Ramakrishna Senior Secondary School e-question Bank (Half-Yearly) Class X Subject- Science

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1 Ramakrishna Senior Secondary School e-question Bank (Half-Yearly) Class X Subject- Science One Mark Ch:13 Magnetic effects of electric current 1. Why are slip rings used in a generator? 2. When a magnet is moved into the coil of wire as shown, there is small reading in the ammeter. How can we increase the reading? 3. What will happen to the frequency, if speed of rotation of coil doubled? 4. When speed of coil is doubled, what will happen to the amplitude? 5. What is amplitude? 6. When two magnetic poles of a magnet are closer, magnetic field is stronger or weaker? 7. What is the cause of induced current in electromagnetic induction? 8. A rectangular coil of a copper wire is rotated air the magnetic field. In how many revolutions, the direction of induced current is changed? 9. What is electromagnetic induction? 10. Name the device producing electric current. 11. What is the role of the two conducting stationary brushes in a simple electric motor? 12. What does the degree of closeness of magnetic field lines signify? 13. What is a compass needle? What is it used for? 14. What is the direction of magnetic field lines? (i) Inside the bar magnet (ii) Outside the bar magnet. 15. How will you find the direction of magnetic field at a given point? 16. A long straight wire, placed along the N-S direction carries a current flowing from north to south. If a small compass needle is placed under this wire,towards which way will its north pole get deflected? 17. How will the magnetic field, due to current carrying wire at a given point change, (a) current flowing through the wire were doubled. (b) distance of the field point from the wire were doubled. 18. How will you find out the polarity of a solenoid? 19. What are the types of current ratings used in domestic circuits? 20. What is the potential difference maintained between the live wire and the neutral wire of a domestic circuit in India? 21. To which wire is the ON/OFF switch connected? 22. What is the function of main switch? 23. Write the source of AC and DC (current) Two marks. 24.(a) Sketch a graph of voltage (potential difference) against time for an A.C generator. (b) On the same axis sketch a second graph to show the output of the generator when it is rotated as half rate in (a). 25. A magnetic compass needle is placed in the plane of paper near point A as shown in the figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why? A.

2 26. Describe an activity to show magnetic field lines produced when current is passed through circular coil. 27. What does direction of thumb indicate in the right hand thumb rule? In what way does this rule is different from Fleming s left hand rule? 28. A B is a current carrying conductor in the plain of the paper as shown in diagram. What are the directions of magnetic fields produced by it at the points P and Q? Given r 1 > r2, Where will the strength of the magnetic field be larger? B r 2 Q r 1 P 29. With the help of diagram of experimental set up describe an activity to show that the force acting on a current carrying conductor placed on magnetic field increases with increase in field strength. 30. How will the magnetic field produced at a point due to a current carrying circular coil change if we: (a) Draw the pattern of magnetic field lines through and around a current carrying solenoid. (b) What is the pattern of magnetic field lines inside the solenoid and what does these indicate? (c) How can a solenoid can be utilized to make an electromagnet? 31. A domestic electric circuit (220V) has 5 A fuse. How many bulbs of 100w ; 220 V ratings can be safely use on this line. 32. State the consequences and causes of short circuit. 33. With the help of labeled circuit diagram describe an activity to illustrate the pattern of the magnetic field lines around a straight current carrying long conducting wire. (i) Name the rule that is used to find the direction of magnetic field associated with a current carrying conductor. (ii) Is there a similar magnetic field produced around a thin beam of moving (a) alpha particles (b) neutrons? Justify your answer. Three marks 34.What is an electromagnet? How can you make an electromagnet in your school laboratory? 35. Describe an activity to show that an electric current is induced in a coil when magnetic field around it is changed. 36. Write one application of each of the following: (a) Right hand thumb rule (b) Fleming s left hand rule (c) Fleming s right hand rule 37. What is meant by solenoid? How does a current carrying solenoid behave? Give its main use. 38. State three factors on which the strength of an electromagnet depends. 39. State the functions of electricity board fuse, main switch and distribution box, in common domestic circuits. Five marks 40. (a) Cable of microwave oven have three wires inside which have insulation of different colour Black,green, red. Mention the significance of each colour and potential difference between red and black. A

