Correct Answer - Option 3 : Venturimeter
Explanation
A venturi-meter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. It works on the venturi effect which states that there is a reduction in fluid pressure when a fluid flows through a constricted section (or choke) of a pipe.
Odometer: It is the instrument attached to the wheel of a vehicle in order to measure the distance travelled.
Speedometer: It is a device attached in vehicle to measure the instantaneous velocity of the vehicle.
