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science SSC QUESTION PAPER

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QUESTION PAPER

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science SSC QUESTION PAPER

  1. 1. Paper - 5 SECTION - A Q.I (A) Rewrite the following statements by choosing the correct 1 option : (i) Fuse is made up of ..................... . (a) iron and carbon (b) lead and tin (c) copper and zinc (d) copper and aluminum (ii) ..................... is an alloy of iron, nickel, aluminium and titanium. (a) Nipermag (b) Nichrome (c) Alnico (d) Tin Q.I (B) Rewrite the Column II so as to match the Column I : 1 Column I Column II (i) Electric motor (a) Mechanical energy to electric energy (ii) Electric generator (b) Domestic appliances like mixers, fan (c) One directional current Q.I (C) State whether the following statements are True or False : 1 (i) Electric generator is used to generate current. (ii) When the pH value is between 0 to 7, the solution is acidic. Q.II Answer the following as required : (Any Two) 4 (i) Explain the working of electric fuse. (ii) A magnetic crane is used to load and transport scrap iron. Why ? (iii) State the properties of bases. (iv) Explain the pH scale. Q.III (A) Solve the following : (Any One) 2 (i) If a bulb of 60 W is connected across a source of 220 V, find the current drawn by it. (ii) Find the heat generated in calories if a current of 0.2 A is passed through a coil of resistance 418  for 1 minute. Q.III (B) Draw neat and labelled diagram : (Any One) 2 (i) Magnetic lines of force around a bar magnet. (ii) Magnetic lines of force through a solenoid. S.S.C. Test - III Batch : SB Marks : 30 Date : Time : 1 hr. 15 min.SCIENCE – Chapter : 3, 4, 5, 8, 12, 13 MAHESH TUTORIALS
  2. 2. Paper - 5... 2 ... Q.IV Answer the following : (Any One) 2 (i) What is short circuiting ? (ii) What is a universal indicator ? Q.V Write balanced equations : (Any One) 2 (i) Iron reacts with dilute hydrochloric acid. (ii) Baking soda (sodium hydrogen carbonate) reacts with dilute hydrochloric acid. (iii) Copper oxide reacts with dilute hydrochloric acid. SECTION - B Q.I Fill in the blanks : 2 (i) Metal oxides are usually ....................... in nature. (ii) Chlorine is a ....................... . (iii) Dominant character masks the ..................... character. (iv) During unfavourable conditions, the amoeba secretes a hard covering called ....................... . Q.II (A) Give scientific reasons : (Any One) 2 (i) Kitchen articles like pressure cooker, pan etc. are anodized. (ii) In human beings the gamete from the male parents decides the sex of the baby. (iii) Children born to older women may be defective. Q.II (B) Answer the following : (Any Two) 4 (i) What is corrosion and explain the methods to prevent corrosion. (ii) Write balanced reactions : Calcium reacts with cold water. (iii) Distinguish between Metals and Non-metals. (iv) Explain disadvantages of large family size. (v) Write a note on budding in multicellular organisms (Hydra). Q.III Draw a neat and labelled diagram of the following : (Any One) 2 (i) Longitudinal section of flower. (ii) Human male reproductive system. (iii) Spore formation in Mucor. Q.IV Answer the following : (Any One) 5 (i) Describe the human female reproductive system. (Diagram not required) (ii) With the help of a diagram (Punnett square) show a Mendelian experiment where tall pea plant bearing red flowers is crossed with a short pea plant bearing white flowers. Write both the phenotypic and genotypic ratio for F2 generation. Best Of Luck 
  3. 3. Paper - 5 SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) Fuse is made up of lead and tin. (ii) Nipermag is an alloy of iron, nickel, aluminium and titanium. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric motor – Domestic appliances like mixers, fan (ii) Electric generator – Mechanical energy to electric energy A.I (C) State whether the following statements are True or False : (i) True. (ii) True. A.II Answer the following as required : (Any Two) (i) 1. An electric fuse protects circuits and appliances by stopping the flow of any excess electric current. 