Design of the Question Paper for S.S.L.C., Examination

Design of the Question Paper for S.S.L.C., Examination 2014-15
WEIGHTAGE TO CONTENT SCIENCE DIMENSION - 1 Industrial Organic Chemistry 3 Sound Metals Electromagnetic Induction 4

SSLC Model Question Paper-4
SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) Max Marks: Time: 60 minutes No. of Questions: Code No. : 83E Four alternatives are given for the each question. Choose the correct alternative and write the complete answer along with its alphabet in the space provided × 5 = 5 1) The enzyme that converts glucose into alcohol is (a) Invertase (b) Zymase (c) Lypase (d) Amylase THE ENZYME WHICH DIGEST THE PROTEIN? – PEPSIN THE ENZYME WHICH DIGEST THE FAT ? - LIPASE THE ENZYME WHICH DIGEST THE STARCH? - AMYLASE Enzyme Invertase converts Sucrose to glucose. Enzyme Zymase converts Sucrose to glucose.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 2. Identify the organic compound among the following. Carbon dioxide (b) Water (c) Calcium Carbonate (d) Formaldehyde

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 3. A ship sends ultrasonic sound. It returns from seabed and it is detected after 6 second. The ultrasound wave travelled distance is. (a) 4.5 km (b) 0.45 km (c) 90 km (d) 9.0 km D= Vt / 2 =330*6 /2 =990 m

Converts current to lower or Higher Voltage
SSLC Model Question Paper-4 SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 4. In the following device the magnetic field linked to the coil changes continuously, producing very high voltage. A.C. dynamo (b) D.C. dynamo (c) Transformer (d) Induction coil Low Voltage Converts current to lower or Higher Voltage

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 5. Heating of the ore in the absence of oxygen is called (a) Calcination (b) Roasting (c) FrothFloatation (d) Hydraulic washing Roasting -heating the ore just below its melting point in the presence of air. Calcination - is also a process of heating the ore just below its melting point in the absence of air with a purpose of driving away matter like water and carbon dioxide.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 6. Write the uses of the following Alloys. a) Stainless steel b) Invar c) Brass Ans: 1) Stainless steel in Surgical instruments, utensils. 2) Invar is used in precision measuring tapes 3) Brass - Electrical contact parts, Utensils and decorative articles

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 7. Write the classification of carbohydrates Ans: Carbohydrates are classified as 1) Monosaccharaides 2) Disaccharide 3) Poly saccharides

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 8. Sodium metal Stored in kerosene why? Ans:Sodium metal reacts with air and water but it does not react with kerosene: this is the reason for preserving sodium in kerosene.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 9. Traffic control authorities used the radar gun why? OR Astrologer used the Doppler Effect why? Ans: Traffic control authorities use Doppler Effect to detect vehicles crossing speed limit. Or Radio waves are sent in the direction of the speeding galaxies and the reflected waves are received. The change in the frequency of the waves is used to determine the speed of the galaxies.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 10. What is flux? What is the flux used in iron extraction? Or What is the action of the following metals with water? Write the equations. a) Zinc b) Iron Ans: Flux is a substance that is added to the ores before heating with a purpose of removing certain unwanted impurities which are not removed during the concentration of ore. And flux used is – limestone

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 10. What is flux? What is the flux used in iron extraction? Or What is the action of the following metals with water? Write the equations. a) Zinc b) Iron Or Ans: When metals react with water, hydrogen is liberated. a) Sodium:Sodium Metal reacts with water to produced sodium hydroxide and hydrogen gas. 2Na + 2H2O 2NaOH + H2 b) Zinc:Zinc metal reacts with water to produced zinc oxide and hydrogen gas. Zn + H2O ZnO + H2 c) Magnesium:Magnesium metal reacts with water to produced magnesium oxide and hydrogen gas. Mg + H2OMgO + H2 d) Iron:Iron react with water to produced Ferric oxide and hydrogen gas. 3Fe + 4H2OFe3O4 + 4H2

