SCIENCE AND TECHNOLOGY (ÁflôÊÊŸ fl ÊÒlÊappleÁª Ë) () Time : Hours ] [ Maximum Marks : 85 ÿ ÉÊá appleu ] [ ÍáÊÊZ 85 Instructions : () All questions are compulsory. () Marks are indicated against each question. ÁŸŒapple Ê () Ë Ÿ ÁŸflÊÿ Ò () àÿapple Ÿ apple apple Ê Ÿapple ÁŒ ªÿapple Ò. Which one of the following gases is essential for photosynthesis? Nitrogen Oxygen Argon Carbon-dioxide ÁŸêŸÁ Áπà apple apple ÊÒŸ Ë ªÒ Ê Ê apple áê apple Á Êfl ÿ Ò? ŸÊß UÊapple Ÿ ÊÚÄ Ë Ÿ ÊÚª Ÿ Ê Ÿ «UÊß ÊÚÄ Êß«U. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam? FeO Fe O 3 Fe 3 O Fe O 3 and Fe 3 O Êÿ UŸ ( Êapple Ê) ÃÕÊ Ê Ë apple ÿ à Á Á ÿê apple Êapple apple Ê ÁŸêŸÁ Áπà apple apple ÊÒŸ Ê/ ÊÒŸ apple ÊÚÄ Êß«U Ê# ÊappleªÊ/ Êapple ªapple? FeO Fe O 3 Fe 3 O Fe O 3 ÃÕÊ Fe 3 O 5/AS/--A ] 3!5/AS/--A! [ Contd...
3. Some resistors are connected in a circuit as shown in the following figure. The equivalent resistance in the circuit is : ŸËøapple ÁŒπÊ ª ÁøòÊ apple ŸÈ Ê U È U Áà UÊappleœ Á U Õ apple ÿêappleá à Á ª Ò Á U Õ apple Á UáÊÊ Ë Áà UÊappleœ ÊappleªÊ R 3R 7R 5R. The decomposers in an ecosystem : Convert inorganic material to simpler forms. Convert organic material into simpler forms. Convert inorganic materials into organic compounds. Do not breakdown organic compounds. Á Ë ÊÁ Uà òê apple ÉÊ U Ê ÁŸ ŒÊÕ Êapple U à U M apple Œ ŒappleÃapple Ò Òfl ŒÊÕ Êapple U à U M apple Œ ŒappleÃapple Ò Ê ÁŸ ŒÊÕÊappleZ Êapple Ê ÁŸ ÿêòáª Ê apple apple Œ ŒappleÃapple Ò Ê ÁŸ ÿêò᪠Êapple Ê ÉÊ UŸ Ÿ Ë UÃapple 5/AS/--A ]!5/AS/--A! [ Contd...
5. The numerical ratio of displacement to distance for a moving object is : always less than always equal to always more than equal or less than Á Ë ªÁà ʟ Á «U apple Á ÁflSÕÊ Ÿ ÃÕÊ ŒÍ UË Ê Ê Á ŸÈ Êà ÊappleÃÊ Ò ŒÒfl apple ŒÒfl apple UÊ U ŒÒfl apple Áœ apple UÊ U ÕflÊ 6. If a grasshopper is eaten by a frog, then the energy transfer will be from : producer to decomposer. producer to primary consumer. primary consumer to secondary consumer. secondary consumer to primary consumer. ÿᜠapple Á U«U«appleU Êapple πê Ê ÃÊapple Ê SÕÊŸÊ Ã UáÊ Ë ÁŒ ÊÊ ÊappleªË à ÊŒ apple ÉÊ U Ë Êapple U à ÊŒ apple ÊÕÁ ÊappleÄÃÊ Ë Êapple U ÊÕÁ ÊappleÄÃÊ apple ÁmÃËÿ ÊappleÄÃÊ Ë Êapple U ÁmÃËÿ ÊappleÄÃÊ apple ÊÕÁ ÊappleÄÃÊ Ë Êapple 7. Which of the following statement is correct? Conversion of solid into vapours without passing through the liquid state is called sublimation. Conversion of vapours into solid without passing through the liquid state is called vaporisation. Conversion of vapours into solids without passing through the liquid state is called freezing. Conversion of solid into liquid is called sublimation. ÁŸêŸÁ Áπà apple apple ÊÒŸ Ê ÕŸ Ë Ò? UÊapple Ê Œ fl flsõê apple ªÈ$ appleu Á ŸÊ flêc apple M Êãà UáÊ äfl Êß ÊÃÊ Ò flêc Ê Œ fl flsõê apple ªÈ$ appleu Á ŸÊ UÊapple apple M Êãà UáÊ flêc Ÿ ÊÃÊ Ò flêc Ê Œ fl flsõê apple ªÈ$ appleu Á ŸÊ UÊapple apple M Êãà UáÊ Á Ë UáÊ ÊÃÊ Ò UÊapple Ê Œ fl apple M Êãà UáÊ äfl Êß ÊÃÊ Ò 5/AS/--A ] 5!5/AS/--A! [ Contd...