2. The fuse is placed in series with the device. It consist of a piece of wire made of an alloy of low melting point for example lead and tin. 3. If a current larger than the specified value flows through the circuit, the temperature of the fuse wire increases. 4. This melts the fuse wire and breaks the circuit. 5. The fuses used for domestic purpose are stated as 1A, 2A, 3A, 5A, 10A etc. (ii) 1. A magnetic crane consist of a magnetic disc to which all scrap and loose iron material get attracted. 2. Magnetism is induced in the disc, as it is not feasible to create a permanent magnet of such a big size and store such a big magnet. 3. Hence magnetic crane is used to load and transport scrap iron. (iii) 1. Bases have bitter taste. 2. Bases feel soapy to touch. 3. Bases turn red litmus blue. ½ ½ ½ ½ ½ ½ 2 2 2 S.S.C. Test - III Batch : SB Marks : 30 Date : Time : 1 hr. 15 min. SCIENCE – Chapter : 3, 4, 5, 8, 12, 13 MAHESH TUTORIALS MODEL ANSWER PAPER
  4. 4. Paper - 5... 2 ... 4. Basic solutions conduct electricity. 5. Bases react with some metals to give hydrogen gas. Eg. : When zinc reacts with sodium hydroxide, it gives water sodium zincate, Zn(s) + 2NaOH(aq)  Na2ZnO2(aq) + H2(g) Zinc Sodium hydroxide Sodium zincate Hydrogen 6. Bases react with acids to form salt and water. This reaction is called as neutralization reaction. Eg. : When hydrochloric acid reacts with sodium hydroxide, sodium chloride and water are formed. HCl + NaOH  NaCl + H2O Acid Base Salt Water Hydrochloric Sodium Sodium Water acid hydroxide chloride 7. Bases react with non-metal oxides to form salt and water. Eg. : When carbon dioxide is passed through lime water, it turns milky due to the formation of white precipitate of calcium carbonate. Ca(OH)2(aq) + CO2(g)  CaCO3(s) + H2O(l) Base (Acidic) Salt Water Calcium Carbon Calcium Water hydroxide dioxide carbonate Thus this is a neutralization reaction where by base reacts with non-metallic oxide (CO2) to form salt and water proving that metal oxides are acidic in nature. (iv) 1. The strength of an acid or base is measured on a scale of numbers called pH scale that has values from 0 to 14. pH scale helps in measuring hydrogen ion concentration in solutions. In pH, p stands for "potenz" (means "strength" in German). The scale reads from 0 (zero) (most acidc) to 14 (most basic). The value of pH indicates acidic or basic nature of a solution. The strength of base is represented by pOH. 2. When the pH value is in between 0 to 7, the solution is acidic in nature. 3. At value 7, the solution is neutral and between 7 to 14 the nature of the solution becomes alkaline/basic. 4. The pH of a solution is inversely proportional to the concentration of hydrogen ions in it. i.e. a solution having a high concentration of hydrogen ions has a low pH value. Acidic Neutral Basic 0 7 14 Most acidic Most basic 2
  5. 5. Paper - 5... 3 ... 2 2 2 A.III (A) Solve the following : (Any One) (i) Given : Power (P) = 60 W P.D. (V) = 220 V To find : Current (I) Formula : P = VI Solution : P = VI  I = P V  I = 60 220  I = 0.2727 A  The current flowing is 0.2727 A. (ii) Given : Current (I) = 0.2 A Resistance (R) = 418  Time (t) = 1 min = 60 sec To find : Heat (H) Formula : H = 2 I Rt 4.18 cal Solution : H = 2 I Rt 4.18 cal H = 2 (0.2) 418 60 4.18    H = 240 cal The heat generated is 240 cal. A.III (B) Draw neat and labelled diagram : (Any One) (i) Magnetic lines of force around a bar magnet. N S Magnetic lines of force around a bar magnet
  6. 6. Paper - 5... 4 ... 2 2 2 (ii) Magnetic lines of force through a solenoid. A.IV Answer the following : (Any One) (i) 1. If a live wire and a neutral wire come in direct contact or touch each other, short-circuiting takes place. 2. During a short circuit, the resistance of the circuit becomes very small and hence huge amount of current flows through it. 3. This produces a large amount of heat and raises the temperature. (ii) 1. The common indicators like litmus can tell us whether the given substance is an acid or a base. But they cannot tell whether the given substance is a strong acid, weak acid, strong base or a weak base. Thus to obtain an idea of how acidic or basic a substance is, universal indicator is used. 2. It is a mixture of many different indicators(or dyes) which give different colours at different pH values of the entire pH scale. Just like litmus, universal indicator can be used in the form of solution or in the form of universal paper indicator. 