HEREDITY AND EVOLUTIONTEST MAXIMUM TIME: 40 MINUTES MAXIMUM MARKS: 20 marks 1. Name two human traits that show variation. (1) 2. What is microevolution? (1) 3. Who is known as �Father of genetics�? (1) 4. Why evolution should not be equated with progress? (1) 5. How many pairs of chromosomes do human beings have, specify the types of chromosomes also? (2) 6. How is the sex of the child determined in human beings? (2) 7. What is the speciation? How does it occur? (2) 8. Define evolution. State Darwin�s theory of evolution. (5) 9. What are the various evidences in factors of evolution? (4) 10. Which of the following pair of sex chromosomes produces a male and a female child- XX or XY? (1) HOW DO ORGANISMS REPRODUCE? TEST Time taken: 40minutes Maximum marks: 25 ma 1. Name two nucleic acids? (1) 2. What happens during copying of DNA? (1) 3. Why does organism reproduce? (1) 4. What is binary and multiple fission? Name the organism in which they occur. (3) 5. How do potato and Bryophyllum plants reproduce vegetatively? (2) 6. Devise an experiment to show germination of gram seed. (3) 7. Draw well labeled diagram of a bisexual flower. (3) 8. What is self and cross pollination? (2) 9. State the functions of a. Testis b. Ovaries c. Vas deferens d. Stamen e. Pistil (5) 10. What are the different methods of contraception in males and female human beings? (4) MANAGEMENT OF NATURAL RESOURCES Test Maximum time: 40 minutes Maximum marks: 20 marks 1. What are 3 R�s used to save environment? 1 2. Why fossil fuels should be used judiciously?1 3. Name any one stakeholder. 1 4. What are the products formed when coal and petroleum are burnt? 2 5. Why the forests are called as biodiversity hot spots? 2 6. Name two industries based on forest produce. 2 7. What are the advantages of water? explain it with respect to forest, wildlife and water resources.4 8. Dams are constructed on the river for multipurpose use. Give its advantages and disadvantages. 4 9. How does mining cause pollution? 2 10. Why it is necessary to conserve water and wildlife? 1 Test Our Environment Maximum time- 30 minutes Maximum marks-25 1. What are decomposers? Write their importance with respect to our environment. (2) 2. Write the causes of depletion of ozone layer. How can we prevent it? (3) 3. Explain the formation of ozone layer. (2) 4. Mention three information obtained from the energy flow diagram. (3) 5. What are food chains and food webs? Why are smaller food chains better? (4) 6. Energy flow in a food chain is unidirectional. Explain (3) 7. Give any three methods to reduce the problem of waste disposal. (3) 8. Differentiate between natural and artificial ecosystem. (2) 9. Write the full form of UNEP. (1) 10. Write the names of any two decomposers. (2) TEST FOR LIFE PROCESSES MAX MARKS: 30 MAX TIME:60 mins 1. List down the raw materials for photosynthesis? (1 Mark) 2. Specify what is the role of bile juice in the process of digestion? (1 Mark) 3. Name the respiratory organ in fish and earthworm. (1 Mark) 4. Name the types of blood vessels used for the transportation of blood. (1 Mark) 5. What is dialysis? (1 Mark) 6. How is respiration in plants and respiration in animals different? (2 Marks) 7. Draw the labeled diagram of the human digestive system. (2 Marks) 8. How are alveoli designed and why? (2 Marks) 9. Define excretion. What are the two organs in human beings that act as accessory excretory organs? (2 Marks) 10. State the role of the following (i) Chloroplasts (ii) Diaphragm (iii) Larynx (3 Marks) 11. Give reasons for the following: (i) The glottis is guarded by epiglottis. (ii) It is said to not speak while eating. (iii) Walls of trachea are supported by cartilage rings. (3 Marks) 12. Leaves of a potted plant were coated with wax to block the stomata. Will this plant remain alive and healthy for long? State three reasons for your answer. (3 Marks) 13. Describe the process and importance of double circulation in humans. (3 Marks) 14. (i) Name the blood vessel that brings oxygenated blood to the human heart. (5 Marks) (ii) Which chamber of human heart receives oxygenated blood? (iii) Explain how oxygenated blood from this chamber is sent to all parts of the body. HEREDITY AND EVOLUTION PREVIOUS YEAR QUESTIONS 1. "We