SECTION-B<\/strong><\/p>\nQuestion 22. \nFor preparing a true solution, the given set up was done. What is \u2018A\u2019, \u2018B\u2019 and \u2018C\u2019? \n <\/p>\n
Question 23. \nThe following diagram gives the structure of a nerve cell. Identify the parts labelled as A, B and C respectively. \n <\/p>\n
Question 24. \nGive two functions of osmosis.<\/p>\n
Question 25. \nRepresent a wave with low and high amplitude.<\/p>\n
Question 26. \nHow the presence of an air bubble in the liquid taken in the measuring cylinder can affect the volume of the solid?<\/p>\n
Question 27. \nA rectangular body has dimensions x and y (l and b). If its dimensions get doubled, what will happen to its volume?<\/p>\n
Answers<\/strong> \nSECTION-A<\/strong><\/p>\nAnswer 1. \nCommercial Unit of Energy : Kilowatt hour \n1 kilowatt hour = 3.6\u00a0\u00d7 106<\/sup> Joules<\/p>\nAnswer 2. \nCFC (Chloro Fluoro Carbon)<\/p>\n
Answer 3.<\/p>\n
\n\n\nMass<\/strong><\/td>\nWeight<\/strong><\/td>\n<\/tr>\n\n(i) Mass of an object is the quantity of matter contained in it.<\/td>\n Weight of an object is the force with which it is attracted towards the centre of the Earth.<\/td>\n<\/tr>\n \n(ii) It remains constant everywhere.<\/td>\n It changes from place to place with the value of \u2018g\u2019.<\/td>\n<\/tr>\n \n(iii) It can never be zero.<\/td>\n It can be zero.<\/td>\n<\/tr>\n \n(iv) Its S.I. unit is kg.<\/td>\n Its S.I. unit is newton.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nAnswer 4.<\/p>\n
\nAll cellular processes takes place in water as a medium. The reactions that take place within our body cells occur between the substances that are dissolved in water.<\/li>\n Water is an excellent solvent. Substances are also transported from one part of the body to the other part in dissolved form.<\/li>\n<\/ol>\nAnswer 5. \nTransverse waves are the waves in which particles of the medium vibrates at right angle to the direction of propagation of wave. \nExample:<\/strong> Water waves\/waves set up in a rope whose one end is fixed and the other is jerked. (Or any other appropriate example) \nOn the contrary longitudinal waves are those waves in which particles of the medium vibrates in the same direction as that of the wave. \nExample:<\/strong> Compressed spring. (Or any other appropriate example)<\/p>\nAnswer 6. \nNo. of waves = 20 \nDistance between a compression and the next rarefaction is half of the wavelength. \n <\/p>\n
Answer 7.<\/p>\n
\nEarthworm:<\/strong> Annelids, as its body is segmented.<\/li>\nScorpion:<\/strong> Arthropoda, as it has joint appendages.<\/li>\nStarfish:<\/strong> Echinodermata, as it has calcareous skeleton and tubefeet.<\/li>\n<\/ol>\nAnswer 8. \nPower is the rate of doing work, i.e. the amount of work done per unit time. \nS.I. unit: Watt \nIf a bulb is rated 15 watts, it means it consumes 15 joules energy per second. \nTherefore, Power = \\(\\frac { Energy }{ Time }\\) \nSo, Energy = Power x Time \nTherefore, energy consumed by the bulb = 15\u00a0\u00d7 (10\u00a0\u00d7 60) \n= 15\u00a0\u00d7 600 \n= 9000 Joules or 9 kJ<\/p>\n
Answer 9.<\/p>\n
\n\n\nSclerenchyma<\/li>\n Lignin<\/li>\n<\/ul>\n<\/li>\n Sclerenchyma consists of dead cells\/with very thick walls\/provides strength to plant parts. Parenchyma consists of living cells\/with thin cell walls\/stores food.<\/li>\n<\/ol>\nAnswer 10. \nUniversal law of gravitation states that every body in this universe attracts every other body with an the force of gravitation is directly proportional masses of two interacting bodies and is inversely proportional to the square of distance (d2<\/sup>) between them. \nForce of sun on earth is, \n \nForce of the earth on the sun is the same.