Physical Property of Metal - Hardness
Physical Property of Metal - Hardness
Hardness of Metals
Hardness can be defined as the resistance to penetration . Most metals are hard but some (e.g. sodium and potassium) are so soft that they can be cut with a knife(eg: Galllium, tin, indium, lead etc.)
Metals are Generally Hard. This means that most of the metals cannot be cut easily.
Though most of the metals are hard but their. hardness varies from one metal to another. For example, if we try to cut a thin sheet of iron metal with a pair of scissors, we will find that it is very, very difficult to cut the sheet of iron. This is because iron metal is very hard. On the other hand, a thin sheet of aluminium metal can be cut easily by using scissors. This means that aluminium metal is less hard.
Which of the following metals can be cut with knife? | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Hardness can be defined as the resistance to penetration . (b) Iron is an hard metal that exist in the nature. (c) Sodium and potassium metals are soft and can be easily cut with a knife. | |||
| Right Option : D | |||
| View Explanation | |||
Metals are generally | |||
| Right Option : B | |||
| View Explanation | |||
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