Hii,
When you put salt, sand, iron, and rock in water, they act differently: Salt dissolves in water, forming a solution. Sand does not dissolve. It remains as individual grains in water. Iron can rust in water if exposed to oxygen, although it does not dissolve easily. Rock also does not dissolve in water. It may split into tiny pieces over time, but it remains solid. In brief, salt dissolves in water, but sand, iron, and rock remain largely unchanged.
Question : The metallic contituents of hard water are:
Option 1: Magnesium calcium and tin
Option 2: Iron ,tin and calcium
Option 3: Calcium ,magnesium and iron
Option 4: Magnesium ,tin and iron
Question : Copper wires are generally used for electrical power transmission instead of iron wire because:
Option 1: Copper is cheaper than iron
Option 2: Copper is lighter than iron
Option 3: Copper is a good conductor of electricity than iron
Option 4: Copper can take higher power than iron
Question : Which among the following industries was not in Schedule A of Industrial Policy 1956?
Option 1: Air transport
Option 2: Mining of salt
Option 3: Mineral oils
Option 4: Iron and steel
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