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WorksheetsSurface tension and Surface energy
Total questions: 12
Worksheet time: 24mins
Surface tension may be defined as
The work done per unit area in increasing the surface area of a liquid under isothermal condition
The work done per unit area in increasing the surface area of a liquid under adiabatic condition
The work done per unit area in increasing the surface is of a liquid under both isothermal and adiabatic conditions.
Free surface energy per init volume
What's the difference between Cohesion and Adhesion?
Cohesion is the attraction between the same substance and Adhesion is the attraction of different substances
they both attract different substances
They both attract the same substance
They don't attract anything
Which of the following contribute to the reason behind the origin of surface tension?
only cohesive forces
only adhesive forces
neither cohesive forces nor adhesive forces
both cohesive forces and adhesive forces
A soap film is trapped between a frame and a wire of length 10 cm as shown.If the surface tension is given as 0.0049 N/m, what will be the value of m (in mg) such that the wire remains in equilibrium?
0.1
1
10
100
Which is the effect of increase in the temperature on the surface tension of the liquid?
it decreases
it increases
it remains the same
None of the above
What is the main cause of capillarity?
difference in weight of fluids
pressure difference
temperature difference
velocity gradient
What is the shape of meniscus when angle of contact is greater than 90°?
Concave
Convex
Plane
None of the above
When a liquid rises inside a capillary tube, the weight of the liquid in the capillary tube is supported
Entirely by atmospheric pressure
Entirely by the force due to surface tension
Partly by the force due to surface tension and partly by atmospheric pressure
Entirely due to the upward component of the reaction (R) to the surface tension
Which of the following is an application of surface tension?
Use of soaps and detergents as cleansing agents
Molecular structure can be elucidated by surface tension measurements through parachor values
Surfactants are incorporated in preparations like toothpaste
All of the mentioned
The surface energy of a substance is defined as …
the energy required for the formation of a new unit area of surface.
the strength of the bonds that hold the substance together.
the energy released when a new unit area of surface is created.
the extent to which water wets the surface of the substance at room temperature.
Which list shows the substances in order of increasing surface energy?
Diamond, zinc, water, polyethene
Polyethene, water, diamond, zinc
Water, polyethene, zinc, diamond
Polyethene, water, zinc, diamond
A hydrophilic surface would be expected to have a …
low surface energy and be water repelling.
low surface energy and be water attracting.
high surface energy and be water repelling.
high surface energy and be water attracting.
