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ICSE Class X Board Exam 2021 : Physics

5 pages, 67 questions, 60 questions with responses, 60 total responses,    1    0
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FATHER LEBLOND SCHOOL HALF YEARLY EXAMINATION SESSION 2020-2021 CLASS: X F.M:80 PHYSICS (THEORY) TWO HOURS Answer 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. This time given at the head of this paper is the time allowed for writing the answers. ________________________________________________________________________________________________ This paper is divided into 2 sections. Attempt all the questions from section A and any 4 questions from section B The intended marks for questions or parts of the questions are given in brackets [ ]. _____________________________________________________________________________ SECTION A (40 Marks) Attempt all the questions Question 1: (a) Define work. State its S.I. unit. [2] (b) State two differences between centripetal and centrifugal force. [2] (c) A man exerted a force of 100 N in pulling a cart at a constant speed of 20 m/s. Calculate the power spent by the man. [2] (d) On what factor position of centre of gravity of a body depends? What is the position of centre of gravity of a rectangular lamina? [2] (e) What is the difference between uniform circular motion and uniform linear motion? [2] Question 2: (a) A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a diagram and level angle of incidence, angle of reflection and angle of refraction. [2] (b) Which colour of white light, is the refractive index of a transparent medium: (i) Least (ii) Most [2] (c) Give scientific reason: A tank appears shallow than its actual depth. [2] (d) State the essential condition for total internal refection to take place. [2] (e) A pebble kept inside water ( = 4/3) when viewed from air in vertical direction appears to be raised by 3.0 mm. Find the depth of pebble in water. [2] PKM/PHY/X THIS QUESTION PAPER CONSISTS OF 3 PRINTED PAGES TURN OVER

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