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80 MT PHYSICS ICSE 2021 Syllabus Chapter 1 to 71 Time: Hundred Minutes SECTIONI [40 Marks Attempt all questions] Question 1 Two bodies A and B have masses a) in the ratio 5:1l and their kinetic 125:9. Find the ratio of their velocities. [2] ) Name the physical quantity which is measured (ii) How is calorie related to SI unit of that (c) in calories. quantity? 2 couple. () Define critical angle. (1) State one important factor which affects the critical angle of a given medium. (e) 2 (i) Define couple. (i) State the SI unit of moment of (d) energies are in the ratio (2 An electromagnetic radiation is used for photography in fog. ) Identify the radiation. i) Why is this radiation mentioned by you, ideal for this purpose? [21 Question 2 1) What is the relation between the refractive index of water with respect to air (24 ) and the (a) refractive index of air with respect to water (wa) i) If the refractive index of water with respect to air (aHw) is.Calculate the refractive index of air with A man near respect to water (wa). [2 playing a flute is able to produce notes of different frequencies. If he closes the holes mouth, will the pitch of the note produced, increase or decrease? Give a reason. [2] his diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42. Complete the path of the ray PQ till it emerges out of the block. [Write The necessary angles] 42 ww [2]
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