Environment and its importance Our surrounding that includes living and non-living things is our environment. Living things are called biotic components and non-living things are called abiotic components of our environment. Both biotic and abiotic components have effect on our lives. Even a small change in any component may have significant effect on our […]
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What is Telecommunication Tele means far or distant and communication means exchange of information, message, text etc. Thus telecommunication means to send or receive information at a place that is far away from us. In the past information at distant place was sent by physically going at that place. It was a time consuming process.
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Earth and its importance Earth is a beautiful planet in our solar system. It is only known planet in the universe that supports life. Humans, all other animals and plants evolve on the earth over the time by using resources and nourishment provided by the earth. We are in the universe because there is
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Science and its Importance The word science means ‘to know’. Science is the systematic study of nature, natural things and natural laws. Science: Answers the mysteries of the universe. Gives us the simplified solutions for our day to day problems. Increases the quality of our lives Sir C V Raman and ‘Raman Effect’ Scientists
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What is Braille? Human and animals have eyes with which they can see things, humans also use their eye sight to read and communicate with others. Some people do not have normal eye sight, they are called visually impaired people. Braille is a system that visually impaired people can use to read by touching
Venn Diagrams Venn Diagrams:- Earlier we have discussed twomethods to represent a set (i) Roster form and (ii) Set Builder form. The third method to represent a set is by diagrams or pictures called Venn-diagram (also called Venn-Euler diagrams) In this method universal set is represented by a rectangle and other sets are represented bycircles
Subsets:- Consider a set ‘A’ of all the boys in classeleventh and set ‘B’ of all the students ( Boys + Girls) in class eleventh. Itis clear that all the members of set ‘A’ are also members of set ‘B’ then wecan say that set ‘A’ is subset of set ‘B’ or set ‘A’ is
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1. Empty set :- A set having no element is called empty set . It is denoted by φ(Phi) or { } e.g. A set of all students of eleventh class in a high school is an empty set because no student of a high school is in class eleventh we can write it as
Set:- A set is a well defined collection of distnict objects. Here it is important to understand the meaning of term ‘well defined’. Let us take an example to understand it . Suppose there are 30 students in class eleventh, I asks you to make list boys then you can easily do it, if same task is