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Notes Class 12 Chemistry Chapter 6 Isolation of Elements

Notes For All Chapters Chemistry Class 12 1. Minerals: The natural substance in which the metals or their compounds occur in the earth is called minerals. 2. Ores: The minerals from which the metals can be conveniently and economically extracted are called ores. 3. Native ores: These ores contain metals in the free state, e.g., silver, gold, platinum, […]

Notes Class 12 Chemistry Chapter 5 Surface Chemistry

Notes For All Chapters Chemistry Class 12 1. This phenomenon of attracting and retaining the molecules of a substance by a solid (or a liquid) on its surface resulting into a higher concentration of the molecules on the surface is known as adsorption. 2. The substance that is adsorbed is called adsorbate and the substance which adsorbs is called adsorbent. 3. Desorption is […]

Notes Class 12 Chemistry Chapter 3 Chemical Kinetics

Notes For All Chapters Chemistry Class 12 CBSE 1. Chemical kinetics is the branch of chemistry which deals with the study of rates (or fastness) of chemical reactions, the factors affecting it and the mechanism by which the reactions proceed. 2. Rate of reaction is the change in concentration of reactants or products per unit time. For […]

Notes Class 12 Chemistry Chapter 2 Electro chemistry

Notes For All Chapters Chemistry Class 12 CBSE 1. Electrochemistry is the branch of chemistry which deals with the relationship between electrical energy and chemical energy and inter-conversion of one form into another. 2. An electrochemical cell consists of two metallic electrodes dipped in electrolytic solutions. The cells are of two types: (a) Electrolytic cells (b) Galvanic […]

Notes Class 12 Chemistry Chapter 1 Solutions

Notes For All Chapters Chemistry Class 12 CBSE 1. A solution is a homogeneous mixture of two or 9. more chemically non-reacting substances. The components of a solution generally cannot be separated by filtration, settling or centrifuging. 2. A solution may be classified as solid, liquid or a gaseous solution. 3. Solubility is defined as the amount of […]

Notes Class 12 Chemistry Chapter 1 The Solid State

Notes For All Chapters Chemistry Class 12 1. Solids are substances which have fixed shape and volume. 1’hey are characterised by rigidity, incompressibility, slow diffusion and mechanical strength. They are classified as: (a) Crystalline solids (b) Amorphous solids . 2. The crystalline solids are further classified as: (a) Metallic solids (b) Ionic solids (c) Covalent solids (d) […]

Notes Class 12 Physics CBSE

Electric Charges and Fields Notes Chapter 1 Physics  Class 12 Electrostatic Potential and Capacitance Notes Chapter 2 Physics  Class 12 Current Electricity Notes Chapter 3 Physics  Class 12 Moving Charges and Magnetism Notes Chapter 4 Physics   Class 12 Magnetism And Matter Notes Chapter 5 Physics   Class 12 Electromagnetic Induction Notes Chapter 6 Physics […]

Notes Class 12 Physics Chapter 15 Communication Systems

Notes For All Chapters Physics Class 12 Topic 1 Communication 1. Communication Communication is the act of transmission and reception of information. 2. Communication System A system comprises of transmitter, communication channel and receiver. A block diagram of a generalised communication system is shown as below: 3. Transmitter It consists of transducer/signal generators, modulators and transmitting antenna. 4. […]

Notes Class 12 Physics Chapter 14 CBSE

Semiconductor Electronic: Material, Devices And Simple Circuits Notes For All Chapters Physics Class 12 1. Metals They possess very low resistivity or high conductivity. ρ ~ 10-2.10-8 Ωm, σ ~102. 108 Sm-1 2. Semiconductors They have resistivity or conductivity intermediate to metals and insulators. ρ ~ 10-5. 106 Ωm, σ ~ 10+5 .10-6 Sm-1 Types of Semiconductors Types of semiconductors are given […]

Notes Class 12 Physics Chapter 13 Nuclei

Notes For All Chapters Physics Class 12 CBSE 1. In every atom, the positive charge and mass are densely concentrated at the centre of the atom forming its nucleus. More than 99.9% mass of the atom is concentrated in the nucleus. 2. Atomic Mass Unit (amu) The unit to express atomic masses is called atomic mass unit. […]

Notes Class 12 Physics Chapter 12 Atoms

Notes For All Chapters Physics Class 12 CBSE 1. All elements consists of very small invisible particles, called atom. Every atom is a sphere of radius of the order of 10-10 m, in which entire mass is uniformly distributed and negative charged electrons revolve around the nucleus. 2. Experimental arrangement for α-scattering experiment and trajectory followed by α […]

Notes Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

Notes For All Chapters Physics Class 12 CBSE 1. Photoelectric Effect The phenomenon of emission of photoelectron from the surface of metal, when a light beam of suitable frequency is incident on it, is called photoelectric effect. The emitted electrons are called photoelectrons and the current so produced is called photoelectric current. Hertz’ Observation The phenomenon of […]

Notes Class 12 Physics Chapter 10 Wave Optics

Notes For All Chapters Physics Class 12 CBSE 1. Wave Optics Describes the connection between waves and rays of light. According to wave theory of light, light is a form of energy which travels through a medium in the form of transverse wave. 2. Wave front The locus of all those particles which are vibrating in the […]