<\/p>\nOR<\/strong> \n(a)<\/strong> Time of ascent is equal to the time of descent. The ball takes a total time of 6 seconds for its upward and downward journey. \nHence, it has takes 3 seconds to attain the maximum height. \nFinal velocity of the ball at maximum height, v = 0 \nAcceleration due to gravity, g = – 9.8 ms-2<\/sup> \nAs per the equation of motion, v = u + gt \n\u21d2 0 = u + (- 9.8\u00a0\u00d7 3) \nu= 9.8\u00a0\u00d7 3 \n= 29.4 ms-1<\/sup> \nHence, the ball was thrown upwards with a velocity of 29.4 ms-1<\/sup><\/p>\n(b)<\/strong> Let the maximum height attained by the ball be h. \nInitial velocity during the upward journey, u = 29.4 ms-1<\/sup> \nFinal velocity, v = 0 \nAcceleration due to gravity, g = – 9.8 ms-2<\/sup> \ns = ut + \\((\\frac { 1 }{ 2 } )\\)at2<\/sup> \nFrom the equation of motion, \nh = 29.4\u00a0\u00d7 3\\((\\frac { 1 }{ 2 } )\\)x – 9.8\u00a0\u00d7 (3)2<\/sup> = 44.1 m<\/p>\nAnswer 11.<\/p>\n
\n\n\nDensity<\/strong><\/td>\nRelative Density<\/strong><\/td>\n<\/tr>\n\n(i) It is defined as mass per unit volume.<\/td>\n (i) It is defined as the ratio of density of the substance to the density of water at 4\u00b0C.<\/td>\n<\/tr>\n \n(ii) Its value is different in different systems of measurement.<\/td>\n (ii) Its value remains the same in all systems of measurement.<\/td>\n<\/tr>\n \n(iii) Its units are g cm-3<\/sup> and kg m-3<\/sup>.<\/td>\n(iii) It has no units.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nRelative density of silver =10.8 \nDensity of water = 103<\/sup> kg m-3<\/sup> \nRD = \\(\\frac { Densityofsilver }{ Densityofwater }\\) \nHence, Density of silver = RD\u00a0\u00d7 Density of water \n= 10.8\u00a0\u00d7 103<\/sup> kg m3<\/sup> = 1.08\u00a0\u00d7 104<\/sup> kg m-3<\/sup><\/p>\nAnswer 12. \nThe gases released due to combustion of fossil fuels are SO2<\/sub>, NO2<\/sub>, CO2<\/sub>, etc. These gases remain suspended in the air. \nAnd when it rains the rain water mixes with these gases to form sulphuric acid, nitrous acid, carbonic acid and came down on the surface of the earth in the form of rain called the acid rain. \nHarmful effects of acid-rain:<\/p>\n\nIt corrodes statues, monuments of marble, building etc.<\/li>\n It makes the soil acidic.<\/li>\n It damages crops, plantations.<\/li>\n<\/ul>\nAnswer 13.<\/p>\n
\nAlloys are classified in the category of homogeneous mixtures as the combined constituents cannot be easily distinguished.<\/li>\n A solution obtained when a solute (solid\/liquid or gas) dissolves in the liquid solvent is a liquid solution. However, it is not always true. For instance, in the formation of alloys solids are mixed to form a solution.<\/li>\n No, as a solution is formed by dissolving one substance into another substance.<\/li>\n<\/ol>\nAnswer 14.<\/p>\n
\nIt changes the nature of the soil.<\/li>\n It lowers the water holding capacity of soil.<\/li>\n The chemical enters the food chain, as it is an inorganic chemical which not used by animals, so it gets accumulated in the top most consumers leading to biological magnification. This can cause various harmful diseases, e.g. cancer.<\/li>\n<\/ul>\nAnswer 15.<\/p>\n
\nIn a chemical substance the elements are always present in definite proportion by mass.<\/li>\n Example – H2<\/sub>O \nMass ratio of H : O in water is always 2 : 16 or 1 : 8 \nWhatever may be the source of water 9 g of H2<\/sub>O when decomposed always give 1 g of hydrogen gas and 8 g of oxygen gas.<\/li>\nThe postulate is the relative number and kind of atoms present in a compound is always constant.