**1. Dynamic similarity exists when the model and the prototype have the same**

[A] Length scale ratio and time scale ratio

[B] Length scale ratio and velocity scale ratio

[C] Length scale ratio, time scale ratio and velocity scale ratio

[D] Length scale ratio, velocity scale ratio and force scale ratio

**Answer: Option D**

**2. An orifice is called a large orifice if water head is**

[A] Twice the diameter of the orifice

[B] Five the diameter of the orifice

[C] Four times the diameter of the orifice

[D] Thrice times the diameter of the orifice

**Answer: Option B**

**3. Hot wire anemometer is used for measuring which of the following parameter**

[A] Turbulence

[B] Pressure

[C] Velocity

[D] Discharge

**Answer: Option C**