Class 10 Science can be one of the most interesting and scoring subjects — if studied smartly. In this article, we bring you the most important questions for Class 10 Science chapter-wise, along with accurate and easy-to-remember answers. These questions are selected based on the latest CBSE pattern, previous year board papers, and NCERT focus areas.
Practice these regularly to strengthen your concepts, improve your answer-writing skills, and boost your confidence before the exam.
Table of Contents
- Chemical Reactions and Equations
- Acids, Bases and Salts
- Metals and Non-Metals
- Carbon and Its Compounds
- Life Processes
- Control and Coordination
- Electricity
- Magnetic Effects of Electric Current
- Our Environment
- Sustainable Management of Natural Resources
1. Chemical Reactions and Equations
Question: Write the balanced chemical equation for the reaction of zinc with dilute hydrochloric acid. What type of reaction is this?
Answer: Zn + 2HCl → ZnCl₂ + H₂ ↑
This is a displacement reaction and also an example of a redox reaction.
2. Acids, Bases and Salts
Question: What is baking soda chemically? How does it work in baking?
Answer: Baking soda is sodium hydrogen carbonate (NaHCO₃). When heated, it releases CO₂, which makes the dough rise.
3. Metals and Non-Metals
Question: Why do metals conduct electricity but non-metals do not?
Answer: Metals have free electrons (delocalized) that allow electric current to pass, while non-metals lack these free electrons.
4. Carbon and Its Compounds
Question: Write the electron dot structure of methane. Name its bonds.
Answer:
Methane (CH₄) has four single covalent bonds between carbon and hydrogen atoms.
Dot Structure:
H:• •:H
C
H:• •:H
5. Life Processes
Question: Explain the process of digestion in humans.
Answer:
Digestion starts in the mouth with saliva, continues in the stomach with pepsin and HCl, and ends in the small intestine with enzymes and bile. Nutrients are absorbed into blood through villi.
6. Control and Coordination
Question: Differentiate between reflex action and voluntary action.
Answer:
Reflex actions are quick, involuntary responses controlled by the spinal cord. Voluntary actions are conscious and controlled by the brain.
7. Electricity
Question: State Ohm’s law. Derive the formula to calculate resistance.
Answer:
Ohm’s law: V = IR
Resistance R = V/I, where V is voltage, I is current.
8. Magnetic Effects of Electric Current
Question: What is a solenoid? Give its use.
Answer:
A solenoid is a coil of wire that produces a magnetic field when current passes through it. It is used in electromagnets and electric bells.
9. Our Environment
Question: What is biomagnification?
Answer:
Biomagnification is the accumulation of toxic substances (like DDT) in organisms higher up the food chain. It affects top predators the most.
10. Sustainable Management of Natural Resources
Question: Why should we conserve forests and wildlife?
Answer:
Forests maintain ecological balance, prevent soil erosion, support biodiversity, and regulate climate. Conservation ensures availability for future generations.
How to Revise Science Effectively
- Revise NCERT definitions and examples daily
- Draw and label diagrams (e.g., digestive system, electric circuit)
- Practice numerical questions from Physics chapters
- Highlight keywords in long answers
- Use flashcards for chemical formulas and scientific terms
Download Class 10 Science Sample Papers
Science is Not Tough — It’s Logical
Students often fear science, but it is based on logic and observation. Once concepts are clear, it becomes one of the easiest and most scoring subjects. Regular revision of these important questions for Class 10 Science will give you the confidence to attempt all sections of the paper with ease.
Conclusion
We hope this list of Class 10 Science important questions with answers helps you prepare better for your board exam. Make a study plan, revise daily, and don’t skip diagrams and experiments.
Remember, Science is all around you. Observe, understand, and apply. All the best!