ANS:B - any liquid

Cocks, in the context of plumbing and fluid control, are typically used to control the flow of liquids. Here’s why:

• Definition: A cock is a valve or faucet that regulates the flow of liquid by opening or closing a passageway. It is commonly used in plumbing systems to start, stop, or adjust the flow of water or other liquids.
• Types: Cocks can come in various types, such as gate valves, ball valves, globe valves, and so on, each designed for different applications and flow control needs.
• Usage: While the term "cock" can also refer to valves used in other contexts (such as for gases or in industrial applications), in everyday usage and plumbing contexts, cocks are primarily associated with controlling the flow of liquids, particularly water.