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CBSE Pre Board Class 10 2019 : Science (St Xavier's Sr. Sec. School, Delhi) : Set 1

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Pre Board Examination 2019 Std. 10 08-01-2019 Set 1 SCIENCE Max. Marks : 80 Time : 3 hrs. General Instructions: i) The question paper comprises of five sections A, B, C, D and E. You are to attempt all the sections. ii) All questions are compulsory. iii) Internal choice is given in sections B, C, D and E. iv) Question numbers 1 and 2 in Section-A are one mark questions. They are to be answered in one word or in one sentence. v) Question numbers 3 to 5 in Section- B are two marks questions. These are to be answered in about 30 words each. vi) Question numbers 6 to 15 in Section-C are three marks questions. These are to be answered in about 50 words each. vii) Question numbers 16 to 21 in Section-D are 5 marks questions. These are to be answered in about 70 words each. viii) Question numbers 22 to 27 in Section- E are based on practical skills. Each question is a two marks question. These are to be answered in brief. SECTION A 1. Differentiate between vegetable peel and polythene bag. (Only definition) 1 2. Mention any two substances which are selectively reabsorbed as filtrate flows along the tubular part of nephron. 1 SECTION - B 3. An object 5cm high is held 25cm away from a converging lens of focal length 10 cm. a) Calculate the distance of the position of the image from the lens. b) What is the nature of image formed?i (OR) The refractive index of water with respect to vacuum is 4/3 and refractive index of vacuum with respect to glass is 2/3. If the speed of light in glass is 2x108m/s, find the speed of light in vacuum and water. 2 4. Write balanced chemical equation for the followings: a) K + H2O b) Fe2O3 + Al 2 5. Answer the following: a) Why does bread mold grow profusely on a moist slice of bread rather than on a dry slice? b) What is a clone? 2 SECTION C 6. If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror? 3 7. a) b) What is biogas? Biogas is considered to be a boon to the farmers. Give reasons. Mention any two points that should be kept in mind while settling a wind energy farm. 3 8. a) b) Name a salt whose solution has pH more than 7. Write chemical formula and chemical name for Plaster of Paris. It should be stored in a moisture proof container, explain why? 3 a) b) Why do we store silver chloride in dark coloured bottles? A white compound on heating decomposes to give brown fumes and a yellow residue is left behind. Name the white compound and brown fumes. Write the chemical equation for the reaction. 3 9. 10. In a Guinea pig having black colour 100 offspring are produced. Out of which 75 were black and 25 were white. a) What is the possible genotype of pig? b) Which trait is dominant and which one is recessive? c) What is this cross called? What is the desired ratio of F1 generation?

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