Intermolecular forces: cohesive and adhesive forces - class-XI
Intermolecular forces: cohesive and adhesive forces
Questions
Which of the following is associated with liquid only and not for the gases?
- Pressure
- Volume
- Density
- Surface tension
The property of fluid which enables it to resist tensile stress is known as
- compressibility
- surface tension
- cohesion
- adhesion
A wire 10 cm long is placed horizontally on the surface of water. It is gently pulled up with a force of $1.4 \times 10^{-2}$ N to keep it in equilibrium. The surface tension of water is
- 50 dyne /cm
- 60 dyne/cm
- 70 dyne/cm
- 40 dyne/cm
Property of fluid by which its own molecules are attracted is called
- adhesion
- cohesion
- viscosity
- compressibility
Attractive forces of cell walls for water molecules is termed as
- Adhesion
- Cohesion
- Osmosis
- Plasmolysis
The surface tension and vapour pressure of water at $20^oC$ is 7.28$ \times10^{ -2 }$ N/m and $2.33 \times { 10 }^{ 3 }$ pa, respectively. What is the radius of the smallest spherical water droplet which can from without evaporating at $20^oC$ ?
- $5\times { 10 }^{ -4 }m$
- $6.25\times{10}^{-5}m$
- $9\times{10}^{-2}m$
- $3\times{10}^{-5}m$
Soldering of two metals is possible because of the property of:
- viscosity
- surface tension
- osmosis
- cohesion
Work done in increasing the size of a soap bubble from a radius of $3\ cm$ to $5\ cm$ is nearly (Surface tension of soap solution$=0.03\ {Nm}^{-1}$):
- $0.2\pi\ mJ$
- $2\pi\ mJ$
- $0.4\pi\ mJ$
- $4\pi\ mJ$
If the resultant adhensive force between liquid and solid is smaller than the resultant cohesive then will_______
- partially wets the solid
- does not wets the solid
- completely wets the solid
- does not interact with solid
The dimension of sphere of influence of an molecules is
- $1 A^o$
- $10 A^o$
- $100 A^o$
- $0.1 A^o$
Ball pen and fountain pen depend respectively upon the principle of
- Surface tension and viscosity
- Gravitation and surface tension
- Surface tension and gravity
- Surface tension and surface tension
If $2$ bubble of radius $r _1$ & $r _2$ are combined then find radius of common surface.
- $\dfrac{r _1r _2}{r _1+r _2}$
- $\dfrac{r _1r _2}{r _1-r _2}$
- $\sqrt{r _1r _2}$
- $\dfrac{r _1+r _2}{2}$
A liquid is contained in a vessel. The liquid-solid adhesive force is very as compared to the liquid. The shape of the liquid surface will be
- Horizontal
- Vertical
- Concave
- Convex
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
- mercury is a metal
- density of mercury is greater than that of water
- cohesion of mercury is greater than its adhesion with glass
- cohesion of water is greater than its adhesion with glass
A capillary tube of radius $0.25\ mm$ is submerged vertically in water so that $25\ mm$ of its length outside water. The radius of curvature of the meniscus will be $(T = 7.5\times 10^{-3} N/m)$.
- $0.2\ mm$
- $0.4\ mm$
- $0.6\ mm$
- $0.8\ mm$