• By noor arora
• 23 Oct 2022

What is Combustion? Combustion is a chemical process in which a substance reacts with oxygen and generates heat in the process. Combustible substances are those substances that undergo combustion. It means that these substances give off heat and sometimes light (as a

• By noor arora
• 23 Oct 2022

Introduction → There are two types of resources:(i) Inexhaustible Natural Resources (Renewable sources of energy)(ii) Exhaustible Natural Resources (Non-renewable sources of energy) Inexhaustible Natural Resources → They are renewable sources of energy that are replenished at a rate faster than that at

• By noor arora
• 23 Oct 2022

Introduction → Materials are classified in two types i.e. metals and non-metals. → Metals can be distinguished from non-metals on the basis of their physical and chemical properties. Metals Physical properties of metals → They have shining surface in their

• By noor arora
• 23 Oct 2022

Fabrics are made by weaving fibres (or threads) obtained from natural or artificial sources. They can be of two types: What are Synthetic Fibres? What is a synthetic fibre made up of? A synthetic fibre, as well as plastic, is made up

• By noor arora
• 23 Oct 2022

What are Microbes?Microbes or microorganisms are tiny organisms which are so small that we cannot see them with an unaided eye. Some microorganisms can be seen with the help of a magnifying glass (such as fungus that grows on bread)

• By noor arora
• 23 Oct 2022

Introduction → Human requires food for their survival as the energy obtained from the food is used for the various metabolic activities as Respiration, Excretion etc. We get our food from plants by Agricultural practices and animals too by the

• By noor arora
• 23 Oct 2022

Numbers in General Form The general form of a number is obtained by adding the product of the digits with there place values. 1. The General Form of a Two Digit Number ab = a × 10 + b =

• By noor arora
• 23 Oct 2022

Graph The graphs are the visual representation of the data collected in numerical form so that it could be easily understood. Graphs are generally used for comparisons between two or more data. Types of Graph 1. Bar Graph A bar

• By noor arora
• 23 Oct 2022

Factors of Natural Numbers Factors are the pair of natural numbers which give the resultant number. Example 24 = 12 × 2 = 6 × 4 = 8 × 3 = 2 × 2 × 2 × 3 = 24

• By noor arora
• 23 Oct 2022

Introduction to Direct and Inverse Proportions There are so many situations in our life where we see some direct or indirect relationship between two things. Like If the number of things purchased is increasing then the amount to pay will also