3 (b) Design an activity with the help of two nails, very thin aluminum sheet, a 12V battery and a key to Illustrate how fuse works. 41. Name the electric device that converts mechanical energy into electrical energy. Draw the labeled diagram and explain the principle involved in this device. 42. What is meant by overloading of an electrical circuit? Explain two possible causes due to which overloading may occur in household circuit.state one prevention measure that should be taken to avoid the overloading of domestic electric circuits. Ch: 14 Sources of energy One mark 1.. What do you mean by fuel? 2. Name a device which can be used for cooking so as to save fuel. 3. List any two characteristics which you look for in a good fuel. 4. Write any two application of bio-gas. 5. If you could use any source of energy for heating your food, which one would you use and why? 6. Name two fossil fuels. 7. Which country is known as country of winds. 8. What are the disadvantages of fossil fuels? 9. Why are we looking at alternate sources of energy? 10. Which of the following is not an example of bio-mass energy source? (a) Wood (b) Gobar Gas (c) nuclear energy (d) coal. 11. Name four gases present in bio-gas. 12. Name the part of bio-gas plant where reactions take place in the absence of oxygen. 13. Name the kind of energy possessed by wind and the device used to harness it. 14. List two conventional sources of energy. 15. List two nutrients that slurry left behind in the bio gas plant contains. 16.List two energy transformation that takes place in thermal power plant. 17. Name the major constituent of natural gas. 18. How is charcoal different from wood? 19. Bio gas is called gobar gas.why? 20. In which type of reaction, law of conservation of mass is not true? 21. What is geothermal energy? 22. Can any source of energy be pollution free? Why or why not? 23. Write two different ways of harnessing energy from ocean? 24. Name the component of solar cell. 25. What do you mean by solar energy? 26. Define nuclear fission? 27. List two non conventional source of energy. 28. Name any two elements used in fabricating solar cells. 29. Why a solar cooker painted black? 30. What is acid rain? 31. Name one fuel used in nuclear reactor. 32. Name the reaction responsible for large energy production in the Sun. Two marks 33. List two advantages of dams for the production of hydroelectricity. 34. Write two limitations of using wind energy.

4 35. Bio gas is a boon for farmers / Bio gas is an excellent fuel. why?. Give two practical uses of bio gas. 36. State two advantages of bio gas over fossil fuels. 37. Describe the working of thermal power plant. 38. Fossil fuels are energy rich compounds of an element X which were originally made by plants with the help of Sun s energy. (i) Name the element X. (ii) Name the another element which is usually found in combination with element X in fossil fuels. 39.Out of element A and B with mass number 2and 235 respectively, which one is suitable for making (i) a nuclear reactor (ii) a hydrogen bomb. Name the nuclear reaction involved in each case. Write one difference between the two types of nuclear reactions. 40. What are solar panels? Write three uses of solar panels. 41. Write four nuclear power reactors located in India. 42. Give two uses of geothermal energy. Three marks 43. Write the full form of CNG, LPG and PNG. 44. Give any three reasons to justify ; LPG is an ideal fuel. 45. If energy is neither be created nor be destroyed, explain with an example why should we worry about our resources. 46. Why should people oppose construction of Tehri dam on river Ganga and Sardar Sarovar project over river Narmada? 47. (i) Charcoal is better fuel than wood.why? (ii) Why should fossil fuels be conserved? (iii) List at least two fuels obtained from bio-mass. 48. What is bio-mass? How does bio gas plant help to reduce the problem of pollution? 49. Compare and contrast fossil fuels and the Sun as direct source of energy. 50. Why is it not possible to make use of solar cells to meet all needs? State three reasons. 51. Describe the process of nuclear fission. Write steps to involved in generating electricity in a nuclear reactor. 52. What happens when wood is burnt in limited supply of air? Name the residue left behind after the reaction and state two advantages of using residue as a fuel over wood. 53. Describe the structure of wind-mill. 54. What are fossil fuels? Name any two fossil fuels. Why should fossil fuel be conserved? 55. Which power plant is better : coal based or natural gas based? 56. Give three importance of non conventional sources of energy. 57. State the principle of ocean thermal energy conversion plant. Explain how the plant works? Write one essential condition for it to operate properly. 58. Write three merits and demerits of the energy that can be obtained from the deep inside the earth? Ch: 7 Control and coordination One mark 1. State the function of (i) Gustatory receptor (ii) Olfactory receptor 2. Name two tissues that provide control and coordination in multicellular organisms. 3. How is the spinal cord be protected in the human body. 4. How is the brain be protected from injury and shock? 5. Name the part of the neuron (i) where information is acquired (ii) through which information travels as an electrical impulse.

