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7th IMO 2013 – 2014 Answer Keys

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7th IMO 2013 – 2014 Answer Keys

7th IMO 2013 – 2014 Answer Keys are given below.

Answer keys are easy to download – they are in PDF format. If you do not have Adobe Acrobat Reader in your PC to view the answer key.

Click Here for IMO Complete Information

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NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

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NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

National Council of Educational Research and Training (NCERT) Book for Class VI
Subject: Social Studies
Chapter: Chapter 1 – What, Where, How and When?

Class VI NCERT Social Studies Text Book Chapter 1 What, Where, How and When? is given below.

Rasheeda’s question NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

Rasheeda sat reading the newspaper. Suddenly, her eyes fell on a small headline: “One Hundred Years Ago.” How, she wondered, could anyone know what had happened so many years ago?

Finding out what happened

Yesterday: you could listen to the radio, watch television, read a newspaper.

Last year: ask somebody who remembers.
But what about long, long ago? Let us see how it can be done.

What can we know about the past?

There are several things we can find out — what people ate, the kinds of clothes they wore, the houses in which they lived. We can find out about the lives of hunters, herders, farmers, rulers, merchants, priests, crafts persons, artists, musicians, and scientists. We can also find out about the games children played, the stories they heard, the plays they saw, the songs they sang.

Where did people live?

Find the river Narmada on Map 1 (page 2). People have lived along the banks of this river for several hundred thousand years. Some of the earliest people who lived here were skilled gatherers, — that is, people who gathered their food. They knew about the vast wealth of plants in the surrounding forests, and collected roots, fruits and other forest produce for their food. They also hunted animals.

Now find the Sulaiman and Kirthar hills to the northwest. Some of the areas where women and men first began to grow crops such as wheat and barley about 8000 years ago are located here. People also began rearing animals like sheep, goat, and cattle, and lived in villages. Locate the Garo hills to the north-east and the Vindhyas in central India. These were some of the other areas where
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?
agriculture developed. The places where rice was first grown are to the north of the Vindhyas. NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

Trace the river Indus and its tributaries (tributaries are smaller rivers that flow into a larger river). About 4700 years ago, some of the earliest cities flourished on the banks of these rivers. Later, about 2500 years ago, cities developed on the banks of the Ganga and its tributaries, and along the seacoasts.

Locate the Ganga and its tributary called the Son. In ancient times the area along these rivers to the south of the Ganga was known as Magadha. Its rulers were very powerful, and set up a large kingdom. Kingdoms were set up in other parts of the country as well.

Throughout, people travelled from one part of the subcontinent to another. The hills and high mountains including the Himalayas, deserts, rivers and seas made journeys dangerous at times, but never impossible. So, men and women moved in search of livelihood, as also to escape from natural disasters like floods or droughts. Sometimes men marched in armies, conquering others’ lands. Besides, merchants travelled with caravans or ships, carrying valuable goods from place to place. And religious teachers walked from village to village, town to town, stopping to offer instruction and advice on the way. Finally, some people perhaps travelled driven by a spirit of adventure, wanting to discover new and exciting places. All these led to the sharing of ideas between people.

Why do people travel nowadays?

Look at Map 1 once more. Hills, mountains and seas form the natural frontiers of the subcontinent. While it was difficult to cross these frontiers, those who wanted could and did scale the mountains and cross the seas. People from across the frontiers also came into the subcontinent and settled here. These movements of people enriched our cultural traditions. People have shared new ways of carving stone, composing music, and even cooking food over several hundreds of years.

Names of the land

Two of the words we often use for our country are India and Bharat. The word India comes from the Indus, called Sindhu in Sanskrit. Find Iran and Greece in your atlas. The Iranians and the Greeks who came through the northwest about 2500 years ago and were familiar with the Indus, called it the Hindos or the Indos, and the land to the east of the river was called India. The name Bharata was
used for a group of people who lived in the northwest, and who are mentioned in the Rigveda, the earliest composition in Sanskrit (dated to about 3500 years ago). Later it was used for the country.

