The drag force acts in opposite direction to that of relative flow velocity. It acts in opposite direction with respect to a surrounding fluid flow. Thus, correct option is D = Cd * A * 0.5 * r * V².

Specific mass can be written dimensionally by [M][L]-3[T]⁰. This is by adopting basic SI or MKS units. Where, [M] is mass, [L] is length and [T] is time. Thus, correct option is [M][L]^-3[T]⁰.

The pump casting test starts with inspection of material. It is a Non-destructive testing method. It is completed after completion of casting inspection. It depends on pump design.

Kinematic similarity is defined as similarity between motion of model and prototype. It exists in between model and prototype. The points in model and prototype are of same magnitude.

Rayleigh?s method is a basic method for finding functional relationship. The functional relationship is found with respect to a physical parameter. It is illustrated using MLT system.

Viscous force is force that is developed due to resistance of a fluid flow. Viscous force is equal to product of shear stress due to viscosity and surface area of fluid. It acts in opposite direction to that of acceleration.

Dynamic viscosity can be written dimensionally by [M][L]-1[T]^-1. This is by adopting basic SI or MKS units. Where, [M] is mass, [L] is length and [T] is time. Thus, correct option is [M][L]^-1[T]^-1.

Buoyancy, drag and lift are three major fluid forces. These forces have significant importance in various applications. For example: Shotput, badminton, cricket, baseball, cycling, swimming etc.

Elastic force is a force that is developed by a material to retain to its original position. It regains its shape after a period of time. When an elastic material is compressed or stretched, it develops an elastic force.

Pump Mechanical run test is performed for nearly 4 hours. Its main function is to prove that pump works under stable condition. It also helps to determine if all variables are within acceptance range.