cannot pass on to our progeny the experiences and qualifications earned during our life time". Justify the statement giving reason and examples. (CBSE 2015) 2. How many pairs of chromosomes are present in human beings? Out of these how many are sex Chromosomes? How many types of sex chromosomes are found in human beings?) "The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determination of sex of a newborn to justify this statement. (CBSE 2015) 3. Tabulate two distinguishing features between acquired traits and inherited traits with one example of each. (CBSE2013) 4. “The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it.” Justify this statement with the help of flow chart showing determination of sex of a newborn. (CBSE 2013) 5. A cross was made between pure breeding pea plants one with round and green seeds and the Other with wrinkled and yellow seeds. (a) Write the phenotype of F1progeny. Give reason for your answer. (b) Write the different types of F2 progeny obtained along with their ratio when F1 progeny was selfed (CBSE 2014) 6. Define the term �evolution�. “Evolution cannot be equated with progress”. Justify this statement (CBSE 2012) 7. Distinguish between homologous organs and analogous organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a suitable reason. (CBSE 2012) 8. Explain the terms: (i)Speciation (ii)Natural selection (CBSE 2011) 9. Explain Mendel�s law of independent inheritance. Give one example (CBSE 2011) 10. (a) Give the evidence that the birds have evolved from reptiles. (b) Insects, octopus, planarian and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess? Justify your answer giving reason. (CBSE 2014) HOW DO ORGANISMS REPRODUCE? PREVIOUS YEAR QUESTIONS 1. Name two plants that are grown by vegetative propagation. (CBSE 2016) 2. What is reproduction? Explain two advantages of sexual reproduction over asexual reproduction (CBSE 2016) 3. What is reproduction? Mention the importance of DNA copying in reproduction. (CBSE 2008) 4. List any two differences between pollination and fertilization. (CBSE2008) 5. Name two sexually transmitted disease caused due to infection and viral infection. How it can these be prevented? (AI 2008) 6. Explain the terms: a. Implantation b. Placenta c. What is the average duration of human pregnancy? (CBSE 2009) 7. Why is DNA copying is an essential part of the process reproduction? (AI 2009) 8. List any four methods of contraception used by humans. How does their use have a direct effect on the health and prosperity of a family? (CBSE 2015) 9. Define the terms pollination and fertilization. Draw a diagram of a pistil showing pollen tube growth into the ovule and label them: OR Describe in brief the role of (i)testis (ii) seminal vesicle, (iii) vas deferens, (iv)ureter and (v) prostate gland in human male reproductive system (CBSE 2012) 10. (a) Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma. (b)Write the names of male and female reproductive parts of a flower. OR (a)What is fragmentation in organisms? Name a multicellular organism which reproduces by this method. (b)What is regeneration in organism? Describe regeneration in Planaria with the help of a suitable diagram. (CBSE 2011) MANAGEMENT OF NATURAL RESOURCES SAMPLE PAPER QUESTIONS 1. List two traditional system of water harvesting. (CBSE 2008 F) 2. List four changes you would incorporate in your life cycle in a move towards sustainable use of available resources. (AI CBSE 2008,2009 F) 3. State two reasons of each of conserving(AI CBSE 2008) a. Forest b. Wild life 4. What are natural resources? State two factors that work against an equitable distribution of these resources. (AI CBSE 2009) 5. Why must we conserve our forests? List any two causes for forestation taking place. (AI CBSE 2009) 6. What is Chipko Movement? Why should we conserve forests? (AI CBSE 2009) 7. List four advantage of water harvesting. (AI CBSE 2009) 8. How do advantages of exploiting natural resources with short term aims differ from the advantages of managing our resources with a long term perspective? (CBSE 2009 F) 9. What is wild life? How is wild life important for us? ( CBSE 2009 F) 10. List any two causes of our failure to sustain availability of underground water. (CBSE 