6. Differentiate: a) Nuclear fission & nuclear fusion. b) Geothermal Energy & Ocean thermal Energy. c) Biogas & Biomass. (3)

Size: px

Start display at page:

Download "6. Differentiate: a) Nuclear fission & nuclear fusion. b) Geothermal Energy & Ocean thermal Energy. c) Biogas & Biomass. (3)"

Bonnie Jackson
5 years ago
Views:

1 Std. 10 SCIENCE Time : 3 hrs. M. Marks : 90 General Instructions : 1. The question paper comprises of four sections A, B, C and D. You are to attempt all the four sections. 2. All questions are compulsory. 3. There is no overall choice. 4. In Section D question numbers from are the multiple choice questions. For each question four answers are provided. Write the correct answer in the box provided. Question numbers should be answered in brief on the same sheet. 5. Marks for each question are mentioned against the question. Section - A 1. What are the limitations of extracting energy from wind? (1) 2. Define power and hence derive its expression in terms of V, I & R. (2) 3. Define magnetic field. Why two magnetic field lines can never cross each other. Draw magnetic field lines due to circular current carrying coil. (3) 4. What is the importance of Earth wire and Fuse wire in domestic electric circuit? An electrician puts a fuse of 5A in heater of rating 2 KW: 220 V. What is likely to happen? Explain. (3) 5. Define electric potential at a point. Calculate potential difference between two points if 2J of work is done to transfer 6.25 x electrons from one point to another. (3) 6. Differentiate: a) Nuclear fission & nuclear fusion. b) Geothermal Energy & Ocean thermal Energy. c) Biogas & Biomass. (3) 7. In a remote village of a hilly State, villagers were facing a lot of problems in daily life as village was not electrified. They were burning wood to keep area lighted during night to keep animals away. This comes to the knowledge of newly appointed collector of district & he immediately installed solar panels in village & lot of problems were solved a) State the values exhibited by collector. b) Explain advantages to villagers due to installation of solar panel. (3) 8. a) Define resistivity. If resistivity of Cu is 1.67 x 10-8 Ωm, what does it signify? b) How many lamps of 10W, 220V can be connected in parallel if allowable current is 10A? (3) 9. What do you mean by electromagnetic induction? Describe an activity to demonstrate this phenomenon by using two coils. Name a device that works on this principle. State the rule used to find direction of induced current. (5)

2 10. a) State Ohm s law. Two resistors R 1 & R 2 such that R 1 > R 2 connected in series & in parallel and their V -I graphs are plotted. Match the lines A; B; C; D with R 1, R 2, R S & R P with reasons. b) Draw a circuit diagram to show connection of two resistors of 5 ohm each, a source of 10 V, a voltmeter, an ammeter so as to obtain maximum value of current from the circuit. Also find readings of A and v (5) Section - B 11. Define combination reaction with example. (1) 12. a) What are Indicators? Give an example of a synthetic indicator. b) While diluting an acid, why is it recommended that acid should be added to water and not water to acid? (2) 13. a) Write any two methods to prevent rancidity. b) What do you mean by balanced chemical equation? c) Name the gas evolved at cathode and anode during electrolysis of water. (3) 14. a) Write any two properties of Ionic compounds. b) Show the formation of Na 2 O from its elements by transfer of electrons. Atomic no. Na - 11, O - 8. c) What are amphoteric oxides? Give example. (3) 15. a) Hydrogen gas is not evolved when a metal reacts with nitric acid, why? b) Complete and balance the following equations: i) Ca + H 2 O ii) Al + O 2 (3) 16. Answer in brief: a) Give an example of hydrated salt. b) What is baking powder? c) Name the acid present in bee sting. d) If soil is acidic, which compound would you spread to treat the soil? e) Name the process to prepare NaOH. f) What is chemical name of Plaster of Paris? (3) 17. a) A white colour compound is heated strongly; it decomposes to give brown fumes and yellow residue. Name the (i) white salt (ii) brown fumes, b) Translate the following statements in to chemical equations and then balance them: i) Hydrogen + Nitrogen Ammonia ii) Barium chloride + Potassium Sulphate Barium sulphate + Potassium chloride (3) 18. a) What is milk of magnesia? What is its use? b) Write an equation for the preparation of bleaching powder. c) A milk man adds a very small quantity of baking soda to fresh milk. Why this milk does take a long time to set as curd? d) Which gas is liberated when an acid reacts with a metal carbonate? V A B C D I

