fluid dynamics

The relation between the temperature and viscosity of liquids and gases is

• Direct and inverse

• direct and direct

• inverse and direct

• inverse and inverse

What is the relation between velocity of the molecules and drag force?

• directly proportional

• inversely proportional

• no realation

• All of these

The force that exerted by the molecules of the fluid is;

• Zero

• maximun

• minimum

• depend on the speed

An incompressible fluid with streamline flow having no viscosity is called:

• viscous fluid

• An ideal fluid

• real fluid

• None of these

The product of cross-sectional area of pipe and fluid velocity is called:

• Rate of flow

• Rate of energy

• rate of viscosity

• none

More the radius ______ drag force.

Less the radius _________ drag force

• Less and more

• more and less

• more and zero

• Less and less

Equation of continuity is based on law of conservation of

• mass

• energy

• momentum

• charge

If cross-sectional area of pipe decrease, what happens to the fluid velocity

• decreases

• increases

• constant

• depends on the fluid density

As speed of the fluid decreases, the pressure of the fluid

• increases

• decreases

• remain same

• may increase or decrease, depends on the viscosity of fluid

A sky diver falls through the air at terminal velocity. The force of air resistance on him is

• Half his weight

• equal to his weight

• twice his weight

• can not be determined from the given information