Notes Class 12 Physics Chapter 9 Ray Optics and Optical Instruments

Notes For All Chapters Physics Class 12 CBSE 1. Ray Optics or Geometrical Optics In this optics, the light is considered as a ray which travels in a straight line. It states that for each and every object, there is an image. 2. Reflection Reflection is the phenomenon of changing the path of light without any change […]

Notes Class 12 Physics Chapter 8 Electromagnetic Waves

Notes For All Chapters Physics Class 12 CBSE 1. Displacement Current The current which comes into play m the region in which the electric field and the electric flux is changing with time. It is given by 2. Need for Displacement Current Ampere’s circuital law for conduction current during charging of a capacitor was found inconsistent. Therefore, […]

Notes Class 12 Physics Chapter 7 Alternating Current

Notes For All Chapters Physics Class 12 CBSE 1. Alternating Current (AC) It is the current which varies in both magnitude as well as direction alternatively and periodically. I = I0 sin ωt or I = I0 cosωt where, I0 = peak value or maximum value of AC. 2. Effective Value or rms Value of AC It is defined as […]

Notes Class 12 Physics Chapter 6 Electromagnetic Induction

Notes For All Chapters Physics Class 12 CBSE 1. Magnetic Flux The magnetic flux linked with any surface is equal to total number of magnetic lines of force passing normally through it. It is a scalar quantity. 2. The phenomenon of generation of current or emf by changing the magnetic flux is known as Electromagnetic Induction EMI). […]

Notes Class 12 Physics Chapter 5 Magnetism And Matter

Notes For All Chapters Physics Class 12 CBSE 1. The magnetic dipole moment of a magnetic dipole is given by M = m × 2I where, m is pole strength and 2I is dipole length directed from S to N. The SI unit of magnetic dipole moment is A-m2 or J/T. It is a vector quantity and […]

Notes Class 12 Physics Chapter 4 Moving Charges and Magnetism

Notes For All Chapters Physics Class 12 CBSE 1. The space in the surroundings of a magnet or a current-carrying conductor in which its magnetic influence can be experienced is called magnetic field. Its SI unit is Tesla (T). 2. Oersted experimentally demonstrated that the current-carrying conductor produces magnetic field around it. When key K is closed, […]

Notes Class 12 Physics Chapter 3 Current Electricity

Notes For All Chapters Physics Class 12 CBSE 1. The directed rate of flow of electric charge through any cross-section of a conductor is known as electric current. If ∆Q charge flows in time ∆t, then current at any time t is NOTE: Current is a scalar quantity. I is in the direction of flow of positive […]

Notes Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance

Notes For All Chapters Physics Class 12 CBSE 1. Electrostatic Potential The electrostatic potential at any point in an electric field is equal to the amount of work done per unit positive test charge or in bringing the unit positive test charge from infinite to that point, against the electrostatic force without acceleration. NOTE: Electrostatic potential is […]

Notes Class 12 Physics Chapter 1 Electric Charges and Fields

Notes For All Chapters Physics Class 12 CBSE 1. Electric Charge Charge is the property associated with matter due to which it produces and experiences electric and magnetic effect. 2. Conductors and Insulators Those substances which readily allow the passage of electricity through them are called conductors, e.g. metals, the earth and those substances which offer high […]

Maths Notes Class 7 Ganita Prakash

Notes Chapter 1 – Large Numbers Around Us Notes Chapter 2 – Arithmetic Expressions Notes Chapter 3 – A Peek Beyond the Point Notes Chapter 4 – Expressions using Letter-Numbers Notes Chapter 5 – Parallel and Intersecting Lines Notes Chapter 6 – Number Play Notes Chapter 7 – A Tale of Three Intersecting Lines Notes […]

Notes Visualising Solid Shapes Chapter 13 Maths Class 7

Notes For All Chapters Maths Class 7 The circle, the square, the rectangle, the quadrilateral and the triangle are examples of plane figures. The cube, the cuboid, the sphere, the cylinder, the cone and the pyramid are examples of solid shapes. Plane figures are of two-dimensions (2-D) and the solid shapes are of three dimensions […]

Notes Symmetry Chapter 12 Maths Class 7

Notes For All Chapters Maths Class 7 Lines of Symmetry for Regular Polygons Regular polygons have equal sides and equal angles. They have multiple (i.e., more than one) lines of symmetry. Each regular polygon has as many lines of symmetry as it has sides. Regular Polygon Regular Hexagon Regular Pentagon Square Equilateral Triangle Number of […]

Notes Class 7 Maths Chapter 10 Practical Geometry

Notes For All Chapters Maths Class 7 Construction of Triangles 1. Properties of triangles The exterior angle of a triangle is equal in measure to the sum of interior opposite angles. The total measure of the three angles of a triangle is 180°. Sum of the lengths of any two sides of a triangle is […]

Notes Simple Equations Chapter 4 Maths Class 7

Notes For All Chapters Maths Class 7 An equation is a condition on a variable. A variable is something that can vary. It assumes different numerical values; its value is not fixed. These are usually denoted by letters of the english alphabet, such as x, y, z, l, m, n, p, etc. From variables, we […]