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Question Bank, Science and Technology Part 1, Que 1: Choose the correct option in the multiple choice answer for the following, questions:-, , ( 1 mark each), , 1) A ……. Is necessary to change the speed as well as the direction of motion of an, object., a) force, , b) inertia, , c) momentum, , d) motion, , 2) The orbit of a planet revolving around a star is ……, a) circular, , b) linear, , c) towards the focal point d) elliptical, , 3)The square of its period of revolution around the sun is directly proportional to the, ……….. of the mean distance of a planet from the sun., a) square b) square root c) cube d) cube root, 4) The gravitational force between two bodies is directly proportional to the product of, the masses of those bodies and is ……….of the distance between them., a) inversely proportional to the square, b) directly proportional to the square, c) inversely proportional to the cube, d) inversely proportional to the square root, 5) The value of universal gravitational constant (G) in SI unit is…………, a) 6.673× 10, , -11, , c) 9.673 × 10, , 2, , Nm / kg, , -11, , 2, , 11, , b) 6.673× 10 Nm/ kg, , Nm/ kg, , d) 9.673 × 10, , -11, , 2, , Nm / kg, , 2, , 6) The ……………..force is much weaker than other forces in nature., a) gravitational b) electromagnetic c) nuclear force d) inter molecular, 7) The value of gravitational acceleration (g) is ……….., a) highest at the poles, b) highest at the equator, c) same everywhere on the surface of the earth, d) lowest at the poles, 8) The value of gravitational acceleration(g) is …………at the equator., a) 9.78 m/s, , 2, , 2, , b) 9.832 m/s c), , 9.8 m/s, , 2, , d) 6.67 m/s, , 2, , 9) The free fall of an object is possible only in……., a) air b) vacuum c) on the surface of earth d) None of these, 10) The weight of any object on the moon is nearly …………of the weight of the earth., a) 1/6, , b) 1/8, , c) 1/2, , d) 2/6, , 11) A person weighs 60N on earth. His weight on the moon will be……, a)360N, , b) 60N, , c) 6N, , d) 10N, , 12) Dobereiner laid down the…..rule.

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a) periodic b)modern periodic c) trictavesad d)octaves, 13)Newlands’ Law of Octaves is applicable upto….., a) oxygen b) calcium c) cobalt d) potassium, 14) X and Y are two elements having similar properties which obey Newlands’s Law of, Octaves.The minimum and maximum number of elements in between X and Y, respectively are……, a) 6 and 8 b) 7 and 15 c) 8 and 14 d) 6 and 13, 15)At the time of Mendeleev …..elements were known., a) 56 b) 65 c) 63 d) 118, 16)In Mendeleev’s periodic table eka- silicon was later named as…….., a) Scandium b) Gallium c) Germanium d) Thorium, 17)In Modern Periodic Table the number of columns and periods are respectively, …….and ……., a) 16,7, , b) 6,16, , c) 18,7 d)18,6, , 18)…….is the outermost shell for elements of period 2., a) K, , b) L, , c) M, , d) N, , 19)The groups 1 and 2 constitute the………block., a) s b) p, , c) d, , d) d, , 20)Which pair of atomic numbers represents elements in the same group ?, a) 11,19 b) 6,12 c) 4,16, , d) 8,17, , 21)which among the following elements would lose an electron easily ?, a) Mg b) Na, , c) Al d) Cl, , 22)Which among the following is the largest element?, a) Na, , b)Mg c) K, , d)Ca, , 23) Arrange the following elements in order of their decreasing metallic character., Na, Si, Cl, Mg, Al, a) Cl > Si > Al > Mg > Na, , b) Na > Mg > Al > Si > Cl, , c) Na > Al > Mg > Cl > Si, , d) Al > Na > Si > Ca > Mg, , 24)Which one of the following does not increase while moving down the group of the, Modern periodic table, a) Atomic radius, , b) Metallic character c) Valency d) Number of shells, , 25) On moving from left to right in a periodic table, the size of the atom……., a) increases b) decreases, c) decreases first and then increases d) does not change, 26)Which of the following statements about the Modern periodic table is correct ?, a) 18 horizontal rows are known as Periods., b) 7 vertical columns are known as Periods., c) 18 vertical columns are known as groups.

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d) 7 horizontal rows are known as Periods., 27) The d-block elements are called as………elements, a) Transition b) Metalloid c) Normal d) Iner transition, 28)The size of an atom is indicated by its…….., a) atomic number b) radius c) number of shells d) atomic mass, 29)……..is the distance between the nucleus of the atom and its outermost shell., a) Atomic radius b) Atomic diameter c) atomic mass d) atomic size, 30)Atomic radius is expressed in the unit ….., a) nanometer b) picometer c) micrometer d) millimeter, 31)The tendency of an element to form cation is the ………. character of that element., a) non metallic b) basic c) metallic, , d) acidic, , 32)………… is in liquid form in the halogen family., a) Fluorine b) Chlorine c) Bromine d) Iodine, 33)While going from top to bottom in a group the atomic radius………, a) increases b) decreases c) remains same d) No change occurs, 34) The tendency of an element to form anion is the ………. character of that element., a) non metallic b) basic c) metallic, , d) acidic, , 35)The elements from the zero group are called….., a) alkali metals b) alkaline earth metals c) halogen d) noble gases, 36)Writing a chemical reaction in brief by using chemical formulae is called as……., a) chemical change b) chemical symbol, c) chemical equation d) chemical reaction, 37)When the positive charge on an ion increases or the negative charge on them, decreases it is called as………….., a) reduction b) corrosion c) oxidation d) decomposition, 38)The chemical reaction in which two or more products are formed from a single, reactant is called …………..reaction., a) decomposition b) combination, c) displacement, , d) double displacement, , 39) In the chemical equation the ……………..are written on the left hand side ., a) products b) reactants c) element, , d) catalyst, , 40) Aqueous solution of ZnSO4 is added into the aqueous solution of BaCl2 , this is the, example of ……reaction., a) displacement, , b) double displacement c) redox d) reduction., , 41)The unit of electrical power is …., a) Volt b) Watt c) Joul d) Ampere, 42)The ‘live’ and the ‘neutral’ wires have potential difference of ……, a) 110 V b) 202V, , c) 201 V, , d) 220 V

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43) In an electric bulb coil of …………..metal is used., a) copper b) Tungsten c), , aluminium d) iron, , 44) The electricity bill specifies the usage in ……….., a) kilowatt, , b) Joule c) Volt, , d) Unit, , 45) The frequency of AC is ………….Hz, a) 20Hz, , b) 50Hz, , c) 25Hz, , d)75Hz, , 46) These days when current in the circuit suddenly increases……..switches are used., a) MCA, , b) MCC, , c) MCD, , d) MCB, , 47) A coil of an alloy……………..is used in electric heater cooker as a resistor., a) Stainless steel b) Nichrome, , c) Copper, , d) Bronze, , 48) The right hand thumb rule is also called …………….rule., a) Newton’s law of motion b) Newland’s law of Octave, c) Mendeleev’s periodic law d) Maxwell’s cork- screw, 49)…………….is used for electrical measurements., a) Thermometer, , b) Galvanometer, , c) Voltmeter d) Electric meter, , 50)Which of the following scientist invented the rule of electromagnetic induction?, a) Newton, , b) Kepler, , c) Mendeleev, , d) Michael Faraday, , 51) Which of the following substance contracts on heating?, a)Lukewarm water b) Ice, , c) Iron, , d) Mercury, , 52)If pressure increases the melting point of a substance ……….., a) does not change b) decreases, , c) increases, , d) remains constant, , 53) The vapor content in the air is measured by ………., a) relative humidity b) dew point c) absolute humidity, , d) none of these, , 54)Humid and dry nature of air depends on the………, a) amount of vapor in the air b) amount of vapor to make the air saturated, c) temperature of the air, , d) volume of the air, , 55) Vapors in air condenses to form…….., a) fog, , b) snowfall, , c) rainfall, , d) b and c, 0, , 56) When the temperature of water decreases below 4 C it’s volume….., a) decreases b) increases c) remains same d) none of these, 0, , 57) In a region with a cold climate the aquatic animals can survive at 4 C, because…….., a) Ice floating on water is insulator, b) the heat from water cannot transfer to the atmosphere, c) anomalous behaviour of water, d) all the above, 58) From the options given below the specific heat of…………is maximum., a) copper, , b) silver c) iron, , d) mercury, , 59) Ice-ball is prepared from shredded ice again.This is the example of ……

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a) melting b) condensation c) regelation d) freezing, 60) The SI unit of specific heat is ……………., a) Kcal, , b) Cal, , 0, , c) Cal/g c, , 0, , d) J/Kg c, , 61) ………………….apparatus is used to study the anomalous behaviour of water., a) calorimeter b)Joul’s apparatus, , c) Hope’s apparatus d) Thermos flask, 0, , 0, , 62) …………….heat is necessary to raise 1 Kg of water from 14.5 c to 15.5 C., a) 4180 Joul, , b)1 KJoul, , c) calorie, , d) 4180 calorie, , 63) due to …………………..pencil looks bent in water in the given experiment., , a) refraction of light, , b) dispersion of light, , c) internal reflection of light, , d) reflection of light, , 64)In the following diagram if ∠ i =40, then ∠ e =... ?, , a) 50, , b) 40, , c) 60, , d) 90, 0, , 65)A ray of light strikes the glass slab at an angle 40 with the surface of the slab. Then, the angle of incidence will be………., a) 50, , b) 40, , c) 60, , 0, , d) 90, , 66)We see the sun even after it goes below the horizon, because….., a) refraction of light, , b) dispersion of light, , c) partial reflection of light, , d) reflection of light, , 67)…………this is the unit of refractive index., a) cm, , b), , m, , c) degree, , d) refractive index has no unit, , 68) n =……………this law is also called as Snell’s law.

