Question

state a specific reason for using:-
a). steel in automobiles
b).gold in jwellery
c). lead in bullets
d). copper in elctrical cables ​

Answer 1

Answer:

Explanation:

(a) It is malleable with high tensile strength.

(b) It is expensive, lustrous, malleable and ductile.

(c) It is a good conductor of electricity.

(d) It prevents rusting

(e) It has high specific gravity

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Answer 2

a). steel in forms needed to create the chassis and body panels of automobiles. Steel is able to be poured into molds and cooled to create other forms, such as an engine block. And steel is easy to bond together using welding techniques.

b).gold in jwellery

Gold is used to make jewellery because the metals used in jewellery are always be chosen on the basis of its reactivity. It should be unreactive so that the metal does not tarnish. Many metals used for jewellery are expensive as well because they are rare.

Gold is used to make jewellery because of the following reasons.

They are highly lustrous metals which are resistant to corrosion.

They are highly malleable and ductile so can be transformed into any shape or design.

The main reason is that gold is not readily oxidized by oxygen or other nonmetals, they do not tarnish readily.

d). copper in elctrical cables

The lower the level of resistivity, the more electrical conductivity a metal has. Copper has low resistivity, and therefore is an excellent conductor.

Copper coiling Copper is also less oxidative than other metals.

The photo is for reason for lead in bullets.

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