Tamilnadu 6th to 10th science book pdf


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6th science book term 1 english medium pdf
sheik mohamedTue, 22 Feb, 21:57 (3 days ago)
to me

We have already heard about the words like weight , kilogram , litres , millilitres , kilometre , length , distance etc. In this chapter let’s have a deeper look at length , weight , volume and time and the necessity to measure them . To do the tasks given above we need to know about measurement . The comparison of unknown quantities with some known quantities is known as measurement . Measurement of a quantity has two parts : a number and its unit¬†.

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We all know that the sun gives us light . Does it give us heat ? After standing under the sun light for some time , touch your head . Does it feel hot ? Yes , it feels hot because the sun gives out heat besides light . Now , You can understand why it is difficult to walk bare – footed on sunny days in the afternoon .

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‘ Magnetite ‘ after the name of the boy Magnus . The name is also supposed to come after the name of the place ( Magnesia ) in which it was found . Magnetite was the ore with attracting property found in that region . Magnetites are natural magnets . They are called magnetic stones . Natural magnets do not have a definite shape . Since , they are used for finding direction , they are also called ‘ leading stones ‘ or ‘ lode stones ‘.

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In our daily life , we encounter many irregularly shaped figures like leaves , maps , stickers of stars or flowers , peacock feather etc. The area of such irregularly shaped figures cannot be calculated using any formula . How can we find the area of these irregularly shaped objects ? We can find the area of these figures with the help of a graph sheet . The following activity shows how to find the area of irregularly shaped plane figures . The graphical method explained above can be used to find the area of regularly shaped figures also . In the case of square and rectangle , this method gives the area accurately .

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The temperature of the object is well approximated with the kinetic energy of the substances . The high temperature means that the molecules within the object are moving at a faster rate . But the question arises , how to measure it ? Molecules in any substance are very small to analyze and calculate its movement ( Kinetic energy ) in order to measure its temperature . You must use an indirect method to measure the kinetic energy of the molecules of a substance . We studied that solids expands when heat is supplied to it . Like solid substances , liquids are also affected by heat . To know this let us do the activity 1 . In a thermometer , when liquid gets heat , it expands and when it is cooled down , it contracts . It is used to measure temperature . Like solid and liquid objects , the effect of heat is also observed on gaseous objects .

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Natural Sources of light Sources which emit light naturally are known as natural sources of light . The Sun is the primary and the major source of natural light . Stars also produce light , in the same way as the Sun do . However , as they are much farther away than the Sun , the light from them are too weak . The moon provides light , particularly in the night . Some living organisms have the ability to produce light named by bioluminescence . It is the effect of certain chemical reactions occurring in the organism . Fireflies , jellyfish , glow worm , certain deep sea plants and some microorganisms can emit light naturally .

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Physics is the study of nature and natural phenomena . Physics is considered as the base of all science subjects . It is based on experimental observations . The principles and observations allow us to develop a deeper understanding of nature . Scientific theories are valid , only if they are confirmed through various experiments . Theories in physics use many physical quantities that have to be measured . Measurement is the base of all scientific studies and experimentations . It plays a vital role in our daily life . It is the process of finding an unknown physical quantity by using a standard quantity . In this lesson , we will study about measurement in detail . We will also study about accuracy and precision , approximation and rounding off .

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Measurement is the basis of all important scientific study . It plays an important role in our daily life also . While finding your height , buying milk for your family , timing the race completed by your friend and so on , you need to make measurements . Measurement answers questions like , how long , how heavy and how fast ? Measurement is about assigning a number to a characteristic of an object or event which can be compared with other objects or events . It is defined as the determination of the size or magnitude of a quantity . In this lesson you will learn about units of measurements and the characteristics of measuring instruments .

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According to Aristotle a Greek Philosopher and Scientist , the natural state of earthly bodies is ‘ rest . He stated that a moving body naturally comes to rest without any external influence of the force . Such motions are termed as ‘ natural motion ‘ ( Force independent ) . He also proposed that a force ( a push or a pull ) is needed to make the bodies to move from their natural state ( rest ) and behave contrary to their own natural state called as ‘ violent motion ‘ ( Force dependent ) . Further , he said , when two different mass bodies are dropped from a height , the heavier body falls faster than the lighter one .

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6th science book term 1 tamil medium pdf
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9th science book tamil mediumDOWNLOAD
10th science book tamil medium pdf
10th science book tamil mediumDOWNLOAD
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