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a) 𝑠𝑖𝑛 𝑖, , b), , 𝑠𝑖𝑛𝑟, , c), , 𝑠𝑖𝑛 𝑟, 𝑠𝑖𝑛𝑒, , sin𝑠𝑖𝑛 𝑒, sin𝑠𝑖𝑛 𝑟, , d), , sin𝑠𝑖𝑛 𝑖, sin𝑠𝑖𝑛 𝑟, , 69)Lights of different colours are used ad signal for safety transport .From these the, wavelength of red light is………nm., a) 400, , b)500, , c) 600, , d) 700, , 70)If the refractive index of air with respect to glass is 2/3 .What is the refractive index, of glass with respect to air ?, a), , 2/3, , b), , 3/2, , c) 1/3, , d) ½, , 71) The process of separation of light into its component colours while passing through, a medium is called ………………., a) reflection of light, , b) refraction of light, , c) dispersion of light, , d) absorption of light, , 72)Light changes its direction when going from one transparent medium to another, transparent medium.This is called ………………, a) reflection of light, , b) refraction of light, , c) dispersion of light, , d) absorption of light, , 73)A ray of light gets refracted …………while entering the lens., a) once, , b)twice, , c) thrice d) doesn’t happen, , 74)The point inside the lens on the principal axis through which light rays pass without, changing their path is called ………………, , a) centre of curvature b) optical centre c) principal focus d) axiom point, 75) Virtual image is formed if an object is placed ………….., a)at infinity, , b) at 2F1 c) at focus F1, , d) between F1 and O, , 76) In the convex lens if an object is placed at 2F1, the image is formed at………, a) F1, , b)2F1, , c) beyond 2F1 d) On the same side of the lens as the object, , 77)All distances parallel to the principal axis are measured from the……, a) optical centre b) centre of curvature c) principal focus d) infinity, , 78)A small hole of changing diameter at the centre if Iris is called …….., a) optic nerves b) cornea c)optic disc d), , pupil, , 79)For a normal human eye the near point is at………, a) 2.1cm, , b)2.5cm, , c)25cm, , d)5cm, , 80)The image formed by ……. lens is always virtual and small., a) plane convex b) biconvex, , c) biconcave, , d) bifocal, , 81)In a relaxed state , the focal length of healthy eyes is …….., a) 2cm, , b) 2.5cm, , c) 25cmd) 5cm, , 82)For a specific glass lens f=0.5 .This is the only Information given to the student., Which type of lens is given to him and what is its power?, a) power 2D ; convex lens, b) power 1D ; concave lens, c) power -0.5; concave lens, d) power -0.25 D ; convex lens

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83) In Myopia the human eye…., a) cannot see nearby objects distinctly b)cannot see distant objects clearly, c) cannot see nearby as well as distant objects clearly, d) can see nearby as well as distant objects clearly, 84) Due to elongation of………….and increase in curvature of the eye lens, a person, cannot see distant objects clearly., a) eyeball b) pupil c) eyelid d) cornea, 85) In hypermetropia human eye ……….., a) can see distant objects clearly, , b) can see nearby objects distinctly, , c) cannot see nearby as well as distant objects clearly, d) cant see nearby as well as distant objects clearly, 86) Bifocal lens is required to correct ……………defect., a) myopia b) hypermetropia, , c), , presbyopia, , d) none of these, , 87} ……. times larger images can be obtained by using a simple microscope., a) 5 b) 10, , c) 20, , d) 60, , 88) ………… is a combination of two convex lenses with small focal length., a)simple microscope, , b) compound microscope, , c) telescope, , d) none of these, , 89) Bronze is an alloy of……., a) copper and tin b) copper and zinc c) copper and iron d) iron and nickel, 90)……………..is an alloy made from iron, nickel and chromium., a) brass b) bronze c) stainless steel, , d) amalgam, , 91) …………….is basic oxide ., a) CO2, , b), , K2O, , c) SO2, , d) Al2O3, , 92)In electrolytic reduction of alumina ……………is used as a cathode., a) sulphur, , b) graphite, , c), , platinum d) aluminium, , 93) Iron is……., a) more reactive than zinc b) more reactive than aluminium, c) less reactive than copper d) less reactive than aluminium, 94)If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity, Then the correct order would be which of the following?, a) Cu, Fe, Zn, Al, , b) Al, Cu, Fe, Zn, , c) Zn, Al, Cu, Fe, , d) Fe, Zn, Al, Cu, , 95) Which of the following method is used to prevent the accumulation of greenish, layer on brass due to corrosion, a) electroplating, , b) anodization, , c), , tinning, , d) alloying, , 96)In Wilfley table method to separate particles of gangue ……….method is used., a) Magnetic b) Froth floatation, 97)Aluminium oxide is ……….oxide ., , c) Leaching, , d) gravitation

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a) acidic, , b ) basic c) neutral, , d) amphoteric, , 98)Atomic number of aluminium is … and its electronic configuration is……………, a) 13, ( 2, 8, 3), , b) 12 ( 2, 8, 2), , c) 13, (3, 10), , d) 12, (2, 10), , 99) The chemical formula of zinc blend is….., a) ZnSO4, , b) ZnS, , c) ZnCO3, , d) ZnO, , 100)Extraction of moderately reactive elements is done by …… and …….. method., a)roasting and calcination, , b) roasting and reduction, , c) separation and calcination, , d)none of these, , 101)Corrosion of silver causes a black layer of …………, a)Silver nitrate b) silver oxide c) silver sulphide d) silver carbonate, 102)To prevent corrosion of iron and steel ……. method is used ., a) electroplating, , b) anodization, , c), , tinning, , d) galvanizing, , 103) In preparation of Aqua regia hydrochloric acid and………….acid are mixed., a) sulphuric acid b) nitric acid c) carbonic acid d) phosphoric acid, 104)The sound of one metal colliding with another makes a noise, this property is called, as ……, a) good conductors b) ductility, , c) sonority d) malleability, , 105) ………… exist in a liquid state at room temperature., a) Chlorine b) Bromine c) Iodine, , d) Fluorine, , 106)Ionic compounds are electrically ………….., a) positively charged, , b) negatively charged c) neutral, , d) conductor, , 107) ………..is good conductor of heat but bad conductor of electricity., a) graphite, , b) diamond c)coal d) iodine, , 108)………is the least reactive metal., a) silver b) sodium c) zinc d) gold, 109)………. forms a green colour in the water., a) CuSO4, , b) FeSO4 c) NaCl, , d) all the above, , 110)Tin is an alloy of ………., a) copper b) tin c) zinc, , d) silver, , 111) When one of the metals in an alloy is mercury the alloy is called……….., a) amalgam b) sodium amalgam c) zinc amalgam d) all the above, 112) The minerals from which the metal can be separated economically are called ………, a) minerals b) ores c) gangue d) alloy, 113)Generally the melting and boiling point of carbon compounds are found to be less, 0, , than …….. c, a) 300 b) 100, , c) 200, , d)150, , 114) Number of valence electrons in a carbon atom is……., a) 4, , b) 5, , c) 1, , d) 3

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115)The bond between two oxygen atoms is …………bond ., a) double b) triple, , c) single d) none of these, , 116)The molecule mass of a carbon compound is spread over a range of ….., a)10, , 12, , b) 10, , 14, , c) 10, , 10, , d) 10, , 13, , 117)The unsaturated hydrocarbons containing a carbon- carbon double bond are, called…., a) Alkenes, , b) Alkanes, , c) Alkynes, , d) Alcohol, , 118) The unsaturated hydrocarbons whose structures contain a carbon -carbon triple, bond are called …….., a) Alkenes, , b) Alkanes, , c) Alkynes, , d) Alcohol, , 119)The phenomenon in which compounds having different structural formulae have, the same molecular formula is called …………, a) structural isomerism b) catenation, , c)homologous d) functional group, , 120) From the following hydrocarbon ………………is the cyclic hydrocarbon., a) isobutane b) propyne c) benzene d) isobutylene, 121) While going in an increasing order of the length there is a rise in the molecular, mass of the members by……., a) 14 u, , b) 15u, , c) 16 u, , d) 17u, , 122) The general molecular formula for the homologous series of alkynes is ………., a) CnH2n, , b)CnH2n + 2, , c) CnH2n - 2 d) CnH2n – 1, , 123) …….is one of the combustible components of L.P.G., a) Methane b) Ethane c) Propane, , d) Butane, , 124)At room temperature ethanol is ……, a)solid, , b) gas c) plasma, , d) liquid, , 125)Generally ……is called spirit., a) methanol, , b) ethanol c) propanol d) butanol, , 126)Due to……….. we can gather information about worldwide events sitting at home., a) worldwide web b) internet, , c) artificial satellite d) natural satellite, , 127) The first person to step on the moon is …….., a) Neil Armstrong b) Rakesh Sharma c) Kalpana Chawla d) Sunita Williams, 128)The first artificial satellite ……was sent to space by Soviet Union in 1957., a) Apollo, , b) Chandrayaan c) Sputnik, , d) Luna 2, , 129)If a spacecraft is to be sent to travel to outer space.it must have minimum velocity, of ………, a) 11.2 km/s, , b)11.6km/s, , c)13.2km/s, , d)1.4m/s, , 130) A group of students from COEP Pune sent a small satellite …….. through ISRO in, 2016., a) Luna 6 b) Apollo 6, , c) Swayam d) Param

