212 55_OS_2 Set A Science and Technology Final.pmd

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1 This Question Paper consists of 30 questions and 8 printed pages. ß Ÿ- òê apple 30 Ÿ ÃÕÊ 8 ÈÁŒ à Îc U Ò Roll No. ŸÈ Ê Code No. Êapple«U Ÿ.55/OS/2 SCIENCE AND TECHNOLOGY (ÁflôÊÊŸ fl ÊÒlÊappleÁª Ë) (22) Set A Day and Date of Examination UˡÊÊ Ê ÁŒŸ fl ÁŒŸÊ Signature of Invigilators. ÁŸ UËˇÊ Êapple apple SÃÊˇÊ U 2. General Instructions :. Candidate must write his/her Roll Number on the first page of the Question Paper. 2. Please check the Question Paper to verify that the total pages and the total number of questions contained in the Question Paper are the same as those printed on the top of the first page. Also check to see that the questions are in sequential order. 3. For the objective type of questions, you have to choose any one of the four alternatives given in the question i.e. (A), (B), (C) or (D) and indicate your correct answer in the Answer-Book given to you.. All the questions including objective type questions are to be answered within the allotted time and no separate time limit is fixed for answering objective type questions. 5. Making any identification mark in the Answer-Book or writing Roll Number anywhere other than the specified places will lead to disqualification of the candidate. 6. Write your Question Paper code No. 55/OS/2-A on the Answer-Book. 7. (a) The Question Paper is in English/Hindi medium only. However, if you wish, you can answer in any one of the languages listed below : English, Hindi, Urdu, Punjabi, Bengali, Tamil, Malayalam, Kannada, Telugu, Marathi, Oriya, Gujarati, Konkani, Manipuri, Assamese, Nepali, Kashmiri, Sanskrit and Sindhi. You are required to indicate the language you have chosen to answer in the box provided in the Answer-Book. (b) If you choose to write the answer in the language other than Hindi and English, the responsibility for any errors/mistakes in understanding the question will be yours only.!55/os/2-22-a! [ Contd...

