Question

What are the important topics for the 2020 CBSE board examination?

Answer 1

Answer:

For the CBSE 2020 Science examinations, I searched a lot on the internet and got some common topics which were described as 'Expected Topics'. They are:

Chemistry:

• Balancing the equations.
• Difference between combination reaction and decomposition reaction (with example).
• Difference between displacement reaction and double displacement reaction (with example).
• Difference between oxidation and reduction reactions.
• Physical factors required for rusting of iron.
• Why are oils used in pickles and why the chips are puffed with nitrogen gas.
• Reactions of acids and bases with metals, metal hydroxides, metal oxides, metal carbonates, metal hydrogen carbonates respectively.
• Explain universal indicator.
• Formation and uses of Bleaching powder, washing soda, baking soda, and POP.
• Extraction of metals.
• Thermit reaction
• Prevention of corrosion.
• Isomerism
• Tetravalency and catenation.
• Types of reactions(oxidation, addition, substitution)
• Properties of ethanol and ethanoic acid.
• Features of the periodic table designed by Dobereiner, Newlands, Mendeleev and the drawbacks.

Physics:

• Formation of image by convex lens, concave lens, convex mirror and concave mirror.
• Refraction through glass slab and prism.
• Numerical based on refractive index.
• Defects of eye.
• Reason for blue colour of sky.
• Why sun is red on sunset and sunrise.
• Tyndall effect
• Twinkling of stars.
• Formation of rainbow.
• Numerical of electricity.
• Heating effect of electric current.
• Properties of magnetic field lines.
• Rules (in magnetic effects of electric current)
• Electric motor, generator.
• Alternative sources of energy, and their disadvantage.

Biology:

• The chapters Reproduction and Heredity are very important, go through all the topics in those chapters.
• Process of nutrition and excretion.
• Haemodialysis
• Reflex action and arc.
• Hormones of plants and animals.
• 10% rule (our environment)

All the best for exam!!

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