Rajasthan Board Class 10 Science Marks Weightage 2027 - RBSE Chapter Wise

In short: Rajasthan Board RBSE Class 10 Science 2027 carries 80 marks in theory and 20 marks in internal assessment. The syllabus follows NCERT with 13 chapters across 5 units. Chemical Substances and World of Living carry 25 marks each, covering more than 60% of the paper. RBSE is moving toward a twice-a-year exam system starting 2027. Focus on Life Processes, Chemical Reactions, Acids Bases and Salts, Electricity, and Light for the best results.

RBSE Science 2027: What You Need to Know

Rajasthan Board of Secondary Education (RBSE) follows the NCERT syllabus for Class 10 Science. This means the 13 chapters and 5 units are the same as CBSE. However, the question paper format and marking scheme may differ slightly from CBSE.

A major change for 2027 is that RBSE is planning to introduce a twice-a-year examination system. This means students will get two attempts at the board exam, and the better score will be counted. Check the latest RBSE circular for confirmation on the exact implementation date.

The RBSE Science paper is available in both Hindi and English medium. Most students in Rajasthan write in Hindi medium, but the content and marks distribution remain the same.

Overall Paper Structure

Question Paper Format

Unit-Wise Marks Breakdown

Unit 1: Chemical Substances - Nature and Behaviour (25 Marks)

This is the highest-weightage unit, carrying 25 out of 80 marks.

Chapter 1: Chemical Reactions and Equations (8-10 marks)

• Types of reactions: combination, decomposition, displacement, double displacement, oxidation-reduction.
• Balancing chemical equations.
• Corrosion and rancidity as real-life examples.

This chapter appears in every paper. Expect MCQs on identifying reaction types, short answers on balancing equations, and long answers explaining different reaction types with examples. Make a master list of all important reactions and practice balancing them.

Chapter 2: Acids, Bases and Salts (8-10 marks)

• Properties of acids and bases using indicators.
• pH scale and its everyday applications.
• Preparation and properties of important salts: baking soda, washing soda, plaster of Paris, bleaching powder.

Another guaranteed high-scoring chapter. Know the chemical names, formulae, and preparation methods of all five important salts. pH-related questions appear as MCQs and short answers.

Chapter 3: Metals and Non-Metals (7-8 marks)

• Physical and chemical properties of metals and non-metals.
• Reactivity series and its applications.
• Extraction of metals from ores.
• Ionic compounds and their properties.

The reactivity series is essential. Know which metals react with cold water, hot water, and steam. Extraction methods (electrolysis for reactive metals, reduction for moderately reactive, and physical methods for least reactive) are a common 5-mark question.

Unit 2: World of Living (25 Marks)

Equal to Unit 1 in weightage, this unit covers the major Biology chapters.

Chapter 5: Life Processes (10-12 marks)

• Nutrition: autotrophic (photosynthesis) and heterotrophic (human digestion).
• Respiration: aerobic and anaerobic pathways.
• Transportation: heart, blood vessels, xylem, and phloem.
• Excretion: kidneys, nephron structure, and urine formation.

The most important single chapter in the paper. Expect one 5-mark question with a diagram (human heart, nephron, or digestive system) and several MCQs. Practice all major diagrams at least 5 times each.

Chapter 8: How Do Organisms Reproduce (6-8 marks)

• Asexual reproduction: fission, budding, fragmentation, regeneration, vegetative propagation, spore formation.
• Sexual reproduction in flowering plants: flower structure, pollination, fertilization.
• Human reproductive system and reproductive health.

Diagrams of the flower (longitudinal section) and human reproductive organs appear regularly.

Chapter 9: Heredity and Evolution (5-7 marks)

• Mendel's contribution: monohybrid cross and the 3:1 ratio.
• Sex determination using XX-XY chromosomes.
• Evolution: acquired vs inherited traits, homologous and analogous organs.

The Punnett square for a monohybrid cross is a guaranteed question. Practice explaining the 3:1 phenotypic ratio clearly.

Unit 3: Natural Phenomena (12 Marks)

Chapter 10: Light - Reflection and Refraction (7-8 marks)

• Laws of reflection and refraction.
• Mirror formula (1/v + 1/u = 1/f), lens formula (1/v - 1/u = 1/f).
• Ray diagrams for concave/convex mirrors and lenses.
• Magnification.

This chapter has the most numericals in the paper. Practice at least 30 problems on mirror formula and lens formula. Always draw ray diagrams using a ruler and label the focal point, center of curvature, and principal axis.

Chapter 11: Human Eye and the Colourful World (4-5 marks)

• Structure of the human eye.
• Defects of vision: myopia, hypermetropia, presbyopia, and their correction.
• Dispersion, atmospheric refraction, and scattering of light.

The diagram showing correction of myopia and hypermetropia using lenses is a popular question.

