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A.G.C. School, Rupaidiha Preliminary Examination 2020-2021 SCIENCE Paper (PHYSICS) 1 (Two Hours) Maximum Marks: 80 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 this Paper is the time allowed for writing the answers. ____________________________________________________________________ Attempt all the questions from Section I and any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. ____________________________________________________________________ SECTION I (40 Marks) Attempt all questions from this Section. Question 1 (a) Study the diagram alongside carefully and calculate the resultant moment of force about (a) point P and (b) point R which is exactly in the middle of the two processes. [2] (b) State the energy changes in the following cases while in use: (i) A piece of magnesium burns in air, (ii) Food eaten by human. (c) (i)What is normal reaction force? (ii) How are gravitational units of force related with the absolute units of force (d) State two factors affecting the turning effect of force. (e) State work energy theorem. Write a mathematical relation expressing it. Question 2 (a) Draw a diagram to show how a single pulley can be used so as to have its ideal Mechanical advantage is equal to 2 (b) Establish the relation MA = VR x . (c) Define specific heat capacity and state its SI unit. [2] [1] [1] [2] [2] [1] [1] [2]
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