Surface Tension

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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?

It increases

It becomes zero

It remains the same

It decreases (correct)

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?

Difference in pressures on two sides of a curved surface Signup and view all the answers

What happens to the liquid in a capillary tube?

It ascends or descends relative to the surrounding liquid Signup and view all the answers

What is the reason for the irregularly shaped camphor to move haphazardly on the surface of pure water?

The irregular shape of camphor dissolves unequally and decreases the surface tension of the water locally. Signup and view all the answers

Why do rain drops tend to acquire a spherical shape?

Each drop tends to acquire minimum surface area. Signup and view all the answers

What happens to the surface tension of a liquid at its boiling point?

It becomes zero. Signup and view all the answers

Why does an oil drop spread on cold water but remain as a drop on hot water?

The surface tension of oil is less than that of cold water and more than that of hot water. Signup and view all the answers

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?

Spherical shape. Signup and view all the answers

What is the direction of the resultant force when the liquid meniscus is concave upward?

Outside the liquid Signup and view all the answers

What is the angle of contact when the liquid wets the solid surface?

Less than 90° Signup and view all the answers

What is the shape of the meniscus when the angle of contact is equal to 90°?

Plane Signup and view all the answers

What is the condition for the liquid to wet the solid surface?

Fa > Fc Signup and view all the answers

What is the tangent of the angle of contact (α) when the resultant force is infinite?

Infinity Signup and view all the answers

What is the angle of contact for water and chromium?

138° Signup and view all the answers

What happens to the angle of contact when the temperature is increased?

It decreases Signup and view all the answers

What is the shape of the meniscus when the angle of contact is 90°?

Flat Signup and view all the answers

What is the effect of partially soluble impurities on the angle of contact?

It decreases the angle of contact Signup and view all the answers

What is the reason for the rise of a liquid in a capillary tube?

The pressure on the concave side of the meniscus is less Signup and view all the answers

What is the primary reason for the difference in pressure at points B and D in the capillary tube?

The angle of contact between the liquid and the capillary tube is not 90° Signup and view all the answers

What is the effect of an increase in temperature on the capillary rise of a liquid in a capillary tube?

The capillary rise increases due to a decrease in surface tension Signup and view all the answers

What is the shape of the meniscus in a capillary tube when the angle of contact is 0°?

Concave upwards Signup and view all the answers

What is the relationship between the radius of the capillary tube and the capillary rise?

The capillary rise is inversely proportional to the radius of the capillary tube Signup and view all the answers

What is the direction of the resultant force when the liquid meniscus is concave upwards and the angle of contact is less than 90°?

Upwards and along the vertical axis of the capillary tube Signup and view all the answers

What is the effect of temperature on the surface tension of a liquid?

It decreases with an increase in temperature Signup and view all the answers

What happens to the surface tension of water when a highly soluble substance like sodium chloride is dissolved in it?

It increases Signup and view all the answers

Why do detergents added to water increase the wetting power of the solution?

Because they decrease the surface tension of water Signup and view all the answers

What is the effect of sparingly soluble substances like phenol on the surface tension of water when dissolved in it?

It decreases the surface tension of water Signup and view all the answers

What is the effect of temperature on the surface tension of a liquid, as given by the relation Tt = T0 (1 - αt)?

The surface tension decreases with an increase in temperature Signup and view all the answers

Surface Tension

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Questions and Answers

What is the range of values for the contact angle between a liquid and a solid?

What happens to the contact angle when the temperature is increased?

What is the effect of soluble impurities on the contact angle?

What is the root cause of capillarity?

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?

Why do rain drops tend to acquire a spherical shape?

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?

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 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 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 angle of contact for water and chromium?

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 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 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 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 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 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?

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)?

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