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Amorphous solids -...

Amorphous solids -

A

Possess sharp melting points

B

Undergo clean cleavage when cut with knife

C

Do not undergo clean cleavage when cut with knife

D

Possess orderly arrangement over long distances

Text Solution

Verified by Experts

The correct Answer is:
C
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Which is amorphous solid - (A) "Rubber" " " (B) "Plastic" (C) "Glass" " " (D) All

Crystalline solids have a sharp melting point. At a characteristic temperature they melt abruptly and become liquid. On the other hand, amorphous solids soften, melt and start flowing over a range of temperature and can be moulded and blown into various shapes. Amorphous solids have the same structural features as liquids and are conveniently regarded as extremely viscous liquids. They may become crystalline at some temperature. Some glass objects from ancient civilisations are found to become milky in appearance because of some crystallisation. Like liquids, amorphous solids have a tendency to flow, though very slowly. Therefore, sometimes these are called pseudo solids or super cooled liquids. 3. What is the similarity between amorphous solids and liquids ?

Knowledge Check

  • Amorphous solid is :

    A
    Rubber
    B
    Plastic
    C
    Glass
    D
    All

  • Amorphous solid can alos be called ….

    A
    pseudo solids
    B
    true solids
    C
    super cooled liquids
    D
    super cooled solids

  • Amorphous solid can also be called _____

    A
    pseudo solids
    B
    true solids
    C
    super cooled liquids
    D
    super cooled solids

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    Crystalline solids have a sharp melting point. At a characteristic temperature they melt abruptly and become liquid. On the other hand, amorphous solids soften, melt and start flowing over a range of temperature and can be moulded and blown into various shapes. Amorphous solids have the same structural features as liquids and are conveniently regarded as extremely viscous liquids. They may become crystalline at some temperature. Some glass objects from ancient civilisations are found to become milky in appearance because of some crystallisation. Like liquids, amorphous solids have a tendency to flow, though very slowly. Therefore, sometimes these are called pseudo solids or super cooled liquids. 2. What happens when an amorphous solids is heated ?

    Crystalline solids have a sharp melting point. At a characteristic temperature they melt abruptly and become liquid. On the other hand, amorphous solids soften, melt and start flowing over a range of temperature and can be moulded and blown into various shapes. Amorphous solids have the same structural features as liquids and are conveniently regarded as extremely viscous liquids. They may become crystalline at some temperature. Some glass objects from ancient civilisations are found to become milky in appearance because of some crystallisation. Like liquids, amorphous solids have a tendency to flow, though very slowly. Therefore, sometimes these are called pseudo solids or super cooled liquids. 1. Give a characteristic of crystalline solids.

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    Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?

    Select the correct statements. (A) Crystalline solids have long range order. (B) Crystalline solids are isotropic. (C) Amorphous solid are sometimes called pseudo solids. (D) Amorphous solids soften over a range of temperatures. (E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.

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