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CBSE Class 10th Science Syllabus 2020-21 and Past Papers (Code No. 086/090)

By SchoolMyKids Expert|9 - 10 mins read| February 15, 2023

Class X Science Syllabus 2020-21.  Check out CBSE Class 10th Science Syllabus, CBSE Class 10th  Science Previous year question papers, CBSE Class 10th  Science Sample Papers. Check out CBSE Class 10th Syllabus and Past Papers of other CBSE Class 10th Course CBSE Class 10th Science Syllabus 2020-21 and Past PapersCBSE Class 10th Mathematics Syllabus 2020-21 and Past Papers, CBSE Class 10th English Language And Literature Syllabus 2020-21 and Past Papers, CBSE Class 10th English Communicative Syllabus 2020-21 and Past Papers, CBSE Class 10th Social Science Syllabus 2020-21 and Past Papers or check out CBSE Class 10th Previous Year Question Papers and Sample Papers Solved. Continue to read for CBSE Class 10th Syllabus  Science.


The board examination will be of 80 Marks.

Unit No.UnitMarks
IChemical Substances – Nature and Behaviour25
IIWorld of Living23
IIINatural Phenomena12
IVEffects of Current13
VNatural Resources07
 Internal assessment20
 Grand Total100

Note : Above weightage includes the weightage of questions based on practical skills.

Science Exam Paper Format and Syllabus 2020-21

Theme : Materials

Unit I : Chemical Substances – Nature and Behaviour                        

(Suggested number of Periods : 55 Periods)

Chemical reactions : Chemical equation, Balanced chemical equation, implication of a balanced chemical equation, types of chemical reactions : Combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.

Acids, bases and salts : Their definitions in terms of furnishing of H+ and OH- ions, General properties, examples and uses, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris.

Metals and nonmetals : Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds; Basic metallurgical processes; Corrosion and its prevention.

Carbon compounds : Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series. Nomenclature of carbon compounds containing functional groups (halogens, alcohol, ketones, aldehydes, alkanes and alkynes), difference between saturated hydrocarbons and unsaturated hydrocarbons. Chemical properties of carbon compunds (combustion, oxidation, addition and substitution reaction). Ethanol and Ethanoic acid (only properties and uses), soaps and detergents.

Periodic classification of elements : Need for classification, Early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.

Theme : The World of the Living

Unit II : World of Living

( Suggested number of Periods: 50 Periods)

Life processes : ‘Living Being’. Basic concept of nutrition, respiration, transport and excretion in plants and animals.

Control and co-ordination in animals and plants : Topic movements in plants; Introduction of plant hormones; Control and co-ordination in animals; Nervous system; Voluntary, involuntary and reflex action; Chemical co-ordination: animal hormones.

Reproduction : Reproduction in animals and plants (asexual and sexual) reproductive health-need and methods of family planning. Safe sex vs HIV / AIDS. Child bearing and women’s health.

Heredity and Evolution : Heredity; Mendel’s contribution – Laws for inheritance of traits : Sex determination : brief introduction; Basic concepts of evolution.

Theme : Natural Phenomena

Unit III : Natural Phenomena

(Suggested number of Periods: 23 Periods)

Reflection of light by curved surfaces; Images formed by spherical mirrors, centre of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required), magnification.

Refraction; Laws of refraction, refractive index.

Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula (Derivation not required); Magnification. Power of a lens.

Functioning of a lens in human eye, defects of vision and their corrections, applications of spherical mirrors and lenses.

Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life.

Theme : How Things Work

Unit IV : Effects of Current                                                                     

(suggested number of periods: 32 Periods)

Electric current, potential difference and electric current. Ohm’s law; Resistance, resistivity, Factors on which the resistane of a conductor depends. Series combination of resistors, parallel combination of resistors and its applications in daily life. Heating effect of electric current and its applications in daily life. Electric power, Interrelation between P, V, I and R.

Magnetic effects of current : Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Electric Motor, Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule, Electric Generator, Direct Current. Alternating current : frequency of AC.

Advantage of AC over DC. Domestic electric circuits.

Theme : Natural Resources

Unit V : Natural Resources 

(Suggested Number of Periods: 20 Periods)

Sources of energy : Different forms of energy, conventional and non-conventional sources of energy : Fossil fuels, solar energy; biogas; wind, water and tidal energy; Nuclear energy. Renewable versus non-renewable sources of Energy.

Out environment : Eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.

Management of natural resources : Conservation and judicious use of natural resources. Forest and wild life; Coal and Petroleum conservation. Examples of people’s participation for conservation of natural resources. Big dams: advantages and limitations; alternatives, if any. Water harvesting. Sustainability of natural resources.