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 11. How ethyl alcohol is manufactured from sugar? Ans: Molasses is diluted with water and acidified by adding dilute sulfuric acid yeast is added to the solution and the container is closed. The temperature is maintained around 38k. Fermentation takes place in about a week. The fermented matter is called wort· and it contains about 6 to 10 percent alcohol. It is fractionally distilled to obtain 95 %alcohol.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 12. What is Doppler Effect? Doppler effect cannot be observed when the source of sound and the observer are stationary, justify. OR Justify the statement “Ultrasonic waves are useful because they have high frequency by giving two examples. Answer: The apparent change in the frequency of a sound wave or light wave when there is relative motion between the source and the observe is called Doppler Effect. Or Used to break gallstones. Used in sterilization. Used in mixing of immiscible liquids.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 13. Which property of the diode is used to convert AC into D.C? Explain this property. Ans :- Rectification , Diode allows current to pass only when it is forward biased when AC voltage is applied across a diode, the current flows only in that part of the cycle when diode is forward biased. This property is used to rectify AC voltages or to convert to DC voltages. And the device used for this purpose is called rectifier. x

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 14. Sodium displaces hydrogen from dilute acids. Violently but copper does not displace hydrogen from dilute acids’ Why? . Ans :- Sodium has higher reactivity or it is highly reactive so it displaces hydrogen from dilute acids. But Copper is less reactive so it is not able to displace hydrogen from dilute acids.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 15. Small amount of copper is added to ornamental gold. Why? Ans :- Pure gold is too soft to make ornaments with artistic design and patterns. Addition of small quantity of copper to it makes it hard and improves the look and the colour.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 16. Draw a diagram of Ac dynamo and label the parts Ans :- i) ABCD -An armature which is a rectangular coil of insulated wire wound over a core of soft iron. ii) Slip rings R1, R2 iii) Carbon Brushes B1, B2 iv) Permanent magnet N,S. v) L -Lamp

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 17. a) State the Faraday's laws of electromagnetic induction a) Ans :- I law : Whenever a magnetic field linked with a conductor changes, an induced e.m.f. is generated in the conductor. II law : The magnitude of induced emf is directly proportional to the rate of change of magnetic field linked with the conductor.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 17. b) Symbolic representation of a transformer is given below If the voltage in primary coil is 250V, then find the voltage in secondary coil. b) Ans :- Given:- Vp = 250 V Np = Ns = 20

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 18. Draw a neat diagram of blast furnace used in the extraction of Iron.

SCIENCE (Industrial Organic Chemistry, Sound, Metals , Electromagnetic Induction) 18. Write the balanced chemical reaction that takes place in the blast furnace during the extraction of iron. Ans:- The main chemical reactions that take place in the furnace are given below. I. i) Limestone heat Quicklime or calcium oxide + Carbon dioxide CaCO3 heat CaO + CO2 ii) Calcium Oxide +Silica Calcium silicate (slag) CaO + SiO2 CaSiO3 Lime stone helps in the removal of silica from the ore in the form of calcium silicate slag. II. Carbon + Oxygen Carbon monoxide (In the blast furnace due to the limited supply of oxygen carbon monoxide is formed instead of carbon dioxide) 2C + O2 2CO Haematite + Carbon monoxide Molten iron + Carbon dioxide Fe2O3 + 3CO 2Fe + 3CO2 Coke helps to reduce the oxide of iron to iron. Slag is lighter than molten iron and collects on the molten iron. Slag prevents the oxidation of molten iron back into oxides of iron. The molten iron is converted into solid blocks called pigs.

36. a) ‘Glycine’ is a poly functional compound.
b) ‘Norit’ is used in the preparation of sugar. c) In Indian system of Medicine Jaggery was widely used than sugar. 42. Around the cardboard tube A coil of insulated copper wire is connected to galvanometer. What would happen if a bar magnet is, a) pushed into the coil. b) magnet in taken out of the coil. c) magnet and the coil remain stationary. d) the number of the turns of the coil is decreased and the magnet is pushed in the coil.

