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CBSE Pre Board Class 10 2021 : Science (Matushri Kashiben Vrajlal Valia International Vidyalaya (MKVV), Borivli, Mumbai)

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Ashok Badlani
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MKVV INTERNATIONAL VIDYALAYA PRELIMINARY EXAMINATION- (2020-21) CLASS - X SCIENCE MARKS-80 TIME 3HRS INSTRUCTIONS The question paper has four sections A, B, C, and D. There are 36 questions in the question paper. All are compulsory. Section-A Question no 1 -20 are of objective type ,very short answer and assertion-reason type questions. Section -B Question no 21 -26 are short answer type of 2 marks each. Section -C Question no 27 -33 are short answer type of 3 marks each. Section - D Question no 34 -36 are long answer type of 5 marks each Wherever necessary, neat and properly labelled diagrams should be drawn SECTION -A (16+16 marks) 1. During electrolysis of water, why is the volume of gas collected over one electrode is double than the gas collected over the other electrode? (1) 2. a) Which is stronger, acid with pH= 5 or acid with pH= 2? a) How does the pH change when a solution of base is diluted? (1) 3. Choose the amphoteric oxide among the following. Na O, ZnO, Al O . CO , H O (1) 4. A non-metal X exists in two different forms Y and Z. Y is the hardest known natural substance whereas Z is a good conductor of electricity. Identify Y and Z. (1) 5. Write the molecular formula of benzene and draw its structure (OR) Write the molecular formula of cyclohexane and draw its structure. (1)

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