2009) Sample Paper Life Processes 1. In human alimentary canal, name the site of complete digestion of various components of food. Explain the process of digestion. [CBSE (CCE) 2012] 2. List in tabular form, three differences between arteries and veins. [CBS (CCE) 2012] 3. List the three kinds of blood vessels of human circulatory system and write their functions in tabular form. [CBSE I CCE) 2012] 4. (a) "The breathing cycle is rhythmic whereas exchange of gases is a continuous process". Justify this statement. (b) What happens if conducting tubes of circulatory system develops a leak? State in brief, how could this be avoided? (c) How opening and closing of stomata takes place? [CBSE (CCE) 2011] 5. Draw a diagram of the front view of human heart and label any six parts including at least two that are concerned with arterial blood supply to the heart muscles. [CBSE (CCE) 2011] 6. Describe in brief the function of kidneys, ureters, urinary bladder and urethra. [Foreign 2010] 7. Explain the process of breakdown of glucose in a cell (i) in the presence of oxygen, (ii) in the absence of oxygen. [HOTS,Foreign 2010] 8. (i) Label any 4 parts in the given diagram. (h) What are the two functions represented in this diagram? [HOTS, CBSE Sample Paper 2009] 9. What is double circulation in human beings? Why is it necessary? [HOTS, NCERT, Delhi 2008C] 10. (a) Name two different ways in which glucose is oxidised to provide energy in various organism. (b) Write any two differences between the two oxidation of glucose in organisms. [Al 2008] 11. Write any three differences between aerobic and anaerobic respiration. [HOTS, NCERT Exemplar, NCERT, AI 2008] 12. (a) Name the process by which autotrophs prepare town food. (b) List the three events which occur during this process. (c) State two sources from which plants obtain nitrogen for the synthesis of proteins and other compounds. [Foreign 2008] Sample Paper Acids, Bases and Salts 1. How will you test for a gas which is liberated when HCL reacts with an active metal? (CBSE 2008) 2. What is baking powder? How does it make the cake soft and spongy? (CBSE 2008) 3. When fresh milk is changed into curd will its pH value increase or decrease? Why? 4. Give Arrhenius definition of an acid and a base. (CBSE 2009) 5. What happens chemically when quick lime is added to water? (CBSE 2008) 6. Name the gas evolved when dilute HCL reacts with Sodium hydrogen carbonate. How is it recognized? (CBSE 2008) 7. How does the flow of acid rain water into a river make the survival of aquatic life in the river difficult? (CBSE 2008) 8. How is the pH of a solution of an acid influenced when it is diluted? (CBSE 2008 F) 9. How does the pH of the solution change when a solution of base is diluted? (CBSE 2008 F) 10. Arrange these in increasing order of their pH values- NaOH, blood, lemon juice. (CBSE 2008 F) 11. Two solutions of A and B have pH values of 5 and 8. Which solution will be basic in nature? (CBSE 2008 C) 12. Why does tooth decay start when pH of mouth is lower than 5.5? (CBSE 2009) 13. What would be the colour of litmus in a solution of sodium carbonate? (CBSE 2009) 14. Name the products obtained when sodium hydrogen carbonate is heated. Write the chemical equation for the same. (AI CBSE 2009) 15. Write the chemical formula of washing soda and baking soda. Which one of these two is an ingredient of antacids? How does it provide relief in stomachache? (CBSE 2008 F) 16. What do you mean by �water of crystallization� of a substance? Describe an activity to show that blue copper sulphate crystals contain water of crystallization. (CBSE 2009 F) 17. How can washing soda be obtained from baking soda? Name an industrial use of washing soda other than washing clothes. (AI CBSE 2008) 18. Why does 1 M HCL solutions have a higher concentration of H+ ions than 1M CH3COOH solution? (AI CBSE 2009) Class X Science Sample Paper for Carbon and its Compounds 1. (a) Complete the following equations: (b) Write the name of the following: (i) CH3CH2COOH (ii) CH3CH2Br (c) Draw the electron dot structure of ethene (C2H4). (CBSE 2008 C) 2. (a) Name the compound CH3CH2OH and identify its functional group. (b) Give a chemical test to distinguish between ethanol and ethanoic acid. (c) Name