9. Mention any two uses of ultrasonic waves.
Write the balanced chemical reaction that takes place in the blast furnace during the extraction of iron. 9. Mention any two uses of ultrasonic waves. 10. Define electromagnetic induction. On what factors does the induced emf depend? OR State faraday’s laws of electromagnetic induction. 11. What is Doppler Effect? Doppler effect cannot be observed when the source of sound and the observer are stationary, justify. OR Justify the statement “Ultrasonic waves are useful because they have high frequency by giving two examples. 12. Which property of the diode is used to convert AC into D.C? Explain this property. 13. Traffic control authorities used the radar gun why? OR Astrologer used the Doppler Effect why? 14. State Faraday’s first law of electromagnetic induction. 15. How are the scientists can identify the positions of the artificial satellite of mars? 13. Draw a diagram of Ac dynamo and label the parts. 16. Small amount of copper is added to ornamental gold. Why? 18. Sodium displaces hydrogen from dilute acids. Violently but copper does not displace hydrogen from dilute acids’ Why? 26. The frequency of a sound wave is 300 Hz and its wavelength is 1.6 m. Calculate the speed of the wave. In the manufacture of sugar, the sugar care juice is treated with calcium hydroxide why? What isthe reason for using coconut shell charcoal inthe manufacture of sugar? 40. Draw a neat diagram of blast furnace used in the extraction of Iron.

1. The vegetable contains more sucrose is
a) Radish b) Beetroot c) Potato d) Green leaves 2. The fermented matter of molasses is called. a) Raw material b) Wart c) Bagasse d) Precipitate 3. Molecular formula of methanol is Ans:CH3OH 4. Write the molecular formula of sucrose Ans: C12H22O11 5. Name the preservative to prepare fruit jams? Ans: Sugar 6. Give an example for natural polymer. Ans: Starch 7. Write the classification of carbohydrates Ans: Carbohydrates are classified as 1) Monosaccharaides 2) Disaccharide 3) Poly saccharides 8. What is bagasse? Mention its uses. Ans: The Cellulose material of the sugar cane residue is called bagasse. It is used as a fuel or as raw material to prepare cardboard. 9. How ethyl alcohol is manufactured from sugar? Ans: Molasses is diluted with water and acidified by adding dilute sulfuric acid yeast is added to the solution and the container is closed. The temperature is maintained around 38k. Fermentation takes place in about a week. The fermented matter is called wort· and it contains about 6 to 10 percent alcohol. It is fractionally distilled to obtain 95 %alcohol. 10. Mention any two example of fermentation? Ans: - Milk turning into curd - The batter of idli and dose rising up - The spoilage of cooked wet food items

1. Sucrose is a type of a) Monosaccharide
Card No. 2 1. Sucrose is a type of a) Monosaccharide b) Disaccharide c) Polysaccharide d) saccharide Ans: b) Disaccharide 2. Molases is acidified by adding. a) Conc HNO3 b) Dil H2SO4 c) Conc HCL d) Conc H2SO4 Ans: b) Dil H2SO4 3. The molecular formula of ethanol is a) CH3OH b) C2H4(OH)2 c) C2H5OH d) HCHO Ans:b) C2H4(OH)2 4. How sucrose obtained? Ans: Sugar cane or sugar beet is cut into pieces, crushed in a series of roller mills, maximum extraction of the juice is ensured. The juice is warmed and run into settling tanks. It is then decented from the sediment and made alkaline with calcium hydroxide. The impurities get precipitated. The liquid is steamed to coagulate protein matter and allowed to settle. The clear juice is concentrated into syrup by evaporation under reduced pressure. The syrup is cooled, to crystrallise the sugar. The crystals are dissolved in hot water and decolourised with animal charcoal or with coconut shell and then filtered. The filtrate is concentrated and evaporated under reduced pressure to get syrup which is crystallised to get white crystals of sugar (sucrose) 5. What is caramel? Where is it used? Ans: When sugar is heated to about 473K. It forms a sticky to chew substance called ‘caramel.’ caramel is used to make hard boiled sugar candy, and to coat the chocolates.

