Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

PP 2 ( physical pharmaceutics 2 mcqs), Exercises of Physical Chemistry

MIT - World Peace UniversityPhysical Chemistry

few imp pp2 mcqs very helpful in exams ... and do study

Typology: Exercises

2020/2021

Uploaded on 06/18/2021

aryan-mandot
aryan-mandot 🇮🇳

1 document

1 / 31

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Colloidal Dispersion
1. In foams, the dispersed phase and dispersion medium are respectively:
a) Gas and solid
b) Gas and liquid
c) Liquid and gas
d) Solid and gas
2. When a strong beam of light is passed through a colloidal solution, a
visible cone is formed
due to scattering of light, this phenomenon is known as:
a) Brownian motion
b) Tyndal cone effect
c) Colloidal cone effect
d) Streaming motion
3. The effect of the valence of an electrolyte on the double layer repulsive
forces is explained
by:
a) DLVO theory
b) Hofmeister series
c) Schulze hardy rule
d) Donnan membrane effect
4. In a dispersed system the order of particle size is :
a) Solutions <emulsions <suspensions
b) Solutions <colloids <emulsions
c) Colloids <emulsions <suspensions
d) Emulsions<colloids <suspensions
5. Solution of proteins and starch in water are examples of:
a) Lyophilic colloids
b) Lyophobic colloids
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f

Partial preview of the text

Download PP 2 ( physical pharmaceutics 2 mcqs) and more Exercises Physical Chemistry in PDF only on Docsity!

Colloidal Dispersion

  1. In foams, the dispersed phase and dispersion medium are respectively: a) Gas and solid b) Gas and liquid c) Liquid and gas d) Solid and gas
  2. When a strong beam of light is passed through a colloidal solution, a visible cone is formed due to scattering of light, this phenomenon is known as: a) Brownian motion b) Tyndal cone effect c) Colloidal cone effect d) Streaming motion
  3. The effect of the valence of an electrolyte on the double layer repulsive forces is explained by: a) DLVO theory b) Hofmeister series c) Schulze hardy rule d) Donnan membrane effect
  4. In a dispersed system the order of particle size is : a) Solutions <emulsions <suspensions b) Solutions <colloids <emulsions c) Colloids <emulsions <suspensions d) Emulsions<colloids <suspensions
  5. Solution of proteins and starch in water are examples of: a) Lyophilic colloids b) Lyophobic colloids

c) Hydrophilic colloids d) Hydrophobic colloids

  1. The movement of a charged particle through a liquid under the influence of an applied potential difference is known as: a) Zeta potential b) Streaming potential c) Electrophoresis d) Electro-osmosis
  2. The phenomenon of coagulation of particles by the addition of a small amount of hydrophilic or hydrophobic colloid to a hydrophobic colloid of opposite charge, is referred to as: a) Precipitation b) Sensitization c) Coagulation d) Protection
  3. The process of separation of colloidal particles from those of molecular dimension found in true liquid is known as: a) Ultrafiltration b) Dialysis c) Electrophoresis d) Osmosis
  4. Colloidal particles can be seen under: a) Light microscope b) Compound microscope c) Optical microscope d) Ultramicroscope
  1. Which one of the following statement is not true for protective colloids? a) Decrease the Zeta potential b) Help in dispersion of the suspended particles c) Provide a mechanical barrier between the particles d ) Lower the interfacial tension
  2. Gegenion refer to: a) Ions having a charge same as that of the potential determining ions b) Ions having a charge opposite to that of the potential determining ions c) Potential determining ions d) Both (a) and (b)
  3. Brownian movement of particles: a) Assists sedimentation b ) Prevents sedimentation c) Increases sedimentation d) Does not affect sedimentation
  4. Surfactant solutions are termed as association colloids when their concentrations are: a) Less than the critical micelle concentration b) More than the critical micelle concentration c) Insufficient to saturate the bulk phase d) Insufficient to saturate the interface
  5. Hydrosol refers to a system in which the dispersed phase and dispersion medium are respectively a) Water and solid b) Gas and water c) Liquid and gas d) Solid and water
  1. Under ultra microscope, colloidal particles appear as: a) Dark spots against bright background b) Bright spots against dark background c) Fluorescent specks d) Dark rings against bright background 1 In foam, the dispersed phase and continuous medium are....... Respectively (A) Gas and liquid (C) Liquid and Gas (B) Gas and solid (D) Solid and gas
  2. An ..... is a sol in which the dispersed phase and continuous medium both are liquid. (A) Suspension (C) Solution (B) Emulsion (D) Mixture
  3. The..... of colloids are of important since the interaction of the particles with each other and the principle phase is of primary concern. (A) Magnitude (C) Surface (B) Shape (D) Size
  4. Solution of proteins and starch in water is an example of...... (A) Lyophilic colloids (C) Hydrophilic colloids (B) Lyophobic colloids (D) Hydrophobic colloids

