# CBSE Class 10 Revision Notes

## Class 10 Revision Notes

The Central Board of State Education (CBSE) conducts the final examination for Class 10, which is crucial in a student’s life because it helps them decide which stream they want to pursue in Class 11 and Class 12.

## Class 10 Revision Notes, Short Key Notes

CBSE Class 10 revision notes and key notes are available on Extramarks that cover all the important topics included in the syllabus. The CBSE revision notes summarise all the key concepts provided in each chapter in a simple and understandable manner. Last-minute preparations before an exam can be challenging and stressful. CBSE Class 10 revision notes help students in revising important concepts and boost their confidence before the exam. By revising these notes before Class 10 board exams, students can quickly brush up on all the concepts so that they don’t miss out on anything important from the exam point of view.

### CBSE Class 10 Revision Notes

Students can access the CBSE Class 10 Revision Notes on the Extramarks website to quickly revise important questions before the exam and score good marks.

### Class 10 Revision Notes

The following are the subjects that are covered in Class 10:

1. Mathematics
2. Science
3. Social Science
4. English
5. Hindi

### Class 10 Revision Notes

Revising throughout the chapters is one of the most effective ways to overcome the fear of board exams. Extramarks offers comprehensive Class 10 Revision Notes prepared by expert teachers for Mathematics, Science, Languages, Commerce, Physical Education, etc. These notes have been laid out in an easy-to-understand manner to help students score good marks in their board exams. Download the Class 10 Revision Notes available on Extramarks to revise quickly before the exam.

## Revision Notes for CBSE Class 10 Notes

Notes are essential for effective study and revision. It enables students to thoroughly understand all the concepts provided in every subject and revise important questions right before the exam without going through the whole chapter. Extramarks provides all of the revision notes that CBSE students require for last-minute revision. These revision notes cover all of the important key points from the NCERT textbooks.

### Class 10 Mathematics Revision Notes

• All rational and irrational numbers are called real numbers. All numbers from (…-3, -2, -1, 0, 1, 2, 3…) are called integers. Real numbers of the form p/q, q ≠ 0, p, q ∈ I are rational numbers. Counting numbers are called natural numbers.Zero along with all natural numbers are together called whole numbers. Natural numbers greater than 1 which are divisible by 1 and the number itself are called prime numbers.
• The name “polynomial” is derived from the words “poly” (meaning many) and “nominal” (meaning phrase)—so it means “many terms.”A polynomial is made up of solely added, subtracted, and multiplied terms.A quadratic polynomial in x with real coefficients is of the form ax² + bx + c, where a, b, c are real numbers with a ≠ 0.
• A Linear Equation is an equation of straight line. It is in the form of ax + by + c = 0. where a, b and c are the real numbers (a≠0 and b≠0) and x and y are the two variables. Here a and b are the coefficients and c is the constant of the equation.Two Linear Equations having two same variables are known as the pair of Linear Equations in two variables
• A polynomial, whose degree is 2, is called a quadratic polynomial. It is in the form of p(x) = ax2 + bx + c, where a ≠ 0. When we equate the quadratic polynomial to zero then it is called a Quadratic Equation i.e. if p(x) = 0, then it is known as Quadratic Equation.
• Except for the initial term, an Arithmetic Progression is a series of numbers in which each term is obtained by adding a specific number to the previous term.Each number in the sequence is known as term. The fixed number i.e. the difference between each term with its preceding term is known as a common difference. It can be positive, negative or zero. It is represented as ‘d’.
• Any polygon which has three sides and three vertices is known as a triangle.There are three types of Triangles on the basis of the length of the sides: acute,right and obtuse.There are three types of Triangles on the basis of angles:scalene, isosceles and equilateral.
• Trigonometry is used to determine distances and heights. It depicts the connection between the triangle’s sides and angles. It’s most commonly used in the situation of a right-angle triangle.
• Trigonometry can be used in many ways in the things around us like we can use it for calculating the height and distance of some objects without calculating them actually.
• A circle is a figure formed by all points that are at the same distance from a fixed point. The fixed point is referred to as the circle’s centre. The radius is the distance between any point on the circle and the fixed point. Chord is a line segment formed by linking any two points on the circle’s border. The radius is divided by two to get the diameter. It is the circle’s longest chord that crosses through the centre. The diameters are all the same length.
• If we have to divide a line segment in a particular ratio, then we can do it by measuring the length on the ruler and marking it on the line. But if we don’t have anything to measure then we can do it by using steps of construction.
• The outer boundary of the circle is the perimeter of the circle. The perimeter of a circle is also called the Circumference of the Circle. Circumference = 2πr = πd (π = 22/7), r = Radius and d = 2r, Area of the circle = πr2
• Surface Area is the area of the outer part of any 3D figure and Volume is the capacity of the figure i.e. the space inside the solid.If a solid is moulded by two or more than two solids then it needs to divide it into separate solids to calculate its surface area.
• Statistics is one of the parts of mathematics in which we study about the collecting, organising, analysing, interpreting and presenting data. Statistics is very helpful in real life situations as it is easy to understand if we represent data in a particular number which represents all numbers. This number is called the measure of central tendency.
• Probability is the study of mathematics which calculates the degree of uncertainty. There are two types of approaches to study probability-experimental probability and theoretical approach.

