Please select a subject first
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Insect moves over the surface of water because of ______.
Concept: Surface Tension
The surface tension of a liquid at critical temperature is ______
Concept: Surface Tension
What is the surface film?
Concept: Fluid and Its Properties
What is the net weight of a body when it falls with terminal velocity through a viscous medium?
Concept: Critical Velocity and Reynolds Number
A square metal plate of area 100 cm2 moves parallel to another plate with a velocity of 10 cm/s, both plates immersed in water. If the viscous force is 200 dyne and the viscosity of water is 0.01 poise, what is the distance between them?
Concept: Critical Velocity and Reynolds Number
The relative velocity between two parallel layers of water is 8 cm/s and the perpendicular distance between them is 0.1 cm. Calculate the velocity gradient.
Concept: Critical Velocity and Reynolds Number
State properties of an ideal fluid.
Concept: Fluid and Its Properties
Compare streamline flow and Turbulent flow.
Concept: Fluids in Motion
A raindrop of radius 0.3 mm falls through the air with a terminal velocity of 1 m/s. The viscosity of air is 18 x 10−6 Ns /m2. Find the viscous force on the raindrop.
Concept: Critical Velocity and Reynolds Number
Explain the phenomena of surface tension on the basis of molecular theory.
Concept: Surface Tension
Obtain an expression for the capillary rise or fall using the forces method.
Concept: Surface Tension
State Stoke’s law and give two factors affecting angle of contact.
Concept: Stokes’ Law
A liquid rises in glass capillary tube upto a height of 2.5 cm at room temperature. If another glass capillary tube having radius half that of the earlier tube is immersed in the same Liquid, the rise of liquid in it will be _______.
Concept: Capillarity and Capillary Action
State the formula for critical velocity in terms of Reynold's number for a flow of a fluid.
Concept: Critical Velocity and Reynolds Number
Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.
Concept: Surface Tension
If ‘θ’ represents the angle of contact made by a liquid which completely wets the surface of the container then ______.
Concept: Angle of Contact
Define the coefficient of viscosity.
Concept: Viscous Force or Viscosity
State the formula and S.I. units of coefficient of viscosity.
Concept: Viscous Force or Viscosity
Calculate the work done in blowing a soap bubble to a radius of 1 cm. The surface tension of soap solution is 2.5 × 10−2 N/m.
Concept: Surface Tension and Surface Energy
The dimensional formula of surface tension is ______.
Concept: Molecular Theory of Surface Tension
