Noun is a word used to indicate a person, thing, place or idea. Learn about proper nouns and common nouns.
A proper noun is used to refer to a specific person, place or object. E.g. John is a very smart boy.
A common noun is used to refer to a class of people, places or objects. E.g. John is a very smart boy.

• An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus.
• The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.
• Each energy level is associated with definite amount of energy.
•  The change in energy takes place when electron jumps from one energy level to another energy level.

Format for Speech Writing - In order to write a perfect speech, we must be well acquainted with the topic and must possess a wide range of vocabulary, a thorough knowledge of the subject, some research, and excellent organizational skills. Here are the ideal format and tips to help you write your perfect speech.
A perfect speech must consist of:-

1. HEADING- The heading should be catchy and in not more than 5-6 words. You can go as creative as you want with this one just make sure you do not devote too much time to it in the exam.
2. OPENING LINE- This includes salutations, introduction, and the topic. Make sure you do not mention your personal details (name, school name, etc.).

Example- Respected Principal, teachers, and my dear friends! Today, I (the name is given in the question) stand before you all to speak on the topic “(given in the question)”.
OR you could start with a quote related to the topic and then go with the salutations and introduction.

1.  BODY- It is the main part of your writing piece.
2. It is always prescribed that you begin with a short introduction on the topic, it’s meant to be precise. 
3. Then you need to explain the current situation, the problems (if any), and whether after any corrective actions, betterment in the situation has been observed or not.
4. It may include advantages/ disadvantages depending upon the topic in question.
5. Now here, it is important you follow a sequence. It is possible that you have too many points or very few points. When you have a lot of varied points, it is better you choose a few best ones and write a line on each. In case you have very few already, explain them in at least two lines each.
6. You have to strictly follow the prescribed word limit in a limited time frame so just do not go on writing and writing.
7. MOST IMPORTANT- Always begin with your strongest point. You can accommodate the weaker ones in between and end with another strong point.
8. Feel free to give your personal opinion in one or two lines.
9. It is very important that you do not deviate from the topic. There are chances you may get ideas linking from one to another that may deviate you from the main point. You have to refrain from doing so.
10. SOLUTION/CONCLUDING PARAGRAPH- Now, it is to be remembered that wherever you elaborate a problem, you always have to mention the steps being taken to improvise the situation and suggest a few solutions as well.

Now, it would be great if you could add a few quotes relating to motivating the people to take action.
Here also, the rule of STRONG-WEAK-STRONG applies.

Vinton G. Cerf is known as the “Father of the Internet". He is the co-designer of the TCP/IP protocols and the architecture of the Internet. The US President, Bill Clinton presented the U.S. National Medal of Technology to Cerf and his colleague, Robert E. Kahn, for founding and developing the wonderful creation of the Internet in December 1997.

The full form of HTTP is the Hypertext Transfer Protocol. HTTP is an application protocol that usually contains a list of guidelines for transferring distributed data file systems and multimedia communication on the World Wide Web ( WWW). It is the basic structure for the World Wide Web, which consists of data communication.

The Central government in India made a law for the Right to work in 200 districts of India is called National Rural Development Guarantee Act 2005 (NREGA, 2005). It is also known as Mahatma Gandhi National Rural Development Guarantee Act 2005 is an Indian labour law and social security measures that guarantees work. People who are able to and are in need of work are guaranteed 100 days of employment in a year by the government under this Act and the government give unemployment allowances to the people, if they fails to provide employment.

