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# ICSE Class X Sample / Model Paper 2021 : Physics

6 pages, 75 questions, 0 questions with responses, 0 total responses,    0    0
 Soumya Roy Sikkim Manipal University (SMU), Gangtok Master of Computer Application Computer Application
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MADHUSTHALI VIDYAPEETH F.M 80 Time 2h Date : PRE-BOARD II EXAMINATION: 2020-2021 SUBJECT: PHYSICS CLASS- X Answers 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 paper is the time allotted for writing the answers. Section I is compulsory. Attend any four questions from Section II. The intended marks of questions or parts of questions are given in brackets [ ]. SECTION - I (40 Marks) Attempt all question from this Section. Question 1 (a) (i) Define moment of force (ii) Write the relationship between the SI and CGS unit of moment of force. (b) Define a kilowatt hour. How is it related to joule? (c) A satellite revolves round a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason. (d) (i) Identify the class of the lever shown in the diagram: (ii) How is it possible to increase the M.A of the above lever without increasing its length"' (e) Give one example of each when: (i) Chemical energy chasers into electrical energy. (ii) Electrical energy changes into sound energy Question 2 (a) An electromagnetic radiation is used for photography in fog. [2] (i) Identify the radiation. (ii) Why is this radiation mentioned by you, ideal for this purpose? (b) (i) What is the relation between the refractive index of water with respect to air (a w) and the refractive index of air with respect to water (w a). (ii) If the refractive index of water with respect to air (a w) is 5/3. Calculate the refractive index of air with respect to water (w a). [2] (c) Specific heat capacity of a substance A is 3,800 Jkg-1K-1 and that of a substance B is 400 Jkg-1K-1. Which of the two substances is a good conductor of heat? Give a reason for your answer. [2] (d) A man playing a flute is able to produce notes of different frequencies. If he closes the holders near his mouth, will the pitch of the note produced, increase or decrease? Given a reason. [2] 1

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