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CBSE Class 10 Board Exam 2024 : Science

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PERIODICTEST II (Half Yearly Examination) GRADE-X SUB: Science TIME - 3 HOUR. MAX MARKS 80 General Instructions: i. This question paper consists of 39 questions in 5 sections. questions. Astudent is expected to attempt ii. Allquestions are compulsory. However, an internal choice is provided in some only one of these questions. iii. Section Aconsists of 20objective type questions carrying I mark each. questions should in the range of30 iv. Section B consists of 6 Very Short questions carrying 02 narks each. Answers to these to 50 words. Answers to these questions should in the range v. Section C consists of 7 Slhort Answer type questions carrying 03 marks each. of50 to 80 words each. Answer to thesequestions sho:ld be in the vi. SeciionD consists of 3Long Answer type questions carrying 05 marks range of 80to 120 words. with sub-parts. vii. Section E consists of3 source-based/case-based units of assessnment of 04 marks each 1x20 Section A for each of the questions Select and write one most appropriate option out of the four options given 1-20 formation of a rainbow? 1. Which of the following phenomena of light are involved in the a. Reflection, refraction and dispersion b. Refraction, dispersion and total internal reflection c. Refraction, dispersion and internal reflection d. Dispersion, scattering and total internal reflection 2. The clear sky appears blue because a. Blue light gets absorbed in the atmosphere. b. Ultraviolet radiations are absorbed in the atmosphere. the atmosphere. ,c. Violet and blue lights get scattered more than lights of all other colours by lights by the atmosphere. d. Light of all other colours is scattered more than the violet and blue colour occurs at the 3. When light rays enter the eye, most of the refraction c. Iris a.Crystalline lens d. Pupil b. Outer surface of the cornea 4. The focal length of the eye lens increases when eye muscles a. Are relaxed and lens becomes thinner b.Contract and lens becomes thicker c. Are relaxed and iens becomes thicker d. Contract and lens becomes thinner 5. Focal length of aplane mirror is c. 25cm a. 0 d. -25 cm b. Infinite 6. Image formed by a convex spherical mirror is: a. Virtual c. Enlarged b. Real d. Inverted 7. Which of the following statements about the given reaction are correct ? 3Fe(s) +4H20(g) >Fes0+(s) +4H2(g) ) Iron metal is getting oxidised (ii) Water is acting as reducing agent a. (i), (ii) and (ii) " c. (i), (ii) and (iv) i ) Water is getting reduced fiv) Water is acting as oxidising agent b. (ii) and (iv) d. (ii) and (iv). 8. Which of the following are combination reactions ? ()) 2KCI03 ->2KCI +30 (i)Mg0 +H20 >Mg[OH)2 (iii) 4Al + 302 - > 2Alz03 (iv) Zn + FeSO4>nSO4 +Fe a. (1) and (ii) b. (iii) and (iv) c. (ii) and (iv) od. (ii) and (ii). 9. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change ? a. Baking powder b.Lime c. Ammonium hydroxide solution "d. Hydrochloric acid 10. In thermite welding amixture of ....a.nd...isignited with aburning magnesium ribbon which produces molten iron metal as large amount of heat is evolved. +a. iron (II) oxide and aluminium powder b. iron (I)oxide and aluminium powder c. iron (II) chloride and aluminium powder d. iron (Il) sulphate and aluminium powder 11. Which of the following salts does not contain any water of crystallisation? e a. Blue vitriol b. Baking soda c. Washing soda d. Gypsum 12. Extraction of highly electropositive metal is done by a. Electrolysis of aqueous solution of metal chloride b. Electrolysis of molten metal chloride c. Carbon reduction of the oxide of the metal d. Strongly heating the oxide of the metal. 13. The correct statementsewith references to single celled organisms are a. Complex substances are not broken down intosimpler substances. b. Simple diffusion is sufficient to meet the requirements of exchange of gases. c.Specialized tissues perform different functions in the organism. d. Entire surface of the organism is in contact with the environment for taking in food. 14. The autotrophic mode of nutrition requires a. Carbon dioxide and water b. Chlorophyll .d. All of these c. Sunlight 15. Which of the following is a plant hormone? a. Insulin b. Oestrogen c. Thyroxin d. Cytokinin 16. In humans, the life processes are controlled and regulated by: a. Reproductive and endocrine system c. Endocrine and digestive system b. Respiratory and nervous system "d. Nervous and endocrine system 0. no 17 to 20 are Assertion - Reasoning based questions. These consist of twostatements - Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) Ais true but Ris false. (d) A is false but R true. 17. Assertion (A) : Light does not travel in the same direction in all the media. Reason (R):The speed of light does not change as it enters from one transparent medium to another. Page 2of5 18. Assertion (A) :The chemical formula of bleaching powder is Ca0di. Reason (R): Calcium oxidereact[ with chlorine to form bleaching powder. 19. Assertion (A): An embryo is formed from fertilized egg. 20. Assertion (A): ur body maintains blood sugar level. Reason (R): Amonocot embryo comprises embryonal axis with two cotyledons. Reason RJ: Pancreas secretes insulin which helps to regulate blood sugar levels in the body. Section B 2x6=12 Very short answer questions 21. Define electric current. 22. Define one ampere. 23. What is chlor-alkali process? Write chemical equation. . 24. What happens when a piece of (a) zinc metal is added to copper sulphate solution ? (b) silver metal is added to copper sulphate solution ? Also write the balanced chemicalequation if the reactionoccurs. 