Q1: Liquids

ANS:B - do not occupy definite shape

The phrase "do not occupy definite shape" refers to the property of liquids that allows them to take the shape of the container they are placed in. Unlike solids, which have a fixed shape and volume, liquids are able to flow and adapt to the shape of their container. Here's an explanation:

1. Shape Adaptation: When you pour a liquid like water into a glass, it takes the shape of the glass. If you pour the same water into a different-shaped container, it will take on that new shape. This property is why liquids are said to have no definite shape of their own.
2. Molecular Arrangement: In a liquid, the molecules are relatively free to move past one another, allowing the liquid to flow. While the molecules still have cohesion, they are not bound in a fixed geometric arrangement as they are in solids. This mobility enables liquids to conform to the shape of the container.
3. Fluidity: The ability of liquids to flow and take the shape of their container is what distinguishes them from solids. Solids have a fixed shape due to the rigid arrangement of their molecules, whereas liquids can flow and adapt due to the less rigid arrangement of their molecules.