Most Expected Questions for CBSE Class 10 Science 2026 Physics, Chemistry and Biology

Most Expected Questions for CBSE Class 10 Science 2026: With the Science board exam scheduled on 25 February, students appearing under CBSE are now in the crucial final revision phase. At this stage, focusing on most expected questions and high-weightage topics can make revision faster and more effective. These most important CBSE  class 10 science topics are repeatedly tested through numericals, diagrams, and case-based questions. Smart last-minute preparation helps strengthen concepts, reduce confusion, and improve answer accuracy. By targeting these areas, students can maximize marks with limited time.

Most Expected Questions for CBSE Class 10 Science 2026 Physics 

These topics have been frequently asked in the last several years in the CBSE Class 10 Science exam. Questions from this unit often appear in numerical, diagram-based, and competency formats. Strong preparation here can secure quick and reliable marks. Here are Most Expected Questions for CBSE Class 10 Science 2026 in physics:

Light: Reflection and Refraction

This is one of the most important and scoring chapters.

Very Important Questions

1. Derive the mirror formula and explain magnification.

2. Draw ray diagrams showing image formation by:

• Concave mirror (object beyond C, at C, between C and F)

• Convex mirror

3. Define focal length and radius of curvature. Write their relation.

4. Solve numerical problems using lens formula.

5. Explain sign convention for spherical mirrors and lenses.

6. Define power of a lens and its SI unit.

7. Distinguish between real and virtual images.

8. Why does a concave mirror form real images while a convex mirror always forms virtual images?

Case-based focus: Image formation in rear-view mirrors and magnifying glasses.

Human Eye and Colourful World

Expected Questions

1. Explain defects of vision:

• Myopia

• Hypermetropia

• Presbyopia

2. Draw labelled diagram of human eye.

3. Explain atmospheric refraction with examples.

4. Why does the sky appear blue?

5. Why does the sun appear reddish at sunrise and sunset?

6. What is scattering of light?

Electricity

Most Important Questions

1. State and explain Ohm’s Law.

2. Derive the formula for equivalent resistance in:

• Series combination

• Parallel combination

3. Define electric current, potential difference, and resistance.

4. Solve numerical problems based on:

• V = IR

• Electric power

• Heating effect of current

5. Explain factors affecting resistance.

6. Explain household electric circuit and safety devices (fuse, MCB).

7. Distinguish between electric energy and electric power.

Numerical practice from this chapter is essential.

Magnetic Effects of Electric Current

High Probability Questions

1. State Fleming’s Left Hand Rule.

2. Explain working of electric motor with diagram.

3. Draw magnetic field lines around a straight conductor.

4. Explain domestic electric circuit safety measures.

5. What is electromagnetic induction?

6. Difference between AC and DC current.

Sources of Energy

Frequently Asked Questions

1. Conventional vs non-conventional energy sources.

2. Advantages of renewable energy.

3. Environmental impact of thermal power plants.

4. Working principle of solar cells.

5. Why is wind energy considered eco-friendly?

Most Expected Questions for CBSE Class 10 Science 2026 Chemistry

The concepts in this section have shown consistent repetition in previous board papers. Many questions are asked in application-based and reaction-writing format, making them important for scoring well in the final exam. Below given most expected questions for CBSE Class 10 Science 2026 from chemistry:

Chemical Reactions and Equations

Most Expected Questions

1. Balance the following chemical equations.

2. Types of chemical reactions with examples:

• Combination

• Decomposition

• Displacement

• Double displacement

3. Define oxidation and reduction with examples.

4. Explain corrosion and methods to prevent it.

5. What is rancidity? How can it be prevented?

Acids, Bases and Salts

Very Important Questions

1. Define acids and bases according to Arrhenius concept.

2. Explain pH scale and its importance.

3. Chemical properties of acids and bases.

4. Preparation and uses of:

• Bleaching powder

• Baking soda

• Washing soda

5. Why should acids be diluted carefully?

6. Explain neutralization reaction.

Metals and Non-metals

Important Questions

1. Properties of metals and non-metals.

2. Explain ionic bonding with example.

3. Reactivity series of metals.

4. Extraction of metals from ores.

5. Corrosion and prevention methods.

6. Why do ionic compounds have high melting points?

Carbon and Its Compounds

Most Important Questions

1. Explain covalent bonding with diagram.

2. Define homologous series.

3. Functional groups and their identification.

4. Properties and uses of ethanol and ethanoic acid.

5. Formation of soap and its cleansing action.

6. Difference between soap and detergent.

Periodic Classification of Elements

Expected Questions

1. State Modern Periodic Law.

2. Trends in periodic table:

• Atomic size

• Valency

• Metallic character

3. Why do elements in the same group show similar properties?

Metals and Non-Metals

Expected Questions

1. What is galvanization? How does it prevent rusting?

2. Name the ore of iron and aluminum.

3. Why is graphite a good conductor of electricity?

4. How are highly reactive metals extracted?

Most Expected Questions for CBSE Class 10 Science 2026 Biology 

Biology topics listed below are regularly tested through theory, diagrams, and case-study questions. These chapters carry high weightage and are considered predictable scoring areas in recent CBSE exams. Here are most expected questions for CBSE Class 10 Science 2026 in biology: 

Life Processes (Most Important Chapter)

Expected Questions

1. Explain nutrition in human beings.

2. Describe photosynthesis process with equation.

3. Transportation in plants (xylem and phloem).

4. Human respiratory system with diagram.

5. Structure and function of heart.

6. Structure of nephron and excretion process.

Diagrams must be practiced carefully.

Control and Coordination

Expected Questions

1. Structure and functions of neuron.

2. Reflex action with diagram.

3. Role of hormones in human body.

4. Difference between nervous and hormonal control.

5. Plant hormones and their functions.

How Do Organisms Reproduce

High Probability Questions

1. Difference between sexual and asexual reproduction.

2. Male and female reproductive system diagrams.

3. Fertilization and development.

4. Importance of reproductive health.

Heredity and Evolution

Important Questions

1. Mendel’s experiments and laws.

2. Dominant and recessive traits.

3. Genotype vs phenotype.

4. Sex determination in humans.

Our Environment

Expected Questions

1. Food chain and trophic levels.

2. Ozone layer depletion.

3. Biodegradable and non-biodegradable waste.

4. Environmental problems and solutions.

Last-Minute Revision Strategy for CBSE Class 10 Science 2026

CBSE Class 10 Science topics have been frequently asked in recent years in CBSE exams and cover high-weightage concepts. Focusing on them in the final days helps strengthen fundamentals, improve speed, and reduce exam stress.

• Revise NCERT diagrams, formulas, and definitions daily.

• Practice 1–2 previous year papers in timed conditions.

• Focus on Electricity, Light, Carbon Compounds, and Life Processes.

• Memorize key chemical reactions and ray diagrams.

• Avoid new topics — revise what you already know well.