Finding out about the past

NCERT Class VI Social Studies Chapter 1 What, Where, How and When?There are several ways of finding out about the past. One is to search for and read books that were written long ago. These are called manuscripts, because they were written by hand (this comes from the Latin word ‘manu’, meaning hand). These were usually written on palm leaf, or on the specially prepared bark of a tree known as the birch, which grows in the Himalayas. Over the years, many manuscripts were eaten away by insects, some were destroyed, but many
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

have survived, often preserved in temples and monasteries. These books dealt with all kinds of subjects: religious beliefs and practices, the lives of kings, medicine and science. Besides, there were epics, poems, plays. Many of these were written in Sanskrit, others were in Prakrit (languages used by ordinary people) and Tamil.

We can also study inscriptions. These are writings on relatively hard surfaces such as stone or metal. Sometimes, kings got their orders
inscribed so that people could see, read and obey them. There are other kinds of inscriptions as well, where men and women (including kings and queens) recorded what they did. For example, NCERT Class VI Social Studies Chapter 1 What, Where, How and When? kings often kept records of victories in battle.

Can you think of NCERT Class VI Social Studies Chapter 1 What, Where, How and When? the advantages of writing on a hard
surface? And what could have been the difficulties?

There were many other things that were made and used in
the past. Those who study these objects are called archaeologists.

They study the remains of buildings made of stone and brick, paintings and sculpture. They also explore and excavate (dig under the surface of the earth) to find tools, weapons, pots, pans, ornaments and coins. Some of these objects may be made of stone, others of bone, baked clay or metal. Objects that are made of hard, imperishable substances usually survive for a long time.

 

 

 

 

 

 

 

NCERT Class VI Social Studies Chapter 1 What, Where, How and When?NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

 

 

 

 

 

 

 

 

 

Archaeologists also look for bones — of animals, birds, and fish — to find out what people ate in the past. Plant remains survive far more rarely — if seeds of grain or pieces of wood have been burnt, they survive in a charred form. Do you think cloth is found frequently by archaeologists?

Historians, that is, scholars who study the past, often use the word source to refer to the information found from manuscripts, inscriptions and archaeology. Once sources are found, learning about the past becomes an adventure, as we reconstruct it bit by bit. So historians and archaeologists are like detectives, who use all these sources like clues to find out about our pasts.

One past or many?

Did you notice the title of this book, Our Pasts? We have used the word ‘pasts’ in plural to draw attention to the fact that the past was different for different groups of people. For example, the lives of herders or farmers were different from those of kings and queens, the lives of merchants were different from those of crafts persons, and so on. Also, as is true even today, people followed different practices and customs in different parts of the country. For example, today most people living in the Andaman Islands get their own food by fishing, hunting, and collecting forest produce. By contrast, most people living in cities depend on others for supplies of food. Differences such as these existed in the past as well.

Besides, there is another kind of difference. We know a great deal about kings and the battles they fought because they kept records of their victories. Generally, ordinary people such as hunters, fishing folk, gatherers, farmers or herders did not keep records of what they did. While archaeology helps us to find out about their lives, there is much that remains unknown.

What do dates mean?

If somebody asks you the date, you will probably mention the day, month and year, 2000 and something. These years are counted from the date generally assigned to the birth of Jesus Christ, the founder of Christianity. So, 2000 means 2000 years after the birth of Christ. All dates before the birth of Christ are counted backwards and usually have the letters BC (Before Christ) added on. In this book, we will refer to dates going back from the present, using 2000 as our starting point.
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

 

NCERT Class VI Social Studies Chapter 1 What, Where, How and When?4. Make a list of all the objects that archaeologists may find. Which of these could be made of stone?

5. Why do you think ordinary men and women did not generally keep records of what they did?

6. Describe at least two ways in which you think the lives of kings would have been different from those of farmers.
NCERT Class VI Social Studies Chapter 1 What, Where, How and When?

 

 

7. Find the word crafts persons on page 1. List at least five different crafts that you know about today. Are the crafts persons — (a) men (b) women (c) both men and women?