8. Two chemical species X and Y combine together to form a product P which contains both X and Y. X+Y P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct? (i) (ii) (iii) (iv) P is a compound. X and Y are compounds. X and Y are elements P has a fixed composition. (i), (ii) and (iii) (i), (ii) and (iv) (ii), (iii) and (iv) (i), (iii) and (iv) ŒÊapple UÊ ÊÿÁŸ S Ë ÊË X ÃÕÊ Y Ê apple ÿèäã Êapple U à ÊŒ P ŸÊÃË Ò Á apple X ÃÕÊ Y ŒÊappleŸÊapple ÁSÕÃ Ò X+Y P X ÃÕÊ Y Êapple U UÊ ÊÿÁŸ Á Á ÿê mê UÊ U ŒÊÕÊappleZ apple Ÿ Ë ÃÊapple«Ê Ê ÃÊ Ò ÁŸêŸÁ Áπà apple apple ÊÒŸ apple ÕŸ X, Y ÃÕÊ P S Ë ÊË apple Œ apple àÿ Ò? (i) (ii) (iii) (iv) P ÿêòáª Ò X ÃÕÊ Y ÿêòáª Ò X ÃÕÊ Y Ãàfl Ò P Ê ÁŸÁ øã ÉÊ UŸ Ò (i), (ii) ÃÕÊ (iii) (i), (ii) ÃÕÊ (iv) (ii), (iii) ÃÕÊ (iv) (i), (iii) ÃÕÊ (iv) 5/AS/--A ] 6!5/AS/--A! [ Contd...
9. If the fossil of an organism is found in the deeper layers of earth, then we can predict that : The extinction of organism has occurred recently. The extinction of organism has occurred thousands of years ago. The fossil position in the layers of earth is not related to its time of extinction. Time of extinction cannot be determined. ÿᜠÁ Ë Ëfl Ê ËflÊ ÎâflË Ë ª UË ÃÊappleZ apple ÊåÃ È Ê Ò, à ÁflcÿflÊáÊË U Ãapple Ò Á Ëfl Ê Áfl Êapple Ê Ë apple È U fl ÊappleZ apple È Ê Ò Ëfl Ê Áfl Êapple $ Ê UÊapple fl ÊappleZ Ífl È Ê Ò ÎâflË Ë ÃÊappleZ apple ËflÊ Ë ÁSÕÁÃ Ê Ëfl apple Áfl Èåà ÊappleŸapple Ë flᜠapple Êappleß œ Ÿ Ë Ò Áfl Èåà ÊappleŸapple Ë fláœ Ê ÁŸœÊ UáÊ Ÿ Ë Á ÿê Ê ÃÊ 0. Find the derived SI unit for density and pressure. ÉÊŸàfl ÃÕÊ ŒÊ apple ÿèà ÛÊ SI ÊòÊ ôêêã ËÁ. Rewrite the following measurements without using SI prefixes : (i) pm (ii) Gm (iii) nm (iv) 0 Tm ÁŸêŸÁ ÁπÃ Ê Êapple Êapple SI Ífl ÇŸ Ê ßSÃapple Ê Á ªÒ U ÈŸ Á Áπ (i) pm (ii) Gm (iii) nm (iv) 0 Tm. State two advantages and two disadvantages of using fossil fuels as sources of energy. Ê dêappleã apple M apple ËflÊ ßZœŸÊapple Ê ÿêappleª UŸapple apple ŒÊapple Ê ÃÕÊ ŒÊapple ÊÁŸÿÊapple Êapple ÃÊß 5/AS/--A ] 7!5/AS/--A! [ Contd...
