Some Important Questions for Class 10 Science (CBSE)

Here are some important questions for Class 10 Science (CBSE) that cover key topics from the syllabus.

These questions are based on previous years’ exam patterns and frequently asked topics:

● Physics

1. Electricity
– Derive the expression for the equivalent resistance of three resistors connected in series and parallel.
– State Ohm’s law. Draw a circuit diagram to verify Ohm’s law.
– Explain the heating effect of electric current and derive the expression for heat produced.

2. Magnetic Effects of Electric Current
– Explain the working of an electric motor with a labeled diagram.
– What is electromagnetic induction? State Faraday’s law of electromagnetic induction.
– Describe the construction and working of an AC generator.

3. Light – Reflection and Refraction
– Derive the mirror formula and lens formula.
– Explain the refraction of light through a glass slab and a triangular prism.
– What is the power of a lens? Define its SI unit.

● Chemistry

4. Chemical Reactions and Equations
– Balance the following chemical equation and identify the type of reaction:
3Fe + 4H2O —–Fe3O4 + 2H2

– Explain the process of corrosion and rancidity with examples.

5. Acids, Bases, and Salts
– What is a neutralization reaction? Give an example.
– Explain the pH scale and its importance in everyday life.
– How is washing soda (Na₂CO₃·10H₂O) prepared from sodium chloride?

6. Metals and Non-Metals
– Explain the reactivity series of metals and its applications.
– Describe the extraction of metals from their ores (e.g., extraction of iron).
– Why do metals conduct electricity, whereas non-metals do not?

● Biology

7. Life Processes
– Explain the process of photosynthesis and write its chemical equation.
– Describe the human digestive system with a labeled diagram.
– What is the role of the diaphragm and ribs in respiration?

8. Control and Coordination
– Explain the structure and function of the human brain.
– What are hormones? Describe the role of insulin in the human body.
– Compare the nervous system and endocrine system.

9. Heredity and Evolution
– Explain Mendel’s laws of inheritance with an example.
– What is speciation? Explain the factors responsible for speciation.
– Describe the evidence for evolution.

10. Our Environment
– Explain the flow of energy in an ecosystem.
– What is the ozone layer? How is it getting depleted?
– Describe the role of decomposers in the environment.

Tips for Preparation:

– Focus on NCERT textbooks as they are the primary source for CBSE exams.
– Practice numerical problems in Physics and Chemistry.
– Revise diagrams and their labeling for Biology.
– Solve previous years’ question papers and sample papers.

Good luck with your preparation!