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# CBSE Pre Board Class 10 2019 : Science (St Xavier's Sr. Sec. School, Delhi) : Set 2

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Pre Board Examination 2019 Std. 10 08-01-2019 Set 2 Max. Marks : 80 Time : 3 hrs. SCIENCE 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. 2. In the following food chain, if 5 J of energy is available to man, how much energy will be available to plants? Plants sheep man 1 Name the green dot like structure in some cells observed by a student on a leaf slide. What is the green color due to? 1 SECTION B 3. A concave lens of focal length 15 cm forms an image at 10cm from the lens. a) Calculate the distance of the object from the lens b) What is the nature of image formed? (OR) The absolute refractive indices of two media A and B are 2.0 and 1.5 respectively. If the speed of light in medium B is 2x108 m/s. Calculate the speed of light in vacuum and in medium A. 2 4. Write balanced chemical equation for the following: a) Ca + H2O b) 5. MnO2 + Al 2 Answer the following questions: i) Colonies of yeast fail to multiply in water but multiply in sugar solution. Give one reason. ii) Where is the Zygote located in the flower after fertilization? 2 SECTION C 6. It is desired to obtain an erect image of an object using concave mirror of focal length of 12cm. a) What should be the range of distance of an object placed in front of the mirror? b) Will the image be smaller or bigger than the object? Give the related diagram. c) Where will be the image of this object formed if the object is now placed at 24cm from the mirror? Give the characteristics of the image formed in this case 3 7. Explain briefly: a) Ocean thermal energy b) Geothermal energy 8. 9. a) b) a) b) c) 3 Tap water conducts electricity where as distilled water does not. Why? What is meant by water of crystallization? Write the common name and chemical formula of a commercially important compound which has ten molecules of water of crystallization. 3 A green coating develops on the copper vessel in the rainy season. Why? A solution of substance X is used for white washing. i) Name the substance X and write its formula. ii) Write the reaction of the substance X named in (i) with water. 3

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