Advertisements
Advertisements
प्रश्न
Which of the following statement is not true about amorphous solids?
विकल्प
On heating they may become crystalline at certain temperature.
They may become crystalline on keeping for long time.
Amorphous solids can be moulded by heating.
They are anisotropic in nature.
Advertisements
उत्तर
They are anisotropic in nature.
Explanation:
Amorphous solids are isotropic because they show thermal and optical properties, same in all directions.
APPEARS IN
संबंधित प्रश्न
Why are solids rigid?
Why do solids have a definite volume?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
Define the term ‘amorphous’.
‘Stability of a crystal is reflected in the magnitude of its melting points.’ Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?
Amorphous solids are also known as ____________.
Most crystals show good cleavage because their atoms, ions or molecules are ____________.
“Crystalline solids are anisotropic in nature″. What is the meaning of anisotropic in the given statement?
The sharp melting point of crystalline solids is due to ______.
Why some glass objects from ancient civilisations are found to become milky in appearance?
Amorphous solids are ______.
Which of the following is true about the value of refractive index of quartz glass?
Amorphous solid can also be called:
(i) pseudo solids
(ii) true solids
(iii) supercooled liquids
(iv) supercooled solids
The property of crystalline solid is not ______.
An ionic solid AB2 isomorphous to the rutile structure (a tetragonal system with the effective number of formula units = 2) has edge lengths of the unit cell of 4Å, 4Å and 7Å. The density of the substance is ______ mg/cc. (if its formula weight is 80. The NA = 6 × 1023 and express your answer in mg/cc using four significant digits.)