6. What is fermentation? Give example.
Ans: Fermentation is a chemical decomposition produced by microorganisms on certain organic matters. Examples: Milk turning into curds, the batter of idli. 7. Use of sugar is recommended more than jaggery why? Ans: When compared to jaggery the shelf life if sugar is more. It can be stored easily in any climatic conditions. 8. Mention the four steps involved in manufacture of sugar. Ans: i) Extraction of the juice from the sourceii) Purification of the juice. iii) concentration and crystallization iv) Separation and drying of crystals. 9. How alcohol is used in Ayurveda? Ans: In many ayurvedic tonics self-generated alcohol is present to a small extent. It stimulates and improves appetite 10. In which form do carbohydrates get assimilated in our body? Ans:Glucose

11. Why jaggery is preferred to sugar for daily use?
Ans: Jaggery is almost sucrose containing natural colouring matter and some minerals, so jaggery is preferred instead of sugar. Card No. 3 1. The product formed when a pinch of sugar is strongly heated for fifteen minutes in a test tube. a) Carbon and water b) Carbon Hydrogen and 2xygen c) Carbondixced &water d) Carbondioxede &Hydrogen vapour Ans: a) Carbon and water 2. The residue of sugar can from which the juice is extracted can be used to prepare. a) Menace b) Card board c) alcohol d) building material Ans: b) Card board 3. During evaporation of cleaned sugar cane juice, pressure surrounding it is reduced to a) increase the boiling point b) maintain the boiling point to 373k c) decrease the boiling point d) increase the size of sugar crystal Ans: d) Increase the size of sugar crystals 4. What is celotex? Ans: The cellulose materials of sugar cane residue are used as raw material to prepare card board is called as celotex. 5. Sugar is used as preservative, Give reason. Ans: Concentration of sugar does not undergo fermentation so it is used as preservative. 6. What is molasses? Mention its use in industry. Ans:During the extraction of sugar,the uncrystallised syrup is called molasses. 7. Write the balanced equation of molasses fermentation. 8. Which gas is evolved during fermentation? Ans: Carbondioxide is evolved in fermentation 9. Write three steps involved in fermentation. Ans: a) Dilution of molasses by water b) Addition of yeast c) Distillation of fermented matter 10.What is wort? How much Alcohol is present in it? How it is nriched? Ans: The fermented matter is called wort. It contains 6 to 10 percent Alcohol By fractional distillation enrich the percentage of Alcohol.

General Questions fo Fifterd Students
1. What is the action of the following metals with oxygen of air? Write the equations. a) Sodium b) Copper c) Magnesium Ans: Metals generally react with different components of the air. Different metals react in different ways under different conditions. They react with oxygen of air to produce their respective oxides. a) Sodium: Sodium reacts with the component of air gradually to produce sodium carbonate. 4Na + O22Na2O Na2O + CO2Na2CO3 When sodium burns in excess of oxygen, it produces sodium peroxide 2Na + O2Na2O2 b) Copper: Copper reacts with the air to produce is an oxide of copper. 2Cu + O2  2CuO c) Magnesium: Magnesium reacts with the air to produced magnesium oxide. 2Mg + O22MgO 2. Sodium metal Stored in kerosene why? Ans:Sodium metal reacts with air and water but it does not react with kerosene: this is the reason for preserving sodium in kerosene.

3. Which compound to require for iron to rust?
Ans:Air and Water are required for iron to rust. 4. What is rust? Write its chemical formula. Ans:The rust is hydrated oxide of iron. The chemical formula of rust is Fe2O32H2O. 5. How to Iron is protected from rust. Ans:Iron is protected from rusting by coating it with zinc or by painting it. Iron pipes are protected by heating and then dipping them in molten coal tar. 6. What is the action of the following metals with water? Write the equations.a) Sodium b) Zinc c) Magnesium d) Iron Ans:When metals react with water, hydrogen is liberated. a) Sodium:Sodium Metal reacts with water to produced sodium hydroxide and hydrogen gas.