2 Ê Êãÿ ŸÈŒapple Ê. UˡÊÊÕË Ÿ òê apple apple Îc U U ŸÊ ŸÈ Ê fl ÿu Á πapple 2. Î ÿê Ÿ òê Êapple ÊÚ ø apple Á Ÿ òê apple È Îc UÊapple ÃÕÊ ŸÊapple Ë ÃŸË Ë ÅUÿÊ Ò Á ÃŸË Õ Îc apple apple U U Ë Ò ß ÊÃ Ë ÊÚ ø Ë U apple Á Ÿ Á UM apple Ò 3. flsãèáÿc U ŸÊapple apple Ê Êapple øê U Áfl À Êapple (A), (B), (C) ÃÕÊ (D) apple apple Êappleß ûê øèÿÿê Ò ÃÕÊ ŒË ªß ûê U- ÈÁSUÃ Ê apple Ê Ë ûê Á Áπ U. flsãèáÿc U ŸÊapple apple ÊÕ- ÊÕ Ë ŸÊapple apple ûê ÁŸœÊ Á Uà flᜠapple Ëà U Ë ŒappleŸapple Ò flsãèáÿc U ŸÊapple apple Á ª apple ÿ Ÿ Ë ÁŒÿÊ Ê ªÊ 5. ûê U- ÈÁSUÃ Ê apple øêÿ-áøq ŸÊŸapple ÕflÊ ÁŸÁŒ c U SÕÊŸÊapple apple ÁÃÁ UÄÃ Ë Ë ŸÈ Ê Á πÿapple U UˡÊÊÕË Êapple ÿêappleçÿ U UÊÿÊ Ê ªÊ 6. ŸË ûê U- ÈÁSUÃ Ê U Ÿ òê Ë Êapple«U ÅÿÊ 55/OS/2-A Á πapple 7. ( ) Ÿ òê apple fl Á ŒË/ ª apple Ë apple Ò Á» U Ë, ÿáœ Ê øê apple ÃÊapple ŸËøapple ŒË ªß Á Ë Ê Ê apple ûê Œapple Ãapple Ò ª apple Ë, Á ŒË, ŒÍ, Ê Ë, ª Ê, ÃÁ, ÿê, ãÿ«, Ãapple ȪÈ, UÊ UË, Á«ÿÊ, ªÈ UÊÃË, Êapple áêë, ÁáÊ È UË, Á ÿê, Ÿapple Ê Ë, Ë UË, S Î Ã ÊÒ U Á œë Î ÿê ûê U- ÈÁSÃ Ê apple ÁŒ ª ÊÚÄ apple Á πapple Á Ê Á Ê Ê apple ûê U Á π U apple Ò (π) ÿáœ Ê Á ŒË fl ª apple Ë apple ÁÃÁ UÄà Á Ë ãÿ Ê Ê apple ûê U Á πãapple Ò ÃÊapple Ÿ Êapple ÊŸapple apple ÊappleŸapple flê Ë òêèá UÿÊapple /ª ÁÃÿÊapple Ë Á ê appleuœê Ë apple fl Ê Ë ÊappleªË 2!55/OS/2-22-A! [ Contd...

3 SCIENCE AND TECHNOLOGY (ÁflôÊÊŸ fl ÊÒlÊappleÁª Ë) (22) Time : 2 2 Hours ] [ Maximum Marks : 85 ÿ 2 2 ÉÊá appleu ] [ ÍáÊÊZ 85 Note : () All questions are compulsory. (2) Marks are indicated against each question. ÁŸŒapple Ê () Ë Ÿ ÁŸflÊÿ Ò (2) àÿapple Ÿ apple apple Ê Ÿapple ÁŒ ª Ò. The SI unit of luminous intensity is : (A) Candela (B) Mole (C) Kelvin (D) Ampere íÿêappleáã ÃËfl ÃÊ Ê SI ÊòÊ Ò (A) Ò á«appleu Ê (B) Êapple (C) apple ÁÀflŸ (D) appleáê ÿ U 2. For uniformly accelerated motion : (A) v 2 =u 2 +2as (B) u 2 =v 2 +2as (C) v=u+2as (D) u=v+2as ÊŸ àflá Uà ªÁà apple Á (A) v 2 =u 2 +2as (B) u 2 =v 2 +2as (C) v=u+2as (D) u=v+2as 3. Longitudinal waves can travel through : (A) gas only (B) liquid only (C) solid only (D) all the three ŸÈŒÒÉÿ à UªÊapple Ê ª Ÿ Êapple ÃÊ Ò (A) apple fl ªÒ apple (B) apple fl Œ fl apple (C) apple fl UÊapple apple (D) ÃËŸÊapple apple. Which of the following is not a heterotroph? (A) Bed bug (B) Frogs (C) Bread mould (D) Algae ÁŸêŸÁ Áπà apple apple ÊÒŸ Áfl Êapple Ë Ÿ Ë Ò? (A) π U (B) apple (C) apple «U»» Í Œ (D) ÊÒflÊ ( appleàªë) 3!55/OS/2-22-A! [ Contd...

