CBSE 10 Science Pre-board 2024-25: 50 Most Important Questions – Download PDF

Prepare effectively for the CBSE Class 10 Pre-Board Exam 2024-25 with this comprehensive list of the 50 most important Science questions. Covering key topics from Physics, Chemistry, and Biology, these questions are curated to match the latest CBSE exam pattern, ensuring focused preparation.

These include short/long answers to help you understand the question types and difficulty level.

Practicing these questions will enhance your grasp of crucial topics, improve time management, and identify your strengths and weaknesses. By reviewing thoroughly, you’ll build confidence for both pre-board and final board exams.

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CBSE Class 10th Pre-board Exam 50 most important Science Questions

Chemical Reactions and Equations

1. Define a chemical reaction and explain with an example.
2. Balance the following chemical equation: Fe+H2O→Fe3O4+H2Fe+H2​O→Fe3​O4​+H2​
3. Explain the types of chemical reactions with examples.
4. What is a redox reaction? Give a suitable example.
5. Explain the term "corrosion" and mention two methods to prevent it.

Acids, Bases, and Salts

6. What is the pH scale? Mention its significance in everyday life.
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.
10. What happens when an acid reacts with a metal? Give an example.

Metals and Non-Metals

11. Explain the physical properties of metals and non-metals.
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.

Carbon and its Compounds

16. Explain the covalent bonding in carbon compounds.
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.

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?

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.

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.
34. Explain the structure of a neuron and its function.
35. How do plants respond to light? Mention plant hormones involved.

How Do Organisms Reproduce?

36. Explain the process of asexual reproduction in amoeba.
37. Describe the human reproductive system.
38. What is pollination? Explain its types.
39. Discuss the role of DNA in inheritance.
40. Explain reproductive health and its importance.

Heredity and Evolution

41. Explain Mendel's laws of inheritance with an example.
42. Why are variations important?
43. Describe the process of natural selection.
44. How is sex determined in Human beings?
45. Explain the concept of acquired and inherited traits.

Light - Reflection and Refraction

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.
49. What is a convex lens? Describe its image formation.
50. Discuss the defects of vision and their correction.

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