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SMT SULOCHANADEVI SINGHANIA SCHOOL,THANE CLASS 10 EXAM SUBJECT MARKS PRELIMINARY PHYSICS 80 TIME 2 hours PAGES 5 DATE 22.01.21 This paper has two sections of 40 marks each. Section I has 4 compulsory questions. Section II has 6 questions. Attempt any 4 questions. SECTION I (40 MARKS) Each question carries 2 x 5 = 10 marks. Q1. a) A couple is always needed to produce a rotation. Justify the statement with the example of opening a door. b) State the conditions required for equilibrium. c) Draw a graph showing the variation of angle of deviation with angle of incidence for refraction of light through a glass prism. d) Explain why stringed musical instruments are provided with a hollow box. e) Compare the MA of a single fixed pulley to MA of a single movable pulley. State an advantage of a single fixed pulley over a single movable pulley. Q2. a) What is the energy conversion ini) microphone ii) photosynthesis b) Is it possible to have accelerated motion with constant speed? Explain. c) Calculate the power of an engine required to lift 50000 kg of coal per hour from a mine 360m deep. (g = 10 m s-2) d) A parallel air slab is trapped in a glass block. A ray of light is incident from glass into the air slab at an angle = 60 degree from the surface. Draw a ray diagram showing the path of this ray as it emerges out from air to glass. 1
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