Q1: As the fluid flow rate increases, the float of the rotameter

ANS:A - rises in the tube.

"rises in the tube" in the context of a rotameter, we're describing the upward movement of the float within the tapered tube of the rotameter device as the fluid flow rate increases. Here's a more detailed explanation:

1. Tapered Tube: The rotameter typically consists of a tapered tube through which the fluid flows. This tube is wider at the bottom and narrower at the top.
2. Float: Inside the tube, there's a float, usually a small, spherical or cylindrical object, which is less dense than the fluid it's measuring. The float is free to move up and down within the tube.
3. Buoyant Force: As the fluid flows through the rotameter, it exerts an upward force on the float due to buoyancy. This buoyant force is directly proportional to the fluid flow rate—higher flow rates exert greater upward forces on the float.
4. Equilibrium: At lower flow rates, the buoyant force is less, and the float settles at a lower position within the tube. However, as the flow rate increases, the buoyant force also increases, causing the float to rise higher in the tapered tube.
5. Measurement: The position of the float within the tube corresponds to specific flow rates. The height of the float relative to markings on the tube provides a visual indication of the flow rate of the fluid passing through the rotameter.