Particle size and distribution of powders is mainly studied under?
A
Pharmacodynamics
B
Micromeritics
C
Pharmacokinetics
D
Biopharmaceutics
Question 2Single Answer
Which distribution considers number of particles?
A
Number distribution
B
Weight distribution
C
Volume distribution
D
Density distribution
Question 3Single Answer
Weight distribution of particles mainly emphasizes?
A
Ionic particles
B
Small particles
C
Large particles
D
Dissolved particles
Question 4Single Answer
Average particle size can be expressed using?
A
All of the above
B
Geometric mean diameter
C
Harmonic mean diameter
D
Arithmetic mean diameter
Question 5Single Answer
Optical microscopy is suitable for particle size range?
A
0.5 - 100 mircro m
B
Below 0.1 mircro m
C
Above 1 mm
D
Below 1 nm
Question 6Single Answer
Sieving method is commonly used for particles larger than?
A
5 micro m
B
10 nm
C
500 nm
D
50 micro m
Question 7Single Answer
Sedimentation analysis is based on?
A
Stokes' law
B
Newton's law
C
Boyle's law
D
Charles' law
Question 8Single Answer
Stokes' law is valid for?
A
Turbulent flow
B
Ionic compounds only
C
Dissolved solutes
D
Spherical particles in laminar flow
Question 9Single Answer
Specific surface area is defined as?
A
Surface area per particle
B
Surface area per unit volume
C
Surface area per unit mass
D
Total surface area only
Question 10Single Answer
Permeability method is used to determine?
A
pH
B
Density
C
Colour
D
Surface area
Question 11Single Answer
Adsorption property of powder depends mainly on?
A
Taste
B
Colour
C
Surface area
D
Shape only
Question 12Single Answer
Porosity is given by?
A
Solid volume / Total volume
B
Void volume / Total volume
C
Total mass / Volume
D
Surface area / Mass
Question 13Single Answer
Bulk density is?
A
Mass of powder / True volume
B
Mass of powder / Bulk volume
C
Mass / Surface area
D
Volume / Mass
Question 14Single Answer
Tapped density is measured after?
A
Cooling
B
Heating
C
Mechanical tapping
D
Filtration
Question 15Single Answer
Angle of repose measures?
A
Flow property of powder
B
Compressibility
C
Density
D
Surface energy
Question 16Single Answer
Good powder flow is indicated by angle of repose?
A
Less than 30 degree
B
More than 60 degree
C
45 degree - 60 degree
D
Above 90 degree
Question 17Single Answer
Carr's index is used to measure?
A
Dissolution rate
B
Solubility
C
Compressibility of powder
D
Particle colour
Question 18Single Answer
Carr's index is calculated using?
A
Surface area and mass
B
Weight and volume
C
Bulk and tapped density
D
Particle number
Question 19Single Answer
Hausner ratio is?
A
Tapped density / Bulk density
B
Bulk density / Tapped density
C
Surface area / Volume
D
Mass / Density
Question 20Single Answer
Ideal Hausner ratio for good flow is?
A
5
B
> 2
C
3
D
<1.25
Question 21Single Answer
Packing arrangement of powder affects?
A
Porosity
B
Colour
C
Taste
D
Odour
Question 22Single Answer
Closest packing gives?
A
Maximum porosity
B
Minimum porosity
C
No density
D
Maximum mass
Question 23Single Answer
Derived properties of powder include?
A
Colour only
B
Flow and porosity
C
Taste only
D
Odour only
Question 24Single Answer
Particle shape affects?
A
Taste
B
Chemical composition
C
Flow property
D
Odour
Question 25Single Answer
Spherical particles show?
A
No flow
B
Poor flow property
C
Better flow property
D
Maximum dissolution
Question 26Single Answer
Irregular particles show?
A
High density
B
Better solubility
C
Poor flow
D
Low mass
Question 27Single Answer
Surface roughness increases?
A
Friction between particles
B
Solubility
C
Colour
D
Taste
Question 28Single Answer
Powder rheology studies?
A
Drug metabolism
B
Flow and deformation
C
Drug absorption
D
Drug elimination
Question 29Single Answer
Micromeritics mainly studies?
A
Small particle science
B
Large particle science
C
Biological systems
D
Chemical reactions
Question 30Single Answer
Particle size reduction increases?
A
Weight
B
Volume
C
Density
D
Surface area
Question 31Single Answer
Nanoparticles have?
A
Very high surface area
B
Very low mass
C
Low density
D
No charge
Question 32Single Answer
Laser diffraction measures particle size based on?