5 6. Mention the function of mid brain in humans. 7. Mention the function of hind brain in humans. 8. Define reflex arc. 9. What are plant hormones. 10. What is hydrotropism? 11. A young green plant receives light from one direction only, what will happen to its shoots. 12. (i) Name the gland known as master gland. (ii) Name the hormone known as emergency hormone. 13. Give one example of chemotropism. 14. Name any two types of tropisms. 15. What is the stimulus in (i) phototropism (ii) Geotropism. 16. Name the fluid that is found between the meninges. 17. Which part of the brain is concerned with memory, will and power? 18. Name the place of the human body where largest number of neurons are found? 19.Name the part of the brain which is concerned with muscular coordination in the human body. 20.(i) Name the hormone that helps in regulating level of sugar in our blood. (ii) Name the gland that secretes it. 21. Why pituitary called the master gland? 22. Why are hormones called chemical messengers? 23. Why are endocrine glands called ductless glands? Two marks 24. Which part of the brain controls involuntary actions? Write the function of any two regions of it. 25. What is geotropism. State its two types. 26. What is tropic movement? Explain with the help of an example. 27. (i) Name the endocrine gland associated with the (i) Brain (ii) Kidneys (ii) Which gland secretes digestive enzymes as well as hormones? (iii) Which endocrine gland present in males but not in females? 28. What will happen if intake of iodine is low in our diet? 29. Name a gland associated with brain Which problem is caused due to the deficiency of the hormone released by this gland? 30. Name the hormone secreted by the human testis.state its any one function. 31. Write the function of (i) sensory neuron (ii) cranium (iii) vertebral column (iv) motor neuron. 32. Describe the feed back mechanism. 33. Name two types of neurons? How is the functioning of one is different from the other? 34. Which is the control centre of the reflex action? What is the route taken by the reflex action called? 35. Which is the largest part of the brain? What are its functions? 36.Write the two differences between cerebellum and cerebrum. Three marks 37. Mention the part of the brain which (i) Enables us to ride a bicycle (ii) Changes the size of the pupil of eye. (iii) Maintains the blood pressure uf the body. (iv) Regulates respiration (v) Maintains posture and equilibrium (vi) Detects smell of agarbatti ( inscence stick) 38. What is synapse? In a nerve cell how an electrical impulse is created and what is the roll of synapse in this context?

6 39. State the functions of any three sub units of the structural and functional unit of nervous system. (i) Name the two constituents of CNS in the human body (ii) What is the need of system of control and coordination in human beings. 40. What are nastic and curvature movements? Give one example of each. 41. State how the concentration of an auxin stimulates the cells to grow longer on the side of the shoot when it is away from the light? 42. Write name of the gland and function of the hormone; (i) Thyroxine (ii) Insulin (iii) Adrenalline 43. List in tabular form three differences between nervous control and chemical control. (i) Which plant hormone is present in greater concentration in the areas of rapid cell division? (ii) Give one example of plant growth promotor and one example of plant growth inhibitor. 44. Describe hydrotropism with the help of an activity. 45. Write the functions of any three phytohormones. Five marks 46. What are the major parts of the brain? Mention the function of each part. 47. What is meant by reflex action? With the help of labeled diagram trace the sequence of events that take place when a tennis player see the ball coming to him. 48. State the structural and functional unit of nervous system. Draw its neat and labeled diagram and write its two functions. 49. Draw the neat and labeled diagram of human brain and write the function of each part. Ch : 3 Metals and non metals One mark 1.Name a non metal which is lustrous and a metal which is non lustrous. 2. An element forms an oxide Al 2 O 3 which is acidic in nature. Identify A as a metal or a non metal. 3. Why does calcium float in water? 4. Arrange the following metals in the decreasing order of the reactivity. Na, K, Cu, Ag. 5. Name a metal which is neither hard nor strong. 6. Name two metals which when contact with our palm become liquid. 7. Name a metal and a non metal which is liquid at room temperature. 8. Give two reasons why mercury is used in the thermometers? 9. Give two reasons why aluminium is used for the manufacture of soft drinks cans. 10. Name two metals which react with steam and not with hot water. 11. Which is the most abundant element in the earth crust. 12. Which is the most abundant metal in the earth crust. 13. Which is the most abundant element in the universe. 14.What happens when diluted sulphuric acid is poured on copper plate? 15. What type of oxides are formed when metal combines with oxygen? 16. Name a non metal which conducts electricity. 17. Name two metals which react with very dilute HNO 3 to evolve hydrogen. 18. Which gas is produced when metal reacts with dil. acid or water? 19. Name the iron compound in haematite. Write its chemical formula. 20. What chemical process is used for obtaining a metal from its oxide? 21. Why is magnesium never found in the elemental state in nature? 22. Which gas is liberated in roasting?

