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o Bachani Nagar Malad (E) o Ashok Nagar Kandivli (E) o Thakur Complex Kandivli (E) PRELIMINARY EXAMINATION 2018-2019 Grade : X Date 11/12/2018 : Subject : Physics ICSE Marks: 80 Time : 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. This paper consists of 6 printed pages Attempt all questions from Section I and any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. 2 Hrs Section I (40 Marks) Attempt all questions from this section Question 1 a) (i) Define centre of gravity. (ii) Fill in the blank with appropriate word: The centre of gravity of a hollow cone of height h is at a distance______ from its base. [2] b) Give the energy conversion while (i) the lighting of a kerosene lamp (ii) Charging of a battery [2] c) A sound produced on the surface of a lake takes 4.5 s to reach a boatman. How much time will it take to reach a diver inside water at the same distance if speed of sound in water is 4.5 times the speed of sound in air? [2] d) Write any two factors affecting the refractive index of a medium. [2] e) In India, at what voltage and frequency is the electric power generated at the power generating station? [2] Question 2 a) How does the speed of light in glass changes on increasing the wavelength of light? Name the subjective property of light related to its wavelength. [2] b) A sound wave passes from one medium to another. Name one property of this wave (i) which changes (ii) which does not change. [2] c) How is MA related to VR for (i) an ideal machine (ii) a practical machine [2] d) Mention how specific resistance of the following changes with temperature: (i) Semiconductors (ii) constantan Physics/Grade X/ICSE/Preliminary Examination/ Page 1 of 6 [2] CAT/LD/2018-19
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