the same way as in part (i) above, what change do you expect in the emergent beam. (b) State two factors which affect the loudness of a sound heard by a listener. [2] [2] (c) A metal wire of resistance 6 is stretched to twice its original length. Calculate the new resistance. [2] Page 1 of 5
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