Unit 4: Effects of Current (13 Marks)

Chapter 12: Electricity (8-9 marks)

• Ohm's Law and its verification.
• Resistance: factors affecting resistance, series and parallel combinations.
• Electric power (P = VI) and energy (E = Pt).
• Heating effect of current.

Numericals are the key to scoring in this chapter. Practice problems on Ohm's Law, equivalent resistance, and power calculations. Draw neat circuit diagrams for every numerical problem.

Chapter 13: Magnetic Effects of Electric Current (4-5 marks)

• Magnetic field due to a current-carrying conductor.
• Fleming's Left Hand Rule (for force on conductor) and Right Hand Rule (for induced current).
• Electric motor and AC generator.

Diagrams of the electric motor and generator with labelled parts carry 3-5 marks.

Unit 5: Natural Resources (5 Marks)

Chapter 15: Our Environment (5 marks)

• Ecosystem, food chains, and food webs.
• 10% energy transfer rule.
• Biodegradable and non-biodegradable waste.
• Ozone layer and its depletion.

Straightforward chapter with easy theory questions. Learn the concepts and a few examples, and you can score full marks with minimal effort.

The Priority Matrix

Tier 1 (50% study time): Chemical Reactions, Acids Bases Salts, Life Processes, Electricity, Light = together 41-49 marks

Tier 2 (30% study time): Metals Non-Metals, Reproduction, Heredity, Magnetic Effects = 20-28 marks combined

Tier 3 (15% study time): Human Eye, Our Environment = 9-10 marks combined

Tier 4 (5% study time): Management of Natural Resources (if in syllabus) = 0-2 marks

Study Time Allocation

If you have 45 days before the RBSE exam:

• Chemistry (Unit 1, 3 chapters): 10 days
• Biology (Unit 2, 3 chapters): 10 days
• Physics - Light and Electricity (Units 3-4): 10 days
• Physics - Magnetic Effects + Human Eye: 4 days
• Our Environment + revision: 4 days
• Previous year papers and model papers: 7 days

If RBSE implements the twice-a-year system, you can attempt the first sitting with thorough preparation of Tier 1 chapters and improve in the second sitting after covering remaining chapters.

Common Mistakes That Cost Marks

1. Not reading NCERT line by line. RBSE questions come directly from NCERT. Even the MCQ options are lifted from textbook sentences. Read every paragraph, including the boxes and activities.
2. Ignoring the Hindi medium textbook nuances. If you are writing in Hindi, make sure you use the correct Hindi technical terms (like "apatvartan" for refraction). Using English terms in a Hindi-medium paper may not always get full marks.
3. Skipping numericals in Physics. Chapters 10 and 12 together carry about 15-17 marks, and at least half of those marks are numerical. Practice 30+ numericals from each chapter.
4. Writing long paragraphs instead of points. RBSE marking schemes award marks per point. Structure your 3-mark and 5-mark answers with numbered points.
5. Not practicing diagrams. Biology and Physics diagrams together carry 10-15 marks. An unlabelled or poorly drawn diagram gets partial marks at best.

Scoring Strategy

Target for 65+ out of 80:

With 16-18 marks from internal assessment, your total would be 81-83 out of 100.

For broader RBSE preparation, check out our Rajasthan Board Class 10 Maths chapter-wise marks weightage and the Rajasthan Board Class 10 guide.

Frequently Asked Questions

What is the RBSE Class 10 Science exam pattern for 2027?

The RBSE Science paper is 80 marks theory with 20 marks internal assessment, totaling 100. The theory paper has sections for MCQs (20 marks), very short answers, short answers (3 marks), long answers (5 marks), and diagram-based questions. The syllabus follows NCERT with 13 chapters across 5 units.

Is RBSE introducing twice-a-year exams in 2027?

RBSE has announced plans for a twice-a-year examination system where students get two attempts, and the better score is counted. Check the latest RBSE circular for the exact implementation date for 2027. If implemented, this gives you a second chance to improve your score.

Which unit carries the most marks in RBSE Science?

Unit 1 (Chemical Substances) and Unit 2 (World of Living) carry 25 marks each. Together, they account for 50 out of 80 marks, which is more than 60% of the theory paper. These two units should be your top priority during preparation.

Is the RBSE Science syllabus the same as CBSE?

Yes. RBSE follows the NCERT syllabus, which means the 13 chapters and 5 units are the same as CBSE. The marks distribution across units is also very similar (25-25-12-13-5). However, the question paper format may differ slightly, with RBSE having its own pattern for objective and descriptive sections.

How should I prepare for RBSE Science in Hindi medium?

Study from the Hindi medium NCERT textbook as your primary source. Learn all technical terms in Hindi (for example, "pranali" for system, "vidhyut dhara" for electric current). Write practice answers in Hindi to build fluency. For numericals, the process is the same regardless of medium, just write the final answer statement in Hindi.

Start Practicing on Padhaao

10 learning modes available. 3 free chapters every day. No download needed.

Start learning Rajasthan Board Science for free →