3 Explain giving equation. How will you test the presence of this gas? ( ) 19. a) What do you mean by Enrichment of Ore? b) Differentiate between Roasting and Calcination. c) Name the metal which is i) Liquid at room temperature ii) Good conductor of heat d) Draw neat and labeled diagram (ONLY) for the electrolytic refining of impure copper. Section - C ( ) 20. Why is the use of iodised salt advisable? (1) 21. What are the components of transport system in human beings and what are the functions of these components? (2) 22. a) What is the difference between reflex action and walking? b) Draw neat and labelled diagram of reflex arc. (3) 23. Describe the structure and functioning of Nephron. How is the amount of urine produced regulated? (5) 24. What are plant hormones? How are the moment of leaves of the sensitive plant different from movement of shoot towards light? Describe an experiment to demonstrate hydrotropism. (5)

4 - - Name : Sec. Roll No: SECTION - D TIME : 20 min. 25. Two resistors are connected in series as shown in the diagram. The potential difference across 12 Ω resistor will be : a) 6 V b) 2.4 c) 2.8 V d) 12 V (1) 26. A wire of resistance R is cut into ten equal parts which are then joined in parallel then the equivalent resistance of combination is: a) 0.01 R b) 10 R c) 0.1 R d) 100 R (1) 27. Out of the two circuits given below, the two resistors X and Y have been correctly connected in series in the circuit: a) (I) b) (II) c) both (I) and (II) d) none of these (1) 28. Bottle A contains dil. NaOH solution and bottle B contains lemon juice. When ph paper is added in each of the solution, the colour seen in bottle A and B respectively are a) Blue and orange b) Blue and green c) Red and blue d) Green and red (1) 29. The products of reaction between Zinc and Sodium hydroxide are a) Sodium carbonate + water b) Sodium zincate + water c) Zinc hydroxide +hydrogen d) Sodium zincate + hydrogen (1) 30. When water is added in a vessel containing lump of CaO, it is observed that a) the vessel becomes hot b) a hissing sound is produced c) lump of quick lime breaks and dissolves partially in water d) all the above. (1) 31. What is the function of KOH in an experiment carbon dioxide is necessary for photosynthesis? a) To absorb Carbon di oxide; b) To absorb water; c) To absorb air; d) None of the above. (1) 32. Photosynthesis in plants requires (1) a) Carbon di oxide; b) Chlorophyll; c) Sunlight; d) All of the above. 33. The Ganogs photoscreen is used in an experiment to block (1) a) Water; b) Chlorophyll; c) Light; d) None of the above.

34. Draw circuit diagram used for experimental verification of ohm s law. What would happen if ammeter is connected in parallel across the resistor? (2) 35.

5 34. Draw circuit diagram used for experimental verification of ohm s law. What would happen if ammeter is connected in parallel across the resistor? (2) 35. Four test-tubes containing different solutions and different metals are shown in the figure. a) In which of the test tubes reaction will take place? b) Arrange these metals in increasing order of their reactivity. (2) 36. What is the function of stomata in plants? Give its shape in dicot plants. (2) Q. No Answers Note : Write the answers to the questions on back side of this sheet. -x-x-x-x-x-x-x-x-x-

KENDRIYA VIDYALAYA SANGATHAN, HYDERABAD REGION

KENDRIYA VIDYALAYA SANGATHAN, HYDERABAD REGION SAMPLE PAPER 04 FOR SA I (2016-17) SUBJECT: SCIENCE BLUE PRINT : SA-I CLASS X Unit/Topic Chemical Reactions and Equations Acids, Bases and Salts Metals and