2Na + 2H2O 2NaOH + H2 b) Zinc:Zinc metal reacts with water to produced zinc oxide and hydrogen gas. Zn + H2O ZnO + H2 c) Magnesium:Magnesium metal reacts with water to produced magnesium oxide and hydrogen gas. Mg + H2OMgO + H2 d) Iron:Iron react with water to produced Ferric oxide and hydrogen gas. 3Fe + 4H2OFe3O4 + 4H2 7. What is the action of the following metals with dilute hydrochloric acid? Write the equations. a) Zinc b) magnesium c) iron Ans:Metals react with dilute hydrochloric acid to produce hydrogen with the formation of their respective metallic chlorides. a) Zinc: Zinc metals react with dilute hydrochloric acid to produce zinc chloride and hydrogen gas. Zn + 2HCl ZnCl2 + H2 b) Magnesium: Magnesium metals react with dilute hydrochloric acid to produce Magnesium chloride and hydrogen gas. Mg + 2HCl  MgCl2 + H2 c) Iron: Iron metals react with dilute hydrochloric acid to produce Ferric chloride and hydrogen gas. 2Fe + 6HCl 2 FeCl3 + 3H2

8. What is the action of the following metals with dilute sulphuric acid? Write the equations. a) Zinc b) magnesium c) iron Ans:Metals react with dilute sulphuric acid to produce hydrogen with the formation of their respective metallic sulphates. a) Zinc: Zinc metals react with dilute sulphuric acid to produce zinc sulphate and hydrogen gas. Zn + H2SO4ZnSO4 + H2 b) Magnesium:Magnesium metals react with dilute sulphuric acid to produce Magnesium sulphate and hydrogen gas. Mg + H2SO4Mg SO4 + H2

3Cu + 8 HNO33 Cu ((NO3)2 + 2NO + 4H2O
c) Iron: Iron metals react with dilute sulphuric acid to produce Ferric sulphate and hydrogen gas. Fe + H2SO4Fe SO4 + H2 9. What is the action of the following metals with nitric acid? Write the equations. a) Zinc b) magnesium c) copper Ans:Metals react with nitric acid to produce hydrogen with the formation of their respective metallic nitrates. Zn + 2HNO3Zn (NO3)2 + H2 Mg + 2HNO3Mg (NO3)2 + H2 Metals produce nitrates and nitric oxide with moderately concentrated nitric acid. 3Cu + 8 HNO33 Cu ((NO3)2 + 2NO + 4H2O Metals produce metallic nitrates and nitrogen dioxide with concentrated nitric acid. Cu + 4HNO3Cu (NO3)2 + 2NO2+ 2H2O Copper produces cupric nitrate with nitric acid. 10. What is the action of the following metals with chlorine? Write the equations. a) Aluminium b) Iron c) copper Ans:Metals react with chlorine to form of their respective metallic chlorides. 2Al + 3Cl22AlCl3. 2Fe + 3Cl22FeCl3 Cu + Cl2CuCl2 11. Name any three metals that are available in their free state in nature. Ans:Gold, Silver and Platinum. 12. Identify the group and period of those metals in the periodic table. a) Copper b) iron Ans: a) Copper – 11th groups, 4th period. b) Iron – 8th groups, 4th period. 13. Write the atomic number, mass number, symbol and electronic configuration, of a copper atom. Ans: Atomic number- 29 Mass number – 64 Symbol – Cu

Electronic configuration – 1s22s22p63s23p63d104s1
14. Write the atomic number, mass number, symbol and electronic configuration of an iron atom. Ans: Atomic number- 26 Mass number – 56 Symbol – Fe Electronic configuration – 1s22s22p63s23p63d64s2 15. Name the ores of copper. Ans:The chief ore of copper is copper pyrites (CuFeS2). The other ores are copper glance (Cu2S), Cuprite (Cu2O), malachite [CuCO3Cu(OH)2] and azurite [2CuCO3Cu(OH)2] 16. Name the ores of iron. Ans:The ores of iron are: haematite (Fe2O3), magnetite (Fe3O4), limonite (Fe2O3 H2O) and siderite (FeCO3). 17. Draw the sketch of the following a) Blast furnace b) Electrolytic cell for purification of copper.

