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ICSE Class X Prelims 2020 : Physics

5 pages, 15 questions, 1 questions with responses, 1 total responses,

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ICSE Board Class IX Physics Paper 2 Time: 2 hrs Total Marks: 80 General Instructions: 1. Answers to this paper must be written on the paper provided separately. 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 given at the head of the paper is the time allotted for writing the answers. 4. Attempt all questions from Section I and any four questions from Section II. 5. The intended marks of questions or parts of questions are given in brackets [ ]. SECTION I (40 Marks) Attempt all Questions from this Section Question 1 (a) Enrico Fermi (Italian physicist) suggested that the length of one lecture period (50 min) is nearly equal to one micro-century. Verify it by converting micro-century into minutes. [2] (b) Why one cannot suck lemonade on the surface of the moon with a soda straw? [2] (c) State the use of graph in physics. [2] (d) A boy throws a ball vertically upwards. It rises to a height h and then returns to the point from where it was thrown. What is the total distance moved by the ball? Also, find its displacement. [2] (e) On what factors does the time period of a simple pendulum depend? [2] Question 2 (a) A particle is moving with a uniform speed on a circular path. Will it be an accelerated motion? Why? [2] (b) Give one example of each of the following forces which (i) Attract (ii) squeeze (iii) Stretch (iv) pull [2] (c) Give an example where two equal and opposite forces do not form an action-reaction pair. [2] (d) Why does the surface of a lake freeze first? [2] (e) Why is a body with large reflectivity a poor emitter? [2] 1

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