CBSE
CLASS 8
SCIENCE LESSON 4 METALS AND NON METALS
Q.1. GALVANISATION IS
Q2.ANODISING IS
Q.3.WHICH OF THE FOLLOWING IS AN ALLOY OF IRON
Q.4.THE REDUCING ACTIVITY OF SODIUM IS REDUCED BY
Q.5.THE HARDEST KNOWN SUBSTANCE IS
Q.6.NON METALS WHICH FORM OXIDES ARE
Answers
Answer:
HARDEST KNOWN SUBSTANCE IS DIAMOND
Answer:
Q.1 .Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
Q.2.Anodising is an electrolytic process for producing thick oxide coatings, usually on aluminium and its alloys. The oxide layer is typically 5 to 30µm in thickness and is used to give improved surface resistance to wear and corrosion, or as a decorative layer.
Q.3.Invar is an alloy of iron. In this the alloying element is nickel and this alloy has a very low coefficient of thermal expansion.
Q.4.Incorporate foods with potassium like sweet potatoes, potatoes, greens, tomatoes and lower-sodium tomato sauce, white beans, kidney beans, nonfat yogurt, oranges, bananas and cantaloupe. Potassium helps counter the effects of sodium and may help lower your blood pressure.
Q.5.Currently, diamond is regarded to be the hardest known material in the world.
Q.6.Metals form oxides that are basic , but non-metals form oxides that are acidic . For example, sulfur and carbon are both non-metals. They react with oxygen to form sulfur dioxide and carbon dioxide. These compounds are both gases present in the air and which dissolve in rain water, making it acidic.
Explanation:
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