Advantages and benefits are same

• Life-line of a nation: No country can progress without the development of entrepreneurship. Every country is trying to promote its trade so that it is able to share the benefits of development. Therefore, entrepreneurship is the yardstick to measure the level of development of a country.
• Provides innovation: Entrepreneurship provides new ideas, imagination and vision to the enterprise. An entrepreneur is an innovator as he tries to find new technology, products and markets. He increases the productivity of various resources. The entrepreneur stands at the centre of the whole process of economic development. He conceives business ideas and puts them into effect, to enhance the process of economic development.
• Change of growth /Inclusive growth: An enterprise operates in a changing environment. The entrepreneur moulds the enterprise in such a changing environment. The latter moulds not only the enterprise, but also alters the environment itself, to ensure the success of the enterprise. In order to meet the challenge of automation and the complexities of advanced technology, there is a need for the development of entrepreneurship.
• Increased profits: Profits can be increased in any enterprise, either by increasing the sales revenue or reducing cost. To increase the sales revenue is beyond the control of an enterprise. Entrepreneurship, by reducing costs, increases its profits and provides opportunities for future growth and development.
• Employment opportunities: Entrepreneurship and its activities provide the maximum employment opportunities. More entrepreneurs provide more opportunities to large numbers of people which benefits growth of country. The growth in these activities bring more and more employment opportunities.
• Social Benefits: Entrepreneurship benefits both business enterprise and to the society at large. It raises the standard of living by providing good quality products and services at the lowest possible cost. It also makes the optimum use of scarce resources and promotes peace and prosperity in the society.

E Sreedharan

E Sreedharan is popularly known as the "Metro Man" for changing the face of public transport in the country with his leadership of building the Konkan Railway and the Delhi Metro.

ANSWER Water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth. It is called the Elixir of life.water is a solvent due to the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge. This helps water dissociate ionic compounds into their positive and negative ions. The positive part of an ionic compound is attracted to the oxygen side of water while the negative portion of the compound is attracted to the hydrogen side of the water.

Commercial unit of energy is kilowatt hour (kWh).
The SI unit of energy is joule.
1 kWh = 3.6x {tex} ${{10}^{6}}$J{/tex}
(ii) Given, P = 2500 W, t = 4 h
E = P/T = 2500/ 1000 x 4 = 10 kwH = 10 units.

Pythagoras triplets are of the form.
2m, m² -1 and m² + 1.

It is given that smallest number is 8.
So, 2m = 8.
m = 4.

Now, second number = m² -1 = 4² - 1 = 15.
and, third number = m² + 1 = 4² + 1 = 17.

Hence, the triplet is 8, 15 and 17.

Verification :-
17² = 8² + 15²
289 = 64 + 225
289 = 289.

Hence, proved.

Q Why dont you make sounds that describe some taste? From your expression and sounds ask your friends to guess you might have eaten.

A n s w e r

We can make following expressions and sounds for different tastes:

River Rafting

• River rafting is another adventure sport. It is a river journey under taken on a raft or boat made of inflatable material. The difficulty of river rafting is from grade I to VI. 

• Life-line of a nation: No country can progress without the development of entrepreneurship. Every country is trying to promote its trade so that it is able to share the benefits of development. Therefore, entrepreneurship is the yardstick to measure the level of development of a country.
• Provides innovation: Entrepreneurship provides new ideas, imagination and vision to the enterprise. An entrepreneur is an innovator as he tries to find new technology, products and markets. He increases the productivity of various resources. The entrepreneur stands at the centre of the whole process of economic development. He conceives business ideas and puts them into effect, to enhance the process of economic development.
• Change of growth /Inclusive growth: An enterprise operates in a changing environment. The entrepreneur moulds the enterprise in such a changing environment. The latter moulds not only the enterprise, but also alters the environment itself, to ensure the success of the enterprise. In order to meet the challenge of automation and the complexities of advanced technology, there is a need for the development of entrepreneurship.
• Increased profits: Profits can be increased in any enterprise, either by increasing the sales revenue or reducing cost. To increase the sales revenue is beyond the control of an enterprise. Entrepreneurship, by reducing costs, increases its profits and provides opportunities for future growth and development.
• Employment opportunities: Entrepreneurship and its activities provide the maximum employment opportunities. More entrepreneurs provide more opportunities to large numbers of people which benefits growth of country. The growth in these activities bring more and more employment opportunities.
• Social Benefits: Entrepreneurship benefits both business enterprise and to the society at large. It raises the standard of living by providing good quality products and services at the lowest possible cost. It also makes the optimum use of scarce resources and promotes peace and prosperity in the society.