18. Explain the method of concentration of copper ore.
Ans:The finely powdered ore is mixed with pine oil and water in a large tank. The sulphide ore mixes with oil and forms a thin film. Oil does not have affinity for earthly materials. The materials other than the ore particles are wetted by water. When air is bubbled through the mixture, froth containing the particles of copper ore floats on top of water and can be skimmed off easily. This method, used to concentrate copper ore, is called frothflotation. 19. What are alloys? Ans:Alloy is a homogeneous mixture of (a) two or more metals, or (b) metals and non-metals. 11. Name any four alloys of each of the metals: a) copper b) iron a) Copper Alloy Components Uses Brass Copper and zinc Utensils, electrical appliances, machinery parts etc. Bronze Copper and tin Statues, bells, coins and utensils. German silver Copper, zinc and nickel Utensils, resistance coils, ornamental wares. Gun metal Copper, tin and zinc Barrels of guns, gears and castings.

Iron, carbon, nickel, chromium Surgical instruments Nickel steel
b) Iron Alloy Components Uses Stainless steel Iron, carbon, nickel, chromium Surgical instruments Nickel steel Iron and nickel Utensils drilling instruments Alnico Iron,nickel, aluminium, cobalt Magnets Invar steel Iron, nickel, carbon Making pendulum Nichrome Iron, nickel, chromium Heating coils. Steel Iron, carbon Pipes, nails, sheets and cutting tools.

21. What is meant by froth flotation?
20. Show with an example that iron is capable of displacing less reactive metals from the solution of their salts. Ans: Eg1: Iron displaces copper from copper sulphate solution and itself forms iron sulphate. This shows copper is less reactive than iron. Fe + CuSO4FeSO4 + Cu Eg2: Iron displaces silver from silver nitrate solution and itself forms ferrous nitrate. This proves that iron is more reactive than silver. Fe + 2AgNo3 Fe (No3)2 + 2Ag 21. What is meant by froth flotation? Ans:The method of concentration of copper ore by using water and oil is known as forth flotation. 22. Explain the method of purification of copper Ans:Purification of copper is done by electrolytic refining. A set of thick impure copper plates are connected together and dipped in copper sulphate solution taken in a tank. Copper sulphate is the electrolyte. A set of thin pure copper plates are connected together and dipped into the same solution such that the pure copper plates are interposed between the impure copper plates The set of pure copper plates is made cathode and the set of impure copper plates is made anode. This is done by connecting the sets to appropriate terminals of a battery. On passing direct current copper at the anode dissolves and get deposited on the cathode. The mass of cathode plates increases and that of anode plates decreases. Copper so obtained is 100% pure. SSLC KARNATAKA EXAM PACKAGE SCIENCE 124 23. Write the Physical properties of copper and Iron. Ans: Physical properties of copper: Copper is a rose red heavy metal. It is malleable and ductile. It is a very good conductor of electricity and heat. It is next only to silver in thermal conductivity. It has high melting point and high boiling point. Physical properties: Iron is a greyish white solid metal. Pure iron is soft. Iron is a ferromagnetic substance. Its melting point is 1808K.