3. When an acid or base solution is added to the universal indicator, the indicator produces a new colour. The colour produced by universal indicator is used to find the pH value of acid or base by matching the colour with colours on pH colour chart. Thus by knowing the pH value, we can make out if the given solution is strong acid, weak acid, strong base, weak base. The colours produced by universal indicator at various pH values are given below : NS + – K Magnetic lines of force through a solenoid
  7. 7. Paper - 5... 5 ... 2 2 2 ½ ½ ½ ½ 2 4. Eg. : if on putting a drop of solution on the universal indicator and if it turns dark red, its pH will be 0 and so it is a strong acid. A.V Write balanced equations : (Any One) (i) When iron reacts with cold dilute hydrochloric acid to give iron(II) chloride and hydrogen gas. Fe(s) + 2HCl(aq)  FeCl2(aq) + H2(g)  Iron Hydrochloric acid Iron chloride Hydrogen (ii) When sodium bicarbonate (sodium hydrogen carbonate) reacts with dilute hydrochloric acid to give sodium chloride, water and carbon dioxide gas is liberated. NaHCO3(s) + HCl(aq)  NaCl(aq) + H2O(l) + CO2(g) Sodium Hydrochloric Sodium Water Carbon bicarbonate acid chloride dioxide (iii) When copper chloride reacts with dilute hydrochloric acid to give a blue solution of copper chloride. CuO(s) + 2HCl(aq)  CuCl2(aq) + H2O(l) Copper oxide Hydrochloric acid Copper chloride Water SECTION - B A.I Fill in the blanks : (i) Metal oxides are usually basic in nature. (ii) Chlorine is a non-metal. (iii) Dominant character masks the recessive character. (iv) During unfavourable conditions, the amoeba secretes a hard covering called cyst. A.II (A) Give scientific reasons : (Any One) (i) 1. Anodising is a technique used to make aluminium surface resistant to corrosion and abrasion. pH Colour pH Colour 0 Dark red 8 Greenish blue 1 Red 9 Blue 2 Red 10 Navy blue 3 Orange Red 11 Purple 4 Orange 12 Dark purple 5 Orange yellow 13 Violet 6 Greenish yellow 14 Violet 7 Green
  8. 8. Paper - 5... 6 ... 2 2 2 2. In this process, the anode reaction results in formation of black coloured thin film of aluminium oxide on the surface of article. 4Al + 3O2  2Al2O3 3. Kitchen articles like pressure cooker, pan etc are constantly subjected to heat, pressure and water causing corrosion and abrasion. 4. To avoid this, kitchen articles are anodized. (ii) 1. In human males, two dissimilar chromosomes are present, longer ‘X’ and shorter ‘Y’. 2. In human females, two similar longer ‘X’ chromosomes are present. 3. All children inherit ‘X’ chromosome from their mother. 4. If the offspring inherits ‘X’ chromosome from the father, then it will be a daughter and if it inherits ‘Y’ chromosome from the father, then it will be a son. 5. Thus in human beings the gamete from the male parents decides the sex of the baby. (iii) 1. At birth, the female ovary contains approximately 2-4 million eggs. After birth, new eggs are not added. 2. Out of this eggs, only about 400 are destined to be ovulated, while all others degenerate during development, so that only a few remain by the age of 50. 3. Thus, eggs ovulated near the age of 50 are 30-40 years older than those ovulated just after puberty. 4. This ageing of eggs can cause defects in the children born to older women. A.II (B) Answer the following : (Any Two) (i) 1. Corrosion of metals can be prevented if the contact between metal and air is cut off. This is done in a number of ways. Some of the methods are given below : (a) Corrosion can be prevented if the metal is coated with something which does not allow moisture and oxygen to react with it. (b) Coating of metals with paint, oil, grease or varnish prevents the corrosion of metals e.g rusting of iron can be prevented by this method. (c) Coating of corrosive metals with non corrosive metals also prevents corrosion. Some of the methods by which metals can be coated with non-corrosive metals are: 2. Galvanizing : It is process of giving a thin coating of zinc on iron or steel to protect them from corrosion. E.g shiny iron nails, pins extra.
