| S.R. NO |
Questions |
Answers |
| 1 |
Galvanized iron pipes have a coating of – |
Zinc |
| 2 |
The plates of galvanized iron remain protected from rust because of the existence of – |
Zinc |
| 3 |
What is essential in the corrosion of iron metal? |
Oxygen and moisture |
| 4 |
Which metal is generally used for coating brass utensils to prevent copper contamination? |
Tin |
| 5 |
The aluminium surface is often ‘Anodized’. This means the deposition of a layer of – |
Aluminium Oxide |
| 6 |
Alloy of which metal is used to make aeroplanes and parts of the compartments of the train? |
Aluminium |
| 7 |
Mercury-metal mixture is – |
Mercury mixed alloy |
| 8 |
Which metals does not form amalgam? |
Iron |
| 9 |
Solder used in soldering metal pieces is an alloy of – |
Tin and Lead |
| 10 |
Bronze is an alloy of – |
Copper and Tin |
| 11 |
Bronze is an alloy of copper and – |
Tin |
| 12 |
The percentage of Silver in German Silver is – |
0% |
| 13 |
Which elements is not present in the German Silver? |
Aluminium |
| 14 |
Which alloys has a maximum percentage of Copper? |
Bronze |
| 15 |
Which metal exists as a common component in Brass, Bronze and German Silver? |
Copper |
| 16 |
Brass is an alloy of – |
Copper and Zinc |
| 17 |
Brass is a combination of what metals? |
Copper and Zinc |
| 18 |
Brass gets a faded colour in the air due to the presence of – |
Hydrogen Sulphide |
| 19 |
Combination of which substance in the alloy renders stainless steel non-magnetic? |
Nickel |
| 20 |
To make the steel hard requires an increase in – |
The quantity of Carbon |
| 21 |
What elements are added to iron to produce steel that can resist high temperatures, and have high hardness and abrasion resistance? |
Chromium |
| 22 |
The important metal used with iron to make it rust-free – |
Chromium |
| 23 |
Steel is further processed to obtain stainless steel by adding some elements – |
Silicon |
| 24 |
The important metal used with iron to produce stainless steel is – |
Chromium |
| 25 |
How much carbon does steel contain? |
0.1–2% |
| 26 |
In the case of rusting, the weight of iron – |
Increases |
