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Q105
(CAPF/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Match List-I with List-II and select the correct answer using the code given below the Lists :
| List-I (Constituent of Paint) | List-II (Example) |
|---|---|
| A. Pigment | 1. Zinc oxide |
| B. Extender | 2. China clay |
| C. Thinner | 3. Naphthenate |
| D. Drier | 4. Turpentine |
Code :
Result
Your answer:
—
·
Correct:
B
Explanation
The constituents of paint serve specific functional roles in its composition:
- Pigments: These provide color and opacity. Zinc oxide is a common white pigment that also provides some resistance to mildew.
- Extenders (Fillers): These are inert materials added to increase the volume of the paint and reduce cost. China clay (Kaolin) is a standard extender that improves the suspension of pigments.
- Thinners (Solvents): These volatile liquids are used to adjust the viscosity for easy application. Turpentine is a traditional solvent used for oil-based paints.
- Driers: These act as catalysts to accelerate the drying and hardening of the paint film. Naphthenates (such as cobalt or manganese naphthenates) are widely used metallic soaps for this purpose.
Matching these roles results in the sequence: A-1, B-2, C-4, D-3.
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