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CBSE Class 10 Pre Board 2018 : Science (St Xavier's Sr. Sec. School, Delhi) : Set 1

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ST. XAVIER'S SENIOR SECONDARY SCHOOL, DELHI - 110054 Pre-Board Examination 2018 in SCIENCE Std. 10 08-01-2018 Set 1 Max. Marks : 80 Time : 3 hrs. General Instructions: i) The question paper comprises two sections, A and B. You are to attempt both the sections. ii) All questions are compulsory. iii) All questions of Section-A and B are to be attempted separately. iv) There is an internal choice in three questions of three marks each, two questions of five marks each and one question of two marks each. v) Question numbers 1 and 2 in Section-A are one mark question. They are to be answered in one word or in one sentence. vi) Question numbers 3 to 5 in Section- A are two marks questions. These are to be answered in 30 words each. vii) Question numbers 6 to 15 in Section-A are three marks questions. These are to be answered in about 50 words each. viii) Question numbers 16 to 21 in Section-A are 5 marks questions. These are to be answered in 70 words each. ix) Question numbers 22 to 27 in Section- B are based on practical skills. Each question is a two marks question. These are to be answered in brief. SECTION - A 1. Write the name and structure of an aldehyde with four carbon atoms in its molecule. 2. Why should bio-degradable and non-biodegradable waste be discarded in two separate dustbins? 3. a) b) 4. a) b) 6. a) a) b) c) 8. a) a) b) 10. What would be the change in resistivity if the wire of length l and area A is doubled on itself? Give any two properties of electric charge. Why do we use nichrome in heating appliances? (2) (2) (1+1+1) What is the purpose of glass sheet in solar cooker? Give any two disadvantages of nuclear energy. What is slurry? Where is it used? (1+1+1) (OR) Explain the three different ways to harness energy from ocean. Write an advantage and disadvantage. (3) b) 9. (2) Write equation for the reaction of iron with steam. Show the formation of MgCl2 by transfer of electrons. (Atomic No. Mg - 12, Cl - 17) State Snell s law. If refractive index of glass and water are 3/2 and 4/3, respectively and speed of light in glass is 2x108 m/s then calculate the speed of light in water. 7. (1) Write an equation for decomposition reaction where energy is supplied in the form of light. Give an example of a reaction which is a double displacement reaction as well as a precipitation reaction. 5. b) c) (1) a) b) What is the power of accommodation of human eye. Give its related diagrams to show accommodation of eye while seeing the far off and nearby objects. A person needs spectacles for reading newspaper. Name the defect he is suffering from. What are the causes of this defect and how can this defect be corrected? (2+1) Describe activity with a well labeled diagram to show that a current carrying conductor experience force in a uniform magnetic field. State the rule to determine the direction of force. Explain the term "overloading of an electric circuit (2+1) Why does dry HCl gas not change the colour of the dry litmus paper? Fresh milk has a pH of 6.When it changes in to curd, will its pH value decrease or increase and why?

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