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CBSE Class 10 Pre Board 2020 : Science - Prelim 1 (Kendriya Vidyalaya (KV) Agra)

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KENDRIYA VIDYALAYA SANGTHAN, AGRA REGION Pre-Board Exam-2019-2020. Class X Science -086 Time -3 hours SET-D M.M.-80 General Instructions1. The question paper comprises three sections A, B and C. Attempt all sections. 2. All questions are compulsory. 3. Internal choice is given in each section. 4. All questions in section A are one-mark comprising MCQ. VSA and assertionreason type. They are to be answered in one word or in one sentence. 5. All questions in section B are three-mark, short answer type questuins. These are to be answered in about 50 or 60 words each. 6. All questions in section C are five marks, long answer type questions. These are to be answered in about 80 to 90 words. 7. This paper consists of a total of 30 questions SECTION A 1 What are amphoteric oxides? Or What is the compositon of aqua regia solution? 2 Name the phenomena responsible for rainbow formation? 1 1 3 The endocrine glands are in different parts of body. The hormones produced by endocrine glands work as messengers between the nervous system and the organs of our body When we are faced with a dangerous situation (like being chased by a dog (then our nervous system stimulates a gland to secret a hormone in to the blood. This hormone increases our heart beat and breathing rate. Blood flows in to muscles and cause liver to put more stored glucose into our blood. This hormone prepares our body to fight an enemy. Page 1 of 9

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