the product formed when an organic acid reacts with an alcohol in presence of an acid catalyst. What is the name assigned to this type of reaction? (AI CBSE 2008 C) 3. (a) Name the compound CH3COOH and identify its funcational group. (b) Give a chemical test to identify this compound. (c) Name the gas evolved when this compound acts on solid sodium carbonate. How would you identify this gas? 4. (a) Give a chemical test to distinguish between saturated and unsaturated hydrocarbons. (b) (i) Name the products formed when ethanol burns in air. (ii) What two forms of energy are liberated on burning alcohol? (c) Why is the reaction between methane and chlorine considered a substitution reaction? (AI CBSE 2008 C) 5. Give reason for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. (CBSE 2009) 6. (a) What is vinegar? (b) Describe with a chemical equation, what happens when sodium hydrogen carbonate reacts with ethanoic acid. 7. (a) Write the names of the functional groups in: (b) Describe a chemical test to distinguish between ethanol and ethanoic acid. (c) Write a chemical equation to represent what happens when hydrogen gas is passed through an unsaturated hydrocarbons in the presence of nickel as a catalyst. (CBSE 2009 F) 8. (a) Why does carbon form compounds mainly by covalent bonding? (b) List any two reasons for carbon forming a very large number of compounds. (c) An organic acid „X‟ is a liquid which often freezes during winter time in cold countries, has the molecular formula, C2H4O2. On warmong it with ethanol in the presence of a few drops of concentrated sulphuric acid, a compound „Y‟ with a sweet smell is formed. (i) Identify „X‟ and „Y‟. (ii) Write a chemical equation for the reaction involved. (CBSE 2008) 9. (a) What is homologous series of compounds? List any two characteristics of a homologous series. (b) (i) What would be observed on adding 5% solution of alkaline potassium permanganate solution drop by drop to some warm ethanol taken in a test tube? (ii) Write the name of the compound formed during the chemical reaction. (c) How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property? (CBSE 2008) 10. (a) What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH. (b) State the principle on which the cleansing action of soap is based. (CBSE 2008) 11. (a) What is homologous series? Give one example. (b) What will happens if ethanoic acid reacts with ethanol in the presence of an acid as a catalyst? Name the reaction. Write the chemical reaction for this reaction. (c) Why are soaps ineffective in hard water? (CBSE 2008 C) 12. (a) Distinguish between esterification and saponification reactions of organic compounds. (b) With a labelled diagram describe an activity to show the formation of an ester. (AI CBSE 2009) 13. (a) The structural formula of an ester is Write the structural formula of the corresponding alcohol and the acid. (b) (i) Mention the experimental conditions involved in obtaining ethene from ethanol. (ii) Write the chemical equation for the above reaction. (c) Explain the cleansing action of soap. (CBSE 2009 F) Class 10th Science Sample Paper Chemical Reactions and Equations Q1. What happens chemically when quick lime is added to water? Q2. How will you test for the gas which is liberated when HCL reacts with an active metal? Q3. What is an oxidation reaction? Is it exothermic or endothermic? Give one example of oxidation Reaction. Q4. Give an example of photochemical reaction. Q5. Give an example of a decomposition reaction. Describe any activity to illustrate such a reaction by heating. Q6. Why is respiration considered as exothermic process? Q7. Balance the following chemical equation. Fe(s) +H2O(g) = Fe3O4 + H2(g) MnO2 + HCL = MnCl2 + Cl2 + H2O HNO3 + Ca(OH)2 = Ca(NO3)2 + H2O Q8. On what basis is a chemical equation balanced? Q9. State any two observations in an activity suggesting the occurrence of a chemical reaction. Q10. Name a reducing agent which may be used to obtain manganese from manganese dioxide. Q11. What change in colour is observed when silver chloride is left exposed to sunlight? Also mention the type of chemical reaction. Q12. Define a combination reaction. Give one example of an exothermic combination reaction. Q13. What