7 Two marks 23. A metal M does not liberate hydrogen from acids but reacts with oxygen to form a black coloured product.identify M and black coloured product and also explain the reaction of M with oxygen 24. A solution of CuSO4 was kept in iron pot. After few days, the iron pot was found to have holes in it..explain the reason in terms of reactivity. Write the equation for the reaction involved. 25. When metal X is treated with cold water, it gives a base X with molecular formula XOH and liberated a gas Z which easily catches fire. Identify X,Y,and Z and also write the equation involved. 26. Give reason: (i) School bells are made up of metals. (ii) Electrical wires are made up of copper. 27. Write chemical equations which shows aluminium oxides reacts with acids as well as base. 28. Explain how mercury is extracted from its sulphide ore, Give equation for the reaction involved. 29. Name the method used for refining of impure copper. What would you take as anode, cathode and electrolyte. Three marks 30. Difference between roasting and calcination. Explain the two with the help of suitable chemical equations. 31. What is an alloy? State the constituents of solder. Which property of solder makes it suitable for welding electrical wires. 32. You are given samples of three metals Sodium magnesium and copper. Suggest any two activities to arrange them in order of decreasing reactivity. 33. You are provided magnesium ribbon and sulphur powder. Explain with the help of an activity that metal oxides are basic and non-metalic oxides are acidic in nature. 34. Write the balanced chemical equations for the following reactions; (i) Dilute sulphuric acid reacts with aluminium powder. (ii) Dil. hydrochloric acid reacts with sodium carbonate. (iii) Carbon dioxide is passed through lime water. 35. (i) Show the formation of potassium chloride by transfer of electrons. (ii) Name the type of bond formed. (iii) List the two characterstics of the bond formed. 36. Suggest a method of reduction for the following metals during the metallurgical process. (i) Metal A which is one of the last ( second or third position) on the reactivity series. (ii) Metal B gives vigorous reaction even with the cold water and air. (iii) Metal C which is kept in the middle of the reactivity series. 37. Give reasons; (i) Metals conducts electricity. (ii) Metal ores are first converted into their oxides. (iii) Ionic compounds are hard and solid. Five marks 38. Distinguish between metals and nonmetals on the basis of (i) two physical quantities (iii) three chemical quantities. 39. (i) Show the formation of sodium chloride. Write the type of the compound formed. (ii) Write the two properties of the compound formed. 40. Write chemical equations for the following reactions. (i) zinc carbonate is calcined. (ii) Cinnabar is heated in presence of air (iii) Manganese dioxide is heated with aluminium powder. (iv) Calcium metal reacts with water. (v) Zinc oxide is heated with carbon.

8 41. (i) What is corrosion of metals? Name a metal which does not corrode and which corrodes when exposed to the atmosphere. (ii) How will you show that rusting of iron needs oxygen and moisture at the same time? 42. (i) Write the steps involved in the extraction of pure metals in the middle of activity series from their carbonate ores. (ii) How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper. PRACTICALS 1. What will happen when zinc is added to copper sulphate solution? Give reason. 2. If M + BX MX + B and B is reddish brown deposit, then what will be M and BX out of Fe, Al, Zn, Mg and CuSO 4, FeSO 4, ZnSO 4 and MgSO 4, respectively? 3. A + BX == AX + B C + AY == CX + A Identify most reactive and least reactive metals. Justify your answer. 4. (i) Cu + FeSO 4 (ii) FeSO 4 + Al Which reaction will take place and why? Complete the reactions. 5. Al, Zn, Cu, Fe are added to ZnSO 4, CuSO 4, Al 2 (SO 4 ) 3 and FeSO 4 solutions respectively. Write your observation in tabular form ( ) for the reaction taking place. ( ) for the reaction not taking place 6. Al is dropped in FeSO 4, ZnSO 4, CuSO 4. Write your observations. 7. What will happen when (i) Cu is added to Al 2 (SO 4 ) 3 solution 8. Give the colour of the following solutions: (ii) Al ids added to CuSO 4 solution (i) ZnSO 4 (aq) (ii) CuSO 4 aq) (iii) Al 2 (SO 4 ) 3 (aq) (iv) FeSO 4 (aq) Syllabus for Half Yearly Examination Chapters :- 1,2, 3, 6, 7, 12, 13, 14 ( Chapters of periodic test ( 1 ) are also included.) Marking Scheme for Half- Yearly Examination Q1 Q2 1 mark 1 x 2 = 2 Q2 Q5 2 marks 2 x 3 = 6 Q6 Q15 2 marks 2 x 3 = 6 Q16 Q21 2 marks 2 x 3 = 6 Q22 Q27 2 marks (practicals) 2 x 3 = 6 Total Marks -- 80