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131)The astronomical object closest to us is the ………, a) Moon b) Mars c) Saturn, , d) Mercury, , Que. 1 B) I. Find the correlation, 1. Eka boron : Scandium :: Eka Aluminum : ........, , 2. Mendeleev's periodic table : atomic mass :: Modern periodic table :........, , 3., , Group 1 and 2 : S block :: group 13 and 18 : ....., , 4. Group 13 and 18 : P block :: ......... D block, 5. Two elements in the same position : demerit of Newland's octaves :: place for, Isotopes :......., , 6. Beryllium : alkaline earth metal :: sodium: ......, 7. Cl : halogen group :: Ar : ......, , 8. Iodine : solid :: bromine : ......., 9. Electric motor : converts electrical energy into mechanical energy :: electric, generator: .................., , 10. Fleming's left hand rule : electric current :: Fleming's right hand rule :.............., 11. Alternating current : oscillatory :: Direct current:.........., , 12. When ice is converted into water : constant temperature :: before the water, evaporates : ..................., 13. Relative humidity greater than 60% : saturated air :: relative humidity less than, 60% :: ......................, , 14. While studying anomalous behavior of water in Hope's apparatus, the upper, temperature of the thermometer : 0°C :: lower temperature of the thermometer :, ::.................., 15. The density of water is high at 4°C : anomalous behavior of water :: shredded ice, converted into solid ice balls : .................., , 16. Specific latent heat of vaporisation : J/Kg :: specific heat : ..................., 17. 2 n 1 : Refractive index of medium 1 with respect to medium 2 :: 1 n 2:, ............................, , 18. Refractive index of air : 1.0003 :: refractive index of water : .........................., 19., , 20., , Convex, , lens, , :, , converging, , Nearsightedness:, , elongated, , ::, , eyeball, , concave, ::, , 21. Object at 2F1 of a convex lens : Image at 2F2, 22., , Nearsightedness, , 23. Simple microscope :, :---------, , :, , concave, , lense, , ::, , lens, , :----------, , farsightedness:----------::, , Object at F1 :-------, , farsightedness, , :----------, , Number of convex lens one :: compound microscope, , 24. Focal length : metre :: power of lens :---------, , 25., , : Concave lens ::, , :----

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26., , : Object near the lens:: :----, , 27. Brass : Aluminium and zinc : : Bronze : ---------------28. Pressure cooker : Anodizing : : Silver plated spoons : --------------, , 29. In Electrolytic reduction of alumina, Anode : ------- : : Cathode : Graphite lining, 30. Sulphide ores : Roasting : : Oxide ores : ---------------31. Bauxite : Aluminium ore : : Cassiterite : -----------, , 32. Metal sheets : Malleable : : Electric wires : -----------33. Zinc sulphide : Roasting : : zinc carbonate : -------------, , 34. Rusting of iron : Fe2O3 : : corrosion of copper : -----------, , 35. Diamond : electric insulator : :---------- : electric conductor., 36. Soft metal : Na : : hard metal :------, , 37. Aluminium:-----------: gold : : electric insulator, 38. Bronze :--------:: Tin : Cu+Zn., , 39. Solid : iodine ::---------: bromine, , 40. CH3-CH2-CHO : propane :: CH3- COOH : ............., 41. Kotone : -CO- :: Ester : ..............., , 42. Cyclohexane : Cyclic hydrocarbon :: Isobutylene : ............., 43. Saturated hydrocarbon : Single bond :: Unsaturated hydrocarbon : ................., , 44. Saturated carbon compounds : blue flame :: Unsaturated carbon compounds :, ……………., , Que 1 B) II. Find odd one out and give its explanation, 1. F , K , Cl , I, , 2. Lithium, Sodium, Magnesium, Potassium, 3. Beryllium, Helium, Neon, Argon, , 4. Gallium, Scandium, Germanium, Calcium, 5. Boron, Arsenic, Germanium, Gallium, , 6. Dobereiner, Newland, Mendeleev, Moseley, 7. Fluorine, Boron, Bromine, Chlorine, 8. Carbon, Calcium, Oxygen, Neon, , 9. Potassium, Magnesium, Calcium, Beryllium, 10. Beryllium, Magnesium, Carbon, Oxygen, , 11. Voltmeter, Ammeter, Galvanometer, Electric motor, 12. Loud speaker, Magnet, Microphone, Electric motor, , 13. Fuse wire, bad conductor, Rubber gloves, Generator, 14. Tungsten, Nichrome, Aluminium, Iron, , 15. Boiler, Electric stove, Electric bulb, Electric bell, , 16. Temperature, Conduction, Convection, Radiation

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17. cal/g, cal/g°C, Kcal/Kg°C, erg/g°C, 18. Joule, erg, Calorie, Newton, , 19. Rainbow, Earthquake, Sunset, Sunrise, 20. Focal length, Radius of curvature, Image distance, Size of Image, 21. Simple Microscope, Compound microscope, Telescope, Prism, 22. Eye lense, Retina, Cerebellum, cornea, , 23. Object distance, Image distance, focal length, principal axis, 24. Eye piece, Magnifier, Kaleidoscope, Telescope, 25. Sodium, Potassium, Silver, Sulphur, 26. Boron, Chlorine, Bromine, Fluorine, 27. Copper, Iron, Mercury, Brass, , 28. Brass, Bronze, Phosphorous, Steel, , 29. Tinning, Alloying, Anodization, Froth floatation, 30. Zinc coating, Tinning, Electroplating, Calcination, 31. Na, K, Cu, Li, , 32. Ethylene, Styrene, Propylene, Teflon, 33. Butane, Methane, Benzene, Ozone, 34. CH4, C2H6, C5H12, CaCO3, 35. C2H2, C3H8, C2H6, CH4, , 36. C2H4, C4H10, C3H8, CH4, , 37. Sputnik, Moon, Swayam, Chandrayaan, Que 1 B ) III. Answer the following questions in one sentence., , 1., , 2., 3., , 4., , Element A and B follows the Newland’s octaves rule. How many elements are there, in between A and B ?, , Write the characteristic of Dobereiner’s triads?, , To which element does Newland’s octave rule apply?, , Write the molecular formula of the oxide of any one of the elements in Mendeleev’s, periodic table., , 5., , Write the name of noble gas having 2 electrons in its valence shell., , 7., , Which two elements show an ambiguity regarding their sequence in Mendeleev’s, , 6., , 8., 9., , Write the name of an element having electronic configuration 2,8,2., periodic table?, , The elements beryllium, magnesium and calcium are in group 2. What will be their, valency?, , The modern periodic table is divided into which blocks?, , 10. What determines the chemical reactivity of elements?, 11. Write chemical formula for rust., , 12. Complete the given chemical reaction., 13., , CuSO4 (aq)+ Fe(s) → ..... + ......, , What is the heating effect of electric current?

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14., , Which metal used to make the filament of an electric bulb?, , 15., , What is a short circuit?, , 17., , How much Volts potential difference between live and neutral wires?, , 16., 18., 19., , 20., , What is the potential difference, What is used to turn off the sudden increase in current in the electrical circuit of, , the house nowadays?, , Write two devices based on the heating effect of electric current., Write Fleming’s right hand thumb rule., , 21., , Write Fleming’s left hand rule., , 23., , What is a solenoid?, , 22., 24., , Write Fleming’s right hand rule., Write the two names in the following diagram., , A) Right hand thumb rule., , B) Fleming’s right hand rule., , 25., , Define boiling point of a liquid., , 27., , How fog is formed?, , 28., , What is a dew point temperature?, , 26., , What is meant by regelation?

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29., 30., , What does the existence of drops of water on the leaves of a tree in the morning, , indicate?, , Which temperature segment is chosen when determining the unit of heat?, , Why?, 31., A., , Identify the wrong figure from the following., B., , 32. Write the molecular formula of the given compound., 1. Ethyl ethanoate 2. Sodium ethanoate, , 3. Sodium ethoxide, , 4. Stearic acid, , 6. Palmitic acid, , 5. Oleic acid, , 33. Write the molecular formula of the given compound., 1. Ethylene, , 2. Benzene, , 3. Acetic acid, , 9. Ethanol, , 10. Ethanoic acid, , 11. Isobutane, , 5. Acetylene, , 6. Ethyl alcohol, , 7. Acetone, , 4. Propylene, 8. Propene, , 34. Draw electron dot structure and line structure for given molecules., 1. Hydrogen 2. Oxygen, , 3. Methane 4. Nitrogen 5. Ethene, , Que 1 B) IV. Match the columns., 1., , Column A, , Column B, , 1) Eka-aluminium, , a) Scandium, , 3) Eka- boron, , c) Germanium, , 2) Eka-Silicon, , b) Gallium, , d) Beryllium, 2., , Column A, , Column B, , 2) Octave, , b) Dobereiner, , 4) Atomic mass number, , d) Moseley, , 1) Triads, , 3) Atomic number, , 3., Column A, , a) Mendeleev, c) Thomson, e) Newland, Column B

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1) s -block, , a) Lanthanides and actinides, , 3) d-block, , c) Group 1, 2, , 2) p-block, 4) f-block, 4., , Column A, , Electronic configuration, , b) Group 3 to 18, , d) Group 13 to 18, e) Zero group, , Column B, , Valency, , 1) 2 , 2, , a) 1, , 3) 2 , 5, , c) 3, , 2) 2 , 8, 1, d), 5., , 5, , b), , 2, , Column A, , Column B, , 2) Alkali metals, , b) Group 17, , 1) Alkaline earth metals, 3) Halogen, , 4) Noble gas, , a) Group 18, c) Group 2, d) Group 1, , e) Group 14, , 6., Column A, , Column B, , 1) Direct current, , a) Oscillatory, , 2) Alternating current, , b) Non oscillatory, , 7., Column A, , Column B, , 1) Specific latent heat of fusion, , a) Air saturated with vapour, , 3) Dew point temperature, , c) liquid converts into gas, , 2) Specific latent heat of vaporisation, , b) Solid converts into liquid, , 8., Column A, , Column B, , 1) Absolute humidity, , a) J/cal, , 2) Latent heat, , b) J/Kg° C, , 4) Heat, , d) no unit, , 3) Specific heat capacity, , c) KJ/Kg, , e) Kg/m3, 9., , Column A, , Column B, , 1) Dry air, , a) 4°C