  9. 9. Paper - 5 2 2 ... 7 ... 3. Tinning : It is the process of giving a coating of tin, i.e., molten tin over other metal. Eg. : Cooking vessels, made of copper and brass get a greenish coating due to corrosion. This greenish coating is poisonous. Therefore they are given a coating of tin to prevent corrosion. (Kalhai) 4. Electroplating : In this method a metal is covered with another metal using electrolysis. Silver-plated spoons, gold-plated jewellery, etc, are electroplated. 5. Anodizing : In this method metals like copper and aluminum are electrically coated with a thin strong film of their oxides. This film protects the metals from corrosion. 6. Alloying : An alloy is an homogenous mixture of two or more metals or a metal and a non-metal in definite proportion. The resultant metals called alloys do not corrode easily, e.g. stainless steel. Name of Alloy , constuent elements. (a) Brass (copper and zinc) (b) Bronze (copper and tin) (c) Stainless steel (iron, nickel and chromium) If one of the metal is mercury, then the alloy is known as an amalgam. (ii) 1. Calcium reacts with cold water to form calcium hydroxide and hydrogen gas. Ca(s) + 2H2O(l)  Ca(OH)2(aq) + H2(g) Calcium Water Calcium hydroxide Hydrogen 2. The heat produced is less which is not sufficient to burn the hydrogen gas. The piece of calcium metal starts floating in water as bubbles of hydrogen gas formed during the reaction stick to its surface. This reaction is less violent. (iii) Metals and Non-metals. Metals 1. State : Metals are generally solids at room temperature. Exception: Mercury and gallium are liquid at room temperature. 2. Hardness : Metals are generally hard. Exceptions : Sodium and Potassium can be cut with a knife. Non-metals 1. State : Non-metals are generally solids or gases. Exception: Bromine is the only non-metal in liquid state. 2. Hardness : Non-metals are generally soft. Exceptions : Carbon in the form of diamond is the hardest naturally occurring substance.
  10. 10. Paper - 5 2 ... 8 ... (iv) 1. There is a strong relation between high national fertility rate and measures of poverty. 2. As the population density increases, decrease in per capita income and natural resources takes place. 3. General health also goes down. 4. It creates an economic burden on the nation. 5. Large families affect both the individual as well as the community life. 6. Economic pressure, mother’s poor health, children neglected at home, poor housing, malnutrition, insufficient medical care, Metals 3. Lustre : Metals in their pure state have a brilliant shine called as metallic lustre. 4. Density : Metals generally have high density. Exceptions : Sodium and Potassium have density less than water. 5. Malleability : Metals are generally malleable (can be beaten into sheets). 6. Ductility : Metals are ductile (Drawn or stretched into thin wires). Gold is the most ductile metal. 7. Metals are good conductors of heat and electricity. Silver is the best conductor of electricity and next in order is copper. 8. Metals are strong and tough, they have high tensile strength. 9. Metals are sonorous, they produce a ringing sound when struck. 10. Metals usually have high melting point and boiling point. Exception: Sodium and potassium have low melting point (98ºC and 64ºC). Non-metals 3. Lustre : Non-metals generally do not have lustre. Exceptions : Iodine crystals and diamond have lustre. 4. Density : Non-metals generally have low density. Exceptions : Diamond is as heavy as aluminium. 5. Malleability : Non-metals are non-malleable, if they are hammered they form powdery mass. So, they are brittle in nature. 6. Ductility : Non-metals are non-ductile. 7. Non-metals are in general bad conductors of electricity. Exceptions : Graphite is a good conductor of electricity. 8. Non-metals are not strong, they have low tensile strength. 9. Non - metals are not sonorous. 10. Non- metals have usually low melting piont or boiling point. Exception: Diamond has a high melting point (more than 3500ºC).