is observed when a solution of potassium iodide is added to lead nitrate solution? What type of reaction is this? Write a balanced chemical equation for this reaction. Q14. Distinguish between an exothermic and an endothermic reaction. Q15. Distinguish between a displacement and a double displacement reaction. Q16. Identify the type of reaction in the following: Fe + CuSO4(aq) = FeSO4(aq) + Cu(s) 2H2 + O2 = 2H2O Previous Year Questions Metals and Non-Metals 1. Name a reducing agent that may be used to obtain manganese from manganese dioxide. (CBSE 2009) 2. From amongst the metals sodium, calcium, aluminium, copper and mangnesium, name the metal (I) which reacts with metal only on boiling and (II) another which does not react even with steam. (CBSE 2008) 3. (a) Show the formation of NaCl from sodium and chlorine atoms by the transfer of electrons. (b) Why sodium chloride has a high melting point? (c) Name the anode and cathode used in electrolytic refining of impure copper metal. (CBSE 2008) Why are ionic compounds usually hard? How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molten state? (CBSE 2008) On adding dilute HCL acid to copper oxide powder the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution. (CBSE 2008) 4. (a) Show on a diagram the transfer of electron between the atoms in the formation of MgO. (b) Name the solvent in which ionic compounds are generally soluble. (c) Why are aqueous solutions of ionic compounds able to conduct electricity? (CBSE 2008) 5. What are amphoteric oxides? Choose the amphoteric oxides from- Na2O, ZnO, Al2O3, CO2, H2O 6. Why is it that non-metals do not displace hydrogen from dilute acids? (AI CBSE 2008) 7. Show the electronic transfers in the formation of MgCl2 from its elements. (CBSE 2008 F) 8. Which of the following metals will melt at body temperature: gallium, magnesium, caesium, aluminium? (CBSE 2008 C) 9. Name the two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any? (AI CBSE 2008) 10. Give reasons for the following: (i) Gold and silver are used for jewellery making. (ii) carbonate and sulphide ores are usually converted into oxides prior to reduction during the process of extraction. (CBSE 2008 C) 11. Give reasons for the following: (i) Aluminium oxide is considered as an amphoteric oxide. (ii) Ionic compounds conduct electricity in molten state. (CBSE 2008 C) 12. Give reasons for the following: (i) Metals can be given different shapes according to our needs. (ii) Hydrogen is not evolved when a metal reacts with nitric acid. PERIODIC CLASSIFICATION OF ELEMENTS 1. How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move: (a) down a group and (b) from left to right in a period (CBSE 2015) 2. How many vertical columns are there in the modern periodic table and what are they called? (CBSE 2013) 3. Given below are some elements of the modern periodic table: 4Be, 9Fe,14Si, 19K, 20Ca (i)Select the element that has one electron in the outermost shell and write its electronic configuration. (ii)Select two elements that belong to the same group. Give reason for you answer. (iii)Select two elements that belong to the same period. Which one of the two has bigger atomic size? (CBSE 2013) 4. Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group? (CBSE 2013) 5. An element �M� has atomic number 12. 6. (a)Write its electronic configuration. (b)State the group to which �M� belongs. (c)Is �M� a metal or a non-metal. (d)Write the formula of its chloride. (CBSE 2012) 7. What physical and chemical properties of elements were used by Mendeleev in creating his Periodic Table? List two observations which posed a challenge to Mendeleev�s Periodic Law. (CBSE 2008 F) 8. State any two limitations to Mendeleev�s classification. How does electronic configuration of atoms change in period with increase in atomic number? (CBSE 2009) 9. (i) How do you calculate the possible valency of an element from the electronic configuration of its atoms? (ii) Calculate the valency of element X whose atomic number is 9 (CBSE 2011) 10. On the basis of electronic configuration, how will you identify the first and the last element of a period? (CBSE 2011) Sample Paper Electricity Two Mark Questions 1. Name the unit of (a) electrical resistance (b) resistivity 2. Define One Ohm 3. Define Resistivity 4. Determine the direction of conventional current? 