Class 8 Chemical Effects Of Electric Current Notes Chemical Effects of Electric Current:- The passage of an electric current through a conducting solution causes the chemical reaction. The resulting effects are called chemical effects of current. Electroplating is an example of a chemical effect of current. Electrolyte:- Conducting liquids are called electrolytes. A chemical reaction […]
Class 8 Sound Notes Sound:- Sound is a form of energy which produces a sensation of hearing in our ears. Vibration:- A kind of rapid to and fro motion of an object is called vibration. Sound is produced by vibrating objects. This motion is also known as Oscillatory motion. Voice Box :- Upper end of […]
Class 8 Reaching the Age of Adolescence Notes Adolescence :- The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence. Adolescence begins around the age of 11 and lasts upto 18 or 19 years of age. Since this period covers the ‘teens’ (13 to18 or 19 years of age), […]
Class 8 Force And Pressure Notes Force :– A push or pull on an object is called force. S.I Unit = Newton Effects of Force :- Change in state of motion :- Change in the speed of an object. Change in its direction of motion. Change in shape and size of an object :- We […]
Reproduction In Animals Notes Reproduction :- Reproduction is the ability of the living organism to produce young ones of their own kind. Modes of Reproduction :- Asexual Reproduction Sexual Reproduction Sexual Reproduction :- The type of reproduction in which male and female Parents involved to give rise to an offspring is called sexual reproduction. Male […]
Conservation of Plants and Animals Notes Deforestation:- Deforestation is the process of clearing of forests and using the land for industrial, agricultural and other purposes. Causes of deforestation :- Procuring lands for cultivation. Building houses and factories. Making furniture or using wood as fuel. Rapid urban development. Natural causes such as Forest fires, Droughts, Acid […]
Force and Pressure Notes Force :- A push or pull upon an object ; it results from its interaction with another object . { The S.I. unit of Force is Newton } Effect of force :- Change in the state of motion Change in size/shape of an object Change in direction of an object Some […]
Friction Notes Friction:- It is a type of force that opposes the relative motion between two surfaces of objects in contact. The force of friction always acts in a direction opposite to that of the applied force. Friction is a force that comes into play when two surfaces come in contact with each other. Causes […]
Combustion and Flame Notes Combustion:- A chemical process in which a substance reacts with oxygen to give off heat is called combustion. Sometimes, light is also given off during combustion, either as a flame or as a glow. Ignition Temperature:- The lowest temperature at which a substance catches fire is called its ignition temperature. Inflammable […]
Materials : Metals and Non-metals Notes Physical properties of metals:- They are solid in state except mercury (liquid). They are malleable i.e., they can be beaten into thin sheet. Gold and silver are most malleable metals. They are ductile i.e., they can be drawn into thin wire. Gold is the most ductile metal. They are […]