778 - 88

= 690

First five odd natural number : 1 , 3, 5, 7, 9

Hence the mean of first five odd natural numbers is 5.

Q u e s t i o n :
Write equations for the following statements.
(a) Twice a number decreased by 8 gives 10.
A n s  w e r
2 x - 8 = 10

Pericardium

The heart is enclosed by a sac-like covering called as pericardium. It has 2 layers. The outer layer is more fibrous and is called as a parietal layer. 
The inner layer is smooth and is called as a visceral layer. Pericardium protects the heart from mechanical injury and helps in the movement of the heart walls.

A n s w e r 
The main function of the transport system is to allow for the move nutrients, oxygen, carbon dioxide, hormones, antibodies, urea and heat within the blood plasma throughout the body.

Infectious disease is caused by certain microorganisms called pathogens and leads to infections. These can be spread from one person to another hence are also called communicable disease. For example cholera, malaria, chickenpox.

Communicable Disease

Infectious disease is caused by certain microorganisms called pathogens and leads to infections. These can be spread from one person to another hence are also called communicable disease. For example cholera, malaria, chickenpox.

 formula in Excel may contain any or all of the following.

1. Cell References: They are the addresses of the cells containing values to be used in calculations such as A₁ (Single cell) or A₁ : B2 (Range of cells).
2. Operators: They specify the type of operation you want to perform such as +, – or *.
3. Constants: They are the numbers or text values that can be entered directly in a formula such as 12 or “Joseph”.

 formula in Excel may contain any or all of the following.

1. Cell References: They are the addresses of the cells containing values to be used in calculations such as A₁ (Single cell) or A₁ : B2 (Range of cells).
2. Operators: They specify the type of operation you want to perform such as +, – or *.
3. Constants: They are the numbers or text values that can be entered directly in a formula such as 12 or “Joseph”.

Functions are predefined formulas that can be applied directly to perform calculations in Excel.

Clicking the arrow next to the AutoSum option lists some of the commonly used functions (Fig. 2.22). These include Average, Count Numbers, Max and Min functions.

Advantages :
1) we can get information on any subject
2) Search engines are powerful 
3) Ability to do research from your home versus research libraries. 
4) Information at various levels of study. Everything from scholarly articles to ones directed at children. 
5) Message boards where people can discuss ideas on any topic. Ability to get wide range of opinions. People can find others that have a similar interest in whatever they are interested in. 
6) The internet provides the ability of emails. Free mail service to anyone in the country. 
7) Platform for products like SKYPE, which allow for holding a video conference with anyone in the world who also has access. 
8) Friendships and love connections have been made over the internet by people involved in love/passion over similar interests. 
9) Things such as Yahoo Answers and other sites where kids can have readily available help for homework. 
10) News, of all kinds is available almost instantaneously. Commentary, on that news, from every conceivable viewpoint is also available. 

Disadvantages :
1) There is a lot of wrong information on the internet. Anyone can post anything, and much of it is garbage. 
2) There are predators that hang out on the internet waiting to get unsuspecting people in dangerous situations. 
3) Some people are getting addicted to the internet and thus causing problems with their interactions of friends and loved ones. 
4) Pornography that can get in the hands of young children too easily. 
5) Easy to waste a lot of time on the internet. You can start surfing, and then realize far more time has passed than you realized. Internet and television together of added to the more sedentary lifestyles of people which further exacerbates the obesity problem. 
6) Internet has a lot of "cheater" sites. People can buy essays and pass them off as their own far more easily than they used to be able to do. 
7) There are a lot of unscrupulous businesses that have sprung up on the internet to take advantage of people. 
8) Hackers can create viruses that can get into your personal computer and ruin valuable data. 
9) Hackers can use the internet for identity theft. 
10) It can be quite depressing to be on the internet and realize just how uneducated so many people have become in today's society.

A n s w e r
I C T skills are about understanding and applying a range of computer programmes, software and other applications. These include: word processing, spreadsheets, databases, power points and search engines.

Examination Hall

__________ city

28 February 2020

Dear Anu

How are you? I am fine and wish the same for you. Your brother told me that you only study these days and don't play. I admit that your exams are approaching but this doesn't mean that you will not play at all. Do you know that if you stay static at one place and don't budge from your place, it will adversely affect your health. No play will also lead to obesity. Haven't you heard the proverb- 'All work and no play makes Jack a dull boy.'

I hope you understand the benefits of playing and will work on it.

In wait of your answer.

Pay my regards to uncle and aunt.

Your true friend

Shruti

पहली कठपुतली की बात दूसरी कठपुतलियों को क्यों अच्छी लगी ?