5. What is electrical power? Write its unit. Three Mark Questions 6. You take two resistors of resistance 2R and 3R and connect them in parallel in an electric circuit. Calculate the ratio of the electrical power consumed by 2R and 3R? 7. A small bulb has a resistance of 2Ω when cold. It takes up a current of 0.4 A from a source of 4V and then starts glowing. Calculate (i) the resistance of the bulb when it is glowing and (ii) Elaborate on the reason for the difference in resistance? 8. Define resistance and resistivity and also give the relation between them. Explain the dependence of resistance on temperature. 9. A bulb is rated at 330V- 110W. What do you think is its resistance? Three such bulbs burn for 5hrs at a stretch. What is the energy consumed? Calculate the cost in rupees if the rate is 70 paise per unit? 10. Calculate the resistance of 2 km long copper wire of radius 2 mm. (Resistivity of copper = 1.72 x 1 0-8) 11. What connection is used in domestic appliances and why? 12. A 250 watt electric bulb is lighted for 5 hours daily and four 6 watt bulbs are lighted for 4.5 hours daily. Calculate the energy consumed (in kWh) in the month of February. 13. A torch bulb is rated at 3V and 600mA. Calculate it‟s (a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs. 14. State and derive joule‟s law. An electric iron consumes energy at rate of 420w when heating is at maximum rate and 180 w when heating is at minimum. The voltage is 220V .What is the current and resistant in each case? 15. A piece of wire having a resistance R is cut into five equal parts. (i) How will the resistance of each part of the wire compare with the original resistance? (ii) If the five parts of the wire are placed in parallel, how will the resistance of the combination compare with the resistance of the original wire? What will be ratio of resistance in series to that of parallel? Sample Paper Electricity Two Mark Questions 1. Name the unit of (a) electrical resistance (b) resistivity 2. Define One Ohm 3. Define Resistivity 4. Determine the direction of conventional current? 5. What is electrical power? Write its unit. Three Mark Questions 6. You take two resistors of resistance 2R and 3R and connect them in parallel in an electric circuit. Calculate the ratio of the electrical power consumed by 2R and 3R? 7. A small bulb has a resistance of 2Ω when cold. It takes up a current of 0.4 A from a source of 4V and then starts glowing. Calculate (i) the resistance of the bulb when it is glowing and (ii) Elaborate on the reason for the difference in resistance? 8. Define resistance and resistivity and also give the relation between them. Explain the dependence of resistance on temperature. 9. A bulb is rated at 330V- 110W. What do you think is its resistance? Three such bulbs burn for 5hrs at a stretch. What is the energy consumed? Calculate the cost in rupees if the rate is 70 paise per unit? 10. Calculate the resistance of 2 km long copper wire of radius 2 mm. (Resistivity of copper = 1.72 x 1 0-8) 11. What connection is used in domestic appliances and why? 12. A 250 watt electric bulb is lighted for 5 hours daily and four 6 watt bulbs are lighted for 4.5 hours daily. Calculate the energy consumed (in kWh) in the month of February. 13. A torch bulb is rated at 3V and 600mA. Calculate it‟s (a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs. 14. State and derive joule‟s law. An electric iron consumes energy at rate of 420w when heating is at maximum rate and 180 w when heating is at minimum. The voltage is 220V .What is the current and resistant in each case? 15. A piece of wire having a resistance R is cut into five equal parts. (i) How will the resistance of each part of the wire compare with the original resistance? (ii) If the five parts of the wire are placed in parallel, how will the resistance of the combination compare with the resistance of the original wire? What will be ratio of resistance in series to that of parallel? LIGHT PREVIOUS YEAR QUESTIONS 1. List four characteristics of the images formed by plane mirrors. (CBSE 2015) 2. Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed parallel to the principal axis of a convex mirror. Mark on it the angle of incident and the angle of reflection (CBSE 2014) 3. A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror. (a) Write the type of mirror. (b) Find the distance of the image from the object. (c) What is the focal length of the mirror? (d) Draw the ray diagram to show the image formation in this case. (CBSE 2014) 4. State the laws of refraction of light. If the speed of light in vacuum is 3X108 ms-1, find the speed of light in a medium of absolute refractive index 1.5. (CBSE 2014) 5. Which phenomenon is responsible for making the path of light visible? (CBSE 2012) 6. When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. 7. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labeled ray diagram to illustrate it. ( CBSE 2012) 8. The power of the lens is -4.0D. What is the nature of this lens? (CBSE 2008) 9. Which type of mirror is used to give erect and enlarged image of an object? (CBSE 2008) 10. Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the centre of curvature of the mirror. (CBSE 2011) MAGNETIC EFFECTS OF ELECTRIC CURRENT SAMPLE PAPER 1. Name the type of current. (a) used in household supply (b) given in cell (CBSE (CCE) 2011) 2. Name the physical quantities of electromagnetic induction. (CBSE (CCE) 2012) 3. Give one application of electromagnetic induction. (CBSE (CCE) 2012) 4. Name any two appliances which are based on the application of heating effect of electric current. (AI 2009C) 5. What constitutes the field of a magnet? (DELHI 2006) 6. A compass needle is placed near a current carrying wire. State your observation for the following cases, and give reason for the same in each case. a. Magnitude of electric current in the wire is increased b. The compass needle is displayed away from the wire. (CBSE (CCE) 2012) 7. Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating? (CBSE (CCE) 2011) 8. What is meant by the term frequency of an alternating current? What is the value in India? Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy? (CBSE SAMPLE PAPER 2009) 9. What is an electromagnet? Draw a circuit diagram to show how a soft iron piece can be transformed into electromagnet. (DELHI 2008) 10. With the help of neat diagram describe how you can generate induced current in the circuit. (DELHI 2006C) 11. a. Mention effect of electric current on which the working of an electrical fuse is based. b. Draw a schematic labeled diagram of a domestic circuit which has a provision of a main base, meter, one light bulb and a socket. c. Explain the term overloading of an electric circuit. (CBSE (CCE) 2012) 12. a. Describe an activity to demonstrate the pattern of magnetic field lines around a straight conductor carrying current. b. State the rule to find the direction of magnetic field associated with a current carrying conductor? c. What is the shape of a current carrying conductor whose magnetic field pattern SOURCES OF ENERGY PREVIOUS YEAR QUESTIONS 1. Which force is responsible for stability of our universe? 1. Name one fuel used in nuclear reactor. (CBSE CCE 2012) 2. Name the reaction responsible for large energy production in the sun. (CBSE CCE 2012) 3. How has the traditional use of wind energy been modified for our convenience? (AI 2008C) 4. Biogas is considered to be a boon to the farmers. Give reasons. (CBSE CCE 2011) 5. What is a solar cell panel? Mention any three of its applications? (CBSE CCE 2012) 6. Why are many thermal plants set up near coal or oil fields? (AI 2008C) 7. Distinguish between renewable and non-renewable resources of energy. Also give examples (CBSE CCE 2011) 8. What is geothermal energy? What are the advantages of wind energy? (CBSE CCE 2011) 9. Name the device used to convert a. Solar energy into heat b. Solar energy into electricity (DELHI 2006C) 10. Write the principle of generation of electric power by a boiling water type nuclear reactor. Name the coolant used in such a reactor. (DELHI 2005C) 11. a. name four gases which are mainly present in biogas. b. List two advantages of using biogas over fossil fuels. (AI 2006C) 12. List any three hazards of nuclear waste. How does the disposal of nuclear waste pose a problem for the plant and animal life? (CBSE CCE 2012)