Cohesive Force

Q.

What is adhesive force?

Q.

The coating used on raincoats is waterproof because ___.

1. it reduces the adhesive forces

2. it increases the adhesive forces

3. the water is absorbed by the coating

4. it increases the cohesive forces

Q.

why is glass or china ware is packed with straw?

Q.

The force exerted between the molecules of different substances is called

1. Intermolecular forces

2. force of cohesion

3. force of repulsion

4. force of adhesion

Q.

The meniscus of mercury in the capillary tube is

1. Convex

2. Concave

3. Plane

4. Uncertain

Q.

Cohesive force is the force of attraction of molecules of different types of substance.

1. True

2. False

Q.

Coatings used on raincoat are waterproof because

1. Water is absorbed by the coating

2. Cohesive force becomes greater

3. Water is not scattered away by the coating

4. Angle of contact decreases

Q. The force which exists between particle of same kind of substance called cohesion force.

1. True
2. False

Q.

explain why angle of contact of mercury with glass is obtuse while water with glass is acute.?

Q. Match the following based on the capillarity.

1. Capillary rise
2. Cohesive > Adhesive
3. Capillary depression
4. Cohesive < Adhesive
5. Flat surface
6. Cohesive = Adhesive

Q. why aluminum cation has smaller size than magnesium cation.