(D) Decrease sedimentation Rheology

  1. Rheology is defined as: a) Study of particle size b ) Study of flow properties c) Study of complex formation d) Study of interfacial phenomenon
  2. Unit of viscosity is: a) Dynes/cm b) Dynes/cm c) Dynes.sec/cm d) Poise
  3. Unit of kinematic viscosity is: a) Dynes/cm b) Stoke c) Dynes.sec/cm d) Poise
  4. Liquid paraffin exhibits: a) Plastic flow b) Pseudoplastic flow c) Newtonian flow d) Dilatant flow
  5. Which of the following apparatus can be used for determining the viscosity of Newtonias liquids? a) Du Nouy tensiometer b) Andreason Pippette

c) Falling sphere viscometer d) All of the above

  1. Which of the following apparatus can be used for determining the viscosity of Non newtonian fluids? a) Ostwald viscometer b) Brookefield viscometer c) Falling sphere viscometer d) Ubbelohde viscometer
  2. Viscous oils generally exhibit: a) Dilatant flow b) Plastic flow c) Pseudoplastic flow d) Newtonian flow
  3. Which of the following apparatus can be used for evaluating the viscoelastic properties of Non-newtonian substances? a) Du Nouy tensiometer b) Coulter counter c) Ubbelohde viscometer d) Creep viscometer
  4. Non-newtonion flow can be described with the help of: a) True viscosity b) Apparent viscosity c) Kinematic viscosity d) Shear viscosity
  5. Fluidity is a term associated with Newtonian fluids. An equivalent term for the flow of
  1. Increase in resistance to flow with increased rate of shear is referred to as a) Dilatancy b) Rheopaxy c) Thixotropy d) Antithixotropy
  2. Jellies generally exhibit:* a) Plastic flow b) Dilatant flow c) Pseudoplastic flow d) All of the above
  3. In case of plastic systems, the apparent viscosity below the yield value is: a) Equal b) Higher c) Lower d) Infinite
  4. Unit of Relative viscosity is: a) Poise b) Centipoise c) Dynes.sec/cm? d) It is a dimensionless number
  5. For Newtonian fluids, the slope of a rheogram is:* a) Zero b) - c) I d) 1/
  1. The abosolute viscosity of a material divided by its density at a definite temperature is known as: a) Fluidity b) Mobility c) Kinematic viscosity d) Rheology Multiple Type Questions:
  2. In thixotropy, the down curve is positioned to. (A) Left to up curve (B) Right to up curve (C) Super imposible (D) At origin
  3. As like fluidity, the term used for plastic systems is .. (A) Flexibility (B) Plastic viscosity (C) Mobility (D) Elasticity
  4. The systems that undergo gel to sol transformation are ..... (A) Plastic systems (B) Pseudoplastic systems (C) Elastic systems (D) Dilatant systems
  5. After applying shearing stress, the viscosity is increased in ...... (A) Newtonian systems (C) Plastic systems (B) Pseudoplastic systems (D) Dilatant systems

(C) Viscosity to volume (B) Sample Viscosity to reference viscosity (D) Viscosity to surface area Coarse Dispersion

