Manufacturing of Glass

Q.

What is an example of deposition?

Q. Arrange the steps involved in the manufacture of glass in a correct sequence.

1. Preparing batch
2. Melting
3. Moulding
4. Annealing

Q. Identify the correct steps involved in the manufacturing of glass.

1. Preparing batch $\to$ Melting$\to$ Moulding $\to$ Annealing
2. Melting $\to$ Preparing batch $\to$ Moulding $\to$ Annealing
3. Preparing batch $\to$ Melting $\to$ Annealing $\to$ Moulding
4. Annealing $\to$ Preparing batch $\to$ Melting $\to$ Moulding

Q. Quenching increases hardness of steel.

1. True
2. False

Q. Which of the following statements are true with respect to the process of annealing?

1. It removes internal stress of a substance.
2. It increases toughness of a substance.
3. It increases the flexibility of a substance.
4. None of the above.

Q.

Why it is not advisable to use aluminum polish on anodized surfaces?

1. Colour is lost

2. Oxide coat is removed

3. Forms a layer of oxide

4. None of the choices

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Describe the process for the production of Lime-soda glass. [3 Mark]

Q.

Which of the following substance is responsible for the bluish-green colour of glass?

1. Ferric compound

2. Cobalt compound

3. Calcium carbonate

4. Chromium compound

Q. When $C{O}_2$ is passed through lime water, it turns milky. Identify the cause of the milkiness.

1. Formation of $Ca(OH{)}_2$
2. Formation of $H_{2}O$
3. Formation of $CaC{O}_3$
4. Formation of $H_2$

Q.

Question 18
A bucket made of plastic does not rust like a bucket made of iron. Why?

Q. Raw materials used in the preparation of glass are:

1. $Sand\left(Si{O}_2\right)$
2. $Sodaash\left(N{a}_{2}C{O}_3\right)$
3. $Limestone\left(CaC{O}_3\right)$
4. $NaC{O}_2$

Q. The technique in glass making that leads to increased durability of the glass is

1. Annealing
2. All of these
3. Heating
4. Grinding

Q.

If a glass is blue in colour, which additional compound does it contain?

1. Ferric compound

2. Chromium compound

3. Cobalt compound

4. Nickel salts

Q. How can coloured glass be obtained from molten glass? Name the chemical compounds to be added to molten glass to obtain the blue coloured glass.

Q. Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as :

1. case hardening
2. tempering
3. annealing
4. sherardising

Q. A blue colour can be imparted to glass by use of:

1. $F{e}_2{O}_3$
2. $CoO$
3. $NiO$
4. $C{u}_{2}O$

Q.

To avoid derailment of the train, small _______are left in between the rails.

Q. Which among the following material is not used in the manufacturing of glass?

1. Sand
2. Soda ash
3. Limestone
4. Charcoal

Q. Which of the following imparts purple colour to glass?

1. $C{r}_2{O}_3$
2. $AuC{l}_3$
3. $Mn{O}_2$
4. $C{u}_{2}O$

Q. In the manufacture of glass, the addition of $Mn{O}_2$ gives:

1. yellow colour
2. red colour
3. violet colour
4. pink colour

Q. Which of the following statements are true with respect to the process of annealing?

1. It removes internal stress of a substance.
2. It increases toughness of a substance.
3. It increases the flexibility of a substance.
4. None of the above.