4 5. Which of the following is a property of non-metals? (A) They are electropositive elements (B) Their hydrides are generally unstable (C) They form acidic oxides (D) They are generally hard solids ÁŸêŸÁ Áπà apple apple ÊÒŸ- Ê œêãè Êapple Ê ªÈáÊœ Ò? (A) ÿapple œÿáfllèãë Ãàfl ÊappleÃapple Ò (B) ߟ apple Êß«UÊß«U Ê Êãÿà ÁSÕ U ÊappleÃapple Ò (C) ÿapple ê Ëÿ ÊÚÄ Êß«U ŸÊÃapple Ò (D) ÿapple Ê Êãÿà UÊapple U UÊapple ÊappleÃapple Ò 6. A water tanker carries 0 hl water to a colony for distribution. Each person is given 0 L water. How many persons will get water? (A) 0 (B) 00 (C) 000 (D) 0000 Êappleß Ò U U 0 hl ÊŸË Ê ÊappleŸË apple Ê UŸapple apple Á apple ÊÃÊ Ò àÿapple ÿáäã Êapple 0 L ÊŸË ÁŒÿÊ ÊÃÊ Ò Á ßapple ÿáäãÿêapple Êapple ÊŸË Á appleªê? (A) 0 (B) 00 (C) 000 (D) Which of the following statements comprising Dalton s Atomic Theory is true even today? (A) Matter consists of indivisible atoms. (B) All the atoms of a given chemical element are identical in mass and all other properties. (C) Atoms are indestructible. (D) Atoms retain their identity in chemical reactions. «UÊÀ UŸ apple U ÊáÊÈ Á hê Ã Ê ÊÒŸ- Ê ÕŸ Ê Ë àÿ Ò? (A) ŒÊÕ Áfl Êíÿ U ÊáÊÈ Êapple apple ŸÊ ÊappleÃÊ Ò (B) Á Ë Ãàfl apple Ë U ÊáÊÈ Œ ÿ ÊŸ ÊÒ U ãÿ Ë ªÈáÊœ ÊappleZ apple Ò apple ÊappleÃapple Ò (C) U ÊáÊÈ ÁflŸÊ ÊË ÊappleÃapple Ò (D) UÊ ÊÿÁŸ Á Á ÿê Êapple apple U ÊáÊÈ ŸË øêÿ ŸÊ UπÃapple Ò 8. Which of the following statements about U is not true? (A) The number of electrons in an atom of U is 92. (B) The number of neutrons in an atom of U is 238. (C) The mass number of U is 238. (D) The number of protons in an atom of U is 92 ÁŸêŸÁ Áπà apple apple ÊÒŸ- Ê ÕŸ U apple Áfl ÿ apple Ë Ÿ Ë Ò? (A) U apple U ÊáÊÈ apple ß appleä UÊÚŸÊapple Ë ÅÿÊ 92 Ò (B) U apple U ÊáÊÈ apple ãÿí UÊÚŸÊapple Ë ÅÿÊ 238 Ò (C) U Ë Œ ÿ ÊŸ ÅÿÊ 238 Ò (D) U apple U ÊáÊÈ apple Êapple UÊŸÊapple Ë ÅÿÊ 92 Ò!55/OS/2-22-A! [ Contd...

5 9. Molecular mass (in u) of a member of a particular homologous series is 56. Which of the following cannot be the molecular mass of a member of this series? (A) 28 (B) 2 (C) (D) 0 Á Ë ÊÃËÿ üêappleáêë apple ŒSÿ Ê ÊÁáfl Œ ÿ ÊŸ (u apple ) 56 Ò ÁŸêŸÁ Áπà apple apple ÊÒŸ- Ê ß üêappleáêë apple ŒSÿ Ê ÊÁáfl Œ ÿ ÊŸ Ÿ Ë Êapple ÃÊ Ò? (A) 28 (B) 2 (C) (D) 0 0. Give the name and symbol of prefix used in SI units for the following multiple/submultiple. (a) 0 2 (b) 0 2 SI ÊòÊ Êapple apple ÁŸêŸÁ Áπà flàÿ / flã Êapple apple Á ÿèäã Ífl ÇŸÊapple apple ŸÊ ÊÒ U ÃË Á Áπ (a) 0 2 (b) Name the device or gadget which converts : 2 (a) Sound energy into electrical energy (b) Electrical energy