8. What were the subjects on which books were written in the past? Which of these would you like to read?

Next »

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SCRA 2014 e-Admit Card

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SCRA 2014 e-Admit Card

For Downloading of e-Admit Card for SCRA Examination  2014, please Click Here

PRESS NOTE SPECIAL CLASS RAILWAY APPRENTICES’ EXAMINATION, 2014

The Union Public Service Commission will be conducting the Special Class Railway Apprentices’ Examination, 2014 on 12.01.2014 at various centres all over India as per notification.  E-Admit Cards are available on the Commission’s website http://www.upsc.gov.in.  Candidates are advised to download and check their e-admit cards carefully and bring discrepancy, if any, to the notice of the Commission immediately.  Rejection letters citing the ground(s) for rejection have been issued through e-mails and also put on the Union Public Service Commission’s websitehttp://www.upsc.gov.in.  In case any difficulty is faced by the candidates in downloading e-admit cards, they may contact the UPSC Facilitation Counter on Telephone Nos. 011-23385271, 011-23381125 and 011-23098543 on any working day between 10.00 AM and 5.00 PM.  The candidates can also send Fax message on Fax No. 011-23387310.  No  Admit Card will be sent by post.

In case the photograph is not printed clear on the e-admit cards, candidates are advised to carry three (3) photographs (one identical photograph for each session) along with proof of identity such as Identity Card or Voter Identity Card or Passport or Driving License and printout of e-admit card at the venue of the Examination.

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Rajasthan Board Class 9 Books – Kratika

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Rajasthan Board Class 9 Books – Moments

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Rajasthan Board Class 9 Books – Beehive

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Rajasthan Board Class 9 Books – Shemushi

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Rajasthan Board Class 9 Books – Samkaleen Bharat

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Rajasthan Board Class 9 Books – Bharat Aur Samkaleen Vishva

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Rajasthan Board Class 9 Books – Bharat Aur Samkaleen Vishva

Rajasthan Board Class 9 Books for Bharat Aur Samkaleen Vishva are given below chapter wise.

खंड १ – घटनाएं और प्रक्रियाएँ

खंड २ – जीविका , अर्थव्यवस्था एवं समाज

खंड ३ – रोज़ाना की ज़िन्दगी , संस्कृति और राजनीति

Click Here for All Rajasthan Board Class 9 Books

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Rajasthan Board Class 9 Books – Arth Vyavastha

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Rajasthan Board Class 9 Books – Ek Surakshit Bharat ki Or

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Rajasthan Board Class 9 Books – Ganit

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Rajasthan Board Class 9 Books – Vigayaan

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NTSE 2012: Official Answer key

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The National Council of Educational Research and Training (NCERT) has uploaded the answer key of the National Talent Search Examination (NTSE) 2012 held on 13th May, 2012, on its website www.ncert.nic.in. Feedback on this, emailed at ntse.ncert@yahoo.in, will be accepted up to 15th of July, 2012.   Feedback can also be sent to the following:

Programme Coordinator
National Talent Search Examination
Educational Survey Division
NCERT, Sri Aurobindo Marg,
New Delhi.

NTSE 2012: Official Answer key

NTSE 2012: Official Answer key

Click Here for NTSE Updates, Results, Study Material, Sample Papers and More

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CBSE Class 12 Chemistry Notes: Solid States – Introduction

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Solid:- A solid is defined as the substances which possess rigidity have a definite shape and size.

Example: Book, Sodium, Calsium etc. The main point in which the solid differ from the gases and liquids is that they possess fluidity and solid does not.

CAUSE OF EXISTENCE OF SOME SUBSTANCES AS SOLIDS:-

1. Intermolecular Forces:-

  • These are the forces existing among the constituent particles of substance which keep them close together.

2. Thermal energy:-

  • This is the energy possessed by the constituent particles molecules apart as it tends to make them move fast. As low temperature intermolecular forces are strong and thermal energy is low. Thus the constituent particles only oscillate about their mean position and substance exists as solid.

GENERAL CHATERISTICS OF SOLID STATE:-

Solids possess following properties:-

  1. The constituent particles are very closely packed and the intermolecular distances are very small.
  2. The constituent particles occupy fixed positions and they can only oscillate about their mean positions.
  3. They possess rigidity.
  4. They have high density.
  5. They possess definite shape and volume.
  6. They are incompressible.
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CBSE Class 12 Chemistry Notes: Solid States – Crystalline and Amorpous Solids

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DIFFERENCES BETWEEN CRYSTALLINE AND AMORPHOUS SOLIDS:-

CBSE Class 12 Chemistry Notes: Solid States   Crystalline and Amorpous Solids

Amorphous solids are very useful in everyday life such as:

  1. The glasses [Amorphous] are used in construction house ware, laboratory ware etc.
  2. A large no. of amorphous plastics is being used in forming no. of articles.
  3. Amorphous silica has found to be the best material for converting sunlight into electricity [in photovoltaic cells]
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CBSE Class 12 Chemistry Notes: Solid States – Types of Unit Cell

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Primitive unit cell:-

  • The unit cell in which the constituent particles are present only at the corners are called “simple unit cells” or “primitive unit cells”.

