Worksheetsphysical pharmaceutics
Total questions: 15
Worksheet time: 8mins
The boundary between water and gas is called as
liquid gas interface
surface
interface
miscible
What is surface tension defined as?
Density of a liquid
mass/weight of system
pressure exterted on surface
Force acting on the surface of a liquid
Methods used measure surface tension except
Drop Count Method
Wilhelmy Plate Method
Thermal Conductivity Method
Capillary Rise Method
What is the unit of surface tension in the SI system?
kg/m²
N/m
Pa
centipoise
role of surfactant
increases surface tension
increases surface free energy
reduces vapor pressure
reduces surface tension
What is the spreading coefficient (S) when spreading occurs?
S =-2
S = 0
S < 0
S = 1
Granules in tablets having
solid solid interface
solid air surface
surface
solid void interface
Surface tension of water in dyne/cm------
36
86
92
72
surfactants with HLB 13 is considered as
Wetting agents
lipophilic
Detergents
anti foaming
Cetyltrimethylammonium bromide is------type of surfactant
cationic
anionic
hydrophilic
ampholytic
SLS having
bactericidal
bacterial lysis
increasing surface tension
bactriostatic
Surfactant used in shampoo to stabilize foam
anionic
cationic
non ionic
ionic
In charcoal acetic acid acetic acid is
adsorbate
adsorbent
fluorescent
wetiing
Which equation is used to describe multilayer adsorption?
Henry's Law
BET Equation
Langmuir Isotherm
Henry's Law
What is the effect of increasing the length of the hydrocarbon chain in surfactants?
Decreases surface activity
Increases surface activity
No effect on surface activity
Increases toxicity
