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Short Definition of Mathematics

Notation: Writing a number in figures is called notation. Numeration: Writing a number in words is called numeration. Numeral: A group of digits, denoting a number is called a numeral. i.e., 4628, 76590, 803742 etc.are numerals . Factor: A number, which divides the divident completely leaving no remainder, is known as the number 's Factor of the number. Multiple: A dividend into which a factor can divide is called the Multiple of that number.               30÷5=6 Here,30 is a multiple of 6. Even Numbers: All multiples of 2 are called even numbers.  Odd Numbers: Numbers which are not multiples of 2 are called odd numbers. Prime Numbers: Each of the numbers which have exactly two factors, namely 1 and itself, is called a prime number. Example: The numbers 2,3,5,7,11,13.........,etc. are prime numbers. Composite Numbers: Numbers having more than two factors are known as composite numbers. Example: The numbers 4,6,8,9,10,12,14.........., etc. are composite numbers. Twin Primes: Two c
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Revision notes class 9th S.st (Geography) Ch:3 Drainage

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                  Drainage                   Chapter 3 ✳️Introduction ๐Ÿ’ขThe area drained by a single river system is called a drainage basin. ๐Ÿ’ขA closer observation on a map will indicate that any elevated area, such as a mountain or an upland, separates two drainage basins. Such as upland is known as a water divide.                   Water Divide ✳️Drainage Systems In India ๐Ÿ’ขThe drainage systems of India are mainly controlled by the broad relief features of the subcontinent. ✴️The Indian rivers are divided into two major groups: ✳️: The Himalayan rivers  ✳️:The Peninsular rivers ๐Ÿ’ขThe two major physiographic regions of India, the Himalayan and the Peninsular rivers are different from each other in many ways. ๐Ÿ’ขMost of the Himalayan rivers are perennial. ๐Ÿ’ขThe two major Himalayan rivers, the Indus and the Brahmaputra originate from the north of the mountain ranges. They have cut through the mountains making gorges.                     A Gorge ๐Ÿ’ขThe Peninsular r
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Revision notes class 9th S.st (Economics) Ch:2

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                  Chapter: 2           People as Resource ๐Ÿ”…Population of a nation can be its asset rather than liability. ๐Ÿ”…Population becomes human capital when there is investment made in the form of education, training and medical care. ๐Ÿ”…'People as resource' is a way of referring to a country's working people in terms of their existing productive skills and abilities. ๐Ÿ”…When existing human resource is developed by becoming educated and healthy it turns into human capital. ๐Ÿ”…Human capital is superior to other resources like land and physical capital, as it uses these capitals and adds value to them. ๐Ÿ”…Investment in human capital (through education, training, medical care) can give high returns in the future. Country like Japan have invested a lot in human resources. They do not have  rich natural resource, but still they are called developed nations. ๐Ÿ”…Human beings perform many activities which can be grouped into economic and non -economic. ๐Ÿ”† Economic Activities by Me
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Revision notes class 9th S.st (Economics)Ch:1

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The Story Of Village Palampur                   Chapter :1 ๐Ÿ”† Introduction ๐Ÿ”…Palampur is a hypothetical village which is well -connected with neighbouring villages and towns. ๐Ÿ”…Raiganj a big village, is 3 kilometres from Palampur. ๐Ÿ”…The village is well connected by the road and most of the houses are electrified. ๐Ÿ”…This village has about 450 families belonging to several different castes. The 80 upper caste families on the majority of land in the village. ๐Ÿ”…The SCs (Dalits) comprise one third of the population and live in one corner of the village and in much smaller houses some of which are of mud and straw.           Scene of a village ๐Ÿ”…It has two primary schools and one High school. ๐Ÿ”…There is a primary health centre run by the government and one private dispensary where the sick are treated. ๐Ÿ”…farming is the man production activity in the village Palampur. Most of the people are dependent on farming for their livelihood. Non -farming activities such as diary, small -sc
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Revision notes class 9th S.st (Geography) Ch:2

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    Physical features of India                   Chapter: 2 ๐Ÿ”† Introduction   ๐Ÿ”…India has all major physical features of the earth , i.e. mountains , plains , deserts , plateaus and Islands. ๐Ÿ”…In India the soil colour varies from place to place as it is formed from different types of rocks. ๐Ÿ”…India is a large land mass formed during different geological periods. ๐Ÿ”…India's relief features are outcome of other processes like weathering , erosion and deposition. ๐Ÿ”…India has varied physical features whose formation can be explained on the basis of the 'Theory of Plate Tectonics'. ๐Ÿ”…According to the theory of Plate Tectonics the 7 major and minor plates that form the earth's crust keep moving , causing stress and thus leading to folding , faulting and volcanic activity. ๐Ÿ”…Plates can have convergent ,divergent and transform boundaries. ๐Ÿ”…India's Peninsular part is made from one of the oldest landmass of the world's 'Gondwana land'. It was a single
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Revision notes class 9th S.ST (Geography)ch:1

