Types of Glass and Its Uses

Q.

Glass is called super cooled liquid. Give reason.

Q.

Give an example of mixture of liquid-gas.

Q. Which glass is known as water glass and why?

Q. Which of the following glass is used in light bulbs and tubes?

1. Optical
2. Lead
3. Borosilicate
4. Processed

Q.

The constituents of soft glass?

Q. Select the correct statements for alkali silicate glass.

1. Mixture of sand and soda
2. Show minimum expansion on heating
3. Soluble in water
4. Mixture of sand, soda, limestone and lead oxide

Q.

Why is crystal better than glass?

Q. Glass bottles used for storage of medicines are made up of ________ glass.

1. optical
2. borosilicate
3. lead
4. frosted

Q. What is a pencil lead actually made up of?

Q.

4) Pyrex or borosil glass is used for making laboratory apparatus , whereas crown glass is used in manufacture of optical instruments. Give a reason for the same.

Q.

Materials that show very small plastic range beyond elastic limit are called ________.

Q. Which of the following statements are true for different types of glasses:

1. Silica glass is used in laboratory glass wares.
2. Borosilicate glass is used to make light bulbs.
3. Medicine bottles is made using lead glass.
4. Optical glass is used to make microscope lens.

Q.

Does the glass have high thermal conductivity?

Q.

Flash freezing protects________________food items.

Q.

Define Efflorescence?

Q.

Can solids diffuse.Why or why not?

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why is silica glass used to prepare laboratory glass-wares? [2 Mark]

Q. Which of the following properties of water proves it be a compund?

1. Water is produced by the chemical combination of hydrogen and oxygen.
2. Constituents of water are not easily separated.
3. Water is homogeneous.
4. None of the above.

Q. Which glass is known as water glass and why?

Q. For the manufacture of glass, various steps are given below. Arrange the steps in a proper sequence
(a) Melting of raw materials
(b) Adding cullet to raw materials
(c) Conversion of raw material to a fine powder
(d) Annealing
(e) Refining

1. a b c d e
2. b a c e d
3. b a e d c
4. c b a e d

Q. Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from the synthetic material? Advise Rana, giving your reason.

Q. Glass is a homogeneous mixture of super-cooled molten sodium silicate and calcium silicate.

1. True
2. False

Q. When wire glass is hit, it prevents pieces of glass from falling or spreading after breaking. Wire glass contains:

1. a network of steel wire
2. a sheet of nylon net
3. cobalt
4. a sheet of fibre glass

Q. Give reason.
(a) Annealing process is carried out in glass manufacture.
(b) Vinyl plastic is used in preparing safety glass.

Q.

Which of the following is used for the preparation of neon sign tubings?

1. Pyrex glass

2. Potash lime

3. Bohemian glass

4. Lead glass

Q.

19) _______ glass is used as wind shield of automobiles.

Q. Colours can be imparted to glass on adding certain salts.

1. True
2. False

Q. Annealing of glass is done to:

1. make it opaque
2. none of the above
3. make it brittle
4. make it transparent

Q. Glass is made up of:

1. silica
2. limestone
3. calcium carbonate
4. all of the above

Q. The type of glass which consists of a layer of plastic embedded in between two layers of glass is called _________ (hard/safety) glass.