### Class 10 Science Revision Notes

Chemical reaction and equations chapter deals various kind of chemical reactions, Characteristics of chemical reactions which include these:

• Evolution of gas
• Change in Colour
• Change in state of substance
• Change in temperature
• Formation of precipitate

It also discusses chemical equations( balanced and unbalanced equations) and types of chemical reaction.

• Acids are sour in taste, turn blue litmus red, and dissolve in water to release H+ ions.Bases are bitter in taste, have soapy touch, turn red litmus blue and give hydroxide ions (OH–) in aqueous solution.Salts are the ionic compounds which are produced after the neutralisation reaction between acid and base. Salts are electrically neutral.
• Metals are the elements that conduct heat and electricity and are malleable and ductile. Examples are Iron (Fe), Aluminium (Al), Silver (Ag), Copper (Cu), Gold (Au), Platinum (Pt), Lead (Pb), Potassium (K), Sodium (Na).Metal oxides are basic in nature. The aqueous solution of metal oxides turns red litmus blue.
• The electron dot structure provides a picture of bonding in molecules in terms of the shared pairs of electrons and octet rule. Most of the organic compounds have low boiling and melting point, due to the weak force of attraction (i.e., the intermolecular force of attraction) between these molecules.
• The periodic table is a tabular method of displaying the elements in such a way that the elements having similar properties occur in the same vertical column or group.Dobereiner’s Triads is based on the atomic mass. According to this, when elements are arranged in order of increasing atomic masses, groups of three elements, having similar properties are obtained.
• The process by which an organism takes food and utilises it, is called nutrition.Materials which provide nutrition to organisms are called nutrients.The mode of nutrition in which an organism prepares its own food is called autotrophic nutrition. Green plants and blue-green algae follow the autotrophic mode of nutrition.The process by which green plants prepare food is called photosynthesis.
• In animals, the nervous system and hormonal system are responsible for control and coordination.The nervous system is composed of specialised tissues, called nervous tissue. The nerve cell or neuron is the functional unit of the nervous system. It is the nervous system which is mainly responsible for control and coordination in complex animals.
• Asexual reproduction:- l It only concerns one parent. There is no gamete formation or fusion. The newly generated cells are nearly similar to each other and to the parent cell. In sexual reproduction is the mode of reproduction that takes place with the involvement of two individuals of two different sexes i.e. male and female.
• The transmission of traits from parents to children is referred to as heredity. In humans, an inherited characteristic is a genetically determined feature that distinguishes one individual from another, such as connected or free earlobes.
• The phenomenon of bouncing back of light into the same medium by the smooth surface is called reflection.Light which falls on the surface is called incident light. Light which goes back after reflection is called reflected light.The surface which can reflect the light is a mirror.If the reflecting surface is a plane then the mirror is plane
• The human being  is a natural optical instrument which is used to see objects by human beings. It is like a camera which has a lens and screen system.
• The flow of electric charge is known as Electric Current, Electric current is carried by moving electrons through a conductor.Electric circuit is a continuous and closed path of electric current. A small quantity of electric current is expressed in milliampere and microampere. Milliampere is written as mA and microampere as pA.
• Magnetic field and magnetic field lines, Magnetic field due to a current carrying conductor, Right hand thumb rule, Magnetic field due to current through a circular loop. Magnetic field due to current in a solenoid.The area around a magnet where a magnetic force is experienced is called the magnetic field.
• A source of energy is that which is capable of providing enough useful energy at a steady rate over a long period of time.A Good source of energy should be safe and convenient to use, easy to transfer, easy to store.
• Biodegradable wastes are Substances that are broken down by biological processes. These substances are decomposed through the actions of fungi, bacteria, and other living organisms. Non-biodegradable wastes are Substances that are not broken down by biological processes. These substances may be in solid, liquid or gaseous form.
• On the basis of abundance and availability, the natural resources are of two types one Inexhaustible and other is Exhaustible.A system of controlling the use of natural resources in such a way, as to avoid their wastage and to use them in the most effective way is called management of natural resources.

## 1. Does the CBSE Board fail students in Class 10th?

CBSE has decided not to fail any student in the upcoming Class 10 and Class 12 board examinations

## 2. Is CBSE class 10th more difficult than ICSE class 10th?

ICSE class 10th syllabus is considered more difficult than CBSE class 10th syllabus.

## 3. What is the Mathematics class 10th syllabus for 2022?

Students should visit Extramarks to get a quick overview of the Mathematics syllabus for class 10. The website covers all the topics included in class 10th Mathematics syllabus.

## 4. How will Extramarks Revision Notes be useful to Class 10 students?

Extramarks Class 10 revision notes summarise key points of a chapter in an easy to understand and remember form. All the concepts are explained in a quick and efficient manner. The revision notes are prepared by expert teachers after reviewing examination papers of past years. Self-study is not enough to score good marks in class 10. Extramarks class 10 revision notes along with self-study will enable students to strengthen their concepts and gain more confidence during exams.

## 5. How many hours should I allocate to practise Mathematics in Class 10?

Mathematics is an important subject in class 10 as it lays a foundation for students who wish to pursue the Science stream in class 11 and 12. It is based on calculations and problem solving and requires a lot of practice. You should set aside at least 2-3 hours per day to practise Mathematics.