<\/li>\n<\/ol>\nOR<\/strong><\/p>\n\nFlourine:<\/strong> Atomic number = 9; Electronic configuration = 2,7 and Valency =1<\/li>\nPotassium:<\/strong> Atomic number =19; Electronic configuration = 2, 8, 8, 1 and Valency = -1<\/li>\nSilicon:<\/strong> Atomic number = 14; Electronic configuration = 2, 8, 4 and Valency = 4<\/li>\n<\/ol>\nAnswer 16. \n\u2018Energy possessed by object by virtue of its position or configuration\u2019 – to be explained in candidate\u2019s own words. \nExample:<\/strong> Stretched string of bow\/ a stone lifted to a certain height (or any other appropriate example). \nS.I. unit \u2014 joule \nLet an static object of mass, m be raised to a height h above the ground.<\/p>\nThen, Force required to raise the object = Weight of the object \n= mg \nNow, Work done on the object, W = Force\u00a0\u00d7 displacement \n= mg\u00a0\u00d7 h \nThis work done is the stored potential energy of the object, \n\u2234 P.E. = mgh \nAs the object falls down, m = 20kg; g=10m\/s2<\/sup>; h = 10m \n\u2234 P.E. = mgh = 20 kg\u00a0\u00d7 10 m\/s2<\/sup> \u00d7 10 m \nP.E. = 2000 J \nIts P.E. gets converted to K.E. \nKinetic energy just before it touches = 2000 J<\/p>\nAnswer 17. \n1.<\/strong> \n \nProcess:<\/strong> Chromatography \nPrinciple:<\/strong> The coloured component that is more soluble in a solvent rises faster and in this ‘ way, the constituent colours of different dyes present in an ink gets separated.<\/p>\n\n\n\nChemical change<\/li>\n Chemical change<\/li>\n Physical change<\/li>\n Chemical change<\/li>\n<\/ol>\n<\/li>\n<\/ol>\nAnswer 18. \n1. Similarity:<\/strong> Liquid state is changed into gaseous state in both the processes.<\/p>\n\n\n\nEvaporation<\/strong><\/td>\nBolling<\/strong><\/td>\n<\/tr>\n\nIt is a surface phenomenon, i.e., water molecules at the surface gain energy to change their state.<\/td>\n It is a bulk phenomenon. All (bulk) the water molecules of water gain energy to change their state.<\/td>\n<\/tr>\n \nCan take place at all temperatures.<\/td>\n Take place at a fixed temperature.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n2.<\/strong> The transfer of solids directly into gaseous phase without attaining the liquid state is called sublimation. \nCamphor, naphthalene, dry ice. \n3.<\/strong> In solids, particles are closely packed with less intermolecular spaces but there are very strong forces of attraction. \nIn liquids the molecules are far from each other with kinetic energy that enables them to keep moving past each other, however they have less forces of attraction and more intermolecular spaces.<\/p>\nAnswer 19. \nVertebrata is divided into two superclasses, viz. Pisces and Tetrapoda. Animals belonging to Pisces subclass have streamlined body with fins and tails to assist in swimming. Animals belonging to Tetrapoda subclass have fore limbs for locomotion. \nTetrapoda subclass is further classified into the following classes:<\/p>\n
\nAmphibia:<\/strong> These are adapted to live in water and on land. They can breathe oxygen through skin, when under water and through lungs, when on land.<\/li>\nReptilia:<\/strong> These are crawling animals. Their skin is hard to withstand extreme temperatures.<\/li>\nAves:<\/strong> Their forelimbs are modified into wings to assist in flying. Beaks are present. Their body is covered with feathers.<\/li>\nMammalia:<\/strong> These have mammary glands present to nurture the young ones. Their skin is covered with hair. Most of the animals are viviparous.<\/li>\n<\/ul>\nAnswer 20. \n(a)<\/strong> 3 situations where work can be said to be done are:<\/p>\n\nIf a pebble lying on a surface is pushed, the pebble moves through a distance. In this situation work is said to be done as the applied force moves the body through some distance.<\/li>\n If a girl pulls a trolley and the trolley moves through a distance. In this situation work is said to be done.