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2) Humid air, , b) Relative humidity 100%, , 3) Saturated air/Dew point temperature, , c) Relative humidity below 60%, , 4) Maximum density of water, , d) Relative humidity above 60%, e) -4°C, , 10., Substance, , Property, , 1) KBr, , a) Combustible, , 2) Neon, , b) Soluble in water, , 3) Gold, , c) No chemical reaction, , 4) Sulphur, , d) High ductility, , 11., Group A, , Group B, , 1.Bauxite, , a) Mercury, , 2.Cassiterite, , b) Aluminium, , 3.Cinnabar, , c) Tin, , 12., Group A, , Group B, , 1. ZnS, , a) Copper Sulphide, , 2. HgS, , b) Bauxite, c) Cinnabar, d) Zinc blend, , 13., Group A, , Group B, , 1) Copper and Zinc, , a), , Brass, , 2) Copper and Tin, , b), , Steel, , c), , Stainless steel

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14., Group A, , Group B, , 1) Electroplating, , a) Pressure cooker, , 2) Anodising, , b) Silver plated spoons, c) Coating of tin on copper, d) Coating of Zinc on iron, , 15., Group A, , Group B, , 1., , a) Sonority, , Making sheets of metals, , 2. Making metal utensils, , b) Malleability, , 3. Making Copper wires, , c) Good conductor of heat, , 4. Making bells from metal, , d) Ductility, , 16., Group A, , Group B, , 1) C2H6, , a) Unsaturated hydrocarbons, , 2) C2H2, , b) Molecular formula of one alcohol, , 3) CH4O, , c) Saturated hydrocarbons, , 4) C3H6, , d) Triple bond, , 17., Group A, , Group B, , 1 Straight chain hydrocarbon, , a) Benzene, , 2 Branched chain hydrocarbon, , b) Propyne, , 3 Cyclic hydrocarbon, , c) Isobutylene

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18., Group A, , Group B, , 1) Ether, , a) –OH, , 2) Kitone, , b) -O-, , 3) Ester, , c) -CO-, , 4) Alcohol, , d) -COO-, , Que 1 B) V. Complete the incomplete sentence., , 1. According to Newland’s octave rule, chlorine shows similarity with fluorine. Because,, chlorine is ……………, 2. According to Mendeleev’s periodic law properties of elements are…………, , 3. The number of electrons in the outermost shell of an atom determines the ……….., 4. Electropositivity means ………….., , 5. According to Dobereiner’s triads rule, three elements in an increasing order of, atomic mass shows…………, Que.1B) VI. Write the name:, 1. The atom having the biggest atomic size from period 2, , 2. The atom having the smallest atomic radius from zero group., 3. The family of group 1 elements, 4. Highest reactive non metal, , 5. The element having stable electron configuration from the third period., 6. A halogen from period 4, , 7. The family of elements having zero valency, 8. Two elements having two orbits, 9. Highest electronegative element, , 10. Highest electropositive element, 11. The atom having smallest atomic radius from group 1, , 12. The group of elements having electronic configuration 2, 2, 13. Product obtained when sugar is heated., 14. The phase in which solid substances are converted into liquid-, , 15. The amount of heat absorbed at constant temperature by unit mass of a liquid to, convert into gaseous phase-, , 16. Conversion of ice into liquid due to applied pressure and the reconverts to ice once, the pressure is removed17. The instrument used to study anomalous behavior of water-

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18. The instrument used to measure the specific heat capacity of a substance using, mixture method-, , 19. The distance between focus and optical centre20. The part of human eye that transmits electrical signals to the brain21. The lens used in simple microscope-, , 22. The ability of lens to adjust the focal length as per need is –, 23. The defect of eye occurring due to ageing –, 24. The fleshy screen behind cornea –, , 25. The screen with light sensitive cells in human eye –, , 26. The sensation on the retina persists for a while is –, 27. The persons which are unable to distinguish between different colours 28. The imaginary line passing through two optical centers of lens 29. The molecular formula of main ore of aluminium –, 30. The ore is produced by using -, , 31. Non metals which are good conductors –, 32. The reagent which dissolves noble metals, 33. Metals which are amphoteric in nature –, 34. An alloy of copper and zinc –, 35. Two highly reactive metals –, , 36. Strongly heating carbonate ores in insufficient air –, 37. Extraction of aluminium from alumina38. Method used to present corrosion of copper –, Question 1 . B) Right or wrong sentence., 1., , If the distance between two masses is doubled, the gravitational force between, them becomes less than the previous force., 2, , 2, , 2., , The CGS unit of G is dyne.cm /g ., , 4., , The value of g is highest at the equator., , 3., , The value of gravitational acceleration with the center of the earth is zero., , 5., , The value of G varies from place to place., , 6., , As it rises above the earth's surface, its value increases., , 7., , The speed of release of an object does not depend on the mass of the object., , 9., , The similarity between the properties of the first and eighth elements is called the, , 8., , Mass is a qualitative measure of the inertia of an object., octave rule., , 10. In Dobreiner's triangles, three elements appear to be arranged in ascending order of, 11., 12., , their atoms., , While designing the periodic table, Mendeleev considered the chemical and physical, properties of the elements., , The modern periodic table has 1 to 7 cycles.

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13., 14., , The modern periodic table shows the molecular values ​of the elements in each, frame., , P-segment is composed of groups 1 and 2., , 15., , To the left of the serpentine line in the periodic table are the metal elements., , 17., , Nanometers use these units to measure atoms., , 18., , Moving from left to right, the size of the atom decreases., , 16., , 19., , 20., , The compound of the elements in group 2 is 1., , All the elements in the halogen family are gases., , The elements lithium and beryllium are in the same cycle because their, , compounds are similar., , 21., , Beryllium and calcium are alkaline soil metals., , 22., , The K and L shells of the elements Na and Mg contain electrons., , 23., , 24., , The number of shields decreases as the calculation goes down from top to, , bottom., , The metal properties of the element decrease as the spiral moves from left to, , right., 25., , The size of an atom depends on the number of compound electrons., , 27., , The properties of the metal increase as it goes down in the calculation., , 29., , If edible oil is kept well for a long time, it will get sour., , 26. Silicon is a metallic element., 28., , Electrical negativity is the metallic property of an element., , 30. The alternating current is a vibrating current., 31., , 32., , Electrical wires and neutral wires have a 220 V potential difference., Increasing the current passing through the wire decreases the magnetic field, , intensity., , 33., , Use galvanometers for electrical measurements., , 34., , The frequency of the alternating current is 50Hz., , 36., , The dew point temperature does not depend on the amount of vapor in the air., , 35., 37., , Electrochemicals are devices that convert electrical energy into mechanical energy., 0, , The specific heat capacity of water is 1 cal / g C., , 38. The invisible heat of evaporation is called the conversion of gas into liquid., 39. Use calorimeters to study the inconsistent behavior of water., , 40. During reheating, ice is converted to water at a temperature of 0°C., 41., , 1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water, , vapor., , 42. Calorimeters are used to measure specific calorific value., 43. All metals have the same specific heat capacity., , 44. Humidity relative to dew point temperature is 100%., 3, , 45. The unit of absolute humidity is Kg / m ., 46. 1 calorie is 4.81 joules, , 47. The incident rays and refracting rays are on opposite sides of the column.

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48., , Purple has the lowest refractive index., , 49., , The speed of light varies in different media., , 50., 51., 52., 53., 54., , Convex magnifying glass is called divergent magnifying glass and concave, , magnifying glass is called converging magnifying glass., , The image of the object in the human eye is formed on the cross screen., This defect of vision can be remedied by using endoscopic magnifying glass with, , proper focal length., , If the incident ray is parallel to the main axis, then the refracted ray passes, , through the main navel., , The image of an object at an infinite distance is obtained in a real and smooth form, , through a convex magnifying glass., 55., , The power of the magnifying glass depends on the distance of the magnifying, , glass., , 56. The lens of the eye is flattened when looking at nearby objects., 57., , For a healthy human eye the distant point is infinite distance., , 58., , Vision defects increase the distance between the lens of the eye and the retina of, , 59., , the eye. There are defects in myopia., , The virtual shape of the object seen by the eye depends on the angle held by the, , object with the eye., , 60. Electrolysis is used to obtain pure metal from impure metal., 61., , Ionic compounds are soluble in kerosene., , 62. Stable ionic compounds conduct electricity., 63., , Mercury, silver, gold are highly reactive metals., , 64., , In the electrolytic method, a layer of highly active metal is applied to a less active, , 65., 66., 67., , metal., , In the electrolytic dissipation method of alumina, the lining of graphite acts as an, anode., , The electrolysis of alumina combines fluospar and cryolite to increase the, , solubility in the precipitation method., Cassiteite is a copper metal., , 68. Diamond is a hard substance., 69., , Gold and silver are active metals., , 71., , Baux reacts with sodium hydroxide in the Bayer process., , 70., 72., , Halogen reacts with acid., , The number of electrons in the compound shell of a carbon atom is 4., , 73. Your body is made up of carbon., 74. Carbon compounds contain only free chains of carbon atoms., 75., , Two carbon atoms can always form one or two covalent bonds., , 76., , In general, saturated compounds are more reactive than unsaturated compounds., , 78., , Cyclohexane is a branched chain type of hydrocarbon., , 77., , Benzene is a coated unsaturated hydrocarbon.