A
Electrical resistance
B
Heat conduction
C
Magnetic force
D
Light scattering
Question 33Single Answer
Particle volume can be measured by?
A
Spectroscopy
B
Titration
C
Chromatography
D
Displacement method
Question 34Single Answer
Sedimentation rate increases with?
A
Particle size
B
Viscosity
C
Density of liquid
D
Temperature decrease
Question 35Single Answer
Cohesive forces are dominant in?
A
Large granules
B
Fine powders
C
Liquids
D
Gases
Question 36Single Answer
Adhesive forces occur between?
A
Particle and particle
B
Particles and surfaces
C
Gas molecules
D
Atoms only
Question 37Single Answer
Bulkiness is reciprocal of?
A
Porosity
B
Bulk density
C
Surface area
D
Particle size
Question 38Single Answer
Powder flow is affected by?
A
Odour
B
Colour
C
Taste
D
Moisture content
Question 39Single Answer
Moisture generally causes?
A
Increased solubility only
B
Better flow
C
No effect
D
Poor flow
Question 40Single Answer
Particle agglomeration occurs due to?
A
Electrostatic forces
B
Gravity only
C
Mass only
D
Volume only
Question 41Single Answer
Specific surface area increases when?
A
Volume increases
B
Particle size increases
C
Mass increases
D
Particle size decreases
Question 42Single Answer
Powder compressibility is related to?
A
Odour
B
Colour
C
Taste
D
Porosity
Question 43Single Answer
Flow aids are used to improve?
A
Stability only
B
Drug colour
C
Drug flavour
D
Powder flow
Question 44Single Answer
Milling is used for?
A
Filtration
B
Mixing
C
Size reduction
D
Sterilization
Question 45Single Answer
Sieving efficiency depends on?
A
Odour
B
Colour
C
Taste
D
Mesh size
Question 46Single Answer
Powder technology is important in?
A
Pharmaceutical manufacturing
B
Surgery
C
Radiology
D
Diagnosis
Question 47Single Answer
Particle shape factor affects?
A
Colour
B
Taste
C
Flow and packing
D
pH
Question 48Single Answer
Particle number is determined by?
A
Spectroscopy
B
Chemical reactions
C
Counting methods
D
Titration
Question 49Single Answer
Powder density is important in?
A
Marketing
B
Capsule filling
C
Advertising
D
Sales
Question 50Single Answer
Surface adsorption is important for?
A
Packaging
B
Drug dissolution
C
Labelling
D
Branding
Important Questions Package
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Pharmaceutics / General Medicine
Question 51Single Answer
Flow property improves when particles are?
A
Spherical
B
Irregular
C
Sticky
D
Wet
Question 52Single Answer
Particle settling velocity depends on?
A
Colour
B
Density difference
C
Taste
D
Odour
Question 53Single Answer
Powder rheology is important in?
A
Drug labelling
B
Tablet compression
C
Drug marketing
D
Sales
Question 54Single Answer
Particle size distribution is represented by?
A
Curve graph only
B
Line diagram
C
Pie chart
D
Histogram
Question 55Single Answer
True density is?
A
Surface area / Mass
B
Mass / Bulk volume
C
Volume / Mass
D
Mass / True volume
Question 56Single Answer
True density excludes?
A
Surface
B
Mass
C
Pores
D
Colour
Question 57Single Answer
Powder flow is best when?
A
High cohesion
B
Low cohesion
C
High moisture
D
High adhesion
Question 58Single Answer
Powder porosity increases with?
A
Heating
B
Tight packing
C
High pressure
D
Loose packing
Question 59Single Answer
Adsorption capacity increases with?
A
Increased density
B
Increased mass
C
Increased volume
D
Increased surface area
Question 60Single Answer
Particle interaction forces affect?
A
Colour
B
Flow property
C
Taste
D
Odour
Question 61Single Answer
Powder bulk density is?
A
Mass / Bulk volume
B
Mass / True volume
C
Mass / Surface area
D
Volume / Mass
Question 62Single Answer
Micromeritics is used in?
A
Quality control
B
Marketing
C
Packaging design
D
Advertising
Question 63Single Answer
Powder flow testing is important in?
A
Parenteral nutrition
B
Injection preparation
C
Tablet manufacturing
D
Radiography
Question 64Single Answer
Surface area measurement helps in?
A
Smell
B
Colour
C
Taste
D
Dissolution rate
Question 65Single Answer
Fine particles tend to?
