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# CBSE Class 10 Pre Board 2021 : Science (Kendriya Vidyalaya (KV) No 1, Armapur, Kanpur)

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K.V.NO.1.ARMAPUR FIRST PRE-BOARD (2020-21) CLASS - X -A SCIENCE (SET-I) TIME:3HOURS. GENERAL INSTRUCTIONS: (i) There are total 36 questions divided into four sections A, B, C and D (ii) Section - A: Question no. 1 to 20 - All questions and parts thereof are of one mark each. These questions contain multiple choice questions (MCQs), very short answer questions and assertion - reason type questions (iii) Section - B: Question no. 21 to 26 are short answer type questions, carrying 2 marks each (iv) Section - C: Question no. 27 to 33 are short answer type questions, carrying 3 marks each (v) Section - D: Question no. 34 to 36 are long answer type questions carrying 5 marks each Note: There is no overall choice. However, internal choices have been provided in some questions. SECTION1. Read the following passage and answer any four questions . 1*4= Scattering of Light. 4 . . . . . A When we enter a dark room, usually we cannot see the path of light. But with the help of the laser beam, we are able to see the path. This is due to the scattering of light by small particles of air in the path of the laser beam. The phenomenon in which path of the light incident on the particle is redirected in a different direction this is called scattering of light. Light of shorter wavelengths is scattered much more than the light of longer wavelengths.Sometimes we do wonder why does the sky appear blue? Since the wavelength of the blue color is smaller than the wavelength of the red color, the scattering

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