  1. Dispersions containing dispersed particles of about 1 um to 100 um size are referred to as: a) Coarse dispersions b) Colloidal dispersions c) Flocculated dispersions d) Non-flocculated dispersions
  2. The sedimentation of particles in a suspension can be minimized by: a) Increasing the particle size of the active ingredient b) Decreasing the particle size of the active ingredient c) Increasing the viscosity of the suspension d ) Both (b) and (c)
  3. Cake formation is the characteristic feature of. a) Flocculated suspensions b) Deflocculated suspensions c) Thixotropic suspensions d) Structured suspensions
  4. The ratio of the ultimate height of the sediment to the initial height of the total suspension settling in a cylinder under standard conditions is known a) Degree of emulsification b) Degree of flocculation c) Degree of de-flocculation d) Degree of sedimentation
  5. The rate of sedimentation of a flocculated suspension is: a) High

b) Low c) Intermediate d) Nil

  1. If the zeta potential of a suspension is reduced below a certain value, the attracticas particles leads to: a) De-flocculation b) Flocculation c) Sedimentation d) Precipitation
  2. Density of structured vehicles can be increased by adding: a) Suspending agents b) Emulsifying agents c) Water d) Glycerin
  3. The substance which causes controlled aggregation of particles of the dispersed phase in a suspension is known as: a) Suspending agent b) Wetting agent c) Flocculating agent d) Emulsifying agent
  4. Which are the properties of non-flocculated suspensions? a) The sediment is difficult to redisperse b) The rate of sedimentation of particle is low c) The suspension is elegant d) All of the above
  1. Emulsion is thermodynamically: a) Stable b) Unstable c) Both d) None of the above
  2. According to Stokes law, the creaming of emulsions is indirectly proportional to: a) Density of the dispersed phase b) Gravity c) Particle size of the globules of the dispersed phase d) Viscosity of the medium
  3. Ideal phase volume ratio for stable emulsions is: a) 25: b ) 50. c) 75: d) 33:
  4. Emulsions are thermodynamically unstable systems. The events that are likely to occur sequentially are: a) Flocculation, creaming, breaking and coalescence b) Flocculation, creaming, coalescence and breaking c) Breaking, coalescence, flocculation and creaming d) Coalescence, flocculation, creaming and breaking
  5. Oil in water emulsions usually show creaming in: a) Upward direction b) Downward direction c) First upward and then downward direction

d) First downward and then upward direction

  1. O/w micro emulsion containing hydrophilic surfactants produces: a) Translucent emulsion b) Transparent emulsion c) Milky white emulsion d) Intense white emulsion
  2. For a stable flocculated suspension particles should have .... (A) High inter-particles repulsion (B) High inter- particles attraction (C) Weak inter- particles repulsion (D) Weak inter-particles attraction
  3. For decreasing interfacial tension between solid particles and solvent, one of the following excipients used .. (A) Binder (B) Electrolyte (C) Surfactant (D) Filler
  4. In a flocculated suspension, particles settle..... (A) Rapidly (B) Slowly (C) Do not settle (D) Form a hard cake
  5. Supernatant liquid in deflocculated suspension remains.. (A) Clear (B) Turbid (C) Remains as starting (D) Particle absorb liquid

(D) None of the above

  1. If F is equal to 1, it indicates... (A) Ultimate sediment volume of particles is less than initial volume of the suspension (B) Ultimate sediment volume of particles is equal to initial volume of the suspension (C) Ultimate sediment volume of particles is more than initial volume of the suspension (D) None of the above Micromeritics
  2. Which of the following equipment is used for determining the total surface area of powe a) Coulter counter b) Sorptometer c) Andreason pippette d) Shear box
  3. The type of particle diameter obtained by microscopic method of evaluation is: a) Surface-volume diameter b) Volume-surface diameter c ) Projected diameter d) Stokes diameter
  4. Which of the following equipment of used for determining the particle size distributi pharmaceutical powders: a) Differential scanning calorimeter b) Sorptometer c ) Andreason pippette d) Shear box
  5. The rate of sedimentation of particles is directly proportional to:

a) Particle size b) Particle shape c) Particle colour d) None of the above

  1. The instrument used for measuring particle volume is: a) Coulter counter b) Hempel burette c) Andreason pipette d) Helium densitometer
  2. One of the following apparatus is used to determine the particle size by the gravity sedimenataion method: a) Pycnometer b) Ostwald viscometer c) Andreasen pipette d) Coulter counter
  3. When the cumulative percent frequency is plotted on the probability scale against the logarithm of the particle size, the 50% value on the probability scale gives the following particle diameter: a) Harmonic mean b) Geometric mean c) Arithmetic mean d) Geometric mode
  4. According to the Stokes equation, the sedimentation rate is inversely proportional to: a) Viscosity of the medium b) Diameter of the particle