into heat energy (c) Light energy into electrical energy (d) Chemical energy into electrical energy ÿèáäã ÕflÊ UáÊ Ê ŸÊ Á Áπ Êapple Œ ÃË Ò (a) äfláÿ Ê Êapple ÁfllÈÃ Ê apple (b) ÁfllÈÃ Ê Êapple c Ëÿ Ê apple (c) Ê Ê Ê Êapple ÁfllÈÃ Ê apple (d) UÊ ÊÿÁŸ Ê Êapple ÁfllÈÃ Ê apple 2. Define specific heat capacity. Give its SI unit. 2 ÁflÁ Êc U c Ê œêá UÃÊ Êapple Á U ÊÁ à ËÁ ÊÒ U ß Ê SI ÊòÊ ŒËÁ 3. Balance the following chemical equations : 2 (a) MnO 2 +HCl MnCl 2 +H 2 O+Cl 2 (b) Pb(NO 3 ) 2 PbO+NO 2 +O 2 ÁŸêŸÁ Áπà UÊ ÊÿÁŸ Ë UáÊÊapple Êapple ããèá à ËÁ (a) MnO 2 +HCl MnCl 2 +H 2 O+Cl 2 (b) Pb(NO 3 ) 2 PbO+NO 2 +O 2. Mass of an object is constant at all places but its weight varies from place to place. Explain. Á Ë flsãè Ê Œ ÿ ÊŸ Ë SÕÊŸÊapple U ÁSÕ U U ÃÊ Ò UãÃÈ Ê Ê U SÕÊŸ apple ŒÍ appleu SÕÊŸ U Á UflÁà à Êapple ÊÃÊ Ò ÿêåÿê ËÁ 2 5. Identify the kingdom to which each of the following belongs. 2 (a) Amoeba (b) Yeast (c) Bacteria (d) Ferns ÁŸêŸÁ Áπà Á ªÃ apple ŒSÿ Ò, Ë øêÿ ËÁ (a) Ë Ê (b) ÿës U (c) ÒÄ UËÁ UÿÊ (d) $» Ÿ 5!55/OS/2-22-A! [ Contd...

6 6. Draw a diagram of a flower and label : 2 (a) stigma and (b) stamen in it Èc Ê ÁøòÊ ŸÊß ÊÒ U apple (a) fláã ʪ ÊÒ U (b) È apple U Êapple Á à ËÁ 7. Identify the component of air without which life is not possible. Write its any two industrial uses and one harmful effect. flêÿè apple ÉÊ U Ë øêÿ ËÁ Á apple Á ŸÊ ËflŸ fl Ÿ Ë Ò ß apple ŒÊapple ÊÒlÊappleÁª ÿêappleª ÊÒ U ÊÁŸ Ê U Êfl Á Áπ 8. What is agricultural biotechnology? Explain (a) tissue or cellular culture and (b) genetic engineering. Write one use of each. Î Á Òfl ÊÒlÊappleÁª Ë ÄÿÊ Ò? (a) à ÿê ÊappleÁ Ê Ê flœ Ÿ ÊÒ U (b) ÊŸÈflÊ Á Ê Á ÿê ÁòÊ Ë Ë ÿêåÿê ËÁ àÿapple Ê - ÿêappleª Á Áπ 9. How does modern periodic law differ from Mendeleev s periodic law? Explain any two defects of Mendeleev s periodic table which were overcome in the modern periodic table. ÊœÈÁŸ Êflà -ÁŸÿ, appleã«appleu Ëfl apple Êflà -ÁŸÿ apple Á Ê U Á ÛÊ Ò? appleã«appleu Ëfl Ë ÊflÃ Ê UáÊË apple Á ã Ë ŒÊapple ŒÊapple Êapple Ë ÿêåÿê ËÁ Á Ÿ Ê ÊœÈÁŸ ÊflÃ Ê UáÊË apple ÁŸŒÊŸ Êapple ªÿÊ Ò 20. Write any two point of difference in the properties of ionic and covalent compounds. Write two examples of each. ÊÿÁŸ ÊÒ U ÿêapple Ë ÿêò᪠Êapple apple ªÈáÊœ ÊappleZ apple Êappleß ŒÊapple ãã U Á Áπ àÿapple apple ŒÊapple-ŒÊapple ŒÊ UáÊ Á Áπ 2. What is meant by the term momentum? Give its SI unit. Is it a scalar or a vector quantity. A force of 68 N acts on a body and produces an acceleration of.7 ms 2. Find the mass of the body. flappleª Ê ÄÿÊ Á Êÿ Ò? ß Ê SI ÊòÊ ÃÊß ÄÿÊ ÿ ÁŒ Ê ÕflÊ ÁŒ Ê UÊÁ Ê Ò? 68 N Á Ë flsãè U Êÿ UÃÊ Ò ÊÒ U apple.7 ms 2 Ê àfl UáÊ à ÛÊ UÃÊ Ò flsãè Ê Œ ÿ ÊŸ ôêêã ËÁ 22. Name the functional group which is present in carboxylic acids. Write its chemical formula. What is the formula and IUPAC name of the carboxylic acid present in vinegar? How is it obtained? Write the reaction involved. Ê Êapple ÁÄ Á ê Êapple apple ÁSÕà Á ˇÊ Ëÿ Í Ê ŸÊ Á Áπ ß Ê UÊ ÊÿÁŸ ÍòÊ Á Áπ Á U apple apple ÁSÕÃ Ê Êapple ÁÄ Á ê Ê ÍòÊ fl Êß.ÿÍ. Ë.. Ë. ŸÊ ÄÿÊ Ò? ÿ Ò apple ŸÊÿÊ ÊÃÊ Ò? h Á Á ÿê Á Áπ 6!55/OS/2-22-A! [ Contd...

7 23. What is eutrophication? Give sequence of events that results in the death of aquatic animals? È Êapple áê ÄÿÊ Ò? Ÿ ÉÊ UŸÊ Êapple apple Êapple ÃÊß Á apple Á UáÊÊ SflM Ëÿ ÊáÊË UŸapple ªÃapple Ò 2. How will you separate the components of a mixture of four substances A, B, C and D? Give various steps involved. Given that : (a) A is a solid and soluble in liquid B. (b) C and D are liquids which are miscible with each other and have widely different boiling points (c) Liquid B is immiscible with liquids C and D both. øê U ŒÊÕÊappleZ A, B, C ÊÒ U D apple Á üêáê apple ÉÊ U Êapple Êapple Ê Ò apple ÎÕ apple Uªapple? h ŒÊapple Êapple ŒËÁ ÁŒÿÊ ªÿÊ Ò Á (a) A UÊapple Ò Êapple Œ fl B apple ÉÊÈ Ÿ ÊË Ò (b) C ÊÒ U D Œ fl Ò Êapple US U Á üêáêëÿ Ò ÊÒ U Ÿ apple ÄflÕŸÊ Êapple apple Èà Áœ ãã U Ò (c) Œ fl B ŒÊappleŸÊapple Œ flêapple C ÊÒ U D apple ÊÕ Á üêáêëÿ Ò 25. Explain the role of the given adaptive feature in each of following cases : (a) Lotus has a long, slender and spongy stem. (b) Many desert reptiles excrete urine in the form of insoluble uric acid. (c) Penguins have a thick layer of densely packed feathers. (d) Eyes of aquatic animals are positioned on top of the head. ÁŸêŸÁ Áπà àÿapple UáÊÊapple apple ÁŒ ª ŸÈ Í Ÿ ˇÊáÊÊapple Ë ÍÁ Ê Ë ÿêåÿê ËÁ (a) Ê ÃŸÊ Ê, Ã Ê ÊÒ U S Ë ÊappleÃÊ Ò (b) Èà apple L SÕ Ëÿ UË Î ÍòÊ Êapple ÿíá U Á «U apple ÉÊÈ Ÿ ÊË M apple à Á à UÃapple Ò (c) apple ªÈߟ apple ÉÊŸapple Á ë U Ë Êapple UË Uà ÊappleÃË Ò (d) Ëÿ ÊÁáÊÿÊapple Ë Ê πapple Á U apple U ÊappleÃË Ò 26. Draw a labelled ray diagram for image formation by a concave mirror when the object is kept between C and F. Give the following characteristics of the image formed : (a) location (b) real or virtual (c) inverted or erect and (d) enlarged or diminished Á Ë flã Œ áê mê UÊ ÁÃÁ ê ŸŸapple apple Á ŸÊ Ê Á à Á UáÊ Ê appleuπ ŸÊß flsãè C ÊÒ U F apple Ëø apple ÁSÕà Êapple Ÿapple È ÁÃÁ ê apple ÁŸêŸ ˇÊáÊ ÃÊß (a) ÁSÕÁÃ, (b) flêsãáfl ÕflÊ Ê Ê Ë, (c) À UÊ ÕflÊ ËœÊ ÊÒ U (d) ÁflflÁœ à ( «Ê) ÕflÊ UÊapple UÊ 7!55/OS/2-22-A! [ Contd...