3. How much heat is required to raise the temperature of 5g of mercury from 0 C to 00 C? (Specific heat capacity of mercury= 0.38 0 3 J/kg C) 5g Ê appleu ( UË) Ê ÃÊ 0 C apple 00 C à ʟapple apple Á Á ÃŸË c Ê Ë Êfl ÿ ÃÊ ÊappleªË? ( Ê appleu ( UË) Ë ÁflÁ Êc U c Ê œêá UÃÊ = 0.38 0 3 J/kg C). State Newton s law of gravitation. How does the force of gravitation between two objects change when the distance between them is reduced to half? ãÿí UŸ Ê ªÈL àflê áê Ê ÁŸÿ ÃÊß ÿᜠŒÊapple flsãè Êapple apple Ëø Ë ŒÍ UË Êappleapple ÊœÊ U ÁŒÿÊ Ê ÃÊapple Ÿ apple Ëø ªÈL àflê áê Á Ê U Œ appleªê? 5. Give examples of any two major water pollutants and mention their sources. Á ã Ë ŒÊapple ÈÅÿ ŒÍ Êapple apple ŒÊ UáÊ ŒËÁ ÊÒ U Ÿ apple dêappleã ÃÊß 6. What is the difference between molecular mass and molar mass? Calculate the mass of 0.5 mole of N gas. (Atomic mass of N=u) ÊÁáfl Œ ÿ ÊŸ ÊÒ U Êapple U Œ ÿ ÊŸ apple ÄÿÊ ãã U Ò? 0.5 Êapple N ªÒ apple Œ ÿ ÊŸ Ë ªáÊŸÊ ËÁ (N Ê U ÊáÊÈ Œ ÿ ÊŸ=u) 7. Abida went to Kashmir during a winter season. She observed that the fish and other aquatic animals living in the Dal lake do not die even during severe winter, though the surface water of the lake was frozen. She was curious to know the reason behind this. Can you explain her why aquatic animals living in water bodies of very cold regions do not die in severe winter? ÊÁ ŒÊ ŒË apple ÊÒ apple Ë U ªß Ÿapple ŒappleπÊ Á ÿlá àÿᜠŒË apple «U ÊË Ë Ã Ê ÊŸË ªÿÊ ÕÊ, Á» U Ë ÊË apple U Ÿapple flê Ë UÁ ÿê ÊÒ U ŒÍ appleu Ëÿ ããè Ÿ Ë UÃapple fl ß Ê Ê UáÊ ÊŸŸapple apple Á à È ÕË ÄÿÊ Ê apple ÊÊ Ãapple Ò Á Ëÿ ÁŸ ÊÿÊapple apple U Ÿapple flê apple Ëÿ ããè àÿ à Uá«U apple ÊÒ apple ÄÿÊapple Ÿ Ë UÃapple? 5/AS/--A ] 8!5/AS/--A! [ Contd...
8. Giving structure of diamond and graphite compare their electrical conductivity and softness. Ë appleu ÊÒ U ª apple» Êß U Ë UøŸÊ ŒappleÃapple È Ÿ Ë ÁfllÈà øê ÃÊ ÃÕÊ Êapple ÃÊ Ë ÃÈ ŸÊ ËÁ 9. Define work. State the relation between work, force and displacement. Prove that the increase in the kinetic energy of a body is equal to the work done by the force acting on the body. Êÿ Êapple Á U ÊÁ à ËÁ Êÿ, ÃÕÊ ÁflSÕÊ Ÿ apple œ ÃÊß Á h ËÁ Á Á «U Ë ªÁÃ Ê apple flîáh Á «U U ªŸapple flê apple mê UÊ Á ª Êÿ apple UÊ U ÊappleÃË Ò 0. What is meant by inertia? Describe an activity to show the property of inertia. Why do the passengers standing in a bus fall in the backward direction when the stationary bus begins to move suddenly? «àfl apple ÄÿÊ Á Êÿ Ò? «àfl apple ªÈáÊ Êapple Œ ÊÊ Ÿapple apple Á Á ÿê Ê Ê fláê Ÿ ËÁ L Ë Èß apple π«apple ÿêòêë øêÿ ø Ÿapple U Ë appleu Ë Êapple ÄÿÊapple Áª U ÊÃapple Ò?. State any four factors that should be kept in mind for rearing hens for better production of eggs and broilers. È Ä È U Ê Ÿ apple, «UÊapple ÃÕÊ ÊÒÿ U apple ë appleu à ÊŒŸ apple Á äÿêÿ ŒappleŸapple ÿêappleçÿ Á ã Ë øê U Ê U Êapple Êapple ÃÊß. Mention direct and indirect methods of transmission of communicable diseases. Ê UÊappleªÊapple apple áê Ë àÿˇê ÃÕÊ àÿˇê ÁflÁœÿÊapple Ê À appleπ ËÁ 5/AS/--A ] 9!5/AS/--A! [ Contd...