A
Dissolve instantly
B
Flow freely
C
Separate easily
D
Agglomerate
Question 66Single Answer
Powder cohesiveness is due to?
A
Mass
B
Gravity
C
Van der Waals forces
D
Volume
Question 67Single Answer
Powder rheology helps in?
A
Processing
B
Diagnosis
C
Surgery
D
Imaging
Question 68Single Answer
Particle size affects?
A
Marketing
B
Packaging
C
Labelling
D
Bioavailability
Question 69Single Answer
Flow property testing is done using?
A
Chromatography
B
Spectroscopy
C
Titration
D
Funnel method
Question 70Single Answer
Powder technology is used in?
A
Pharmaceutical industry
B
Agriculture only
C
Textile only
D
Electronics only
Question 71Single Answer
Surface energy is higher in?
A
Fine powders
B
Large granules
C
Liquids
D
Gases
Question 72Single Answer
Electrostatic charge affects?
A
Powder flow
B
Colour
C
Taste
D
Smell
Question 73Single Answer
Agglomeration reduces?
A
Smell
B
Taste
C
Colour
D
Flow property
Question 74Single Answer
Particle size measurement by microscopy is limited by?
A
Temperature
B
Cost
C
Resolution
D
Pressure
Question 75Single Answer
Dissolution rate is affected by?
A
Colour
B
Surface area
C
Taste
D
Odour
Question 76Single Answer
Powder bulkiness is measured by?
A
Colour only
B
Mass only
C
Volume only
D
Bulk density inverse
Question 77Single Answer
Sedimentation method is used for?
A
Packaging
B
Tablet coating
C
Capsule filling
D
Suspension particle analysis
Question 78Single Answer
Particle shape affects?
A
Colour
B
Packing efficiency
C
Taste
D
Odour
Question 79Single Answer
Powder flow improves with?
A
Sticky particles
B
Moisture
C
Lubricants
D
High cohesion
Question 80Single Answer
Lubricants mainly reduce?
A
Taste
B
Particle friction
C
Colour
D
Odour
Question 81Single Answer
Packing efficiency increases with?
A
Low density particles
B
Irregular particles
C
Moist particles
D
Uniform particle size
Question 82Single Answer
Particle distribution is useful for?
A
Advertising
B
Marketing
C
Branding
D
Quality control
Question 83Single Answer
Micromeritics is also known as?
A
Drug dynamics
B
Large particle science
C
Drug kinetics
D
Small particle science
Question 84Single Answer
Particle shape determination is done by?
A
Microscopy
B
Titration
C
Spectroscopy
D
Chromatography
Question 85Single Answer
Flow property is best when?
A
High adhesion
B
High friction
C
Low friction
D
High moisture
Question 86Single Answer
Powder rheology is related to?
A
Drug metabolism
B
Drug synthesis
C
Deformation behaviour
D
Drug elimination
Question 87Single Answer
Particle settling depends on?
A
Colour
B
Density and size
C
Taste
D
Odour
Question 88Single Answer
Powder compressibility affects?
A
Colour
B
Tablet hardness
C
Taste
D
Smell
Question 89Single Answer
Particle uniformity improves?
A
Smell only
B
Colour only
C
Taste only
D
Manufacturing efficiency
Question 90Single Answer
Powder flow property is important for?
A
Injection preparation
B
Tablet filling
C
Blood testing
D
Imaging
Question 91Single Answer
Surface area increases with?
A
Size increase
B
Size reduction
C
Density increase
D
Mass increase
Question 92Single Answer
Powder bulkiness is?
A
Directly proportional to density
B
Inversely proportional to bulk density
C
Independent of density
D
Equal to mass
Question 93Single Answer
Particle size reduction is done by?
A
Cooling
B
Heating
C
Milling
D
Filtration
Question 94Single Answer
Milling is used for?
A
Packaging
B
Drug testing
C
Size reduction
D
Labeling
Question 95Single Answer
Sieving depends on?
A
Colour
B
Mesh size
C
Taste
D
Odour
Question 96Single Answer
Powder density is important for?
A
Marketing
B
Capsule filling
C
Advertising
D
Branding
Question 97Single Answer
Particle interaction forces affect?
A
Flow property
B
Colour
C
Taste
D
Smell
Question 98Single Answer
Powder technology is used in?
A
Pharmaceutical manufacturing
B
Clinical diagnosis
C
Surgery
D
Radiology
Question 99Single Answer
Adsorption is important for?
A
Sales
B
Packaging
C
Marketing
D
Drug stability
Question 100Single Answer
Micromeritics studies?
