197. The non-dimensional factor governing viscous or frictional resistance is
A.Reynolds number
B.Weber. number
C.Froude number
D.Mach number

---

198. Euler's dimensionless number relates
A.Pressure force and inertia force
B.Pressure force and viscous force
C.Inertia forde and gravity force
D.Buoyancy force and viscous force

---

199. The rate of change of linear momentum equals
A.Active force
B.Reactive force
C.Torque
D.Work done

---

200. Mach number is the ratio of inertial force to
A.Gravitation force
B.Surface tension
C.Elasticity
D.Viscosity

---

201. Mach number greater than unity implies that the flow is
A.Sonic
B.Subsonic
C.Supersonic
D.Hypersonic

---

202. The component of the force of the fluid on the body (which is generally inclined to the direction of motion of the body) parallel to the direction of motion is called
A.Drag
B.Lift
C.Wake
D.(e) thrust.

---

203. The rate of change of moment of momentum represents the
A.Force exerted by fluid
B.Torque applied by the fluid
C.Work done by the fluid
D.Power developed by the fluid

---