1. Electron donor among the following is:
a) Potassium b) Phosphorous b) 2xygen d) Fluorine Ans: a) Potassium 2. The molecular formula of Hematite is: Ans: d) Fe2O3 3. Hydrogen gas is liberated under the followingcircumstance: a) Iron kept in boiling water b) water is poured on hot iron c) Steam is passed over red hot iron d) Iron is immersed in cold water. Ans: c) Steam is passed over red hot iron. 4. The alloy which used to make Aeroplane and railing coaches is a) Brass b) Bronze c) Duralumin d) Alnico Ans: c) Duralumin 5. Aluminum is extracted by a) Froath Floatated by b) Hydroulic process c) Hall - Heroult method d) Concentration of ore method. Ans: c) Hall - Heroult method 6. Name the metals which do not react with water? Ans: Platinum and gold

9. Write thetwo important ores of iron? Ans: Hematite and magnetite
7. Define metallurgy? Ans: The technology of extraction of metals from their ores and refining to the required form is called metallurgy. 8. What is flux? Ans: Flux is a substance that is added to the ores before heating with a purpose of removing certain unwanted impurities which are not removed during concentration of ore. 9. Write thetwo important ores of iron? Ans: Hematite and magnetite 10. What is hydraulic wash? Name the ore which suits these processes. Ans: The crushed ore when washed with stream of water lighter impurities will be washed away and heavy iron ore particles settle down this processes is called Hydrochloric wash. Hematite. 11. Write the role of slag in extraction of Iron from the ore. Ans: Slag prevents the oxidation of molten iron back into oxidesof iron. 12. Draw neat labeled diagram of extraction of Aluminum. 13. Name the three methods involved in purification of Metals. Ans: 1) Liquation processes 2) Zone refining or fractional crystallisaton 3) Electrolytic refining 14. Write any three physical properties of metals? Ans: Physical properties of metals 1) Solids at room temperature 2) Sonorous 3) Malleable and ductile 4) Conduct Electricity 5) Conduct heat 6) lustrous

a) Glass and ceramics are cheaper.
Card No. 3 1. Lemon juice is normally served in ceramics or glass tumblersinstead of metallic tumblers because. a) Glass and ceramics are cheaper. b) Metallic containers react with the acids of lemon c) Lemon juice produces combustible hydrogen gas withmetallic tumbler. d) Glass and ceramics keep the lemon juice cooler. Ans:b) Metallic containers react with the acids of lemon 2. Four metals, P.Q.R.S react with water as given below. i) P reacts with cold water ii) Q reacts with hot water iii) R reads with steam iv) Red hots reacts with steam then highly reactive metal is a) P b) Q c) R d) S Ans: a) P 3. Invar steel is used to make precision measuring tapes because. a) Its co-efficient of linear expansion is more b) Its least co-efficient of linear expansion c) It does not affected by chemicals d) Durability is more. Ans: b) It’s least co-efficent of linear expansion 4. The following element forms cations. a) Sulphur b)carbon c) Manganese d) Iodine Ans: c) manganese.

a) Soot on the surface of the foil. b) Sulphide of copper on the foil.
5. When a copper foil is heated in a flame, a black layer is seen on the copper foil. This is due to the formation of. a) Soot on the surface of the foil. b) Sulphide of copper on the foil. c) An oxide of copper on the foil. d) A carbonate of copper on the foil. Ans: c) An oxide of copper on the foil. 6. Name the chief ore of copper? Ans: Copper pyrites 7. Write the chemical name of rust. 8. What is roasting? Ans: Roasting is a process of heating the ore just below its melting point in the presence of air. 9. Give reasons. a) Sodium kept in kerosene. b) Iron is called ‘King of Metals’ Ans: a) Sodium is highly reactive element it forms oxides, hydroxide and carbonate with oxygen, water vapour and carbon dioxide in air. 10. What are alloys? Give two examples. Ans: Alloy is a homogeneous mixture of two or more metals in suitable proportion. Example: Steel, Brass 11. What is the reaction of copper with concentrated nitric acid? 12. Name the ore which occurs in Chitradurga district. Ans:Copper Pyrites 13. Write the balanced equation when aluminium reacts withchlorine gas. 14. Name the metals which occur free in state. Ans: Gold and platinum 15. Draw a neat labelled diagram blast furnace.