A
Particle science
B
Human physiology
C
Clinical medicine
D
Surgery
Question 101Single Answer
Surface tension of a liquid is caused due to?
A
Adhesive forces
B
Cohesive forces
C
Gravitational forces
D
Magnetic forces
Question 102Single Answer
Surface free energy is related to?
A
Pressure only
B
Volume
C
Temperature only
D
Surface area
Question 103Single Answer
Surface tension is expressed in?
A
kg/m^3
B
N/m
C
Pascal only
D
Joule only
Question 104Single Answer
Interfacial tension occurs between?
A
Two immiscible liquids
B
Gas and vacuum
C
Solid and vacuum
D
Two gases
Question 105Single Answer
Positive spreading coefficient indicates?
A
Evaporation
B
No spreading
C
Spontaneous spreading
D
Condensation
Question 106Single Answer
Surface active agents are also called?
A
Stabilizers
B
Emulsifiers
C
Surfactants
D
Preservatives
Question 107Single Answer
Surfactants reduce?
A
Density
B
Surface tension
C
Volume
D
Mass
Question 108Single Answer
HLB system is used for?
A
Tablet compression
B
Drug metabolism
C
Classification of surfactants
D
Sterilization
Question 109Single Answer
HLB value of 1-3 indicates?
A
Solubilizers
B
Antifoaming agents
C
Emulsifying agents
D
Wetting agents
Question 110Single Answer
HLB value of 8-18 indicates?
A
Water in oil emulsifiers
B
Oil in water emulsifiers
C
Lubricants
D
Preservatives
Question 111Single Answer
HLB value of 3-6 indicates?
A
W/O emulsifiers
B
O/W emulsifiers
C
Detergents
D
Solubilizers
Question 112Single Answer
Solubilization is defined as?
A
Precipitation
B
Decrease in solubility
C
Increased solubility due to micelles
D
Crystallization
Question 113Single Answer
Micelles are formed above?
A
Critical micelle concentration
B
Boiling point
C
Freezing point
D
Melting point
Question 114Single Answer
Detergency mainly depends on?
A
Colour
B
Surface activity
C
Taste
D
Odour
Question 115Single Answer
Adsorption at liquid interfaces occurs due to?
A
Gravity
B
Surface free energy minimization
C
Temperature only
D
Pressure only
Question 116Single Answer
Adsorption is mainly?
A
Thermal phenomenon
B
Bulk phenomenon
C
Surface phenomenon
D
Optical phenomenon
Question 117Single Answer
Adsorption at solid-gas interface is important in?
A
Catalysis
B
Tablet coating
C
Distillation
D
Filtration
Question 118Single Answer
Physisorption involves?
A
Covalent bonds
B
Chemical bonds
C
Weak van der Waals forces
D
Ionic bonds
Question 119Single Answer
Chemisorption involves?
A
No bond formation
B
Chemical bond formation
C
Physical attraction only
D
Thermal expansion
Question 120Single Answer
Adsorption isotherm represents?
A
Adsorption vs concentration relationship
B
Temperature only
C
Pressure only
D
Volume only
Question 121Single Answer
Freundlich adsorption equation is?
A
x/m = k + C
B
x/m = kC^(1/n)
C
x/m = C/k
D
x/m = kC
Question 122Single Answer
Langmuir adsorption assumes?
A
Volume adsorption
B
Multilayer adsorption
C
Bulk adsorption
D
Monolayer adsorption
Question 123Single Answer
Electrical properties of interfaces are studied in?
A
Electrical double layer
B
Magnetic field
C
Optical spectroscopy
D
Thermal analysis
Question 124Single Answer
Zeta potential is related to?
A
Tablet hardness
B
Stability of colloids
C
Drug colour
D
Taste
Question 125Single Answer
Higher zeta potential indicates?
A
Rapid precipitation
B
Less stable system
C
No stability
D
More stable system
Question 126Single Answer
Emulsions are stabilized by?
A
Salts only
B
Acids only
C
Bases only
D
Surfactants
Question 127Single Answer
Emulsifying agents work by?
A
Increasing pressure
B
Increasing viscosity only
C
Increasing temperature
D
Reducing interfacial tension
Question 128Single Answer
Complex films are formed by?
A
Surfactants and proteins
B
Metals only
C
Gases only
D
Salts only
Question 129Single Answer
Surface active agents concentrate at?
A
Gas phase only
B
Bulk solution
C
Bottom of container
D
Interface
Question 130Single Answer
Wetting agents mainly?