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79., , As one ascends in any homogeneous category, physical properties change in one, direction., , 80. There are different common molecules for all members of the homologous range., 81., , LPG Butane is a flammable element in., , 83., , Potassium permanganate is an oxidizing compound in regular use., , 84., , Colorless ethanol is in liquid state at room temperature., , 82., , 85., , Substances that can give oxygen to other substances are called particulate matter., , Ethanol is all soluble in water., , 86. Easter is a sweet-smelling dish., 87., , The speed of liberation on the moon is less than the speed of liberation on earth., , 88., , India is the first country to discover the existence of water on the moon., , 89., , The function of a satellite launcher is based on Newton's second law of motion., , Question 1 (B) VIII. Write an explanation., 1., , Group, , 2. Period, 3. Atomic radius, , 4. Electropositivity, 5. Electronegativity, , 6. Balanced equations, 7. Endothermic reaction, 8. Critical angle, , 9. Center of curvature of the lens, 10. The optical center of the lens, 11. Principal focus, 12. Focal length, 13. Principal axis, , 14. Minimum Distance of distinct vision, 15. Farthest Distance of distinct vision, 16. Magnification, , 17. Power of accommodation, 18. Persistence of vision, 19. Alkane, 20., , Alkene, , 21. Alkyne, , Q1B IX. Identify who I am!, , 1. Carbon aberrations -------------2. Mutual oxide forming metal --------3. Ores of Aluminum ------------, , 4. Metal in Liquid state -------------------

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Question 2 (A) Write Scientific reasons. (2 marks each), , 1., , The value of acceleration g is greater at the pole than at the equator., , 2., , The value of gravitational acceleration (g) decreases as we go above the Earth's, , 3., , The value of gravitational acceleration (g) decreases as we go deep inside the earth., , 4., , When we drop a feather and a stone at the same time from a height the stone, , 5., , The weight of an object varies on different planets., , 6., , surface., , reach the earth faster than a feather., , The value of gravitational acceleration (g) is taken to be -g when studying the, motion of an object thrown upwards in a straight line., , 7., , The value of g at the center of the earth is zero., , 9., , There was ambiguity about the correct position of hydrogen in Mendeleev's, , 8., , Mendeleev kept vacant places in the periodic table., , periodic table., , 10. Boron and oxygen elements are placed in the second period in periodic table ., 11., , 12., , There was no definitive place for isotope in Mendeleev's periodic table., Lithium and sodium are included in the same group in periodic table., , 13. In same periods boron and oxygen elements have different atomic size., , 14. The metallic character of elements increases while going down the groups., 15., , The non-metallic character increasing while going from left to right in a period., , 16. In a group , the size of the atom increases as it goes down from the top., 17., , In group 2, beryllium and calcium elements, calcium is the most electropositive, element than beryllium., , 18. Elements belonging to the same group have the same valency ., 19. Always Paints door and windows before using their nets., 20. It is recommended to use air tight container for storing oil for long time., 21., , 22., , When the gas formed heating the limestone is passed through the freshly, , prepared lime water, the lime water turns milky., , It takes time for pieces of Shahabadi tile to disappear in HCl but it's powder, , disappears rapidly., 23., , In practice the unit of kWh is used for the measurement of electrical energy,, , rather than Joule., , 24. Tungsten metal is used to make a solenoid type coil in an electric bulbs., 25., , For electric power transmission , Copper or aluminum wires is used., , 26. Nowadays MCBs are used in homes, for stop the current in the circuit which, suddenly increases ., , 27. A coil made up of alloy Nichrome is used in the electric heater-cooker as a resistor., 28., , It is beneficial to carry electrical energy in reverse form as it is carried over long, , distances., , 29. In cold regions, in winter the pipes for water supply breaks .

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30. Even if boiling water is constantly heated, its temperature does not rise., 31. Use a pressure cooker to cook food in cold air., 32., , In the cold regions, snow falls in winter., , 33., , The bottom of some steel utensils used for cooking is copper., , 34., , Drops of water can be seen accumulating on the glass of vehicles in the early, , hours of winter., 35. During winter season, we may have observed a white trail at the back of flying high, in the clear sky or sometimes it may not get formed., , 36. Fish can survive even in frozen ponds in cold regions., 37., , Placing a plastic bottle filled with water in the freezing compartment in the freezer, , can cause the bottle to explode., 38. Even the wire moves through the ice slab , the ice slab does not break., 39., , The sun appears on the western horizon for some time after sunset., , 40. It looks like a sack that encloses with a drawstring., 41., , The stars twinkle but we don't see twinkling of planets ., , 42., , The coin in the disappeare to have been seen from a specific location. But as soon, as the water is poured into the pot to a certain level, the coin appears., , 43. A pencil appears to be broken near the surface of water ., 44. A convex lens is called a converging lens., , 45. Nearsightedness, this defect can be corrected by using spectacles with concave, lens., 46. Farsightedness, this defect can be corrected by using convex lens., 47. Adults need bifocal lens spectacle., , 48. Presbyopia effect is more common in people over 40 years of age., 49. Simple microscope is used for watch repairs., 50. One can sense colours only in bright light., 51. The movie cannot be enjoyed if it is too close to the screen in the cinema., , 52. We can not clearly see an object kept at a distance less than 25 cm from the eye., 53. Sodium is always kept in kerosene., 54. Pine oil is use in froth formation., , 55. Lemon or tamarind is use for cleaning copper vessels turned greenish., 56. Anodes need to be replaced from time to time during the electrolysis of alumina., 57. Generally the ionic compounds have high melting points., 58., , Adding zinc particles to a solution of copper sulphate makes the blue solution, , colorless., , 59. Anodization method is useful for prevention of the corrosion of the aluminium., 60. On exposure to air , silver articles turn blackish after some time., , 61. Magnetic separation method is used to separate the magnetic ingredients in the, ores., , 62. Coins are made from metals and alloys.

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63. Meena's mother uses lemon or tamarind for cleaning, , copper vessels turned, , greenish., , 64. In the laboratory, sodium is immersed in kerosene., 65. Ethylene is an unsaturated hydrocarbon., , 66. The flame appears yellow in the ignition of naphthalene., 67., , The color of iodine disappears in the reaction between vegetable oil and tincture, iodine., , 68. Vegetable ghee is formed from the hydrogenation of vegetable oil in presence of, nickel catalyst., , 69. Carbon has the property of forming many compounds., 70., , Benzene compounds are called aromatic compounds., , 71., , The velocity at the earth's surface must be greater than the escape velocity of the, , earth., , 72. Space debris can be harmful to the artificial satellites., 73., , Satellite launch vehicles are used to place satellites in their specific orbits., , 74. The Launch vehicles are very costly., Q.2 (B) Solve the following Questions.( Each 2 Marks), 1)Complete the following chart regarding the weight and mass of an object., Object, , On Earth, , On moon, , Mass, , X, , ....., , Weight, , ....., , Y, , 2)State Newton’s Universal Law of Gravitation., 3)Define acceleration due to gravity.Write its value on the surface of Earth., , 4)If a person weighs 750N on Earth, what will be the weight of the person on moon?(, The mass of moon is, , 1, 81, , times the mass earth and its radius is, , 1, 3.7, , times that of, , earth.), 5)Mahendra and Virat are sitting at a distance of 1m from each other.Their masses are, 75Kg and 80Kg respectively.What is the gravitational force between them?, , (G = 6.67 x 10, , -11, , 2, , 2, , Nm /kg ), , 6)Identify the mistake in the given diagram and draw it again.

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7)The mass of planet ‘X” is four times that of the earth and its radius is double the, 3, , radius of the earth. The escape velocity of a body from the earth is 11.2 × 10 m/s., Find the escape velocity of a body from the planet ‘X’., , 8)State the following., , a)Doberenier’s law of Traids, b)Newlad’s Law of Octaves, , c)Mendeleev’s Periodic Law, d)Modern Periodic Law, , 9)Complete the following flow chart., , 10) In the modern periodic table, the positions of 1 to 20 elements are shown here., Identify the elements A and B. Write their atomic number.

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11)some elements and their atomic radii are given here. Arrange them in a decreasing, , order of their atomic radii. Identify which of the above elements is the biggest, atom and which is smallest?, , Element, , K, , Na, , Rb, , Cs, , Li, , Atomic, , 231, , 186, , 244, , 262, , 151, , radius(, pm), , 12) Complete the following chart., Shell, , n, , 2n, , 2, , Electron, , holding, , capacity, K, , ___, , L, , 2, , ____, , 3, , N, , 4, , 2×1, , 2, , 2, , 8, 2×3, , 2, , 2×4, , 2, , 18, , _____, , 13)Find the period in which these elements can be placed., 14)Electronic configuration of element A is 2,8,1. Answer the following questions based, on this information., , a)What is the atomic number of element A?

