This document contains 25 multiple choice questions about colloids and colloidal systems. It tests knowledge about different types of colloids like solid sols, liquid sols and gaseous sols. It also covers topics like micelle formation, particle size ranges of different dispersions, mechanisms of separation like flocculation, and characteristics of colloids like the Tyndall effect. The answers provided are a, b, c or d for each multiple choice question.

2. 1. Which of the following form of colloids
considered to be the lightest colloid?
a) Liquid sol
b) Solid form
c) Gaseous form
d) None of the above
ANSWER
c) Gaseous form

3. 2. Where do the colloidal solutions find
application in?
a) In milk industries
b) In Chromatic chemical industries
c) In crystallography
d) In textiles
ANSWER
a) In milk industries

4. 3. Which of the following is not a mechanism
for the separation of a physically unstable
suspension of magnesium hydroxide in
water?
a) Hydrolysis
b) Ostwald ripening
c) Flocculation
d) Aggregation
ANSWER
a) Hydrolysis

5. 4. As the concentration increases to the
critical micelle concentration (C.M.C.)
soap particles abruptly collected into
spherical structures called
a) Sphere of ions
b) Micelles
c) Dirt particles
d) Ball
ANSWER
b) Micelles

6. 5. Which one of the following systems has
the smallest sized domains in its
dispersed phase?
a) Microemulsion
b) Nanoemulsion
c) Coarse suspension
d) Coarse emulsion
ANSWER
b) Nanoemulsion

7. 6. When a strong beam of light is passed
through a colloidal sol, a visible cone,
resulting from the scattering of light
by the colloidal particles, is formed.
This is called as …..
a) Faraday- Tyndall effect
b) Colloidal effect
c) Scattering effect
d) Sedimentation effect
ANSWER
a) Faraday- Tyndall effect

8. 7. What is a dispersion medium?
a) It is where the solute particle settles.
b) It is where the primary medium settles
c) It is where the dispersed phase is suspended.
d) It is where the dispersed phase is settles.
ANSWER
c) It is where the dispersed phase is suspended.

9. 8. What is the size of a normal amino acid?
a) 4 to 5 nm
b) 2 to 3 nm
c) 2 to 5 nm
d) 1 to 2 nm
ANSWER
d) 1 to 2 nm

10. 9. What is the particle size of coarse
dispersion?
a) Less than 1 nm
b) Greater than 0.5 micrometer
c) More than 1 nm
d) Less than 0.5 micrometer
ANSWER
b) Greater than 0.5 micrometer

11. 10. What is the size of a normal amino
acid?
a) It is the secondary layer in which the colloidal
particles are dispersed
b) It is the basic colloidal layer
c) It is the secondary layer
d) It is the main layer
ANSWER
a) It is the secondary layer in which the colloidal
particles are dispersed

12. 11. Which of the following form of colloid is
considered to be the strongest colloid?
a) Foam
b) Liquid sol
c) Solid sol
d) Gel
ANSWER
c) Solid sol

13. 12. Which of the following is a characteristic
of a colloid?
a) It forms heterogenous layer
b) It forms turbid layers
c) It forms a homogenous layer
d) It forms 2 layers within a solution
ANSWER
b) It forms turbid layer

14. 13. ___ is the movement of charged
surfaces with corresponding ions and
H2O in the stationary liquid induced by
an external field.
a) Electrophoresis
b) Emulsion
c) Colloidal suspension
d) Sedimentation potential
ANSWER
a) Electrophoresis

15. 14.Systems containing colloidal particles
that interact to an appreciable extent
with the dispersion medium are referred
to as……
a) Hydrophilic colloid
b) Hydrophobic colloid
c) Lyophilic colloid
d) All of the above
ANSWER
c) Lyophilic colloid

16. 15. Which method for the production of
dispersions involves the formation of
particles from materials dissolved in
true solutions?
a) High pressure homogenization
b) Milling
c) Top-down
d) Bottom-up
ANSWER
d) Bottom-up

17. 16. Which one of the following dispersions
does not have liquid continuous phase?
a) Gel
b) Microemulsion
c) Foam
d) Nanosuspension
ANSWER
a) Gel

18. 17. A suspension is formed from uniform
particles of solid, of diameter 10 Mm,
suspended in a solvent. What is the
best description of this system?
a) Monodisperse and coarse
b) Polydisperse and colloidal
c) Monodisperse and colloidal
d) Polydisperse and coarse
ANSWER
a) Monodisperse and coarse

19. 18. Which electric field is generated by
locomotion of the liquid along
stationary charged surface?
a) Sedimentation potential
b) Colloidal suspension
c) Electrophoresis
d) Streaming potential
ANSWER
d) Streaming potential

20. 19. What is the particle size of colloidal
particles?
a) Less than 20 nm
b) 30 to 50 nm
c) 10 to 20 nm
d) More than 20 nm
ANSWER
c) 10 to 20 nm

21. 20. What is the particle size of Colloidal
dispersion?
a) From 1 to 2 micrometer
b) From 1 nm to 0.5 nm
c) From 2 to 4 nm
d) From 1 nm to 0.5 micrometer
ANSWER
d) From 1 nm to 0.5 micrometer

22. 21. Which is the charged field generated
by charged particle moving in a
stationary liquid?
a) Electrophoresis
b) Emulsion
c) Sedimentation potential
d) Colloidal suspension
ANSWER
c) Sedimentation potential

23. 22. What is the particle size of molecular
dispersion?
a) Less than 1 nm
b) More than 1 nm
c) 2 to 4 nm
d) 2 to 5 nm
ANSWER
a) Less than 1 nm

24. 23. ___are characterized by having two
distinct regions of opposing solution
affinities within the same molecule or
ion.
a) Amphiphiles
b) Surface active agents
c) Amphiphiles and surface active agents
d) None of the above
ANSWER
c) Amphiphiles and surface active agents

25. 24. The scattering of light by coarse and
colloidal dispersed systems is known as?
a) Contrast matching
b) Tyndall effect
c) Creaming
d) DLVO theory
ANSWER
b) Tyndall effect

26. 25. Which of the following sequences
correctly describes the change in
domain structure as more oil is added to
a water-in-oil emulsion?
a) Bicontinuous, spherical, cylinder-like
b) Spherical, cylinder-like, bicontinuous
c) Cylinder-like, spherical, bicontinuous
d) Spherical, bicontinuous, cylinder-like
ANSWER
a) Bicontinous, spherical, cylinder-like