  11. 11. Paper - 5 2 2 2 ... 9 ... lack of better education are some of the disadvantages of large family size. (v) 1. Organisms such as hydra use regenerative cells for reproduction in the process of budding. 2. When hydra reaches maturity and is well fed, its body wall begins to form a rounded growth from the stalk of the adult. 3. This growth is called a bud which develops in time into a miniature hydra. 4. The body layers, body cavity and the digestive cavity of the young hydra are continuous with that of the parent hydra. The young hydra gets nourishment from the parent. 5. When the young hydra is sufficiently developed to take up an individual existence, the base of the new hydra seals off and thus allows the new individual to break off from the parent hydra. A.III Draw a neat and labelled diagram of the following : (Any One) (i) Longitudinal section of flower. (ii) Human male reproductive system. Stigma Style Ovary Carpel Petal Anther Filament Sepal Stamen Bladder Seminal vesicle Prostate gland Urethra Epididymis Testis Penis Vas deferens
  12. 12. Paper - 5 (iii) Spore formation in Mucor. A.IV Answer the following : (Any One) (i) The human female reproductive system consists of main reproductive organs like vagina, uterus, oviduct and ovaries. 1. Vagina : (a) It is a muscular tube that extends from the vaginal opening to the uterus. (b) It provides the route for the menstrual blood to leave the body during menstruation. (c) It is a pathway through which the sperms enter into the woman’s body and is a pathway through which a baby comes out of the woman’s body during childbirth. 2. Uterus : Uterus is a muscular organ. Due to strong muscles and ability to expand and contract, the uterus can accomodate a growing foetus and push the baby during labour. 3. Overies : Ovaries are two oval shaped organs that lie to the upper right and left of the uterus. They develop and release eggs into the oviduct. They secrete hormone oestrogen which brings about changes in girls during puberty. When a baby girl is born the ovaries already contain thousands of immature eggs which remain inactive till maturity. On reaching puberty, a woman’s ovaries usually release one egg each month. (ii) 1. Tallness is the dominant character and shortness is a recessive character of pea plant. 2. Similarly red colour of the flower is the dominant character and the white colour of the flower is the recessive character. 3. Therefore, the gene combinations for the characters will be TT (tallness), tt (shortness), RR (red flowers), rr (white flowers). ... 10 ... Rhizoids Hyphae Sporangium Spores 2 5 5
  13. 13. Paper - 5  ... 11 ... Cross between TtRr and TtRr : The phenotype and genotype is shown in the table below : The phenotypic ratio of F2 generation is 9 : 3 : 3 : 1 and the genotypic ratio is 1 : 2 : 2 : 4 : 1 : 1 : 2 : 2 : 1. Mendel’s dihybrid cross (formation of gametes) Gametes TTRR ttrrP1 generation F1 generation gametes TR TR tr tr TtRr TtRr TtRr TtRr TR TTRR TTRr TtRR TtRr tR TtRR TtRr ttRR ttRr tr TtRr Ttrr ttRr ttrr Tr TTRr TTrr TtRr Ttrr TR Tr tR tr Phenotype Tall with red flowers Short with red flowers Tall with white flowers Short with white flowers No. of squares in chequer board 9 3 3 1 No. of squares in chequer board 1 2 2 4 1 1 2 2 1 Genotype TTRR TTRr TtRR TtRr Ttrr ttRR ttRr Ttrr ttrr

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