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b)Find the group to which this element belongs., 15)Classify the following elements into Metals and Nonmetals., S,Mg,Al,P,N,Na., , 16)Explain the factors affecting the rate of chemical reaction with example., 17)What are reactants and products?Explain with the help of examples., , 18)Explain the following reaction with their balanced chemical equation ., a)Ammonia gas reacts with hydrogen chloride., , b)hydrogen sulphide reacts with sulphur dioxide., 19)Classify the following reactions into Exothermic and Endothermic reactions., a)Magnesium ribbon when burned in air, it forms magnesium oxide., b)HCl + NaOH → NaCl + H2O + Heat, c)2KClO3(s) ⃤, , 2KCl(s) + 3O2, , d)CaO + H2O → Ca(OH)2 + Heat, e)CaCO3(s), , CaO(s) + CO2, , 20)Distinguish between Direct current and alternating current., 21)How does the short circuit form?What is its effect?, , 22)Write Fleming’s Right hand rule and Left hand rule., , 23)What is an electric motor?In which appliances do we use it?, , 24)Name any two appliances which works on the phenomenon of magnetic effect of, electric current., , 25)Name any two appliances which works on the phenomenon of heating effect of, electric current., , 26)Explain the Right hand thumb rule with the help of diagram., 27)Explain the importance of fuse wire.(Uses), , 28)Draw a neat and labelled diagram of Hope’s apparatus., 29)Name the following diagam appropriately., , 30)Observe the following diagram and write the answers to the questions given below.

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a)Which process does the graph represent?, , b)What is the range of temperature responsible for the behaviour?, 31)How much heat will be required to raise the temperature of 5kg of water from, 20˚Cto100˚C?, , 32)Find the amount of heat needed to raise the temperature of a silver container of, mass 100g by 10˚C.(c=0.056cal/g˚C), , 33)If water of mass 60g and temperature 60˚Cis mixed with water of mass 60g and, temperature 40˚C,what will be the maximum temperature of the mixture?, , 34)Find the amount of needed to raise the temperature of a piece of iron of mass, 500gby 20˚C.(c=0.110cal/g.˚C), , 35) If the absolute refractive index of water is 1.36,find the speed of light in, 8, , water.(Speed of light in vacuum=3×10 m/s., , 36)If the absolute refractive index of glass and water are 3/2 and 4/3 respectively,what, is the refractive index of glass with respect to water?, , 37)Solve the following example., 8, , Speed in first medium v1=3×10 m/s, 8, , Speed in second medium=2×10 m/s, Then, , 2, , 𝑛 =?, 1, , 38)Draw a neat and labelled diagram for:Dispersion of light., 39)Observe the given figure and name the following.

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40)What is refraction of light? Explain with the help of example., 41)What is meant by dispersion of light?, 42)State the laws of refraction of light., , 8, , 43)If the speed of light in a medium is 1.5×10 m/s, what is the absolute refractive index, of the medium?, 44) When a copper coin is dipped in the solution of silver nitrate ,it shows a lusture on, its surface.explain this process with the help of chemical equation., , 45)Electronic configuration of metal A is 2,8,1.Electronic configuration of Metal B is, 2,8,8,2.Which of the above metals is more reactive?Explain with reason., , 46)Classify the following metals based on their reactivity., Cu,Zn,Ca,Mg,Fe,Na,Li,Hg, More reactive, , Moderately reactive, , Less reactive, , 47)Write the molecular formulas of the following compounds., a)Cryolite, , b)Fluorspar, c)Sodium aluminate, d)Copper pyrite, e)Stanic oxide, , f)Ferrous tungstate, , 48)Explain the concept of Roasting and Calcination., 49)a)What is an alloy?, b)Give two examples of alloy., , 50)Explain Bayer’s process.

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51)Differentiate between Calcination and Roasting., 52)Draw a neat and labelled diagram for Froth Floatation Process., , 53)Explain the reactions of nonmetals with water with the help of examples., 54)Explain the characteristics of Ionic compounds., , 55)What are amphoteric oxides?Explain with the examples., 56)Explain the Catenation power., 57)Explain the characteristics of covalent bond., , 58)Explain the term Structural isomerism with example., 59)Explain the following terms with example., a), , Oxidising agent, , b)Reduction, , 60)Explain the concept of heteroatoms with the help of examples., 61)Explain the following reactions with examples., a)Addition reaction, , b)Substitution reaction, , c)Esterification, , d) Saponification, , 63)What are catalysts?Give a chemical reaction in which a catalyst is used., 64)Write the characteristics of Ethanol., , 65)What are vinegar and gasohol?What are their uses?, 66)Write the uses of ethanol., , 67)Write the characteristics of ethanoic acid., , 68)What is meant by space debris? Suggest the ways to manage space debris., 69)Bring out the contribution of India’s space missions., 70)What is Medium Earth Orbit?, 71)Calculate the critical velocity of the satellite to be located at 35780Km above the, surface of earth., , Question 2 b)II. Distinguish between:, 1)Universal gravitational constant - Gravitational acceleration of the earth, 2) Group - Period, , 3)s-block - p- block, , 4)Group17 - group 18, , 5)Mendeleev’s periodic table - Modern periodic table, 6)Concave lens - Convex lens, 7)Farsightedness- Nearsightedness, 8)Myopia - Presbyopia, , 9)Metals -Nonmetals (physical characteristics), 10)Roasting - Calcination, , 11)Froth floatation - Leaching, 12)Saturated hydrocarbons - Unsaturated hydrocarbons, , 13)Open chain hydrocarbons -closed chain hydrocarbons, 14)Alkane- Alkene, , 15)High Earth orbit - Medium Earth orbit.

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Que 2B) III.write short notes., , (2m each), , 1) Escape Velocity, 2) Free Fall, 3) Anomalous behaviour, 4) Specific capacity, 5) dew point temperature, 6) r e g e l a t i o n, 7) catenation power, 8) characteristics of carbon, 9) functional group carbon compounds, 10) Homologous series, 11) aromatic hydrocarbons, 12) moon missions, Que 2B) IV. Explain the following reactions with the balanced equations.(2, marks each)., 1), , sodium burns in air, , 2) reaction of aluminium with oxygen, 3) magnesium reacts with dil hcl, , 4) aluminium reacts with dil hydrochloric acid, 5)reaction of Zink with dil hydrochloric acid, 6)sulphur burns in air, , 7))chlorine dissolved in water, , 8)sodium aluminate reacts with water, 9)ferrous dissolved in aqueous solution copper sulphate., 10)Ferric oxide is reacted with aluminium., 11)electrolysis of alumina is done., , 12)dry aluminium hydroxide is ignited in at1000°c, 13)zinc oxide is heated strongly in excess of air, , 14)zinc carbonate is heated strongly in limited supply of air, 15)zinc oxide is treated with carbon, Que 2 B) V. Explain concept with example / explain with the help of balanced, equation. (Each 2 m), 1), , ionic bond and ionic compounds, , 2) ganauge, 3) Ores, , 4) Roasting and calcination, 5) corrosion

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5) Minerals, Que.2 B) VI. Draw a neat labelled diagram. ( 2m each.), 1)Magnetic separation method, 2) Froth flotation, , 3) Electrolysis reduction of alumina, 4) Hydraulic separation method, 5) electrolysis, 6) anodizing, , Que 2 B) VII. Complete flow chart given below ( 2m.each), 1), , 2), , 3), Symbol : -----------, , Valency : ----------------

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Atomic Number: ------------- Electronic configuration :-------Q.3.rd:Answer the Following.(3m.each), 1), , Observe the given figure and answer these following questions., , a) What is the conclusion about the orbit of a planet., , b) What is the relation between velocity of planet and distance from sun., c) ASB, CSD and ESF relation between areas explain., 2), , Write the Kepler's law., , 3), , State Newton's universal law of gravitation. Express it with the mathematical form, , 4), , An object takes 5 s to reach the ground from a height of 5 m on a planet. What is, , 5), 6), , 7), 8), 9), , of force of gravitation?, , the value of g on the planet?, , The radius of planet A is half the radius of planet B. If the mass of A is MA, what, must be the mass of B so that the value of g on B is half that of its value on A?, , The mass and weight of an object on earth are 5 kg and 49 N respectively. What, will be their values on the moon? Assume that the acceleration due to gravity on, the moon is 1/6th of that on the earth., , An object thrown vertically upwards reaches a height of 500 m. What was its initial, velocity? How long will the object take to come back to the earth? Assume g = 10, , 2, , A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m/s ,, calculate its speed on reaching the ground and the height of the table?, The masses of the earth and moon are 6 x 10, , 24, , 5, , kg and 7.4 x 10, , 22, , kg, respectively., , The distance between them is 3.84 x 10 km. Calculate the gravitational force of, -11, , 2, , 2, , attraction between the two? (Use G = 6.7 x 10 N m /kg ), , 10) The mass of the earth is 6 x 10, 11, , 24, , kg. The distance between the earth and the Sun is, , 1.5 x 10 m. If the gravitational force between the two is 3.5 x 10, -11, , 2, , -2, , mass of the Sun? Use G = 6.7 x 10 N m kg ., , 22, , N, what is the

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11), , A tennis ball is thrown up and reaches a height of 4.05 m before coming down., What was its initial velocity? How much total time will it take to come down?, 2, , a), , Assume g = 10 m/s ?, , State mendeleev's periodic law. On which basis mendeleev organised periodic law ?, , b), , State limitations of Dobereiner's law of triads ?, , c), , Describe the merits of the mendeleev's periodic table?, , d), , What are the demerits of mendeleev's periodic table?, , e), , Write name of elements, symbol, atomic number, electronic configuration of, second period in modern periodic tables?, , f), , 10, 20, 7 write information about the given atomic number in the table., Atomic, , Electronic, , Number, , configuration, , Groups, , Periods, , Elements, , 10, 20, 7, 12) An x element with atomic number 11, , and Y element with atomic number 13, , belong s to the third period in the modern periodic table with this information, given in the answers of the below question., a) Which elements are more metallic characters from these two elements?, b) what is the valency of X व Y elements?, c) atoms size of Y element is smaller than atoms size of X element? explain?, 13) Identify periods of elements and block of elements from given electronic, configuration.?, a) 2, 8, 2, , b) 2, 8, 7, , 14) Position of, , c) 2, 1, , A, B & C three elements is given in the table from the modern, , periodic table. Answer the following questions?, Periods, , Group 2, , Group 17, , 2, , ------, , A, , 3, , B, , -------, , 4, , -------, , C, , a) what is A element metal or nonmetals?, b) which is the outermost orbit of element B ?