        India size and location                   Chapter:1 ๐Ÿ”…India is an ancient civilization but now it is a developing nation .It has shown remarkable progress in various fields. ๐Ÿ”… Location   ๐Ÿ”…India lies entirely in the Northern hemisphere. ๐Ÿ”…India's mainland extends between 8 degree 4'N and 37 degree 8'N latitudes ,and 68 degree 7'E and 97 degree 25'E longitudes. ๐Ÿ”…The Tropic of Cancer (23 degree 30'N)divides India into two almost equal parts. ๐Ÿ”…The island groups of Lakshadweep and Andaman and Nicobar are also part of India. ๐Ÿ”… Size ๐Ÿ”…Covering an area of 3.28 million square kilometres, India's total area is 2.4 % of the total geographical area of the world. ๐Ÿ”…India is the world's seventh largest country with a land boundary of about 15,200 km ,with total length of the coastline being 7,516.6 km. ๐Ÿ”…India's East -West extent appears to be smaller than the north-south extent. ๐Ÿ”…India latitudinal and longitudinal extent is about 30 degrees. ๐Ÿ”…India
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เคธเคฎाเคจ्เคฏ เคœ्เคžाเคจ

                เคญाเคฐเคค เคฎें เคช्เคฐเคฅเคฎ 1) เคญाเคฐเคคीเคฏ เค—เคตเคฐ्เคจเคฐ เคœเคจเคฐเคฒ? เค‰เคค्เคคเคฐ) .เคธी เคฐाเคœเค—ोเคชाเคฒाเคšाเคฐी (เคœूเคจ 1948 เคธे 25 เคœเคจเคตเคฐी 1950) 2) เคฐाเคท्เคŸ्เคฐเคชเคคि? เค‰เคค्เคคเคฐ )เคกॉ .เคฐाเคœेंเคฆ्เคฐ เคช्เคฐเคธाเคฆ 3) เค‰เคชเคฐाเคท्เคŸ्เคฐเคชเคคि? เค‰เคค्เคคเคฐ)เคกॉ .เคเคธ เคฐाเคงाเค•ृเคท्เคฃเคจ 4) เคฎुเคธ्เคฒिเคฎ เคฐाเคท्เคŸ्เคฐเคชเคคि? เค‰เคค्เคคเคฐ )เคกॉ .เคœाเค•िเคฐ เคนुเคธैเคจ ( 1967 เคธे 1969 เคคเค•) 5) เคฒोเค•เคธเคญा เค…เคง्เคฏเค•्เคท ? เค‰เคค्เคคเคฐ) เคœी.เคตी. เคฎाเคตเคฒंเค•เคฐ ( 1952 เคธे 1956 เคคเค•) 6) เคช्เคฐเคงाเคจเคฎंเคค्เคฐी ,เคตिเคฆेเคถเคฎंเคค्เคฐी ? เค‰เคค्เคคเคฐ ) เคœเคตाเคนเคฐเคฒाเคฒ เคจेเคนเคฐू  7) เค‰เคช เคช्เคฐเคงाเคจเคฎंเคค्เคฐी? เค‰เคค्เคคเคฐ )เคธเคฐเคฆाเคฐ เคตเคฒ्เคฒเคญเคญाเคˆ เคชเคŸेเคฒ     8) เคตिเคงि ( เค•ाเคจूเคจ )เคฎंเคค्เคฐी ? เค‰เคค्เคคเคฐ )เคกॉ .เคฌी .เค†เคฐ . เค…ंเคฌेเคกเค•เคฐ 9) เคถिเค•्เคทा เคฎंเคค्เคฐी ?  เค‰เคค्เคคเคฐ) เค…เคฌुเคฒ เค•เคฒाเคฎ เค†เคœाเคฆ                 10) เคฐเค•्เคทा เคฎंเคค्เคฐी ? เค‰เคค्เคคเคฐ )เคธเคฐเคฆाเคฐ เคฌเคฒเคฆेเคต เคธिंเคน     11) เคตिเคค्เคค เคฎंเคค्เคฐी ? เค‰เคค्เคคเคฐ) เค†เคฐ .เค•े . เคธเคจ्เคฎुเค–  เคถेเคŸ्เคŸी 12) เคธंเคšाเคฐ เคฎंเคค्เคฐी  ? เค‰เคค्เคคเคฐ )เคฐเคซी เค…เคนเคฎเคฆ เค•िเคฆเคตเคˆ  13) เคฐेเคฒเคตे เค”เคฐ เคชเคฐिเคตเคนเคจ เคฎंเคค्เคฐी ? เค‰เคค्เคคเคฐ )เคœॉเคจ เคฎเคฅाเคˆ  14) เคฎुเค–्เคฏ เคจ्เคฏाเคฏเคงीเคถ ? เค‰เคค्เคคเคฐ เคนเคฐिเคฒाเคฒ เคœे .เค•ाเคจिเคฏा (1950-1951) 15) เคญाเคฐเคค เค•े เคช्เคฐเคฅเคฎ เค†เคˆ.เคธी .เคเคธ. เค…เคงिเค•ाเคฐी ? เค‰เคค्เคคเคฐ )เคธเคค्เคฏेंเคฆ्เคฐ เคจाเคฅ เคŸैเค—ोเคฐ            
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