8 27. Draw diagram of a synapse and label the following in it : (a) Synaptic vesicle (b) Synaptic cleft (c) Synaptic bulb (d) Mitochondrion ê ÕŸ (Á ŸÒå ) Ê ÁøòÊ πë Áø ÊÒ U apple ÁŸêŸÁ Áπà Êapple Á à ËÁ (a) Á ŸÒÁå U Ê Êÿ (b) Á ŸÒÁå U ÁflŒ U (c) Á ŸÒÁå U À (d) Êß UÊapple Ê Á«UÿÊ 28. What is meant by nuclear fission? How does nuclear fission of uranium-235 result in a chain reaction? Write two advantages of nuclear energy. What is the hazard associated with the spent nuclear fuel? ŸÊÁ Ëÿ Áflπ «UŸ Ê ÄÿÊ Õ Ò? ÿí appleuáÿÿ apple ŸÊÁ Ëÿ Áflπ «UŸ Ê Á UáÊÊ oî π Ê Á Á ÿê apple Ò apple Êapple ÊÃÊ Ò? ŸÊÁ Ëÿ Ê apple ŒÊapple ÿêappleª ŒËÁ ÿêappleª Êapple øè apple ŸÊÁ Ëÿ ßZœŸ apple ÄÿÊ πã UÊ È«Ê È Ê Ò? Identify the substance that is used for (a) making baking powder and (b) in soda acid fire extinguisher. Write its chemical formula. Name the process that is used for its manufacture. Which raw materials (names and chemical formulae) are used in this method? Describe the process and write the chemical reactions involved. ŒÊÕ Ë øêÿ ËÁ Êapple ÿèäã ÊappleÃÊ Ò (a) appleá ª Ê «U U ŸÊŸapple apple Á ÃÕÊ (b) Êapple«UÊ- ê ÁÇŸ ÊÊ Êapple apple ß Ê ÍòÊ Á Áπ Ê ŸÊ Á Áπ Á apple mê UÊ ß Ê à ÊŒŸ ÊappleÃÊ Ò ß ÁflÁœ apple ÊÒŸ- apple ìêapple ŒÊÕ (ŸÊ ÃÕÊ UÊ ÊÿÁŸ ÍòÊ) ÿèäã ÊappleÃapple Ò? Ê fláê Ÿ ËÁ ÊÒ U h UÊ ÊÿÁŸ Á Á ÿê Á Áπ 30. Why are chromatids formed prior to a cell division? Mention the steps involved in DNA replication. Illustrate the process of replication with the help of a diagram. ÊappleÁ Ê Ê Áfl Ê Ÿ apple apple Êapple appleá U«U ÄÿÊapple ŸÃapple Ò? «UË. Ÿ.. Áà ΠÁà apple h ø UáÊÊapple Ê À appleπ ËÁ ÁøòÊ Ë ÊÿÃÊ apple Áà ΠÁà apple Êapple Œ ÊÊ ß o O o - 8!55/OS/2-22-A! [ Contd...