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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 (A) Name the hormone and the gland which secrets it? 1 (B) Location of this gland is 1 (I) In the throat region (ii) on the kidney (iii) on the testes (iv) Below the brain (C) Write any one difference between endocrine exocrine glands. 1 (D How does increased breathing rate help to face the problem? 1 (4)- Which of the given elements A, B, C, D and E with atomic number 2,3,7,10 and 30 belongs to same period(a) A B C (c) A D B (b) B C D (d) B D E 1 (5)- The decomposers in an ecosystem(a) convert inorganic material into simpler form. (b) convert organic material into inorganic material. (c) convert inorganic material in to organic material. (d) Don t breakdown organic compounds. Page 2 of 9 1 OR How much average amount of organic matter is available when food is consumed by next tropical level? (a) 1% (b) 10% (c)20% (d) 25% (6) Which famous movement was started by women of Rani village in Garhwal? (a) Bishnoi movement (b) Chipko movement (c) Appiko movement (d) Bahuguna movement 1 (7) Which one of the following is a non renewable Source of energy(a) wood (b) sun (c) Fossil fuel (d) Wind 1 (8) Geothermal energy is feasible in regions that(a) are near the sea (b) have thermal plant (c) have coal mines (d) are over hot spots in the crust 1 (9) Electric current is flowing through a wire in east to west direction. The direction of magnetic field at a point directly above it is from(a)North to South (b) South to North (c) West to East (d)North to west OR The magnetic field inside a long straight current carrying solenoid is (a) Zero (b) Decreases as we move towards the end (c) Increases as we move towards the end (d) Remain same at all points Page 3 of 9 1 10. Akshay takes 5 ml of distilled water in four test tubes he dissolves sodium chloride in test tube A, calcium chloride in test tube B magnesium chloride in test tube C and potassium chloride in test tube D. Scum will be found with soap in test tube . (A) test tube A and D (B) test tube B and C (C) test tube C only (D) test tube B only 1 The following questions consists of two statements Assertion A and Reason R. Answers these questions selecting the appropriate option given below (a) both A and R true and R is correct explanation of A (b) both A and R are true, but R is not correct explanation of A (c) A is true but R is false (d) (d) A is false but R is true 11 Assertion A Salts are the product of acid and base reaction. Reason R- Salts may be acidic or basic. 1 12 Assertion A- We can use detergents as cleansing agent with hard water, Reason R- Detergents are biodegradable. 1 13 Barium chloride on reacting with sodium sulphate forms barium sulphate and sodium chloride. Which of the following correctly represents the type of reaction /reactions involved. I Displacement iii Combination ii Precipitation iv Double displacement (a) I only (b) ii only (c) iii and iv only (d) ii and iv only Page 4 of 9 1 14 Mr. Ashok purchased a flat having three rooms, one kitchen and two toilets. Each room has a fan of 80Wand two tube lights of 40 watt. While kitchen and toilets have 40W tube lights only. In sitting room there is an AC of 1500w. He also uses an oven of 750 watt to bake. A. Mr. Ashok must take a connection of electricity at-least having load (a) 2 KW (b) 2.5 KW (c) 3KW (d) 4 KW 1 B. If appliances of all three rooms are used for 6 hours a day and cost of electricity consumed is Rs. 6 per unit, what will be the cost of energy consumed in the month of June. 1 C. What may be the reason for high electricity bill during summer depicted in the below graph?1 D. Name two safety devices commonly used in electric circuit and appliances. 1 SECTION B 15. (a) Name the instrument that measure electric current in a circuit. Also write unit of current. (b) Write the relationship between resistance and electrical resistivity of a material of a conductor in the shape of a cylinder of length L and area of cross section A. hence drive the SI unit of electrical resistivity. 3 OR (a) How is voltmeter connected in the circuit to measure potential difference between two points? (b) A copper wire has diameter 0.5mm and resistivity of 1.6*108 ohm-m. What will be the length of this wire to make its register 10 ohm? Page 5 of 9 16 A metal compound X react with Sulphuric acid to produce effervescence. The evolved gas extinguishes a burning candle. If one of the compounds formed is calcium sulphate, then what is X and gas evolved. Write a balanced chemical equation for the reaction. 