Crucial Topics of Science Class 10 (CBSE)

Crucial Topics of Science Class 10

This article contains all the crucial topics of Science for class 10. We are assuming that you have read the entire book of Science and want to give one shot revision to all the important topics of Science. And even if you have still not completed your syllabus, they also don't worry, this article is for you also because it will let you know the frequently asked topics.   

Note: This article only considers the latest revised syllabus which was issued by CBSE for the 2020-21 board exams.

Before we start, let's read a wonderful quote which says, "The genius in something, was once a beginner"

With this, let's start with Physics. Physics contains four chapters (as per the revised syllabus) namely Light, Colorful world (human eye part is deleted), Electricity as well as magnetic effects of electric current (in which every topic after electromagnetic induction are deleted).

Let's start with 'Light'.  

Important topics are:

(a). Ray diagrams of both mirrors and lenses.

(b). Both mirror and lens formulae.

The second chapter is 'colorful world', frankly telling that all the phenomena in that chapter are super important. CBSE asks questions from any of the one or two phenomena.

The third one is 'Electricity'.

Important topics are:

(a). Ohm's law

(b). Series & Parallel

Last but not the least, 'magnetic effects of electric current'.

Important topics are:

(a). Properties of magnetic field lines.

(b). Maxwell's corkscrew rule.

(c). Fleming's left-hand rule.

(d). Fleming's right-hand rule.

We have reached the end of Physics here...

Now let's talk about Chemistry. Chemistry contains five chapters namely chemical reactions and equations, acids, bases & salts, metals and non-metals, carbon and its compounds, and periodic classification of elements.

Taking the first chapter i.e. 'chemical reactions and equations'.

Important topics are:

(a). Balancing equations.

(b). Displacement reaction.

(c). Double displacement reaction.

Acids, bases & salts.

Important topics are:

(a). Chemical properties of acids, bases & salts.

(b). pH scale and its applications.

(c). All about salts.

Metals and non-metals.

Important topics are:

(a). Chemical properties of metals.

(b). Reactivity series.

(c). Ionic bonding and its properties.

Note: The topic 'occurrence of metals' has been deleted in this chapter.

Carbon and its compounds.

Important topics are:

(a). Covalent bonding and its properties.

(b). Versatile nature of carbon.

(c). Homologous series.

Note: Nomenclature and chemical properties of carbon compounds have been deleted.

Periodic classification of elements.

Important topics are:

(a). All about Mendeleev's periodic table.

(b). The modern periodic table.

Thus, we've reached the end of Chemistry as well.

Considering about Biology now. Biology has 5 chapters (as per the revised syllabus) namely life processes, how do organisms reproduce, heredity (evolution is deleted), and our environment.

Life processes: Kindly do not leave any topic, everything is equally important in it.

How do organisms reproduce?

Important topics are:

(a). Asexual reproduction.

(b). Sexual reproduction.

(c). Reproductive health.

(d). Contraceptives.


Important topics are:

(a). Monohybrid cross.

(b). Sex determination.

Our environment.

Important topics are:

(a). Food chain and webs.

(b). Ozone layer's depletion.