A
Increase viscosity
B
Increase contact angle
C
Increase density
D
Reduce contact angle
Question 131Single Answer
Contact angle less than 90 degree indicates?
A
Neutral wetting
B
Poor wetting
C
No wetting
D
Good wetting
Question 132Single Answer
Detergents are mainly?
A
Bases
B
Non-polar solvents
C
Acids
D
Anionic surfactants
Question 133Single Answer
Cationic surfactants are used as?
A
Disinfectants
B
Lubricants
C
Preservatives
D
Solvents
Question 134Single Answer
Nonionic surfactants contain?
A
No charge group
B
Positive charge
C
Negative charge
D
Ionic bond only
Question 135Single Answer
Surface tension decreases with?
A
Pressure increase
B
Temperature increase
C
Density increase
D
Viscosity increase
Question 136Single Answer
Soap is an example of?
A
Nonionic surfactant
B
Cationic surfactant
C
Anionic surfactant
D
Amphoteric solvent
Question 137Single Answer
Amphoteric surfactants contain?
A
No charge
B
Both positive and negative groups
C
Only positive charge
D
Only negative charge
Question 138Single Answer
Emulsion stability is improved by?
A
Increasing pressure
B
Decreasing temperature only
C
Increasing viscosity of continuous phase
D
Reducing particle size only
Question 139Single Answer
Solid-liquid adsorption is important in?
A
Packaging
B
Drug dissolution
C
Marketing
D
Advertising
Question 140Single Answer
Adsorption increases with?
A
Volume increase only
B
Surface area decrease
C
Mass increase only
D
Surface area increase
Question 141Single Answer
Electrical double layer consists of?
A
Only solvent layer
B
Only ionic layer
C
Only molecular layer
D
Stern layer and diffuse layer
Question 142Single Answer
Colloidal stability depends on?
A
Taste
B
Colour
C
Zeta potential
D
Smell
Question 143Single Answer
Surface activity of surfactants depends on?
A
Hydrophilic-lipophilic balance
B
Taste
C
Colour
D
Odour
Question 144Single Answer
Interfacial phenomena occur mainly due to?
A
Temperature only
B
Gravity
C
Surface energy imbalance
D
Pressure only
Question 145Single Answer
Spreading occurs when?
A
Adhesion > Cohesion
B
Cohesion > Adhesion
C
Mass > Volume
D
Density > Pressure
Question 146Single Answer
Wetting agents are used in?
A
Suspensions
B
Tablets only
C
Capsules only
D
Parenterals only
Question 147Single Answer
Foaming is reduced by?
A
Acids only
B
Surfactants only
C
Salts only
D
Antifoaming agents
Question 148Single Answer
Surface tension measurement is done using?
A
Chromatography
B
Wilhelmy plate method
C
Spectroscopy
D
Titration
Question 149Single Answer
Surface free energy is minimum when?
A
Temperature is high
B
Surface area is maximum
C
Surface area is minimum
D
Pressure is high
Question 150Single Answer
Surface active agents mainly contain?
A
Hydrophilic and hydrophobic parts
B
Only hydrophilic part
C
Only hydrophobic part
D
Metallic ions
Question 151Single Answer
Hydrophilic-lipophilic balance (HLB) system is proposed by?
A
Einstein
B
Newton
C
Griffin
D
Stokes
Question 152Single Answer
HLB value of 10-18 is suitable for?
A
Lubricants
B
W/O emulsifiers
C
Antifoaming agents
D
Solubilizers and detergents
Question 153Single Answer
HLB value below 10 generally indicates?
A
Water soluble surfactant
B
Oil soluble surfactant
C
Gas soluble surfactant
D
Solid soluble surfactant
Question 154Single Answer
Detergency mechanism mainly involves?
A
Only dissolution
B
Wetting, emulsification and solubilization
C
Only precipitation
D
Only filtration
Question 155Single Answer
Solubilization in micelles mainly occurs in?
A
Outer surface only
B
Core of micelle
C
Gas phase
D
Solid phase
Question 156Single Answer
Critical micelle concentration (CMC) is?
A
Maximum solubility
B
Minimum concentration for micelle formation
C
Boiling point
D
Freezing point
Question 157Single Answer
Above CMC, surface tension?
A
Becomes zero
B
Increases rapidly
C
Decreases continuously
D
Remains almost constant
Question 158Single Answer
Surface tension of water decreases with addition of?
A
Surfactants
B
Salts only
C
Metals
D
Acids only
Question 159Single Answer
Adsorption at solid-liquid interface is important in?
