30 Questions
What is the relationship between excess pressure and the radius of a bubble or drop?
Inversely proportional
What happens when two bubbles of different sizes are put in communication with each other?
Air rushes from the smaller bubble to the larger bubble
What is the shape of the free surface of a liquid at rest?
Perpendicular to the resultant force
What is the angle of contact between a liquid and a solid defined as?
The angle between the tangents to the liquid surface and the solid surface inside the liquid
What is the shape of a liquid meniscus in a pure water and silver coated capillary tube?
Convex upward
What is the primary reason why a small irregular piece of camphor floats on the surface of pure water and dances about?
It dissolves unequally and decreases the surface tension of the water locally
Why do rain drops take on a spherical shape?
Due to the surface tension of the water
What happens to the surface tension of a liquid as its temperature increases?
It decreases
Why does oil spread on cold water but remain as a drop on hot water?
Because the surface tension of oil is less than that of cold water
Why do the hairs of a shaving brush or painting brush stick together when taken out of water?
Due to the surface tension of the hair
When n small drops of radius r coalesce to form a big drop of radius R, what happens to the surface area of the liquid?
It decreases
What is the formula for the amount of surface energy released when n small drops of radius r coalesce to form a big drop of radius R?
4πT(nr² - R²)
What happens to the temperature of a big drop if the released energy is absorbed by it?
It increases
What is the excess pressure inside a bubble or drop due to?
Surface tension
What is the formula for the velocity of a big drop if the released energy is converted into kinetic energy?
v = √(4πR²T/(r - R))
What happens to the surface energy of a liquid when its surface area decreases?
It decreases
Why do soap films exhibit colorful patterns?
Due to the interference of light
What is the primary reason for work being done against surface tension when a liquid is stretched?
To increase the surface area of the liquid
When a large drop of liquid splits into smaller droplets, what happens to its surface area?
It increases
What is the primary reason for the formation of bubbles in a liquid?
Due to the difference in pressure
When a soap film is stretched, what happens to the surface energy of the film?
It decreases
What is the primary reason why a bubble or drop tends to contract?
Due to the property of surface tension
What is the work done against surface tension when a big drop of radius R is formed from n small drops of radius r?
4πT(nr^2 - R^2)
What happens when a big drop of radius R is formed from n small drops of radius r?
The surface area of the liquid decreases
What is the change in temperature of a big drop when the released energy is absorbed by it?
∆θ = JSd / 4πTR
When a big drop of radius R breaks into n small drops of radius r, what happens to the surface energy of the liquid?
The surface energy increases by a factor of n
What is the direction of the resultant force at the point of contact between a liquid and a solid, when the angle of contact is obtuse?
Directed inside the liquid
What is the shape of the soap film formed when two identical circular frames are placed in parallel and separated by a small distance, with the frames being dipped in a soap solution?
Parabolic
When a liquid drop is split into two smaller drops, what is the relationship between the work done against surface tension and the change in surface area?
The work done is proportional to the change in surface area
What is the condition for a bubble to be stable in a liquid?
The excess pressure inside the bubble is greater than the surrounding pressure
This quiz covers the concept of surface tension and its effects on bubbles and droplets. Learn how the pressure inside a bubble relates to its size and what happens when two bubbles of different sizes interact. Test your understanding of surface tension and its applications.
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