Answer:

पहली कठपुतली की बात दूसरी कठपुतलियों को अच्छी लगी क्योंकि पहली कठपुतली स्वतंत्र होने की बात कर रही थी और दूसरी कठपुतलियाँ भी बंधन से मुक्त होकर आज़ाद होना चाहती थीं।

1540 multiply by 4/100 = 1540 × 4/100 = (154 ×4)/10 = 616/10 = 61.6

    Films are often the representation of reality.They have gained popularity not only because they serve as a source of entertainment,but also play a crucial role in bringing a change in the society, by spreading awareness about different issues that are a matter of social concern.With the evolution of films, people's dependance on them have increased,because they are entertaining as well as educative.Films have an impact on people's way of living,opinions and behavioural patterns.

Part I

The story has half a dozen characters in it. Three of them are children – the narrator, his younger brother Nishad (Seven) and sister Maya. They become expert detectives. Their mother is a doctor with her clinic. Mr. Nath, the principal character and who lives in Shankar’s house alone, is under her treatment. Ramesh takes tea and meals from the restaurant to Nath’s room. Nath pays cash and also tips to the bearer well.

The children go ahead to collect information about Nath. They think Mr Nath is a mysterious person. He has no friend there. Nishad has a bit of sympathy for Nath. His approach in this case is sensible.

The narrator is sure that Mr. Nath is an escaped crook or criminal. Nishad is doubtful. He wants to discover the truth. And he collects a lot of information in the case. The narrator has got a ready answer to all Nishad’s doubts. He thinks that Nath is a rich man. He has perhaps got millions of rupees locked in some trunks in his room. He notes dark scars also on Nath’s face. Nath might have got them during a shot out with the police. But Nishad contradicts him. Mummy had told him that they were bum scars.

One day Seven goes alone to his Mamma’s clinic at Girgaum. He gets upset to see Mr. Nath who looks so thin, poor and starving. He goes to Nath’s room and puts a bar of chocolate in the man’s hand. He collects one more clue about Mr. Nath’s routine. Ramesh told him that on every Sunday he carries two lunches to Mr Nath’s room and the same visitor is with him each time.

The tall, fair and stout visitor talks a lot whereas Mr. Nath simply listens. But he cannot imagine that Nath is a crook.

Part II

The narrator makes a long list of all the information they have collected about their target. He reads it out to Nishad.

They don’t know what Mr. Nath’s first name is, they must discover it.

The other tenants at Shankar house say that Nath is mad, strange and unfriendly.

He doesn’t talk to anyone.

He is under Mamma’s medical treatment so he has to be polite to the children.

He receives no letters.

He has been living in Room 10 for more than a year. He doesn’t work to earn his livelihood.

He has no visitors Only on Sunday a fair, white man comes to him for lunch.

Food and tea are taken to his room by Ramesh from the restaurant distributors.

Nishad doesn’t pay much attention to the narrator’s list of facts. He only pities that the poor man is without any friend. The narrator argues that the Sunday visitor must be Nath’s partner in crime, and comes on Sunday to give a part of ill-gotten money to Mr. Nath. As for Ramesh, Mr. Nath bribes him to keep quiet about his criminal activities.

Nishad doesn’t quite agree with the narrator. He says he will not cooperate in their investigation if they did not stop calling Mr. Nath an escaped criminal. In his opinion, the purpose of their enquiry is to find out why Mr. Nath is so thin and lonely. He declares that he likes Mr. Nath and he will try to befriend him.

Maya is the narrator in the lesson ‘Expert Detectives.’

Does Nishad agree with Maya about Mr Nath? How does he feel about him?

Solution:

No, Nishad doesn’t agree with Maya about Mr Nath. He feels bad for Mr Nath because he thinks that he is a poor and lonely man.

He also feels that he is a generous man because he gives tips to Ramesh regularly. He is determined to find why he is so thin and lonely.

Solution:

Maya thinks that Mr Nath is a crook because he doesn’t talk to anyone and has no friends. She believes that his scars are result of shoot-out with police.

He doesn’t work anywhere and sits at home all the day and there are no visitors at his place except the Sunday morning guest.

He is not bothered about his meals and pays the money in cash. She thinks that the Sunday visitor is his partner in the crime. He keeps the money from the loot and comes to give Mr Nath his share

1. What trees does Mr Wonka mention? Which tree does he say lives the longest?
2. How long does this tree live? Where can you find it?

Solution:

1. Mr Wonka mentions fir, oak, cedar and Bristlecone pine trees lives the longest.
2. Bristlecone pine lives for over 4000 years and one can find them upon the slopes of Wheeler Peak in Nevada, USA.