Q1: A pitot tube is used to measure

ANS:C - velocity of flow

A pitot tube is used to measure the velocity of flow in a fluid. It is a device used in fluid dynamics to determine the velocity of fluid flow. It works based on the principle of Bernoulli's equation, which relates the pressure in a fluid to its velocity. A pitot tube consists of a small tube facing into the fluid flow. The dynamic pressure of the fluid causes the fluid to rise in the tube. By measuring the height to which the fluid rises, one can determine the dynamic pressure, which is related to the velocity of the fluid. So, the correct answer is: velocity of flow.