Face centred:-

  • When particles are present not only at the corners, but also at the centre of each face of unit cell, it is called face centred unit cell.

End centred:-

  • When in addition to the particles at the corner, there are also the particles at the centre of any of two opposite faces it is called end centred unit cell.

Body centred:-

  • When in addition to the particles present at the corner one particle is also present at the centre of unit cell it is called body centred unit cell.
    CBSE Class 12 Chemistry Notes: Solid States   Types of Unit Cell

Bravais Lattices:-

  • The fourteen lattices corresponding to seven crystal systems are known as the bravais lattices.
  • We generally represents the unit cells by three dimensional arrangement of spheres.

Coordination Number:-

  • The coordination number of any constituent particle in a given unit cell is the no. of particles touching that particle.

CALCULATION OF NUMBER OF PARTICLES PER UNIT CELL OF A CUBIC CRYSTAL SYSTEM:-

1. Calculation of contribution of atom present at different lattice sites.

  1. An atom at the corner is shared by eight unit cells so its contribution is = 1x(1/8)=1/8
  2. An atom on the face is shared between two unit cells so its contribution is =1x(1/2)=1/2
  3. An atom present at centre of unit cell is not shared by any unit cell so it contribution is = 1
  4. An atom present at the edge is shared by four unit cells so its contribution is =1x(1/4)=1/4

2. Calculation of number of atoms per unit cell:-

  1. Simple [primitive] unit cell:- It has only Eight atom present at corner each have contribution 1/8 so 8 x 1/8 = 1 atom.
  2. In body centred unit cell (BCC):- 1. 8 atom on corner = 1/8 x 8 = 1 atom
    1 atom at the centre = 1 x 1 = 1
    So total no. of atoms = 1 + 1 = 2 atoms.

3. In face centred unit cell [FCC]:-

  1. Contribution by atoms at corner = 1/8 x 8 = 1
    Contribution by atoms at faces = 1/3 x 6 = 3
    So total atoms = 3 + 1 = 4 atoms.
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16th NSO 2013 – 2014 Result

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16th NSO 2013 – 2014 2nd Level Result

NSO 2014 First Level Result

Results of 1st level National Science Olympiad (NSO) 2014  are declared.

16th NSO Result

You can check your result by entering your Roll Number HERE

Please enter the Roll No. in this format – YourSchoolCode-ClassNumber-RollNo. e.g. AN0001-04-001

16th NSO Resources

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CBSE Class 12 Chemistry Notes: Solid States – Crystal Lattice

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Crystal lattice:-

  • a. Such a regular arrangement of the constituent particles [atoms, ions or molecules] of a lattice.
  • b. The constituent particles of crystalline solids are arranged in definite fashion in three dimensional space.

Characteristic of crystal lattice:-

  • a. Each point in the crystal lattice represents a constituent particle which may be atom, molecule, ion.
  • b. Each points in the lattice is called lattice point or lattice site.
  • c. The points are joined by lines just to represent the geometry of the lattice.

Unit cell:-

  • The smallest three dimensional portion of a complete space lattice which when repeated over and over again in different directions produce the complete space lattice is called the unit cell.

Parameters of a unit cell:-

  • a. Its dimensions (length) along the three edges may or may not be perpendicular
  • b. Angles between the edges, angle alpha(a) between b and c, β between a and c, γ between a and b. Thus a unit cell is chaterised six parameters.
    CBSE Class 12 Chemistry Notes: Solid States   Crystal Lattice
    Based upon difference in the parameters there are basically seven types of unit cell are:-

    CBSE Class 12 Chemistry Notes: Solid States   Crystal Lattice

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CBSE Class 11 Maths Notes: Binomial Theorem – Middle Term

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