1. Which macromolecular colloid is commonly used as a plasma substitute in medicine?
A.
Starch
B.
Sodium chloride
C.
Glucose
D.
Calcium carbonate
Correct Answer:
Starch
Explanation:
Starch forms a macromolecular colloidal solution and can be used as a plasma substitute in certain medical applications.
2. Gelatin is used in the pharmaceutical industry mainly because it can form
A.
Protective colloids and gels
B.
Metallic crystals
C.
Ionic gases
D.
Simple salt solutions
Correct Answer:
Protective colloids and gels
Explanation:
Gelatin is a macromolecular substance that forms colloidal solutions and gels, making it useful in pharmaceutical preparations.
3. Which macromolecular colloid is commonly used as a protective colloid in pharmaceutical preparations?
A.
Gelatin
B.
Sodium chloride
C.
Potassium nitrate
D.
Calcium sulfate
Correct Answer:
Gelatin
Explanation:
Gelatin protects dispersed particles from coagulation and is therefore used as a protective colloid in medicines.
4. Starch is used in the food industry mainly as a
A.
Thickening and stabilizing agent
B.
Bleaching agent
C.
Metallic preservative
D.
Strong acid
Correct Answer:
Thickening and stabilizing agent
Explanation:
Starch forms colloidal dispersions that increase viscosity and help stabilize many food products.
5. Macromolecular colloids are useful in making paints because they help to
A.
Stabilize the dispersed particles
B.
Convert paint into a gas
C.
Remove all pigments
D.
Produce metallic salts
Correct Answer:
Stabilize the dispersed particles
Explanation:
Macromolecular substances can act as protective colloids, preventing the particles in paints from settling or coagulating easily.
6. Rubber latex is an example of a colloidal system used in the manufacture of
A.
Rubber products
B.
Glass crystals
C.
Common salt
D.
Mineral acids
Correct Answer:
Rubber products
Explanation:
Natural rubber latex is a colloidal dispersion used as a raw material for manufacturing various rubber articles.
7. Which macromolecular colloid is widely used in the preparation of jellies and desserts?
A.
Gelatin
B.
Copper sulfate
C.
Sodium bicarbonate
D.
Calcium chloride
Correct Answer:
Gelatin
Explanation:
Gelatin forms a gel on cooling and is therefore used in jellies, desserts, and similar food products.
8. Macromolecular colloids are used in cosmetics mainly to provide
A.
Smooth texture and stability
B.
Electrical conduction only
C.
Metallic strength
D.
High acidity
Correct Answer:
Smooth texture and stability
Explanation:
Polymeric and protein colloids help provide suitable texture and maintain the stability of cosmetic formulations.
9. Which substance is used in the textile industry as a sizing material because it forms a macromolecular colloidal film?
A.
Starch
B.
Sodium chloride
C.
Potassium permanganate
D.
Calcium oxide
Correct Answer:
Starch
Explanation:
Starch forms a film on textile fibres and is used as a sizing agent to improve their strength and handling.
10. Macromolecular colloids are used in detergents mainly because they can help
A.
Keep dirt particles dispersed
B.
Turn water into ice
C.
Form metallic coatings
D.
Produce oxygen gas
Correct Answer:
Keep dirt particles dispersed
Explanation:
Macromolecular substances can stabilize dispersed dirt particles in washing solutions, helping prevent their redeposition on fabrics.
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