Question

C) Read the passage and answer the questions given below.-
We use the glass material on large scale in our daily life. Glass
was discovered by chance. Some Phoenician traders were cooking
in desert. The cooking vessels were supported on lime-stones.
When the cooking vessel was kept off the lime-stone, they observed
that a transparent material has been formed. They thought that
this transparent material may had been formed due to heating
together of sand and limestone. This led to the development of
technique of glass production. Glass is the non-crystalline, hard
but brittle solid material formed from mixture of silica and silicate.
Silica i.e. Sioz to which we refer to as sand. Depending upon the
proportion of silica and other components in the glass; there are
different types of glass as soda-lime glass, boro-silicate glass, silica
glass, alkali-silicate glass etc.,
Qus.:-1) What is meant by glass?
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Answer 1

Answer:

Glass is the non-crystalline, hard

but brittle solid material formed from mixture of silica and silicate.

Answer 2

Answer:

Glass is the non-crystalline, hard

but brittle solid material formed from mixture of silica and silicate.