3. What is a balanced chemical equation? Explain the significance of a balanced chemical equation. Balance the following chemical equations : (i) (ii) C H 5 OH+O CO +H O+Heat H S+O S+H O (iii) Al+HCl AlCl 3 +H ÃÈÁ à UÊ ÊÿÁŸ Ë UáÊ ÄÿÊ Ò? ÃÈÁ à UÊ ÊÿÁŸ Ë UáÊ apple àfl Ë ÿêåÿê ËÁ ÁŸêŸÁ Áπà UÊ ÊÿÁŸ Ë UáÊÊapple Êapple ÃÈÁ à ËÁ (i) (ii) C H 5 OH+O CO +H O+ c Ê H S+O S+H O (iii) Al+HCl AlCl 3 +H. How does the atomic size vary as we move from (i) left to right in a period and (ii) top to bottom in a group? Give reasons for these variations. Á Ë (i) Êflà apple Êÿapple apple ŒÊÿapple ÊÒ U (ii) Í apple U apple ŸËøapple, Ë Êapple U ÊÃapple Ò ÃÊapple U ÊáÊÈ apple Êß$ ( Ê Ê U) apple ÄÿÊ Á Uflà Ÿ ÊappleÃapple Ò? ߟ Á Uflà ŸÊapple Ê Ê UáÊ ÃÊß 5. Describe the model of atom as proposed by Thomson. In what way is this model different from that of Rutherford s atomic model? ÕÊ Ÿ mê UÊ SÃÊÁflà U ÊáÊÈ apple ÊÚ«U Ê fláê Ÿ ËÁ ÿ ÊÚ«U UŒ U» Êapple«U apple U ÊáÊÈ ÊÚ«U apple Á Ê U Á ãÿ Ò? 6. Explain the two types of cell division. Give significance of Meiosis. ÊappleÁ Ê Ê Áfl Ê Ÿ apple ŒÊapple Ê UÊapple Ë ÿêåÿê ËÁ œ ÍòÊË Áfl Ê Ÿ (Á ÿêappleá ) Ê àfl ŒËÁ 7. What is meant by colour blindness? On which kind of chromosome or autosome are defective genes causing colour blindness located? Why is colour blindness found mostly in boys. UªÊ œãê apple ÄÿÊ Á Êÿ Ò? UªÊ œãê à ÛÊ UŸapple flê apple ŒÊapple ÍáÊ ËŸ ÊÒŸ apple ªÈáÊ ÍòÊ ÕflÊ Á ª ªÈáÊ ÍòÊ U ÁSÕà ÊappleÃapple Ò? UªÊ œãê ïÿêœêã U «Êapple apple Ë ÄÿÊapple Êß ÊÃË Ò? 5/AS/--A ] 0!5/AS/--A! [ Contd...
8. Describe the ph scale. Give any four examples to show the importance of ph in our everyday life. ph S apple Ê fláê Ÿ ËÁ Ê appleu ŒÒÁŸ ËflŸ apple ph Ê àfl Œ ÊÊ Ÿapple apple Á Êappleß øê U ŒÊ UáÊ ŒËÁ 6 9. Identify the device used as a spherical mirror or lens in the following two cases, when the image formed is enlarged, virtual and erect in both the cases. 6 (a) (b) Object is placed between device and its focus, image formed is behind it. Object is placed between device and its focus, image formed is on the same side as that of the object. Also, draw ray diagrams to show the formation of image in each case. An object is placed at a distance of 0 cm from a convex mirror of radius of curvature 30 cm. Find the position and nature of the image. ÁŸêŸÁ Áπà ÁSÕÁÃÿÊapple apple ªÊapple Ëÿ Œ áê ÕflÊ apple apple M apple ÿèáäã Ë øêÿ ËÁ Á àÿapple ÁSÕÁà apple ÊflÁœ Ã, Ê Ê Ë fl ËœÊ ÁÃÁ ŸÃÊ Ò (a) (b) Á ÿèáäã ÊÒ U ß apple» Êapple apple Ëø Ò ÃÕÊ ÁÃÁ ß apple Ë appleu ŸÃÊ Ò Á ÿèáäã ÊÒ U ß apple» Êapple apple Ëø Ò ÃÕÊ ÁÃÁ Ë Êapple U ŸÃÊ Ò Á Êapple Á ÁSÕÃ Ò U àÿapple ÁSÕÁà apple ÁÃÁ ŸŸapple Êapple Œ ÊÊ Ÿapple apple Á Á UáÊ Ê appleuπ πë Áø 30 cm fl ÃÊ ÁòÊíÿÊ apple Á Ë ûê Œ áê apple Êappleß Á 0 cm ŒÍ UË U UπÊ Ò ÁÃÁ Ë ÁSÕÁà ÃÕÊ Î Áà ôêêã ËÁ 30. Explain the process of digestion of carbohydrates, proteins and fats in human beings. ÊŸflÊapple apple Ê Êapple Êß«appleU U, Êapple UËŸ ÃÕÊ fl Ê apple ÊøŸ Ë Á ÿê Ë ÿêåÿê ËÁ 6 - o O o - 5/AS/--A ]!5/AS/--A! [ Contd...