25.Define neuron. Name the part ofneuron where: Information is acquired. i) Impulse must be converted into chemical signal for onward transmission. ii) 26. a) What is the fate of the ovules and ovary in a flower after fertilization? b) How is the process of pollination different from fertilization? Section C 3x7=21 Short answer questions 27. Name the type of mirror used in the following situations. (a) Headlights of a car (b) Side/rear-view mirror of a vehicle (c)Solar furnace Give reason for your answer 28.Find the focal length ofalens of power -2.0 D. What type of lens is this? OR State the function of each of the following parts of human eye: () Cornea (i)Iris (iii)Pupil 29. Salt 'A' commonly used in bakery products on heating gets converted into another salt 'B which itself is used for the removalof hardness of water and agas 'C' is evolved. The gas C when passed through lime water, turns it milky. ldentify A, Band C. also write the chemical equation for the reaction. 30. On heating blue coloured powder of copper (1) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas Xis formed (a) Write a balanced chemical equation of the reaction. (b) Identify the brown gas Xevolved. (c) Identify the type of reaction. 31. Answer the following a. Allores are minerals but all minerals are not ores. Justify. b.Distinguish between 'roasting' and 'calcination'. Page3 of5 32. Name the type of asexual reproduction in c. Spirogyra d. Hydra a. Planaria b. Rhizopus Or, a. What is translocation? Why is it essential for plants? b. Where do the substances in plants reach as a result of 33. translocation? a. Give the functions of cerebellum (any two). b. Name the components of central nervoussystem? 5x3=15 Section D Long answers questions unit. What is meant by 1 ohm resistance? 34.State and explain Ohm's law. Define resistance and give its SI Draw V-l graph for an ohmicconductor and list its two important features. Or Explain in brief the reason for each of the following: a. Advanced sun-rise 35. b. Delayed sun-set c. Twinkling of stars a. Why does not a wallimmediately acquire a white colour when a coating of slaked lime is applied on it? b. Awhite coloured powder is used by doctors for supporting fractured bones. i.Write chemical name and formula of the powder. ii. When this white powder is mixed with water a hard solid mass is obtained. Write balanced chemical equation for the change. .Draw and label a neuron. Explain how it carries messages. Or Draw a labelled diagram of human brain. Discuss functions of cerebrum, cerebellum and medulla. SectionE 4x3=12 (Q.no. 37 to 39 are case -based/data -based questionswith 2 to 3short sub -parts. Internal choice is provided in one of these sub-parts. ) 37. The lenses form different types of images when objects are placed at different locations. When a ray is incident parallelto the principal axis, then after refraction, it passes through the focus or appears tocome from the focus. When a ray goes through the optical center of the lens, it passes without any deviation. If the object is placed between the focus and the optical center of the convex lens, an erect and magnified image is formed. As theobject is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of the image goes on increasing and the image is always real and inverted. Aconcave lens always gives a virtual, erect, and diminished image irrespective of the position of the object. Answer the following questions based on the given information. (1 mark each) (1)The location of image formed by a convex lens when the object is placed at infinity i_ (a) at focus (b)at 2F (c) at optical center (d) between F and 2F (i1) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b)virtual and inverted (c) virtual and smaller (d) real and erect (iii) The size of image formed by a convex lens when the object is placed at the focus of a convex lens is (c) highly magnified (a)small (d) same as that of object (b)point in size of image is loation the iv) When the object isplaced at 2F in front of a convex lens, (c) at infinity (a) at F (d) between F and optical center (b)at 2 F on the other side decreasing order of their reactivities is called the the in column vertical a metals in arrangement of The 38. at the top position of the reactivity reactivity series or activity series of metals. The most reactive metal is series. The least reactive metal is at the bottom of the reactivity series. metals only for comparison. Apart Hydrogen, though a non-metal, has been included in the activity series of form cation which behaves like valence electron and from it, the hydrogen atom also has tendency to lose its metal H H+ +e Answer the following questions based on the given information: solution? () Which metal can be displaced by copper from its salt a. zinc c. Iron b. Silver (ii) An element 'X after reacting with acids liberates hydrogen their salt solutions. The metal 'X' is b. Gold a. Copper (1mark each) d. Lead gas and can displace lead and mercury from d. Hydrogen c. Calcium (iii) The most reactive metal is a. Potassium b. Barium c. Zinc (iv) The metal which does not liberate hydrogen gas after reacting with a. Zinc d. Calcium acid is c. Iron b. Lead all? (v) Which of the following metals does not react with water at IV, Lead L.Sodium II. Copper III. Aluminium c. IIand IV only b. IV only a. Iand IIIonly d. Gold d. I, II, IIL, and IV small amount. These chemicals There are some chemicals in human body that are secreted in very present in the human body. are known as Hormones. Hormones are secreted from the specialised tissue, 39. These specialised tissues are known as endocrine glands. Hormones control the growth as well as they help body in very small in the coordination of the activities ofliving organisms. Hormones are produced inside the quantity. They have their effect at the site different from the site where they are made. (1mark each) Answer the following questions based on the given information. Which of the following hormone prepares our body to foundation at maximum efficiency during () emergency situation? a. Pineal hormone b.Pituitary hormone d. Thymus C. Adrenaline hormone Which of the following collects the information from the brain and blood vessels? (ii) a. Pituitary hormone b. Hypothalamus d. Allof these c. Endocrine gland Which of the following disease is caused by the deficiency of insulin hormone? (ii) a. Blood pressure (iv) b. Diabetes c. Pneumonia / d. Liver failure The amount and timing of hormone released by various gland are controlled by ********k***************** 5etwe.

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