Mechanical properties of fluids

If the flow has to be streamline then what Should be the Reynolds number?

• Less than 1000

• Less than or equal to 1000

• More than 1000

• Between 1000 and 2000

According to the equation of continuity what is the relationship between velocity of fluid and area of crossection

• Velocity should be greater than the product of distance and area

• Velocity is inversely proportional to area of crossection

• Velocity is less than the square root of area and distance covered by fluid

• Velocity is directly proportional to area of crossection

For an incompressible fluid what remains same throughout the flow

• Mass of fluid

• Velocity of fluid

• Area covered by the fluid

• None of the above

According to Bernoulli’s principle what should remain constant?

• Product of Pressure and Volume

• Sum of area and velocity of fluid

• Sum of pressure , kinetic energy per unit volume and potential energy per unit area

• Sum of pressure , kinetic energy per unit volume and potential energy per unit volume

If flow of liquid is horizontal , how does speed affect the pressure ?

• Speed increases then pressure increases

• No effect

• Speed increases then pressure decreases

• Speed becomes negative then pressure becomes positive

Bernoulli’s principle is the form of which law ?

• Law of conservation of momentum

• Newtons third law of motion

• Newton’s second law of motion

• Law of conservation of energy

Viscous force acting on a sphere falling through a medium depends on velocity of sphere , viscosity of medium and which other factor?

• Volume of sphere

• Mass of sphere

• Amount of fluid displaced when dropped in a liquid

• Radius of sphere

Terminal velocity is defined as ?

• Variable maximum velocity acquired by a body moving through a viscous medium , when the sum of its weight , buoyant force and viscous force becomes zero

• Constant maximum velocity acquired by a body moving through a viscous medium , when the product of its weight , buoyant force and viscous force becomes zero

• Variable maximum velocity acquired by a body moving through a viscous medium , when the product of its weight , buoyant force and viscous force becomes zero

• Constant maximum velocity acquired by a body moving through a viscous medium , when the sum of its weight , buoyant force and viscous force becomes zero

What does coefficient of viscosity depend upon?

• Mass of particles in fluid

• Velocity of particles in fluid

• Nature of fluid

• Area of crossection covered by fluid

Who gave the formula to find speed of efflux?

• Bernoulli

• Torrici

• Archimedes

• None of the above