1. The Metal that cannot liberate Hydrogen with dilute acid is.
Card No. 2 1. The Metal that cannot liberate Hydrogen with dilute acid is. a) Sodium b) Aluminum c) Copper d) Potassium Ans: b) Aluminium 2. Bauxite is ore of a) Iron b) Aluminum c) Copper d) Mercury 3. Calcium Silicate produced during the extraction of iron. a) Is a slag b) is helpful in purifying iron c) Makes coke active d) helps to solidify molten iron. Ans: a) Is a slag 4. The components of Brass are. a) Copper and Tin b) Copper and carbon c) Copper and Zinc d) Copper and Nickel Ans: c) Copper and zinc 5. The Oxide that can form salt and water with a base as well as with an acid is. a) Carbon monoxide b) Sulphure dioxide c) Sodium oxide d) Aluminum oxide Ans: d) Aluminium oxide. 6. Name the reducing agent used in extraction of iron. Ans: Coke

7. Which metal is called “Poor man’s’’ silver?
SSLC KARNATAKA EXAM PACKAGE SCIENCE 115 Ans: Aluminium 8. Name the reactant and products in this reaction. 9. Write the reaction when magnesium heated in air. 10. Write any four chemical properties of metals and nonmetals. 11. Write four steps involved in metallurgy. Ans: 1) Concentration of ore 2) Roasting 3) Calcination 4) Purification of metals 12. Write the uses of the following Alloys. a) Stainless steel b) Invar c) Brass Ans: 1) Stainless steel in Surgical instruments, utensils. 2) Invar is used in precision measuring tapes 3) Brass - Electrical contact parts, Utensils and decorative articles 13. Draw neat labeled diagram of Electrolytic refining of copper. 14. Write the components of the following. a) Alnico b) Nickel steel c) Bronze. 116 15. Write any three contributions of Indians to the metallurgy. Ans: - Nlagarjuna’s book ‘Rasa ratnakara’ which explains the Preparation of various metalic compounds, the extraction and purification of metals. - Kutubminar construction is an excellent example of an alloy of iron. - The world famous bidri art is the skill of producing arte facts of ornamental value.

2. The metal which does not react with hydrochloric acid is
TEST YOUR KNOWLEDGE 1. Copper + Zinc + Nickel — This composition of metals is helpful in producing (A) Surgical instruments (B) Resistance coils (C) Heating coils (D) Cutting tools. 2. The metal which does not react with hydrochloric acid is (A) zinc(B) magnesium (C) platinum (D) iron. 3. The most reactive metal among the following is (A) Zinc (B) Magnesium (C) Iron (D) Sodium. 4. The biggest source of metal on the earth is A. Earth’s interior B. oceans C. earth’s crust D. fresh water lakes 5. Sea contains metals in the form of A. soluble salts B. insoluble salts C. precipitate salts D. floating salts 6. Bells are made of metal because of the following property A. Malleability B. Ductility C. Conductivity D. Sonority 7. Four different metals are taken in four different test tubes and concentrated sulphuric acid is Poured in to each of them. In one of the test tubes the solution turns blue then the metal is A. Zn B. Ni C. Co D. Cu 8. Brass, German silver and Gunmetal are the alloys of copper. Apart from copper the other common metal in them is A. zinc B. tin C. iron D. nickel. 9. The best combination of metal and an acid to prepare hydrogen gas is A. copper and nitric acid B. copper and dilute hydrochloric acid C. zinc and dilute hydrochloric acid D. copper and dilute sulphuric acid. 10. In the extraction of Iron: limestone, concentrated haematite ore and coke are mixed in the ratio, A. 8 : 1 : 4B. 4 :1 : 8C. 1 : 8 : 4 D. 8 : 4 : 1 11. Which of the following ores is a carbonate ore of iron? A. Haematite B. Magnetite C. Limonite D. Siderite. 12. Which of the following elements gives its oxide quickly when kept in air? (A) Magnesium (B) Iron (C) Sodium (D) Copper. 13. The concentration of copper ore is done by (A) hydraulic washing ( water washing ) (B) froth flotation (C) magnetic separation (D) electrolysis.

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Design of the Question Paper for S.S.L.C., Examination

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Design of the Question Paper for S.S.L.C., Examination

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