CBSE Class 10 Science Important Questions 2025-26

Class 10 is one of the most important stages in a student’s school life. The marks scored in Class 10 board exams build the foundation for future studies and career choices. Among all the subjects, Science holds a special place because it includes concepts from Physics, Chemistry, and Biology. Many students find Science interesting, but at the same time, it can feel challenging because of the variety of topics and the detailed explanations required in the exam. This is where CBSE Class 10 Science Important Questions 2025-26 become very useful.

The CBSE board exam paper is designed in a way that checks how well a student understands the concepts, applies them in real-life situations, and explains them in the correct format. By practicing class 10 science important questions with answers, students get a clear idea of what type of questions are asked, which topics carry more weightage, and how to write accurate and to-the-point answers. These important questions act as a guide for revision and help reduce exam stress.

The important questions for class 10 science with answers are carefully selected from each chapter of the NCERT textbook. They include short-answer questions, long-answer questions, diagram-based questions, and application-based problems. Practicing them regularly ensures that no important topic is left out while preparing. 

Another big advantage of practicing 10th science important questions is that many of these questions are either repeated or asked in a similar way in the board exams. This builds confidence and helps students manage their time better during the actual exam. Along with Science, students also prepare for class 10th social science important question sets, but Science needs extra focus because it requires both theory and practical understanding.

In short, the CBSE Class 10 Science Important Questions 2025-26 act like a roadmap for success. They highlight the key topics, strengthen exam preparation, and make revision easier. With consistent practice of these questions, along with solving previous year papers and NCERT examples, students can easily score high marks and build a strong base for higher studies in Science.

Class 10 Science Important Questions Chapter-wise

Class 10 Science Chapter 1 Important Questions – Chemical Reactions and Equations

This chapter explains different types of chemical reactions and how to balance them.

Important Questions:

1. Write the balanced chemical equation for the reaction of iron with steam.
2. What is a displacement reaction? Give one example.
3. Define oxidation and reduction with examples.
4. Explain the importance of balancing a chemical equation.
5. Write equations for:
   • (a) Decomposition of calcium carbonate
   • (b) Rusting of iron

Class 10 Science Chapter 2 Important Questions – Acids, Bases and Salts

This chapter explains properties, reactions, and uses of acids, bases, and salts.

Important Questions:

1. Explain why HCl is a strong acid.
2. What happens when zinc reacts with dilute sulphuric acid?
3. Why is baking soda used in fire extinguishers?
4. Write the chemical equation for the preparation of washing soda.
5. Name one salt used in our daily life and its importance.

Do Check: CBSE Class 10 Science Syllabus

Class 10 Science Chapter 3 Important Questions – Metals and Non-metals

1. Give one difference between metals and non-metals.
2. Explain why sodium is kept in kerosene.
3. What are alloys? Give two examples.
4. Write the chemical reaction of copper oxide with hydrogen.
5. Explain corrosion and ways to prevent it.

Class 10 Science Chapter 4 Important Questions – Carbon and Its Compounds

1. Why does carbon form covalent bonds?
2. Write the structure of ethanol.
3. Differentiate between saturated and unsaturated hydrocarbons.
4. What are homologous series?
5. State the reaction between ethanol and acetic acid.

Class 10 Science Chapter 5 Important Questions – Life Processes

This Biology chapter is very important for exams.

Important Questions:

1. Explain the process of photosynthesis.
2. What is peristalsis in digestion?
3. Differentiate between aerobic and anaerobic respiration.
4. Explain the process of double circulation in humans.
5. What are the functions of xylem and phloem?

Class 10 Science Chapter 6 Important Questions – Control and Coordination

1. What are hormones? Give examples.
2. Explain the function of the nervous system in humans.
3. Differentiate between voluntary and involuntary actions.
4. What is phototropism?
5. Name two plant hormones and their functions.

Class 10 Science Chapter 7 Important Questions – How Do Organisms Reproduce?

1. Define asexual reproduction. Give examples.
2. What is binary fission?
3. Explain fertilisation in humans.
4. State the function of placenta.
5. Write one difference between self-pollination and cross-pollination.

Do Check: CBSE Class 10 Science Notes

Class 10 Science Chapter 8 Important Questions – Heredity and Evolution

1. Define heredity.
2. What is variation? Why is it important?
3. Explain Mendel’s experiment on pea plants.
4. Differentiate between dominant and recessive traits.
5. Define natural selection.

Class 10 Science Chapter 9 Important Questions – Light: Reflection and Refraction

1. State the laws of reflection.
2. What is the focal length of a lens?
3. Draw the ray diagram for concave mirror when object is at infinity.
4. Define refractive index.
5. Write the lens formula.