<\/li>\n When a book is lifted upto a certain height, a force is applied and the book rises up, therefore work is said to be done.<\/li>\n<\/ol>\n(b)<\/strong> w = 15 km\/h; v = 30 km\/h; Mass = 1000 kg; W = ? \n \nOR<\/strong><\/p>\n\nArchimedes\u2019 principle<\/strong> – When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it. \nIt is used in designing of ships and submarines.<\/li>\nFluids are the substances which can flow, e.g. gases and liquids are fluids. \nArchimedes\u2019 principle is based on the upward force exerted by the fluid on any object immersed in it. Hence it is applicable only for fluids. \nApplications of Archimedes\u2019 principle:<\/p>\n\nIt is used in designing of ship and submarines.<\/li>\n It is used in designing lactometer which is used to determine the purity of milk.<\/li>\n To make hydrometer that is used to determine the density of liquid.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\nAnswer 21. \n(a)<\/strong> Let two objects \u2018A\u2019 and \u2018B\u2019 of masses M and m, lie at a distance d from each other as shown in the figure. \n \nLet the force of attraction between the two objects be F. \nAccording to the universal law of gravitation, the force between two objects is directly proportional to the product of their masses. \nF\u00a0\u03b1 Mm …(i)<\/p>\nAlso force between the two objects is inversely proportional to the square of the distance between them, \n \nWhere G = Universal gravitational constant \n(b)<\/strong><\/p>\n\n\n\n‘g’<\/strong><\/td>\n\u2018G\u2019<\/strong><\/td>\n<\/tr>\n\n(i) It is defined as acceleration due to gravity.<\/td>\n It is defined as universal gravitational constant.<\/td>\n<\/tr>\n \n(ii) Value of g = 9.8<\/td>\n Value of G = 6.67\u00a0\u00d7 10-11<\/sup><\/td>\n<\/tr>\n\n(iii) Unit = m\/s2<\/sup><\/td>\nUnit = Nm2<\/sup>\/kg2<\/sup><\/td>\n<\/tr>\n\n(iv) It changes from place to place. At poles value of \u2018g\u2019 is more than at equator.<\/td>\n It remains constant throughout the universe.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nSECTION-B<\/strong><\/p>\nAnswer 22.<\/p>\n
\nA – Glass rod,<\/li>\n B – Beaker and<\/li>\n C – Solution<\/li>\n<\/ul>\nAnswer 23.<\/p>\n
\nA – Axon,<\/li>\n B – Dendrite<\/li>\n C – Cytoplasm\/ Cell body\/ Cyton.<\/li>\n<\/ul>\nAnswer 24.<\/p>\n
\nPlant root cells absorb water by osmosis.<\/li>\n The unicellular organisms like amoeba takes in the required material by osmosis.<\/li>\n<\/ul>\nAnswer 25. \n <\/p>\n
Answer 26. \nThe air bubble in the liquid taken in the measuring cylinder for an experiment will affect the volume of the solid because air bubble occupies some space in the liquid and this increases the volume of the liquid.<\/p>\n
Answer 27. \nSuppose the dimensions of a rectangular solid is 1, then \nV= 1\u00a0\u00d7 1\u00a0\u00d7 1 (l, b and h are taken as 1) \nV = 13<\/sup> \nIf it gets doubled, then Vn<\/sub> = 23<\/sup> \nVn<\/sub> = 8 times\u00a0\u00d7 V \nHence volume will increase by 8 times.<\/p>\nWe hope the CBSE Sample Papers for Class 9 Science Paper 6 help you. If you have any query regarding CBSE Sample Papers for Class 9 Science Paper 6, drop a comment below and we will get back to you at the earliest.<\/p>\n","protected":false},"excerpt":{"rendered":"
CBSE Sample Papers for Class 9 Science Paper 6 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 6. CBSE Sample Papers for Class 9 Science Paper 6 Board CBSE Class IX Subject Science Sample Paper Set Paper 6 Category CBSE Sample […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[6805],"tags":[],"yoast_head":"\n
CBSE Sample Papers for Class 9 Science Paper 6 - A Plus Topper<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n