3 17. What happens when: (a) Gypsum is heated at 373 k, Write equation also. (b) electricity is passed through an aqueous solution of sodium chloride 3 OR (a) Arrange five solutions A, B, C, D and E have pH 2,1,11,8 and 7. Arrange the solution in increasing order of their hydrogen ion concentration. (b) Give two important uses of washing soda and baking soda. 18. Atomic numbers of two elements are given below 12 and 17 (a) Identify the elements with their group numbers (b) Which of these elements has smaller atomic size and why? 3 OR State Mendeleev s periodic law. What are the limitations of this law? (any two) 19What are different ways in which glucose is oxidized to provide energy in various organisms? 20 (a) what are trophic levels? Give an example of food chain and state the different trophic levels in it. (b) What is biological magnification? 3 21. What is speciation? List four factors that could lead to speciation? 3 Page 6 of 9 22. Define(a) The principal focus of a concave mirror (b) Refractive Index (c) Power of lens 3 23. (a) Name one gustatory receptor and one olfactory receptor present in human being (b) Write name A and B in the given flow chart of neuron through which information travels as an electrical impulse Dendrite A B Nerve ending. 3 (for visually impaired)Write parts of a neuron through which information travels from dendrite to nerve ending. 24. Akshita needs a lens of power 4.5 D for correction of her vision. (a) What kind of defect of vision is she suffer from? (b) Draw ray diagram showing the defected eye and correction for the defect. 3 PART C 25 (A) Give reason (I) Platinum and gold are used to make jewelry. (ii) Iron Grill should be painted frequently. (B) How is pure copper purified by electrolytic refining? Draw a labeled diagram to illustrate it.5 26. Select hydro carbons which are members of the same homologous series. Give the name of each series. C 3H8 C 6H12 C5 H10 C 8H18 (b)When ethanol reacts with ethanoic acid in presence of sulphuric acid a substance with fruity smell is produced. Answer the following (i) State the class of compounds to which the fruity smelling compound belongs. Write the chemical equation for the reaction and write the chemical name of compound formed. Page 7 of 9 (i) state the role of conc. H2SO4 in this reaction. 5 27 (a) Define excretion. (b) Name the basic filtration unit presents in the kidney? Draw diagram of Excretory system and label the organs of excretory system which perform following functions (i) form urine. (ii) store urine until it passes out. (iii) tube which collect urine from kidney. OR (a) Sectioned view of the heart is given. Label the parts which carry oxygenated blood and deoxygenated blood. (b) Explain the process of double circulation with the help of flow chart. 5 28.(a) Explain four advantages of vegetative reproduction. (b) What is contraception. How does the use of these methods have a direct effect on the health and prosperity of a family? OR Page 8 of 9 (a) Describe the role of testes, Vas deferens and seminal vesicle in the male reproductive system? (b) What is placenta? Explain its function in human. 5 29.(i) Why is an ammeter likely to burn out if it is connected in parallel in a circuit? (ii) Why are copper and aluminum wires usually used for electric wire? (b) How will you infer with the help of an experiment that the same current flow through every part of a circuit containing three resisters in series connected to a battery? 5 30. (a) The speed of light in water in water is 2.25 x 108 If the speed of light in vacuum be 3 x 108 m/s. Calculate the refractive index of water? (b) Find the size nature and position of image formed when an object of size 1 cm is placed at 15 cm from a concave mirror of focal length 10 cm. Also draw ray diagram for it. OR (a) Name the type of mirror used in following and support your answer with reason(i) Side/rear view mirror of vehicle (ii) Solar furnace (b) The Power of a lens is +5 diopter. What is the focal length of this lens? At what distance from the lens should an object be placed to get its inverted image of same size? Magnification produced by a plane mirror is +1. What does it mean? END OF PAPER. Page 9 of 9 5

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