Class 10 Science Chapter 10 Important Questions – Human Eye and Colourful World

1. What is persistence of vision?
2. Explain myopia and its correction.
3. What causes dispersion of white light?
4. Explain the structure of the human eye.
5. Why is the sky blue?

Class 10 Science Chapter 11 Important Questions – Electricity

1. State Ohm’s law.
2. Define resistance and its SI unit.
3. What happens when resistors are connected in parallel?
4. What is electric power?
5. Write the heating effect of current formula.

Class 10 Science Chapter 12 Important Questions – Magnetic Effects of Electric Current

1. State the right-hand thumb rule.
2. What is electromagnetic induction?
3. Define solenoid.
4. Explain the principle of an electric motor.
5. State Fleming’s left-hand rule.

Class 10 Science Chapter 13 Important Questions – Our Environment

1. Define ecosystem.
2. What are food chains and food webs?
3. State the importance of decomposers.
4. What is biological magnification?
5. Write two effects of ozone layer depletion.

Do Check: CBSE Class 10 Science Sample Papers

Benefits of Solving Class 10 Science Important Questions

Before moving to the chapter-wise list, let us first understand why solving science important question sets is useful:

1. Covers Key Topics – Important questions are selected from topics that are frequently asked in exams.
2. Boosts Confidence – Practicing them reduces exam fear and makes students exam-ready.
3. Improves Time Management – Writing answers repeatedly improves speed and accuracy.
4. Supports Revision – Students can revise all concepts quickly using important questions for class 10 science.

Science Important Question Paper Pattern & Marking Scheme

The CBSE Class 10 Science exam paper is designed in a way that checks both your understanding of concepts and your ability to write answers in a clear format. To prepare well, you must know the paper pattern and marking scheme. This is where solving 10th science important questions becomes very helpful because it gives you a clear idea of how questions are asked.

Paper Pattern Overview

The question paper is divided into three main sections:

1. Section A (1-mark questions)
   • These are very short answer type questions.
   • They can be multiple-choice questions (MCQs), fill in the blanks, or one-word answers.
   • Usually around 6–8 questions are asked in this section.
   • Example: State one difference between metals and non-metals.
   • To do well in this section, practice class 10 science important questions with answers from each chapter.
2. Section B (3-mark questions)
   • These are descriptive questions that require short explanations, diagrams, or chemical equations.
   • Generally, you can expect 10–12 questions here.
   • Example: Explain the process of photosynthesis with an equation.
   • These questions test your understanding of concepts and how you express them.
   • By solving important questions for class 10 science, you will cover most of these.
3. Section C (5-mark questions)
   • These are long-answer type questions.
   • They require detailed answers with explanations, diagrams, equations, and examples.
   • About 6–8 such questions appear in the paper.
   • Example: Explain the structure and function of the human eye with a neat diagram.
   • Practicing science important question sets will help you answer these effectively.

Marking Scheme

• The paper is of 80 marks in total. The remaining 20 marks come from internal assessments like practicals, projects, and periodic tests.
• Each section has a balanced weightage of questions from Physics, Chemistry, and Biology.
• Diagrams and equations carry marks – so even if your theory is short, correct diagrams/equations can earn full marks.
• Step marking is followed, which means you get marks for writing correct steps, even if the final answer is incomplete.

Do Check: NCERT Solutions for Class 10 Science

Why Practice 10th Science Important Questions for Paper Pattern?

• Helps identify the type of questions asked in each section.
• Builds speed in attempting MCQs and 1-mark questions.
• Improves answer-writing style for descriptive and long-answer questions.
• Ensures no topic is left out because important questions for class 10 science with answers are chosen from exam-relevant topics.

Tips to Prepare for Class 10 Science Exam

Preparing for the Class 10 Science exam can feel stressful, but with the right strategy, it becomes simple. Here are some practical tips to score high in Science:

1. Follow NCERT Strictly
   • Most CBSE exam questions come directly or indirectly from NCERT.
   • Read every line, practice in-text and back-exercise questions.
   • Many 10th science important questions are framed from NCERT itself.
2. Make Notes
   • Write down key formulas, reactions, definitions, and diagrams in a separate notebook.
   • These notes will help in last-minute revision.
   • Try to keep them chapter-wise (e.g., Class 10 Science Chapter 1 Important Questions in one place).
3. Solve Previous Year Papers
   • Many questions repeat in board exams with slight changes.
   • By solving past 5–10 years’ papers, you will see a clear pattern.
   • It also gives an idea of time management during the exam.
4. Practice Important Questions with Answers
   • Set aside time daily to solve important questions for class 10 science with answers.
   • Write full answers as you would in the exam, not just points.
   • This will train you in presenting your answers clearly.
5. Revise Daily
   • Instead of studying for long hours once a week, revise a little every day.
   • Revise diagrams, equations, and definitions regularly.
   • Go through science important question sets again and again to strengthen memory.