CBSE Class 10th Science Practicals 2020-21

Practicals should be conducted alongside the concepts taught in theory classes.


  1. Finding the pH of the following samples by using pH paper / universal indicator:
    1. Dilute Hydrochloric Acid
    2. Dilute NaOH solution
    3. Dilute Ethanoic Acid Solution
    4. Lemon juice
    5. Water
    6. Dilute Hydrogen Carbonate solution
  2. Studying the properties of acids and bases (HCl & NaOH) by their reaction with:
    1. Litmus solution (Blue/Red)
    2. Zinc metal
    3. Solid sodium carbonate
  3. Performing and observing the following reactions and classifying them into :
    1. Combination reaction
    2. Decomposition reaction
    3. Displacement reaction
    4. Double displacement reaction
      1. Action of water on quick lime
      2. Action of heat on ferrous sulphate crystals
      3. Iron nails kept in copper sulphate solution
      4. Reaction between sodium sulphate and barium chloride solutions
  4. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions:
    1. ZnSO4 (aq)
    2. FeSO4 (aq)
    3. CuSO4 (aq)
    4. Al2 (SO4)3 (aq)
    5. Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result.
  5. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determine its resistance. Also plotting a graph between V and I.
  6. Determination of the equivalent resistance of two resistors when connected in series and parallel.
  7. Preparing a temporary mount of a leaf peel to show stomata.
  8. Experimentally show that carbon dioxide is given out during respiration.
  9. Study of the following properties of acetic acid (ethanoic acid) :
    1. odour
    2. solubility in water
    3. effect on litmus
    4. reaction with sodium Hydrogen Carbonate
  10. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.
  11. Determination of the focal length of :
    1. Concave mirror
    2. Convex lens  by obtaining the image of a distant object.
  12. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result.
  13. Studying (a) binary fission in Amoeba, and (b) budding in yeast with the help of prepared slides.
  14. Tracing the path of the rays of light through a glass prism.
  15. Finding the image distance for varying object distances in case of a convex lens and drawing corresponding ray diagrams to show the nature of image formed.
  16. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean).

CBSE Class X Science Prescribed Books

  • Science – Textbook for class IX – NCERT Publication
  • Science – Textbook for class X – NCERT Publication
  • Assessment of Practical Skills in Science – Class IX – CBSE Publication
  • Assessment of Practical Skills in Science – Class X – CBSE Publication
  • Laboratory Manual – Science – Class IX, NCERT Publication
  • Laboratory Manual – Science – Class X, NCERT Publication
  • Exemplar Problems – Clss IX – NCERT Publication
  • Exemplar Problems Class X – NCERT Publication

CBSE Class 10th Science Question Paper Format And Design

Total duration of the board examination is 3 Hours and the exam will be Max. Marks : 80




Typology of Questions Very Short Answer (VSA) 1 Mark Short Answer – I (SAI) 2 Marks Short Answer – II (SAII) 3 Marks Long Answer (LA) 5 Marks Total Marks % Weight age
1 Remembering (Knowledge based simple recall questions, to know specific facts, terms, concepts, principles, or theories, Identify, define or recite, information) 2 1 1 10 15%
2 Understanding (Comprehension – to be famillar with meaning and to understand conceptually, interpret, compare, contrast, explain, paraphrase, or interpret information) 1 4 2 24 35%
3 Application (Use abstract information in concrete situation, to apply knowledge to new situations, use given content to interpret a situation, provide an example or solve a problem) 1 2 2 18 26%
4 High Order Thinking Skills (Analysis & Synthesis –


Classify, compare, contrast or differentiate between different pleces of information, organize and / or integrate unique pieces of information from a variety of sources)

1 1 8 12%
5 Inferential      and      Evaluative


(Appraise, judge and / or justify the value or worth of a decision or outcome, or to predict outcomes based on values)

1 1+1* 8 12%
  Total (Theory Based Questions) 2×1=2 3×2=6 10×3=30 6×5=30 68(21) 100%
  Practical Based Questions (PBQs)   6×2=12 12(6)  
  Total 2×1=2 9×2=18 10×3=30 6×5=30 80(27)  
  1. Question paper will consist of 27 questions.
  2. All questions would be compulsory. However, an internal choice will be provided in three questions of 3 marks each, two questions of 5 marks each and one question (for assessing the practical skills) of 2 marks.
Periodic Table of Elements

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Last Updated: Wed Feb 15 2023

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