Podcast
Questions and Answers
What is the range of values for the contact angle between a liquid and a solid?
What is the range of values for the contact angle between a liquid and a solid?
- Between 45o and 135o
- Between 0o and 180o (correct)
- Between 90o and 270o
- Between 0o and 90o
What happens to the contact angle when the temperature is increased?
What happens to the contact angle when the temperature is increased?
- It increases
- It becomes zero
- It remains the same
- It decreases (correct)
What is the effect of soluble impurities on the contact angle?
What is the effect of soluble impurities on the contact angle?
- It decreases the contact angle
- It has no effect on the contact angle
- It increases the contact angle (correct)
- It makes the contact angle zero
What is the root cause of capillarity?
What is the root cause of capillarity?
What happens to the liquid in a capillary tube?
What happens to the liquid in a capillary tube?
What is the reason for the irregularly shaped camphor to move haphazardly on the surface of pure water?
What is the reason for the irregularly shaped camphor to move haphazardly on the surface of pure water?
Why do rain drops tend to acquire a spherical shape?
Why do rain drops tend to acquire a spherical shape?
What happens to the surface tension of a liquid at its boiling point?
What happens to the surface tension of a liquid at its boiling point?
Why does an oil drop spread on cold water but remain as a drop on hot water?
Why does an oil drop spread on cold water but remain as a drop on hot water?
What is the shape acquired by the detached portion of the liquid metal when it breaks up after being poured into water from a suitable height?
What is the shape acquired by the detached portion of the liquid metal when it breaks up after being poured into water from a suitable height?
What is the direction of the resultant force when the liquid meniscus is concave upward?
What is the direction of the resultant force when the liquid meniscus is concave upward?
What is the angle of contact when the liquid wets the solid surface?
What is the angle of contact when the liquid wets the solid surface?
What is the shape of the meniscus when the angle of contact is equal to 90°?
What is the shape of the meniscus when the angle of contact is equal to 90°?
What is the condition for the liquid to wet the solid surface?
What is the condition for the liquid to wet the solid surface?
What is the tangent of the angle of contact (α) when the resultant force is infinite?
What is the tangent of the angle of contact (α) when the resultant force is infinite?
What is the angle of contact for water and chromium?
What is the angle of contact for water and chromium?
What happens to the angle of contact when the temperature is increased?
What happens to the angle of contact when the temperature is increased?
What is the shape of the meniscus when the angle of contact is 90°?
What is the shape of the meniscus when the angle of contact is 90°?
What is the effect of partially soluble impurities on the angle of contact?
What is the effect of partially soluble impurities on the angle of contact?
What is the reason for the rise of a liquid in a capillary tube?
What is the reason for the rise of a liquid in a capillary tube?
What is the primary reason for the difference in pressure at points B and D in the capillary tube?
What is the primary reason for the difference in pressure at points B and D in the capillary tube?
What is the effect of an increase in temperature on the capillary rise of a liquid in a capillary tube?
What is the effect of an increase in temperature on the capillary rise of a liquid in a capillary tube?
What is the shape of the meniscus in a capillary tube when the angle of contact is 0°?
What is the shape of the meniscus in a capillary tube when the angle of contact is 0°?
What is the relationship between the radius of the capillary tube and the capillary rise?
What is the relationship between the radius of the capillary tube and the capillary rise?
What is the direction of the resultant force when the liquid meniscus is concave upwards and the angle of contact is less than 90°?
What is the direction of the resultant force when the liquid meniscus is concave upwards and the angle of contact is less than 90°?
What is the effect of temperature on the surface tension of a liquid?
What is the effect of temperature on the surface tension of a liquid?
What happens to the surface tension of water when a highly soluble substance like sodium chloride is dissolved in it?
What happens to the surface tension of water when a highly soluble substance like sodium chloride is dissolved in it?
Why do detergents added to water increase the wetting power of the solution?
Why do detergents added to water increase the wetting power of the solution?
What is the effect of sparingly soluble substances like phenol on the surface tension of water when dissolved in it?
What is the effect of sparingly soluble substances like phenol on the surface tension of water when dissolved in it?
What is the effect of temperature on the surface tension of a liquid, as given by the relation Tt = T0 (1 - αt)?
What is the effect of temperature on the surface tension of a liquid, as given by the relation Tt = T0 (1 - αt)?
