Q1: Pick up the correct statement from the following :

ANS:C - both (a) and (b)

When the length of the tube is equal to the diameter of the internal mouthpiece, the jet of liquid comes out without touching the sides of the tube. This phenomenon occurs when the length of the tube is carefully matched to the diameter of the internal mouthpiece, allowing the liquid to exit without touching the sides of the tube. It's a critical consideration in fluid dynamics, particularly in applications where minimizing contact with the tube walls is important, such as in precise fluid measurements or experiments. The second statement, "When the length of the tube is three times the diameter of the internal mouthpiece, the jet diameter is equal to the diameter of the tube," is not generally true in all cases and is not a consistent characteristic of fluid behavior. Therefore, the correct choice is option (a): When the length of the tube is equal to the diameter of the internal mouthpiece, the jet of liquid comes out without touching the sides of the tube.