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C), , identify C element and it's physical state?, , 15) 3,1,2 electrons are in valence shell of X , Y , Z elements from this in which groups, it belongs and write it's valency, 16) Match the columns., a), , Reactants, , Products, , Types of chemical reaction, , b), , MgH2 →, , Mg + H2, , Endothermic, , c), , 2H2S + SO2, , →, , 3S + 2H2O, , Oxidation, , d), , CaO + H2O, , →, , Ca(OH)2 + heat, , Exothermic, , Redox, 17) Write three steps of writing chemical equations with example?, 18) Identify the following reactions the reactants undergo oxidation and reduction.and, write it?, a), , 2Ag2O →, , 4Ag + O2, , b), , 2Mg + O2, , →, , 2MgO, , c), , NiO + H2, , →, , Ni +H2O, , 19) Answer the following questions, a), , What is corrosion?, , b) what is Electrolysis?, c)which changes occur during chemical changes?, d) what is called The reaction which involves oxidation and reductions simultaneously ?, explain with one example?, 20) Explain the reaction given in figure?, , 21) Name any three appliances based on the heating effect of electric current., 22) Name any three appliances based on the magnetic effect of electric current Write, laws:-, , अ)Fleming right hand rule, आ) Fleming left hand rule, इ) Right hand thumb rule

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23) An electrical iron 1100 wt is operated for 2hours daily what will be the electrical, expenses for that in the month of April(the electrical charges 5 rs.per unit of, energy), , 24) What is overloading?when does it occur?What does it cause?How can overloading, be avoided?, , 25) Explain the construction and working of electric motors in short., 26) Write a short note on the galvanometer., 27) What is the use of earthing wire?, , 28) Explain the application of heating effect of electric current in an electric bulb with, diagram., , 29) Draw a neat labelled diagram to show the magnetic effect of electric current., 30) Name the following diagrams and explain the concept behind them., , 31) Identify the given figure, write the labels of it., , 32) Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater, in 20 mins?, 33) Which principle is used to measure the specific heat capacity of a substance?, 34) decide the unit for specific heat capacity., 35) In cold regions in winter, the rocks crack due to anomalous expansion of water, Explain term.

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36) Explain how heat capacity of a solid can be determined by the method of mixture., 37) What is meant by latent heat? How will the state of matter transform if latent heat, is given off?, 38) What is the role of anomalous behaviour of water in preserving aquatic life in, regions of cold climate?, 39) How can you relate the formation of water droplets on the outer surface of a bottle, taken out of the refrigerator with formation of dew?, 40) 'Geeta observed white trail at the back of aeroplane in a clear sky to answer the, question from this incident given below., i)what will be the effect of relative humidity of the air surrounding the plane?, ii)i)what will be the effect of relative humidity of the air surrounding the plane is low?, iii) when the air is dry and humid?, 41) Observe the given picture & answer the following questions., , a) which property do you understand in this picture?, b) what is the temperature of the water at the surface?, c) what is the temperature below the layer of ice on the surface?, 42) read this activity and Answer the following questions., 1) Take three spheres of iron, copper and lead., lead of equal mass., 2)Put all the three spheres in boiling water in the beaker for some time., 3) Take the three spheres out of the water., 4)All the spheres will be at temperature 100°c, C. Put them immediately on the thick slab of wax, 5)Note, the depth that each of the sphere goes into the wax, Que:, a)which property is determined from this activity?, b) give name to that property., c) explain the term Principal of heat exchange with the help of this activity .

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43) The cold object the hot object enclosed in a one box of heat resistant material, a) what changes will occur in the two objects when temperature flows from those, objects ?, b)which principle can show that the energy exchange takes place between two objects, only?, 44) Rainbow is a beautiful natural phenomenon. It is the combined effect of a natural, 45), , three processes together produced by light.write it into the circle., , 46) Observe the given figure and write appropriate phenomenon of light in the box., , 47) Observe the given figure and answer the following questions., , a. Which colour light rays bends most?, b. Which colour light rays bends least., , c. What is the wavelength of violet light rays?, , 48) Find the power of a convex lense of focal length of + 25 c.m, 49) If a convex lense focal length is 20 c.m at what is the power of the lens?

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50) If each two concave lense of focal length 30 c.m are kept in contact with each other, what will be the power of combination., 51) An object is placed at a distance of 10 c.m a convex lens of focal length 12 c.m, found at what distance object placed from the lens . position and nature of image, 52) 5 cm high object is placed at a distance of 20 cm from a converging lens of focal, length of 10 cm. Determine the position, size and type of the image., 53) An object is placed vertically at a distance of 20 cm from a convex lens. If the, height of the object is 5 cm and the focal length of the lens is 10 cm, what will be, the position, size and nature of the image?how much bigger as compared to the, object?, 54) Two convex lenses of focal length 30 c.m and 10 c.m each are kept in contact with, each other .Find the power of their combination., 55) In the following figure the change in the shape of the lens while seeing distant and, nearby objects complete the figure by correctly labelled diagram .

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56) Write the function of the human eye and label parts of the figure given below., , 57) Observe the given below figure, correct it and explain and write about what is your, concept about this figure., , 58), , Given below isDigram showing a defect of vision.name the defect of vision and, draw an accurate labelled diagram to correct this defect., , 59) Write laws in given figure., , 60) Observe the given figure and answer the following questions.

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a)Where are the above types of lens construction used ?, b)What type of image is formed by an objective lens?, e)What happens instead of placing at Fo if the object is placed in between O and, FO ?, 61), , Identify and Explain concepts given in this Diagram ?, , 62) Complete paragraph by choosing the right options given below., (minimum, near point, 25 cm, farthest, farthest distance), The …… distance of an object from a normal eye, at which it is clearly visible, , without stress on the eye, is called the minimum distance of distinct vision. The, position of the object at this distance is called the …… of the eye, for a normal, human eye, the near point is at ….... The ……. distance of an object from a human, eye, at which it is clearly visible without stress on the eye is called ……… of distinct, vision. The position of the object at this distance is called the ……… of the eye., 63) Choose the correct option from the bracket and complete the stanza., (colour blind, actual, conical , light sensitive, rodlike, colours ), The retina in our eyes is made up of many --------- cells. These cells are, shaped like a rod and like a cone.The ------- cells respond to the intensity of light, and give information about the brightness or dimness of the object to the, brain.The ---------- cells respond to the colour and give information about the, colour of the object to the brain.Brain processes all the information received and, we see the ------ image of the object.Rod like cells respond to the faint light also, but ------ cells do not.Some people lack conical cells responding to certain, colours. These persons can not recognize those colours or can not distinguish, between different ---------.These persons are said to be --------., A) What is corrosion ?, , B) Write the chemical name of Corrosion., C) Write a molecular formula for corrosion.

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64) Observe the following diagram and identify the type of reaction and write, observation ., , 65) Observe the following diagram and give answers., , A) Name the method of prevention of corrosion., B) For prevention of which metal this method is used?, C) What is used as Anode in this method?, , 66) Explain the Hydraulic separation method with a neat labelled diagram., 67) Observe the following diagram and write answers., , A) Name the method :----------B) Explain the method ., , C) Give two examples of this method.

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68) Observe the following diagram and write answers., , A) Name the method :----------B) Write Anode reaction and Cathode reaction ., , C) Why fluorspar and cryolite are added in the mixture ?, , 69) Identify the following method of concentration of ores and explain briefly ., , 70) Observe the following diagram and write answers.

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A) Write the name of two metals which react with water., B) Write the name of two moderately reactive metals ., C) Which is highly reactive and less reactive metal?, , 71) Explain the Froth floatation method with a neat labelled diagram., 72) Read the following passage and answer the questions., According to the reactivity series Zinc is more reactive than Iron, Iron is more, reactive than silver. During study of this a student deeped the iron nails in silver, nitrate solution., A. What is reactivity ?, B. What will happen when iron nails are dipped in silver nitrate solution ?, C. Which type of reaction happens when iron metal reacts with silver nitrate, solution ?, D. What will happen if a Zinc rod is used other than Iron nail ?, 73) Complete the following flowchart., , 74), , Complete the following flowchart., , 75) Complete the following flowchart.

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76) Homologous series of Alkanes., , 77) Homologous series of Alcohols, , 78), , Homologous series of Alkenes, , 79) Complete the given chart with writing the correct functional group of carbon, compounds., (Ester, Aldehyde, Ketone, Carboxylic acid, Alcohol,Ether)

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80) Complete the following table with writing correct structural formula and molecular, formula., Straight chain of carbon Structural formula, , Molecular formula, , Name, , C-C, , ……………., , ……………., , Ethane, , C-C-C-C, , ……………., , ……………., , Butane, , C - C - C - C- C- C- C, , ……………., , C7H16, , ……………., , C - C - C - C- C- C- C - C, , ……………., , C8H18, , ……………., , atoms, , 81) Complete the following table with writing IUPAC name of carbon compound., , 82) Complete the following activity.

