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CBSE Class 10 Pre Board 2021 : Science (R. B. K. School (RBK), Mira Road)

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PRELIMINARY EXAMINATION II (2020-21) SUBJECT: SCIENCE Grade: X Date :07/01/2021 Time: 3 hours Total Marks: 80 General Instructions: (i) The question paper comprises four sections A, B, C and D. There are 36 questions in the question paper. All questions are compulsory. (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. Answers to these should be given in one word or one sentence. (iii) Section B - question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answers to these questions should be in the range of 30 to 50 words. (iv) Section C - question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answers to these questions should be in the range of 50 to 80 words. (v) Section D question no. - 34 to 36 are long answer type questions carrying 5 marks each. Answers to these questions should be in the range of 80 to 120 words. (vi) There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions. (vii) Wherever necessary, neat and properly labeled diagrams should be drawn Section A QNo Mk 1) Why does silver chloride turn grey when exposed to sunlight? 1 2) Write the chemical name of the compound of sodium which is an ingredient in antacids. 1 3) What type of bond does carbon form with other elements? 1 4) Both a spherical mirror and a thin spherical lens have a focal length of (-15 cm). What type of mirror and lens are these? 1 5) A ray of light is incident at angle of 300 with the principal axis at the optical centre of the lens. What will be the angle of deviation. 1 6) A negatively charged particle is moving vertically upwards. When it enters a region of magnetic field directed towards the north, What is the direction of the force on the charge. 1 7) State the phenomenon involved in the blue color of sky. 1 8) Draw a diagram to represent uniform magnetic field in a given region. 1 9) As the object approaches the concave lens from infinity; the image moves from _______ to ________ 1 10) Name the causative agent of the disease kala-azar and its mode of asexual reproduction. 1 11) How does the acidic medium in the small intestine be converted into alkaline for pancreatic enzymes? 1 12) What do you mean by life processes? 1

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