This set of Food Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Dispersed Systems”.
1. Which are the two types of food imulsion?
a) Oil-in-fat and water-in-oil
b) Water-in-water and oil-in-water
c) Water-in-fat and water-in-oil
d) Oil-in-water and water-in-oil
View Answer
Explanation: There are two types of food imulsion, they are oil-in-water and water-in-oil.
2. Which one is a gas-in-liquid type dispersion system?
a) Fog
b) Aerosol
c) Foam
d) Powder
View Answer
Explanation: A dispersion is a system of discrete particles in a continuous fluid phase. A few foods are homogenous solutions, like cooking oil and some drinks.
3. Which one is a solid-in-liquid type dispersed systems?
a) Suspension
b) Foam
c) Aerosol
d) Gel
View Answer
Explanation: A dispersion is a system of discrete particles in a continuous fluid phase. A few foods are homogenous solutions, like cooking oil and some drinks.
4. What is the particle size of a rough dispersed system?
a) >1
b) <1
c) =1
d) 0
View Answer
Explanation: Heterogeneous fluid containing solid particles that are sufficiently large for sedimentation. Particle size is > 1 mm. Dispersion is made by mechanical agitation (sand in the water).
5. How much is the particle size of a colloid?
a) 1 – 1000 nm
b) 5 – 1500 nm
c) 2 – 500 nm
d) 10 – 1000 nm
View Answer
Explanation: Particle size 1 – 1000 nm. Particles have very large surface area. Homogenous colloidal system – lyophilic dispersion. Heterogenic colloidal system – lyophobic dispersion.
6. Dispersion of passing light is called as ________
a) Brown motion
b) Sedimentation
c) Tyndall effect
d) Lyophilic dispersion
View Answer
Explanation: Particles are visible only by ultramicroscope or electron microscope – Brown motion. Dispersion of passing light is called tyndall effect.
7. When high force of attraction exists between colloidal particles and liquid what type of sol is formed?
a) Lyophilic sol
b) Lyophobic sol
c) Dispersion
d) Sedimentation
View Answer
Explanation: Attraction forces (solvate cover) stabilize lyophilic colloid, defense their clustering to the larger complexes. Cells – contain solution of lyophilic colloids.
8. Which type of colloid particles doesn’t have affinity to the molecules of solvent?
a) Lyophilic sol
b) Lyophobic sol
c) Dispersion
d) Sedimentation
View Answer
Explanation: Lyophobic colloid particles don’t have affinity to the molecules of solvent. Mostly complexes of inorganic particles which do not have affinity to the solvent.
9. Which type of colloid forms an imulsion?
a) Lyophobic colloids
b) Lyophilic colloids
c) Dispersion
d) Sedimentation
View Answer
Explanation: Emulsion is stable colloidal system in which both phases are liquids (water and oil). Miscible liquid form a dispersed solution. Lyophobic colloids form an emulsion.
10. If particles are larger than the particles of a colloidal substance, what type of mixture is it?
a) Suspension
b) Dispersion
c) Foam
d) Sol
View Answer
Explanation: If the particles are larger than 1000 nanometers, it is considered as suspension.
Sanfoundry Global Education & Learning Series – Food Chemistry.
To practice all areas of Food Chemistry, here is complete set of Multiple Choice Questions and Answers.
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