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1. Which of the following are the constituents of paint?
- Pigments
- Binders
- Solvents
- All of the above
Answer and Explanation
Answer: (4) All of the above
Explanation: There are majorly four constituents of paint.
-> These are pigments (base), binders, solvents (liquids), and additives.
-> Some common additives are the drier and extenders (cheap alternatives to base pigments).
2. Which of the following is used as the supportive medium for pigments?
- Binder
- Solvent
- Drier
- Extenders
Answer and Explanation
Answer: (1) Binder
Explanation: The binder (sometimes called vehicle) provides the supporting medium for the pigments and additives, and enables a film to be formed when the paint dries.
-> Alkyds and acrylic resins are common binder types.
References: Forensic Analytical Techniques By Barbara H. Stuart. Pg 7. 2012
-> Extenders are generally less expensive inorganic materials that are added to the paint to increase its solid content and, thereby, its opacity and hiding ability
3. The component that holds all the component of paint with surface is called:
- Binder
- Solvent
- Drier
- Extenders
Answer and Explanation
Answer: (1) Binder
Explanation:
-> A binder is usually polymeric, consisting of natural or synthetic resins.
-> Th binder can form a surface film over the surface when the paint dries.
4. When the binder form bond with the surface by the process of evaporation of solvent system of liquid, paint is called
- Enamel
- Lacquer
- Latex
- Both (1) and (2)
Answer and Explanation
Answer: (2) Lacquer
Explanation: Lacquer paints form film by evaporation of their solvents.
-> Can resolublize in organic solvents.
5. Following paint solution forms a film by cross linkaging of their components.
- Enamel
- Lacquer
- Latex
- Both (1) and (3)
Answer and Explanation
Answer: (1) Enamel
6. Forming cross linkage bonds in enamel paints are governed by:
- Temperature
- Oxidation
- Initiators
- All of the above
Answer and Explanation
Answer: (4) All of the above
Explanation: Enamel paints form cross linkage by:
-> elevation of temperature
-> expose to air to cause oxidation
-> special initiators
7. Latex paints use which of the following means to form film?
- Coalescence
- Chemical bonding
- Evaporation
- All of the above
Answer and Explanation
Answer: (1) Coalescence
Explanation:
-> Coalescence: joining of elements to form one mass or whole.
-> Latex paints form films by coalescence of dispersed latex elements when they lose water.
8. Which of the following components is responsible for the “hue” of paint?
- Pigments
- Binders
- Solvents
- All of the above
Answer and Explanation
Answer: (1) Pigments
Explanation: Pigments are responsible for the color, hue and saturation of paint.
9. The term “hue” is associated with which of the following?
- Mineral constituent of the soil
- Base color of the soil
- Texture of the soil
- Organic material present in soil
Answer
Answer: (2) Base color of the soil
10. Pigments of green color paint are obtained as evidence, what is most predominantly the origin of pigment?
- Organic
- Inorganic
- Semi-Synthetic organic inorganic mixture
- 50% organic and 50% inorganic
Answer and Explanation
Answer: (1) Organic
Explanation:
-> Blues and green color are predominantly organic
-> White, yellow and Reds are inorganic
Reference: Forensic Science by Nordby
11. Assertion (A): In common paint applications, pigments are expensive so they are adjusted by adding more solvent to paint without losing its color.
Reason (R): Solvent adds opacity, viscosity and hiding ability of paint.
- (A) is correct, but (R) is incorrect
- Both (A) and (R) are incorrect
- (R) is correct, but (A) is incorrect
- Both (A) and (R) are correct
Answer and Explanation
Answer: (2) Both (A) and (R) are incorrect
Explanation:
-> Correct Assertion: It’s extenders, that is added to adjust color and an inexpensive alternative to pigments. You can also call it a cheap alternative to pigments.
-> Correct Reason: Extenders add opacity, viscosity and hiding ability of paint.
12. Extenders are cheaper than pigments and majorly made up of:
- Organic
- Inorganic
- Semi-Synthetic organic inorganic mixture
- 50% organic and 50% inorganic
Answer and Explanation
Answer: (2) Inorganic
Explanation: Most extenders are generally less expensive and made from inorganic material.
13. _____________ has excellent light scattering properties and is used in paints to provide whiteness and durability.
- Titanium oxide
- Titanium dioxide
- Mixture of Lead and Titanium oxide
- 90% Titanium oxide in 10% Lead sulfate solution per 100 ml
Answer
Answer: (2) Titanium dioxide
14. Enamel acrylic paints are recommended to have a _____________ coat before its application.
- Base coat of TiO2
- Top coat
- Cement coat
- Primer coat
Answer
Answer: (4) Primer coat
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In question number 2 extender is also given which Is used to dilute paint ….
No extenders adds solid content make paint more thicker.