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85) Observe the structural formula and answer the, following questions., 1. Write the name of the given hydrocarbon., 2. The given hydrocarbon included in which type of, hydrocarbon?, 3. What kind of compounds with the above characteristic, structure are called?, 86) Complete the following chart by using examples given, in brackets., (isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne,, isobutane, propene), , Straight Chain Hydrocarbons, , Branched chain Hydrocarbons, , Cyclic Hydrocarbon, , 87) Write the properties of Ionic compounds., 88) Observe the figure and write the answers., , A) Name the outer orbit., B) Which satellites revolve in low earth orbits ?, C) Which various orbits are given in the figure?, D) Give an example of a launch vehicle based on Newton’s third law., 89) Explain why spacecraft take longer to reach the moon than light?

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90) Write functions of Military satellite and Navigational satellite., 91) What is meant by Artificial satellite ? How are they classified depending on their, functions?, 92) If the mass of a planet is eight times the mass of the earth and its radius is twice, the radius of the earth, What will be the escape velocity for that planet?, 93) Explain : Escape velocity on the moon is less than escape velocity on the earth., 94) Complete the following chart., , Question no. 4 : Answer the following questions., 1), , (5 Marks each), , Read the given passage carefully and answer the questions., , We know that the gravitational force of the earth is applied to all objects.This, , force was used even when you were holding a stone in your hand. But the force you, were pushing in the opposite direction with your hand was balancing it so that the, stone was stable.When you let go of the hand ,only gravitational force is applied to, the stone, so the stone falls under its influence. When an object is moving only, , under the influence of gravitational motion, that motion is called free fall,that is the, stone falls. In free fall,the initial velocity is zero and it is increased due to, , gravitational acceleration over time.At the time of free fall on the earth , the friction, of the air opposes the motion of the object. So in the true sense free fall cannot, happen in the air. It can happen only in vacuum., , A) Complete the following statement by choosing the right option., The stone held in the hand is stable because on it ...., a) two unbalanced forces are exerted., b) only the gravitational force of the earth is exerted., c) gravitational force of the earth is not exerted., d) two balanced forces are exerted., , B)Why does free fall not happen on the earth?, , C)Why does the velocity of the object increase during the free fall?, D)Which type of force exerts on the object during free fall?, E) Why does free fall happen only in vacuum?

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2) Note the relationship between the entries in all the three columns in the table and, rewrite the table., Column-2, , Column-1, , Column-3, , Height from the earth’s, , (Location), , 2, , g (m/s ), , surface (km), , Earth’s surface(average), , 8.8, , Mount Everest, , 0.225, , 36.6, , 9.81, , 400, , 9.8, , Orbit of spacecraft, , 35700, , 9.77, , Orbit of communication satellite, , 0, , 8.7, , The highest height ever reached by, man made balloon, , 3) Observe the given cḥart and answer the questions given below., Element, , A, , B, , C, , D, , Electronic configuration, , 2, 1, , 2, 8, , 2, 8, 1, , 2, 8, 8, , A) Which elements are in the same row ?, , 1 mark, , B) Which elements have the same column?, , 1 mark, , C)Which elements are in the 18th column?, , 1 mark, , D)Which element is more reactive in A and C ?, , 1 mark, , A) Which of the following elements A and B is found in its compound? 1 mark, 4) XY Compound formed by X (Atomic number 11) and Y (Atomic number 17) then, answer the questions given below., A)Determine the position of the element X and Y in the modern periodic table., , 1 mark, , B) Which type of elements X and Y are metals, nonmetals or metalloids?, , 1 mark, , C)From which block the elements X and Y are?, , 1 mark, , D), , Determine, , the, , electronic, , configuration, , and, , valency, , of, , these, , elements., 2 marks

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5) Observe the periodic table given below and write the answers of the questions., , A)Write the name and valencies of the elements in 3rd row ., , 2 marks, , B)Classify the elements in this row in metal, nonmetal and metalloids.1 mark, C)Which block does nonmetals belong to?, , 1 mark, , D)Write name of any two metalloid elements., , 1 mark, , 6) Make a chart which shows the name of the element, valency, atomic, number,electronic configuration in the 2nd row of the modern periodic table.and, arrange these elements in ascending order of atomic mass., 7) What physical and chemical properties of elements did mendeleev consider in, compiling the periodic table ?What challenges did mendeleev face in following, periodic law?, 8) Explain structure of modern periodic table in short., 9) The electronic configuration of an element is 2,8,2 then write the answers of the, questions given below., A. What is the atomic number of this element?, B. Which column does this element belong to?, C. Which row does this element belong to?, D. The chemical properties of this element will be similar to which of the, following elements?, (Atomic numbers are given in the bracket), N (7), Be (4) , Ar (18), Cl (17), 10) Balance the given chemical reaction as per the instructions below.

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NaOH + H2SO4 → Na2SO4 + H2O, A)Write names of reactants and products of chemical reaction., B) Make a list of the elements in the chemical equation., C) write the number of atoms of reactants and products., D) Balance the equation with proper coefficient and rewrite the equation., E) Oxidation means losing electrons then what is reduction?, 11) Observe the following figure and write the answer of the question., , A) Which process is shown in the figure?, B) Explain the chemical reaction shown in the figure., C) Write the reactions on anode and cathode., 12) Draw a diagram of an electric motor and explain the structure and function of it., 13) Explain the structure and function by drawing a diagram of an electric generator., 14) Explain the magnetic field created by a current around a conductor from the figure., 15) Observe the figure and write the answers to the questions asked., , A) The structure shown in the figure is of which device?, B) Explain the principle on which this device works ., C)Write any three uses of this device.

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16) Observe the figure and write the answers to the questions asked., , A) The structure shown in the figure is of which device?, B) Explain the principle on which this device works ., C)Write any three uses of this device., , 17) Read the passage and answer the questions based on it., If heat is exchanged between a hot and cold object , the temperature of the cold, object goes on increasing due to gain of energy and the temperature of the hot, object goes on decreasing due to loss of energy.The change in temperature, continues till the temperatures of both the objects attain the same value.In this, process, the cold object gains heat energy and the hot object loses heat energy. If, the system of both the objects is isolated from the environment by keeping it inside, a heat resistant box then no energy can flow from inside the box or come into the, box. In this situation we get the following principle ., Heat energy lost by the hot object = Heat energy gained by the cold object. This is, called the ‘Principle of heat exchange’., A) Where does heat transfer take place?, B) In such a situation which principle of heat do you perceive?, C) How can this principle explain in short?, D) measuring the property of which substance this principle is used ?

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18) Explain the following temperature-time graph., , 19) Explain with a ray diagram the position, size,and the nature of the various images, formed by convex lenses., A) An object is at infinity., B) An object beyond 2F1., C) An object at 2F1 ., D) An object is in between F1 and 2 F2, E) An object is at focus F1, F) An object is in between F1 and O, 20) Explain in brief types of extraction of highly reactive, moderately reactive and less, reactive metals according to their reactivity., , 21) Explain Bayer’s process of concentration of bauxite with chemical equation., 22) Explain in brief electrolytic reduction of alumina with a neat labelled diagram., 23) Observe the figure and answer the following.

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A) Write the name of the method., B) What is used as anode and cathode in this method?, C) Write molecular formula and use of cryolite., D) Write anode reaction., , E) Write cathode reaction., 24) Observe the figure and name and explain in brief the following methods, A), , B), , 25) Answer the questions on the following passage., , The minerals from which the metal can be separated economically are, , called ores.Ores contain many types of impurities such as soil, sand and rocky, , substances along with the metal compounds. These impurities are called gangue., Metals can be extracted from their ores by means of various methods of, separation. The process of extraction of metal in pure state from the ores is also a, part of metallurgy., , Ores are taken out from the mines and the gangue is usually separated, , from the ore at the site itself by various methods.Then the ores are carried out to, , the place where metals are produced. Here metals are extracted in pure form. Then, metals are further purified by different methods of purification.this entire process, is called metallurgy.

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Most metals being reactive do not occur in nature in free state but are found, in combined state as their salts such as oxides,carbonates, sulphides and, nitrates.however, the most unreactive metals that are not affected by air,water and, other natural factors like silver,gold,platinum,generally occur in free state. The, , compounds of metals that occur in nature along with the impurities are called, minerals., A) What are metals?, B) Which processes are involved in the branch of metallurgy? What is, metallurgy?, C) Which metals are found in free state?, D) In what form are metals found in composite?, A) What is soil impurity?, 26) Explain the difference between a bayer’s process and a hall’s process by, explaining the bayer’s process?, 27) What is corrosion? Give solutions by giving examples of corrosion?, 28) Observe the figure and write the answers to the following questions., , A) Write the name of the reaction shown in the following figure., B) Write the above chemical reaction in the form of a balanced equation., C) Write the name of the product produced in the above reaction, write a use., D) Write the name of the catalyst used in the above reaction.

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29) Write the answers to the questions by observing the following figure., , A) Write the chemical reaction shown in the figure above in the form of a, balanced equation., B) Write the name of the gas coming out of the large test tube in the above, chemical reaction., C) Why do small bubbles of lime appear in the small test tube?, D) What is the change in color of lime net?, 30) Write the names of India's satellite series and launchers?, 31) What is a satellite launcher? Explain the external layout of a satellite launcher made, by ISRO (I.S.R.O.) with diagrams., 32) Read the following paragraphs and write the answers., Mars is the second closest celestial object to Earth after the Moon. It was sent to Mars, by many nations. But since the campaign was difficult, almost half of the, campaigns were not successful. But we have done something that we should be, proud of. Launched by ISRO in November 2013 at a very low cost, the Mars rover, was launched into Mars orbit in September 2014 and gained important information, about the surface and atmosphere of Mars., A) After the moon, which is the closest celestial object to the earth?, B) When did ISRO launch Mars spacecraft?, C) What important information did ISRO's Mars rover get?, D) Explain that specific velocity does not depend on the mass of the satellite?, 33) Explain the need and importance of space missions., *****************