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ST. JOHN S UNIVERSAL SCHOOL FIRST PRELIM 2020-2021 Class: X Physics Date :14/10/2020 Time : 2 hours Marks : 80. Answers to this paper must be written on a ruled sheet. First 10 minutes are to be spent in reading the question paper. The time given at the head of this paper is for writing and uploading the paper. The Answer Sheet should have the following details mentioned - Date , Full Name,Class & Div. The pages should be numbered appropriately. Section A All Questions Compulsory Question 1 a. What is the SI unit of i)moment of couple ii) Power [2M] b. State two conditions of equilibrium [2M] c. What is the position of centre of gravity i)solid cone ii)triangular lamina [2M] d. What force provides the necessary centripetal force in the following case: i. motion of planet around sun ii. Stone tied at the end of the string [2M] e. Sate any two functions of Machines. [2M] Question 2 a.State two condition for light to pass as an undeviated ray. [2M] b. State two factors effecting refractive index . [2M] c. State two advantages of reflecting telescope over a plane mirror as reflector . [2M] d. State any two uses of UV rays. [2M] e. State any two application of lenses . [2M] Question 3
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