Ans. Light , bulbs , bottles , jars , glasses , reading glasses , marbles , windows panes , etc .
( 2 ) What you can do with hot liquid glass .
Ans . We can pour hot liquid glass , mould it , roll it , press it or even blow it .
3) Name of colours.
Ans. Glass can be given many beautiful colours - blue , violet , turquoise , ruby red , pink , amber , orange , deep yellow , purple , amethyst , dark green , even black and white.
Q.2 Guess the meaning of the following words from the passage:
a) molten :- heated to a very high temperature so that it becomes liquid.
b) transparent :- allowing you to see through.
c) impermeable :- not allowing a liquid or gas to pass through.
d) impart :- to pass something to somebody or something.
e) recyclable :- something that can be recycled; that is used again after certain treatment.
Q .3 Write short notes on the following:
( 1 ) How glass is made .
Ans . Glass is made by heating a mixture of clean white sand and chemicals like soda and lime . The mixture is heated in a furnace till it turns into hot , liquid glass . When it cools down , it becomes stiff and hard .
( 2 ) How glass is shaped .
Ans . Glass is shaped into different articles when it is still hot and soft . It can be poured into moulds , rolled out , floated on a bed of molten metal , blown into shapes or even drawn out into fibres .
( 3) Some properties of glass.
Ans. Glass is transparent , it is strong and hard , it dose not allow water or other liquids to pass through and doesn't get soggy or stained and it doesn ' impart a smell or taste .
( 4) Coloured glass.
Ans. It is possible to make ordinary glass into colour and transparent glass by using different combination of chemicals in the glass making process . Glass can be given many beautiful colours like blue , violet , turquoise etc.
