CERAMICS
Read the following passage and answer the questions that follow:
Ceramics have a number of uses right from making the walls of the houses or insulating cables on overhead power lines to mending broken teeth. Ceramics are divided into two groups. In the first group, which includes pottery and bricks are materials that are moulded into their shape before being heated. In the second group, which includes glass and cement, materials are shaped after being treated by heat. Glass is very useful as it is easily shaped, is rustproof, and forms hard transparent objects that are not affected by chemicals. It is also very cheap to make and can be recycled over and over again. Glass has a wide range of uses because its properties can be changed by adding chemicals and by adding other materials such as the wire. Its uses depend upon the way it is regulated to cool down tinder certain conditions.
(a) What are the uses of ceramics?
(b) What is the difference between the materials in the first group and the second group?
(c) Explain `easily shaped’ and ‘rust proof.
(d) How can the properties of glass be changed?
(e) Find out a word from the passage which has the same meaning as `repair’.
Ans. (a) (i) for making the walls.
(ii) insulating cables.
(iii) mending broken teeth.
(b) (i) shaped before being heated, (group I ).
(ii) shaped after being heated, (group 2).
(c)(i)easily shaped—because of the flexibility of the material it is easy to give it any shape.
(ii) rustproof—It does not get rusted.
(d)(i) By adding chemicals
(ii) By adding other materials such as a wire.
(iii) By controlling the way glass cools down.
(e) Mending.
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