CBSE Class 10 Science Past Paper PDF

50 Important Questions for CBSE Class 10 Science 1. Chemical Reactions and Equations 1. Define a chemical reaction and explain with an example. 2. Balance the following chemical equation: Fe+H2O→Fe3O4+H2\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2Fe+H2​...

50 Important Questions for CBSE Class 10 Science 1. Chemical Reactions and Equations 1. Define a chemical reaction and explain with an example. 2. Balance the following chemical equation: Fe+H2O→Fe3O4+H2\text{Fe} + \text{H}_2\text{O} \rightarrow \text{Fe}_3\text{O}_4 + \text{H}_2Fe+H2​O→Fe3​O4​+H2​. 3. Explain the types of chemical reactions with examples. 4. What is a redox reaction? Give a suitable example. ak 5. Explain the term "corrosion" and mention two methods to prevent it. 2. Acids, Bases, and Salts 6. What is the pH scale? Mention its significance in everyday life. th 7. Explain the reaction between an acid and a base with an example. 8. How is baking soda produced? Write its chemical reaction. 9. Describe the preparation and uses of bleaching powder. 3. Metals and Non-Metals pa 10. What happens when an acid reacts with a metal? Give an example. 11. Explain the physical properties of metals and non-metals. m 12. Why do ionic compounds have high melting and boiling points? 13. Describe the process of electrolytic refining of copper. 14. Explain the reactivity series of metals. 15. What are alloys? Give two examples and their uses. ha 4. Carbon and its Compounds 16. Explain the covalent bonding in carbon compounds. ub 17. What is a homologous series? Give an example. 18. Describe the cleansing action of soaps and detergents. 19. Differentiate between saturated and unsaturated hydrocarbons. 20. What is ethanol? Write its properties and uses. sh 5. Periodic Classification of Elements 21. Explain Mendeleev’s periodic law and how it led to the periodic table. 22. State and explain the modern periodic law. 23. What is meant by the atomic radius? How does it change across a period? 24. Define electronegativity and explain its variation in the periodic table. 25. How are elements classified into groups and periods? 6. Life Processes  26. Explain autotrophic and heterotrophic nutrition with examples. 27. Describe the process of human respiration. 28. Explain the structure and function of the human heart. 29. Describe the process of excretion in humans. 30. What is transpiration? Explain its significance. 7. Control and Coordination 31. Describe the structure of the human brain. 32. What is reflex action? Explain with an example. 33. What are hormones? Mention their functions and sources. ak 34. Explain the structure of a neuron and its function. 35. How do plants respond to light? Mention plant hormones involved. 8. How Do Organisms Reproduce? th 36. Explain the process of asexual reproduction in amoeba. 37. Describe the human reproductive system. pa 38. What is pollination? Explain its types. 39. Discuss the role of DNA in inheritance. 40. Explain reproductive health and its importance. 9. Heredity and Evolution m 41. Explain Mendel’s laws of inheritance with an example. 42. Why are variations important? 43. Describe the process of natural selection. ha 44. How is sex determined in Human beings? 45. Explain the concept of acquired and inherited traits. 10. Light – Reflection and Refraction ub 46. State the laws of reflection. Explain their application. 47. What is refraction? Describe the refraction through a prism. 48. Explain the functioning of the human eye. sh 49. What is a convex lens? Describe its image formation. 50. Discuss the defects of vision and their correction. 50 Important Questions for CBSE Class 10 Social Science History 1. Explain the causes and consequences of the French Revolution. 2. Describe the process of unification of Germany.  3. Discuss the role of Gandhiji in the Indian National Movement. 4. What were the causes of the Non-Cooperation Movement? 5. Describe the impact of print culture on Indian nationalism. Geography 6. What are different types of resources? Explain with examples. 7. Describe soil erosion and methods to control it. 8. Explain the importance of water conservation. 9. What are agro-based industries? Give examples. 10. Describe the location and importance of iron and steel industries in India. ak Civics (Political Science) 11. What is power-sharing? Explain with examples. th 12. Describe the main features of federalism in India. 13. Discuss the challenges faced by political parties in India. 14. Explain the outcomes of democracy. Economics 16. Define development. How is it measured? pa 15. How do political parties shape public opinion? 17. What are the differences between primary, secondary, and tertiary sectors? m 18. Discuss the role of banks in the Indian economy. 19. What is globalization? Explain its impact on the Indian economy. 20. Describe the significance of organized and unorganized sectors in India. ha History (Continued) 21. What was the impact of the Civil Disobedience Movement? ub 22. Describe the significance of the Dandi March. 23. Discuss the causes and consequences of the Revolt of 1857. 24. Differentiate between the failure of non-cooperation with the civil disobedience movement. sh Geography (Continued) 26. What is the importance of forests and wildlife resources? 27. Discuss the distribution of water resources in India. 28. Explain the cropping patterns and major crops grown in India. 29. Describe different methods of irrigation used in India. 30. What are minerals? Classify them with examples. Civics (Continued)  31. What is secularism? How is it implemented in India? 32. Discuss the role of local government in India. 33. Explain the working of political parties in democracy. 34. How does democracy reduce economic inequality? 35. What is the role of citizens in a democracy? Economics (Continued) 36. How are economic activities classified based on employment? 37. What are the advantages of the public sector? 38. Explain the impact of liberalization on India. ak 39. Discuss the role of trade unions in the Indian economy. 40. What is sustainable development? Why is it important? History (Final) th 41. Describe the role of cultural nationalism in the Indian freedom struggle. 42. What do you understand by satyagraha? What was rowlatt act? pa 43. Discuss the rise of nationalism in Europe. 44. What were the effects of colonization on Indian agriculture? 45. Explain the importance of the Non-Aligned Movement. Geography (Final) m 46. Discuss the significance of renewable and non-renewable energy resources. 47. What are the factors affecting the location of industries? 48. Explain the need for water harvesting. ha 49. Describe the role of climate in determining the cropping pattern. 50. What are the different modes of transport and their significance? ub sh