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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ८

Why wires cannot be drawn from materials such as stone or wood?

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प्रश्न

Why wires cannot be drawn from materials such as stone or wood?

एका वाक्यात उत्तर
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उत्तर

Wires cannot be drawn from materials such as stone or wood, is because these materials are non – conductors of electricity.

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पाठ 9: Matter around us - Exercises [पृष्ठ १०३]

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सामाचीर कलवी Science [English] Class 8 TN Board
पाठ 9 Matter around us
Exercises | Q VI. 2. | पृष्ठ १०३

संबंधित प्रश्‍न

The molecules can move freely anywhere in


When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

  1. What could particles X be ?
  2. What do you think liquid Y is ?
  3. What is the zig-zag movement of X known as ?
  4. What is causing the zig-zag movement of particles X ?
  5. Name the scientist who discovered this phenomenon.
  6. What does this experiment tell us about the nature of liquid Y?

Give reason why copper metal is used for making electric wires.


Name a metal which has a low melting point.


How will you test whether a given solution is a colloidal solution ?


Explain what happens when a beam of light is passed through a colloidal solution.


Define Sol and give one example.


When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.

(a) What type of change occurs when solid A is dissolved in water ? Why ?

(b) What type of change occurs when solid D is dissolved in water ? Why ?

(c) Name a metal which you think could behave like solid A. Also name the products B and C.

(d) Name the solid D if it is the one which is used in making ordinary dry cells.

(e) Name the process by which D can be recovered from E.


You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?


Which of the following statements are true for pure substances?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be compounds or mixtures

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all elements other than nickel


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